Perovskite solar cells （PVSCs） have attracted extensive studies due to their high power conversion efficiency （PCE） with low-cost in both raw material and processes. However, there remain obstacles that hinder the...Perovskite solar cells （PVSCs） have attracted extensive studies due to their high power conversion efficiency （PCE） with low-cost in both raw material and processes. However, there remain obstacles that hinder the way to their commer- cialization. Among many drawbacks in PVSCs, we note the problems brought by the use of noble metal counter electrodes （CEs） such as gold and silver. The costly Au and Ag need high energy-consumption thermal evaporation process which can be made only with expensive evaporation equipment under vacuum. All the factors elevate the threshold of PVSCs＇ commercialization. Carbon material, on the other hand, is a readily available electrode candidate for the application as CE in the PVSCs. In this review, endeavors on PVSCs with low-cost carbon materials will be comprehensively discussed based on different device structures and carbon compositions. We believe that the PVSCs with carbon-based CE hold the promise of commercialization of this new technology.展开更多
The low ionic conductivity of solid-state electrolytes(SSEs)and the inferior interfacial reliability between SSEs and solid-state electrodes are two urgent challenges hindering the application of solid-state sodium ba...The low ionic conductivity of solid-state electrolytes(SSEs)and the inferior interfacial reliability between SSEs and solid-state electrodes are two urgent challenges hindering the application of solid-state sodium batteries(SSSBs).Herein,sodium(Na)super ionic conductor(NASICON)-type SSEs with a nominal composition of Na_(3+2x)Zr_(2-x)MgxSi_(2)PO_(12) were synthesized using a facile two-step solid-state method,among which Na_(3.3)Zr_(1.85)Mg_(0.15)Si_(2)PO_(12)(x=0.15,NZSP-Mg_(0.15))showed the highest ionic conductivity of 3.54mS∙cm^(-1) at 25℃.By means of a thorough investigation,it was verified that the composition of the grain boundary plays a crucial role in determining the total ionic conductivity of NASICON.Furthermore,due to a lack of examination in the literature regarding whether NASICON can provide enough anodic electrochemical stability to enable high-voltage SSSBs,we first adopted a high-voltage Na_(3)(VOPO_(4))2F(NVOPF)cathode to verify its compatibility with the optimized NZSP-Mg_(0.15) SSE.By comparing the electrochemical performance of cells with different configurations(low-voltage cathode vs high-voltage cathode,liquid electrolytes vs SSEs),along with an X-ray photoelectron spectroscopy evaluation of the after-cycled NZSP-Mg_(0.15),it was demonstrated that the NASICON SSEs are not stable enough under high voltage,suggesting the importance of investigating the interface between the NASICON SSEs and high-voltage cathodes.Furthermore,by coating NZSP-Mg_(0.15) NASICON powder onto a polyethylene(PE)separator(PE@NASICON),a 2.42 A∙h non-aqueous Na-ion cell of carbon|PE@NASICON|NaNi_(2/9)Cu_(1/9)Fe_(1/3)Mn_(1/3)O_(2) was found to deliver an excellent cycling performance with an 88%capacity retention after 2000 cycles,thereby demonstrating the high reliability of SSEs with NASICON-coated separator.展开更多
After millions of years of evolution,species in nature have structures and complex elements that are difficult to synthesize artificially.Moreover,these fine structures and compositions are often beneficial to improve...After millions of years of evolution,species in nature have structures and complex elements that are difficult to synthesize artificially.Moreover,these fine structures and compositions are often beneficial to improve the photocatalytic performance.Therefore,various materials with special morphology,pore structure and element composition derived from biomass have emerged and are widely used.This mini review focuses on the preparation of bio-inspired materials and their current status in photocatalytic hydrogen production.Hopefully,this will bring new perspectives to researchers and make them learn more about the advantages of"learning from nature"and pay more attention to the green design of material structures.展开更多
The pursuit of high-brightness solid-state lighting(SSL)stimulates the development of all-inorganic color converters with high robustness.It is required that the fluorescent material is able to cope with the extreme c...The pursuit of high-brightness solid-state lighting(SSL)stimulates the development of all-inorganic color converters with high robustness.It is required that the fluorescent material is able to cope with the extreme condition generated from the irradiation of high-power-density excitation light.As such,in this work,we developed a new composite color converter,i,e.,Y_(3)Al_(5)O_(12):Ce^(3+)phosphor-in-silica glass ceramic(YAG:Ce^(3+)PiSGC).Remarkably,the amorphous SiO_(2)matrix spontaneously transforms into tetragonal SiO_(2)crystallites during co-sintering with crystallization fraction reaching up to>90%(almost full ceramization).The activation energy for crystallization E_(c)and Avrami index n of amorphous silica oxide are 298.5 kJ/mol and 1.71,indicating the diffusion-controlled glass crystallization mechanism.The fabricated prototype high-power phosphor-converted white light-emitting diode(pc-wLED)and phosphor-converted white laser diode(pc-wLD)based on YAG:Ce^(3+)PiSGC show satisfactory photometric/colorimetric parameters.The developed color co nverters have combined merits of environmental protection property,cost-effective manufacturing,good luminescent performance,and easy scalability.This study highlights a new kind of opto-functional composite material and its application as an efficient color converter in high-power solid-state lightings.展开更多
The launch of the big data era puts forward challenges for information preservation technology,both in storage capacity and security.Herein,a brand new optical storage medium,transparent glass ceramic(TGC)embedded wit...The launch of the big data era puts forward challenges for information preservation technology,both in storage capacity and security.Herein,a brand new optical storage medium,transparent glass ceramic(TGC)embedded with photostimulated LiGa5O8:Mn2+nanocrystals,capable of achieving bit-by-bit optical data write-in and read-out in a photon trapping/detrapping mode,is developed.The highly ordered nanostructure enables light–matter interaction with high encoding/decoding resolution and low bit error rate.Importantly,going beyond traditional 2D optical storage,the high transparency of the studied bulk medium makes 3D volumetric optical data storage(ODS)possible,which brings about the merits of expanded storage capacity and improved information security.Demonstration application confirmed the erasable-rewritable 3D storage of binary data and display items in TGC with intensity/wavelength multiplexing.The present work highlights a great leap in photostimulated material for ODS application and hopefully stimulates the development of new multi-dimensional ODS media.展开更多
Polarized upconversion luminescence(UCL)of lanthanide-doped micro/nano-crystals has shown great promise in single-particle tracking and super-resolution bioimaging.However,because of the spectral line broadening and m...Polarized upconversion luminescence(UCL)of lanthanide-doped micro/nano-crystals has shown great promise in single-particle tracking and super-resolution bioimaging.However,because of the spectral line broadening and multiple sites of lanthanide in upconversion particles(UCPs),the crystal-field(CF)polarization components of UCL are usually undistinguishable.Herein,we report the linearly polarized UCL in LiLuF_(4):Yb^(3+)/Er^(3+) single microcrystals with resolvable CF transition lines and a polarization degree up to 0.82.The CF levels and CF transition lines of Er^(3+),as well as their emission polarization anisotropy,are unraveled for the first time through low-temperature and high-resolution photoluminescence(PL)and UCL spectroscopies.By taking advantage of the well-resolved and highly-polarized CF transition lines of Er^(3+),we demonstrate the application of LiLuF_(4):Yb^(3+)/Er^(3+) single microcrystals as anisotropic UCL probes for orientation tracking.These findings provide fundamental insights into the polarization anisotropy of UCL in lanthanide-doped single particles,thus laying a foundation for the future design of anisotropic luminescent probes towards versatile applications.展开更多
Carbon materials are crucially important for the realization of potassium-ion batteries.However,the potassium storage mechanisms in various carbon materials are incompletely understood.Herein,solid-state ^(13)C nuclea...Carbon materials are crucially important for the realization of potassium-ion batteries.However,the potassium storage mechanisms in various carbon materials are incompletely understood.Herein,solid-state ^(13)C nuclear magnetic resonance(NMR) spectroscopy coupled with Raman and X-ray diffraction(XRD) techniques are employed to study the reaction mechanism in a soft carbon quantitatively.It is revealed that the insertion of potassium ions into the soft carbon firstly induces a transformation of the disordered region to short-range ordered stacking,involving both the pristine local unorganized and organized carbon layers.Subsequently,potassium ions intercalate into the rearranged carbon structure,finally producing the nano-sized KC_(8).Moreover,a remarkable c apacity of 322 mAh·g^(-1) with a low mid potassiation voltage of <0.3 V is present for the prepared soft carbon,which is on account of the underlying potassium storage sites,including the disordered stacking carbon as a main component of the soft carbon.These results suggest that regulating the disordered stacking region in the turbostratic structure of soft carbon is a critical issue for further improving the potassium storage performance.展开更多
In this paper,CeO_(2) substrate was prepared by the sol-gel method,further CuO was introduced by adding the copper complexes with chelating agents into the sol-gel precursors of CeO_(2),in which different chelating ag...In this paper,CeO_(2) substrate was prepared by the sol-gel method,further CuO was introduced by adding the copper complexes with chelating agents into the sol-gel precursors of CeO_(2),in which different chelating agents(β-cyclodextrin,glucose and trimesic acid)were tried.This synthesis method helps the CuO species to disperse very uniformly in the CeO_(2) substrates.When the amount of copper oxide is up to33 mol%,the CuO/CeO_(2) samples can still maintain a highly dispersed state.The CeO_(2) and CuO/CeO_(2)samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS),temperature-programmed reduction of hydrogen(H_(2)-TPR),temperature-programed desorption(O_(2)-TPD),etc.It is found that the CuO/CeO_(2) catalyst prepared byβ-cyclodextrin(βCuO/CeO_(2)) exhibits better catalytic performance owing to the higher dispersion,higher specific surface area,more defects,more active Ce3+and Cu^(+) ions,more oxygen vacancies,more surface active oxygen,relatively better low temperature reducibility,and the exposed(110) active facets.In the condition of 1000×10-6toluene in air and WHSV=60000 mL/(g·h),the T90for toluene conversion is 227℃.The reaction mechanism of toluene catalytic oxidation over CeO_(2)andβCuO/CeO_(2) is discussed by the study of in-situ DRIFTS.This work affords a simple and efficient method for the synthesis of highly dispersed bimetal oxide catalysts with high contents.展开更多
The crystal of(24 R)-3β,5α-dihydroxy-24-ethyl-5α-cholestan-6-one(1) was isolated from the leaves of P.nagi planted in Fujian for the first time with the same skeleton as 26,27-dinorcholest-5-en-3-β-ol(2) andβ-sit...The crystal of(24 R)-3β,5α-dihydroxy-24-ethyl-5α-cholestan-6-one(1) was isolated from the leaves of P.nagi planted in Fujian for the first time with the same skeleton as 26,27-dinorcholest-5-en-3-β-ol(2) andβ-sitosterol(3) that have been reported before.Compound 1 crystallizes in monoclinic,space group P2_(1) with a=10.8482(4),b=7.3671(3),c=33.7860(15) A,β=93.103(4)°,V=2696.21(19) A^(3),Z=75,M_(r)=446.70,ρ_(calc)=1.145 g/cm^(3),F(000)=1032,μ=0.572 mm^(-1),GOOF=1.034,the final R=0.0467 and wR=0.1129 for 6989 observed reflections with I> 2σ(Ⅰ).Compound 2 was selected to evaluate for their preliminary in vitro anticancer activity against four cancer cell lines for the first time.The results showed that compound 2 exhibited great inhibition against gastric cancer,breast cancer MCF-7,lung cancer A549 and Helacell lines with the inhibitions of89.16% ± 1.17,97.02%±0.53,47.20%±2.58 and 36.89%±1.22 respectively at the concentration of 1.4×10^(-2) M,which means that we found the new anticancer compound in this plant medicine.展开更多
In this report,a series of self-organized TiO_(2)nanotube arrays were prepared by anodization of titanium foil in mixed electrolytes composed of water,ethylene glycol,and NH_(4)F.Their photoelectrochemical(PEC)perform...In this report,a series of self-organized TiO_(2)nanotube arrays were prepared by anodization of titanium foil in mixed electrolytes composed of water,ethylene glycol,and NH_(4)F.Their photoelectrochemical(PEC)performance as a photoanode was characterized by the PEC water-splitting hydrogen(H_(2))generation reaction.The internal relationship between the TiO_(2)nanotube arrays(TNTAs)morphology and their PECperformance was thoroughly investigated.Our results show that when the etching time is 10 hours,the length of the as-prepared TNTAs is about 20.78μm and the measured photocurrent density is around 1.25 m A·cm^(-2)with applied bias voltage 0.6 V(vs.Ag/Ag Cl)under simulated sunlight irradiation,which is 976 times higher than that of the TiO_(2)substrate without nanotubes architecture(0.00128 m A×cm^(-2)).More interestingly,the results of the IPCEmeasurement show that the band-gap of the as-prepared TNTAs is reduced from 3.20 to 2.83 eV.The corresponding optical response limit is also extended from 400 nm to TiO_(2)nanotube arrays is 510 nm,which indicates that the increasement of the TNTAs PEC performance benefits from the great improvement of its utilization of both the UVand visible light irradiation.展开更多
A new tetranuclear cuprous halide complex,(CuBr)_(4)(PN)_(2)(PN=2-(diphenylphosphaneyl)-6-methoxypyridine),was synthesized and fully characterized.In solid state,this complex exhibits efficient blue emission with a ph...A new tetranuclear cuprous halide complex,(CuBr)_(4)(PN)_(2)(PN=2-(diphenylphosphaneyl)-6-methoxypyridine),was synthesized and fully characterized.In solid state,this complex exhibits efficient blue emission with a photoluminescence quantum yield of 43.3%and a decay time of 19μs at room temperature.The theoretical calculations,combined with the temperature dependence of spectroscopic properties and emission decay behaviors,indicate that the emission in the solid state originates from the ^(1,3)(MLCT+XLCT)excited states,which are in thermal equilibrium with a small energy gap of about 0.1 eV.展开更多
基金Project supported by"Hundred Talents Program"of the Haixi Institute,Chinese Academy of Sciences(Grant No.1017001)"Thousand Talents Program"of China
文摘Perovskite solar cells （PVSCs） have attracted extensive studies due to their high power conversion efficiency （PCE） with low-cost in both raw material and processes. However, there remain obstacles that hinder the way to their commer- cialization. Among many drawbacks in PVSCs, we note the problems brought by the use of noble metal counter electrodes （CEs） such as gold and silver. The costly Au and Ag need high energy-consumption thermal evaporation process which can be made only with expensive evaporation equipment under vacuum. All the factors elevate the threshold of PVSCs＇ commercialization. Carbon material, on the other hand, is a readily available electrode candidate for the application as CE in the PVSCs. In this review, endeavors on PVSCs with low-cost carbon materials will be comprehensively discussed based on different device structures and carbon compositions. We believe that the PVSCs with carbon-based CE hold the promise of commercialization of this new technology.
基金the National Key Technologies Research and Development Program,China(2016YFB0901500)the Opening Project of the Key Laboratory of Optoelectronic Chemical Materials and Devices,Ministry of Education,Jianghan University(JDGD-201703)+2 种基金the National Natural Science Foundation of China(51725206 and 51421002)the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA21070500)the Youth Innovation Promotion Association,Chinese Academy of Sciences(2020006).
文摘The low ionic conductivity of solid-state electrolytes(SSEs)and the inferior interfacial reliability between SSEs and solid-state electrodes are two urgent challenges hindering the application of solid-state sodium batteries(SSSBs).Herein,sodium(Na)super ionic conductor(NASICON)-type SSEs with a nominal composition of Na_(3+2x)Zr_(2-x)MgxSi_(2)PO_(12) were synthesized using a facile two-step solid-state method,among which Na_(3.3)Zr_(1.85)Mg_(0.15)Si_(2)PO_(12)(x=0.15,NZSP-Mg_(0.15))showed the highest ionic conductivity of 3.54mS∙cm^(-1) at 25℃.By means of a thorough investigation,it was verified that the composition of the grain boundary plays a crucial role in determining the total ionic conductivity of NASICON.Furthermore,due to a lack of examination in the literature regarding whether NASICON can provide enough anodic electrochemical stability to enable high-voltage SSSBs,we first adopted a high-voltage Na_(3)(VOPO_(4))2F(NVOPF)cathode to verify its compatibility with the optimized NZSP-Mg_(0.15) SSE.By comparing the electrochemical performance of cells with different configurations(low-voltage cathode vs high-voltage cathode,liquid electrolytes vs SSEs),along with an X-ray photoelectron spectroscopy evaluation of the after-cycled NZSP-Mg_(0.15),it was demonstrated that the NASICON SSEs are not stable enough under high voltage,suggesting the importance of investigating the interface between the NASICON SSEs and high-voltage cathodes.Furthermore,by coating NZSP-Mg_(0.15) NASICON powder onto a polyethylene(PE)separator(PE@NASICON),a 2.42 A∙h non-aqueous Na-ion cell of carbon|PE@NASICON|NaNi_(2/9)Cu_(1/9)Fe_(1/3)Mn_(1/3)O_(2) was found to deliver an excellent cycling performance with an 88%capacity retention after 2000 cycles,thereby demonstrating the high reliability of SSEs with NASICON-coated separator.
基金supported by the National Natural Science Foundation of China(21805280,51672271)the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB20000000)the Key Program of Frontier Science,CAS(QYZDJ-SSW-SLH033)。
文摘After millions of years of evolution,species in nature have structures and complex elements that are difficult to synthesize artificially.Moreover,these fine structures and compositions are often beneficial to improve the photocatalytic performance.Therefore,various materials with special morphology,pore structure and element composition derived from biomass have emerged and are widely used.This mini review focuses on the preparation of bio-inspired materials and their current status in photocatalytic hydrogen production.Hopefully,this will bring new perspectives to researchers and make them learn more about the advantages of"learning from nature"and pay more attention to the green design of material structures.
基金Project supported by the National Natural Science Foundation of China(U2005213,51972303,11974350)Science Fund for Distinguished Young Scholars of Fujian Province(2022J06030)+2 种基金Science Fund of Fujian Province(2022J05091)Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China(2021ZR134)the STS Project of Fujian-CAS(2022T3069)。
文摘The pursuit of high-brightness solid-state lighting(SSL)stimulates the development of all-inorganic color converters with high robustness.It is required that the fluorescent material is able to cope with the extreme condition generated from the irradiation of high-power-density excitation light.As such,in this work,we developed a new composite color converter,i,e.,Y_(3)Al_(5)O_(12):Ce^(3+)phosphor-in-silica glass ceramic(YAG:Ce^(3+)PiSGC).Remarkably,the amorphous SiO_(2)matrix spontaneously transforms into tetragonal SiO_(2)crystallites during co-sintering with crystallization fraction reaching up to>90%(almost full ceramization).The activation energy for crystallization E_(c)and Avrami index n of amorphous silica oxide are 298.5 kJ/mol and 1.71,indicating the diffusion-controlled glass crystallization mechanism.The fabricated prototype high-power phosphor-converted white light-emitting diode(pc-wLED)and phosphor-converted white laser diode(pc-wLD)based on YAG:Ce^(3+)PiSGC show satisfactory photometric/colorimetric parameters.The developed color co nverters have combined merits of environmental protection property,cost-effective manufacturing,good luminescent performance,and easy scalability.This study highlights a new kind of opto-functional composite material and its application as an efficient color converter in high-power solid-state lightings.
基金supported by the National Natural Science Foundation of China(51872288,11774346,51972303 and 11974350)the Natural Science Foundation of Fujian Province(2019J01122).
文摘The launch of the big data era puts forward challenges for information preservation technology,both in storage capacity and security.Herein,a brand new optical storage medium,transparent glass ceramic(TGC)embedded with photostimulated LiGa5O8:Mn2+nanocrystals,capable of achieving bit-by-bit optical data write-in and read-out in a photon trapping/detrapping mode,is developed.The highly ordered nanostructure enables light–matter interaction with high encoding/decoding resolution and low bit error rate.Importantly,going beyond traditional 2D optical storage,the high transparency of the studied bulk medium makes 3D volumetric optical data storage(ODS)possible,which brings about the merits of expanded storage capacity and improved information security.Demonstration application confirmed the erasable-rewritable 3D storage of binary data and display items in TGC with intensity/wavelength multiplexing.The present work highlights a great leap in photostimulated material for ODS application and hopefully stimulates the development of new multi-dimensional ODS media.
基金supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(CAS,XDB20000000)the National Natural Science Foundation of China(U1805252,21875250,11774345,12074379,21771185,12074380,and 21975257)+1 种基金the Youth Innovation Promotion Association of the CAS(2020305)the Natural Science Foundation of Fujian Province(2020I0037).
文摘Polarized upconversion luminescence(UCL)of lanthanide-doped micro/nano-crystals has shown great promise in single-particle tracking and super-resolution bioimaging.However,because of the spectral line broadening and multiple sites of lanthanide in upconversion particles(UCPs),the crystal-field(CF)polarization components of UCL are usually undistinguishable.Herein,we report the linearly polarized UCL in LiLuF_(4):Yb^(3+)/Er^(3+) single microcrystals with resolvable CF transition lines and a polarization degree up to 0.82.The CF levels and CF transition lines of Er^(3+),as well as their emission polarization anisotropy,are unraveled for the first time through low-temperature and high-resolution photoluminescence(PL)and UCL spectroscopies.By taking advantage of the well-resolved and highly-polarized CF transition lines of Er^(3+),we demonstrate the application of LiLuF_(4):Yb^(3+)/Er^(3+) single microcrystals as anisotropic UCL probes for orientation tracking.These findings provide fundamental insights into the polarization anisotropy of UCL in lanthanide-doped single particles,thus laying a foundation for the future design of anisotropic luminescent probes towards versatile applications.
基金financially supported by the National Nature Science Foundation of China (Nos.21905314, 21825202,21733012,92045302 and 21603231)Newton Advanced Fellowships (No.NAF/R2/180603)+1 种基金"Scientist Studio Funding" from Tianmu Lake Institute of Advanced Energy Storage Technologies Co.,Ltdthe Science and Technology Service Network Initiative from Chinese Academy of Science (No.STS 2020T3022)。
文摘Carbon materials are crucially important for the realization of potassium-ion batteries.However,the potassium storage mechanisms in various carbon materials are incompletely understood.Herein,solid-state ^(13)C nuclear magnetic resonance(NMR) spectroscopy coupled with Raman and X-ray diffraction(XRD) techniques are employed to study the reaction mechanism in a soft carbon quantitatively.It is revealed that the insertion of potassium ions into the soft carbon firstly induces a transformation of the disordered region to short-range ordered stacking,involving both the pristine local unorganized and organized carbon layers.Subsequently,potassium ions intercalate into the rearranged carbon structure,finally producing the nano-sized KC_(8).Moreover,a remarkable c apacity of 322 mAh·g^(-1) with a low mid potassiation voltage of <0.3 V is present for the prepared soft carbon,which is on account of the underlying potassium storage sites,including the disordered stacking carbon as a main component of the soft carbon.These results suggest that regulating the disordered stacking region in the turbostratic structure of soft carbon is a critical issue for further improving the potassium storage performance.
基金Project supported by the National Key Research and Development Program of China(2022YFB3504200)the National Natural Science Foundation of China(21501175,2217060219)+1 种基金the Natural Science Foundation of Fujian Province(2022Y0071)the Xiamen Science and Technology Program Project(3502Z20172029,3502Z20203085).
文摘In this paper,CeO_(2) substrate was prepared by the sol-gel method,further CuO was introduced by adding the copper complexes with chelating agents into the sol-gel precursors of CeO_(2),in which different chelating agents(β-cyclodextrin,glucose and trimesic acid)were tried.This synthesis method helps the CuO species to disperse very uniformly in the CeO_(2) substrates.When the amount of copper oxide is up to33 mol%,the CuO/CeO_(2) samples can still maintain a highly dispersed state.The CeO_(2) and CuO/CeO_(2)samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS),temperature-programmed reduction of hydrogen(H_(2)-TPR),temperature-programed desorption(O_(2)-TPD),etc.It is found that the CuO/CeO_(2) catalyst prepared byβ-cyclodextrin(βCuO/CeO_(2)) exhibits better catalytic performance owing to the higher dispersion,higher specific surface area,more defects,more active Ce3+and Cu^(+) ions,more oxygen vacancies,more surface active oxygen,relatively better low temperature reducibility,and the exposed(110) active facets.In the condition of 1000×10-6toluene in air and WHSV=60000 mL/(g·h),the T90for toluene conversion is 227℃.The reaction mechanism of toluene catalytic oxidation over CeO_(2)andβCuO/CeO_(2) is discussed by the study of in-situ DRIFTS.This work affords a simple and efficient method for the synthesis of highly dispersed bimetal oxide catalysts with high contents.
基金financially supported by the National Natural Science Foundation of China(21875252)Self-created Area Project of Major Science Technology Innovation Platform of Xiamen(3502ZCQ20171002)。
文摘The crystal of(24 R)-3β,5α-dihydroxy-24-ethyl-5α-cholestan-6-one(1) was isolated from the leaves of P.nagi planted in Fujian for the first time with the same skeleton as 26,27-dinorcholest-5-en-3-β-ol(2) andβ-sitosterol(3) that have been reported before.Compound 1 crystallizes in monoclinic,space group P2_(1) with a=10.8482(4),b=7.3671(3),c=33.7860(15) A,β=93.103(4)°,V=2696.21(19) A^(3),Z=75,M_(r)=446.70,ρ_(calc)=1.145 g/cm^(3),F(000)=1032,μ=0.572 mm^(-1),GOOF=1.034,the final R=0.0467 and wR=0.1129 for 6989 observed reflections with I> 2σ(Ⅰ).Compound 2 was selected to evaluate for their preliminary in vitro anticancer activity against four cancer cell lines for the first time.The results showed that compound 2 exhibited great inhibition against gastric cancer,breast cancer MCF-7,lung cancer A549 and Helacell lines with the inhibitions of89.16% ± 1.17,97.02%±0.53,47.20%±2.58 and 36.89%±1.22 respectively at the concentration of 1.4×10^(-2) M,which means that we found the new anticancer compound in this plant medicine.
基金supported by the National Natural Science Foundation of China(21805280)Youth Innovation Foundation of Xiamen City(3502Z20206085)+4 种基金Opening Project of PCOSS,Xiamen University(201907)the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB20000000)the Key Program of Frontier Science,CAS(QYZDJ-SSW-SLH033)the Xiamen Science and Technology Program Project(3502Z20203085)the grant from FJIRSM(CXZX-2017-T04)。
文摘In this report,a series of self-organized TiO_(2)nanotube arrays were prepared by anodization of titanium foil in mixed electrolytes composed of water,ethylene glycol,and NH_(4)F.Their photoelectrochemical(PEC)performance as a photoanode was characterized by the PEC water-splitting hydrogen(H_(2))generation reaction.The internal relationship between the TiO_(2)nanotube arrays(TNTAs)morphology and their PECperformance was thoroughly investigated.Our results show that when the etching time is 10 hours,the length of the as-prepared TNTAs is about 20.78μm and the measured photocurrent density is around 1.25 m A·cm^(-2)with applied bias voltage 0.6 V(vs.Ag/Ag Cl)under simulated sunlight irradiation,which is 976 times higher than that of the TiO_(2)substrate without nanotubes architecture(0.00128 m A×cm^(-2)).More interestingly,the results of the IPCEmeasurement show that the band-gap of the as-prepared TNTAs is reduced from 3.20 to 2.83 eV.The corresponding optical response limit is also extended from 400 nm to TiO_(2)nanotube arrays is 510 nm,which indicates that the increasement of the TNTAs PEC performance benefits from the great improvement of its utilization of both the UVand visible light irradiation.
基金supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB20000000)the Key Research Program of Frontier Science,CAS(QYZDJ-SSW-SLH033)+3 种基金the National Natural Science Foundation of China(52073286,21805281,21875252)the Natural Science Foundation of Fujian Province(2006L2005,2019J01125)the Youth Innovation Foundation of Xiamen City(3502Z20206082)the Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China(2021ZR132)。
文摘A new tetranuclear cuprous halide complex,(CuBr)_(4)(PN)_(2)(PN=2-(diphenylphosphaneyl)-6-methoxypyridine),was synthesized and fully characterized.In solid state,this complex exhibits efficient blue emission with a photoluminescence quantum yield of 43.3%and a decay time of 19μs at room temperature.The theoretical calculations,combined with the temperature dependence of spectroscopic properties and emission decay behaviors,indicate that the emission in the solid state originates from the ^(1,3)(MLCT+XLCT)excited states,which are in thermal equilibrium with a small energy gap of about 0.1 eV.
