Inhibiting the “shuttle effect” of soluble polysulfides and improving reaction kinetics are the key factors necessary for further exploration of high-performance Li-S batteries. Herein, an effective interface engine...Inhibiting the “shuttle effect” of soluble polysulfides and improving reaction kinetics are the key factors necessary for further exploration of high-performance Li-S batteries. Herein, an effective interface engineering strategy is reported, wherein nitriding of an Ni-based precursor is controlled to enhance Li-S cell regulation. The resulting in-situ formed NiO-Ni_(3)N heterostructure interface not only has a stronger polysulfide adsorption effect than that of monomeric NiO or Ni_(3)N but also has a faster Li ion diffusion ability than a simple physical mixture. More importantly, this approach couples the respective advantages of NiO and Ni_(3)N to reduce polarization and facilitate electron transfer during polysulfide reactions and synergistically catalyze polysulfide conversion. In addition, ultrafine nanoparticles are thought to effectively improve the use of additive materials. In summary, Li-S batteries based on this NiO-Ni_(3)N heterostructure have the features of long cycle stability, rapid charging-discharging, and good performance under high sulfur loading.展开更多
[Objectives]This study was conducted to clarify the improvement effects of different soil amelioration materials such as lime,green manure and bio-organic fertilizer on acidic tobacco-planting soil.[Methods]The dynami...[Objectives]This study was conducted to clarify the improvement effects of different soil amelioration materials such as lime,green manure and bio-organic fertilizer on acidic tobacco-planting soil.[Methods]The dynamic changes of soil pH,soil nutrients and enzyme activity were studied by applying lime,lime+green fertilizer,and lime+green fertilizer+biological organic fertilizer.[Results]①After the application of amelioration materials,the soil pH and available phosphorus content of tobacco-growing soil showed a stepwise change of first increasing and then decreasing,and became stable at 60 d after tobacco transplanting;the soil organic matter,alkali-hydrolyzable nitrogen and available potassium content showed a gradual change trend of"high-low-high";and the soil invertase and urease activity showed a gradual change trend of"low-high-low".②To 90 d after tobacco transplanting,the application of amelioration materials increased soil pH by 1.29-1.62 units,and increased organic matter content by 15.21%-20.86%,alkali-hydrolyzable nitrogen content by 6.83%-18.17%,available phosphorus content by 54.15%-217.85%,rapidly available potassium content by 11.42%-30.86%,soil invertase activity by 70.09%-18.93%,and soil urease activity by 64.07%-130.47%.③The combination of lime+green manure+alkaline microbial organic fertilizer had the best effect on the improvement of acidic tobacco-growing soil,and the effect of lime+green manure+acid microbial organic fertilizer on acidic soil was the second.[Conclusions]When applying lime,green fertilizer and alkaline bio-organic fertilizer should be applied to achieve sustainable improvement of strongly acidic soil.展开更多
Lithium-sulfur(Li-S)batteries hold the potential to revolutionize energy storage due to the high theoretical capacity and energy density.However,the commercialization process is seriously hindered by the rapid capacit...Lithium-sulfur(Li-S)batteries hold the potential to revolutionize energy storage due to the high theoretical capacity and energy density.However,the commercialization process is seriously hindered by the rapid capacity decay and low utilization of sulfur,caused by the inevitable slow dynamics and the“shuttle effect”.The incorporation of metal-based electrocatalysts into sulfur cathodes shows promise in promoting the conversion of lithium polysulfides(LiPSs),reducing the“shuttle effect”,and enhancing cell kinetics and cycle life.Among these,Fe-based materials,characterized by environmental friendliness,low cost,abundant reserves,and high activity,are extensively used in sulfur cathode modification.This article reviews the advancements of Fe-based materials in enhancing Li-S batteries in recent years.Starting from single/multi-component Fe-based metal compounds and single/bimetallic atoms,the influence of different Fe coordination environments on the conversion mechanism of LiPSs is analyzed.It is hoped that this review and the proposed prospects can further stimulate the development and application of the Fe element in Li-S batteries in the future.展开更多
WO_(3)(H_(2)O)_(0.333)/CdS(WS)nanocomposites are obtained via a rapid microwave hydrothermal method,and they are served as visible light-driven photocatalysts for the H2 generation.By using Pt as the cocatalyst,the WS...WO_(3)(H_(2)O)_(0.333)/CdS(WS)nanocomposites are obtained via a rapid microwave hydrothermal method,and they are served as visible light-driven photocatalysts for the H2 generation.By using Pt as the cocatalyst,the WS nanocomposite with 70 wt.%CdS reaches the H2 evolution rate of 10.32 mmol$g-1$h-1,much quicker than those of WO_(3)(H_(2)O)_(0.333)and CdS.The cycling test reveals the good photocatalytic stability of the WS nanocomposite.The carrier transfer mechanism of WS nanocomposites can be explained by the Z-scheme mechanism.The existence of the Z-scheme heterojunction greatly helps to separate photogenerated carriers and thus improves the photocatalytic activity.The present work provides a rapid synthesis method for preparing Z-scheme heterojunction photocatalysts,and may be helpful for the green production of hydrogen.展开更多
基金financial support of the Youth Project of the Provincial Natural Science Foundation of Anhui(No. 2008085QE267)the Doctoral Research Initiation Foundation of Anhui Normal University (No. 751973)+2 种基金the National Natural Science Foundation of China (No. 51972162)the Fundamental Research Funds for the Central Universities (No. 0213-14380196)the Science and Technology Project of Nanchang (No. 2017-SJSYS-008)。
文摘Inhibiting the “shuttle effect” of soluble polysulfides and improving reaction kinetics are the key factors necessary for further exploration of high-performance Li-S batteries. Herein, an effective interface engineering strategy is reported, wherein nitriding of an Ni-based precursor is controlled to enhance Li-S cell regulation. The resulting in-situ formed NiO-Ni_(3)N heterostructure interface not only has a stronger polysulfide adsorption effect than that of monomeric NiO or Ni_(3)N but also has a faster Li ion diffusion ability than a simple physical mixture. More importantly, this approach couples the respective advantages of NiO and Ni_(3)N to reduce polarization and facilitate electron transfer during polysulfide reactions and synergistically catalyze polysulfide conversion. In addition, ultrafine nanoparticles are thought to effectively improve the use of additive materials. In summary, Li-S batteries based on this NiO-Ni_(3)N heterostructure have the features of long cycle stability, rapid charging-discharging, and good performance under high sulfur loading.
基金Supported by Science and Technology Project of Hunan Tobacco Monopoly Bureau(18-21Aa04).
文摘[Objectives]This study was conducted to clarify the improvement effects of different soil amelioration materials such as lime,green manure and bio-organic fertilizer on acidic tobacco-planting soil.[Methods]The dynamic changes of soil pH,soil nutrients and enzyme activity were studied by applying lime,lime+green fertilizer,and lime+green fertilizer+biological organic fertilizer.[Results]①After the application of amelioration materials,the soil pH and available phosphorus content of tobacco-growing soil showed a stepwise change of first increasing and then decreasing,and became stable at 60 d after tobacco transplanting;the soil organic matter,alkali-hydrolyzable nitrogen and available potassium content showed a gradual change trend of"high-low-high";and the soil invertase and urease activity showed a gradual change trend of"low-high-low".②To 90 d after tobacco transplanting,the application of amelioration materials increased soil pH by 1.29-1.62 units,and increased organic matter content by 15.21%-20.86%,alkali-hydrolyzable nitrogen content by 6.83%-18.17%,available phosphorus content by 54.15%-217.85%,rapidly available potassium content by 11.42%-30.86%,soil invertase activity by 70.09%-18.93%,and soil urease activity by 64.07%-130.47%.③The combination of lime+green manure+alkaline microbial organic fertilizer had the best effect on the improvement of acidic tobacco-growing soil,and the effect of lime+green manure+acid microbial organic fertilizer on acidic soil was the second.[Conclusions]When applying lime,green fertilizer and alkaline bio-organic fertilizer should be applied to achieve sustainable improvement of strongly acidic soil.
基金supported by the National Natural Science Foundation of China(Nos.52207227 and 52202244)Doctoral Research Initiation Foundation of Anhui Normal University(No.751973)+1 种基金the Natural Science Foundation of Jiangsu Province,China(No.BK20220540)the Research Foundation for Advanced Talents of Jiangsu University,China(No.22JDG010).
文摘Lithium-sulfur(Li-S)batteries hold the potential to revolutionize energy storage due to the high theoretical capacity and energy density.However,the commercialization process is seriously hindered by the rapid capacity decay and low utilization of sulfur,caused by the inevitable slow dynamics and the“shuttle effect”.The incorporation of metal-based electrocatalysts into sulfur cathodes shows promise in promoting the conversion of lithium polysulfides(LiPSs),reducing the“shuttle effect”,and enhancing cell kinetics and cycle life.Among these,Fe-based materials,characterized by environmental friendliness,low cost,abundant reserves,and high activity,are extensively used in sulfur cathode modification.This article reviews the advancements of Fe-based materials in enhancing Li-S batteries in recent years.Starting from single/multi-component Fe-based metal compounds and single/bimetallic atoms,the influence of different Fe coordination environments on the conversion mechanism of LiPSs is analyzed.It is hoped that this review and the proposed prospects can further stimulate the development and application of the Fe element in Li-S batteries in the future.
基金the National Natural Science Foundation of China(Grant No.21671007)was gratefully acknowledged.
文摘WO_(3)(H_(2)O)_(0.333)/CdS(WS)nanocomposites are obtained via a rapid microwave hydrothermal method,and they are served as visible light-driven photocatalysts for the H2 generation.By using Pt as the cocatalyst,the WS nanocomposite with 70 wt.%CdS reaches the H2 evolution rate of 10.32 mmol$g-1$h-1,much quicker than those of WO_(3)(H_(2)O)_(0.333)and CdS.The cycling test reveals the good photocatalytic stability of the WS nanocomposite.The carrier transfer mechanism of WS nanocomposites can be explained by the Z-scheme mechanism.The existence of the Z-scheme heterojunction greatly helps to separate photogenerated carriers and thus improves the photocatalytic activity.The present work provides a rapid synthesis method for preparing Z-scheme heterojunction photocatalysts,and may be helpful for the green production of hydrogen.
