Microbial electrolysis cells(MECs)present an attractive route for energy-saving hydrogen(H2)production along with treatment of various wastewaters,which can convert organic matter into H2 with the assistance of microb...Microbial electrolysis cells(MECs)present an attractive route for energy-saving hydrogen(H2)production along with treatment of various wastewaters,which can convert organic matter into H2 with the assistance of microbial electrocatalysis.However,the development of such renewable technologies for H2 production still faces considerable challenges regarding how to enhance the H2 production rate and to lower the energy and the system cost.In this review,we will focus on the recent research progress of MEC for H2 production.First,we present a brief introduction of MEC technology and the operating mechanism for H2 production.Then,the electrode materials including some typical electrocatalysts for hydrogen production are summarized and discussed.We also highlight how various substrates used in MEC affect the associated performance of hydrogen generation.Finally we presents several key scientific challenges and our perspectives on how to enhance the electrochemical performance.展开更多
Controlling microbial proliferation in water systems,including wastewater,recreational water,and drinking water,is essential to societal health.Microbial inactivation through electrochemically generated reactive speci...Controlling microbial proliferation in water systems,including wastewater,recreational water,and drinking water,is essential to societal health.Microbial inactivation through electrochemically generated reactive species(RS)mediated pathways provides an effective route toward this microbial control.Herein we provide an overview of recent progress toward electrocatalytic generation of RS and their application in water disinfection,with a focus on the selective production of RS,the microorganism interactions with RS(including both RS mechanisms of action and innate microorganism responses to RS),and practical implementation of electrochemically generated RS for microbial inactivation.The article is concluded with a perspective where the challenges and opportunities of RS‐based electrochemical disinfection of water are highlighted,along with possible future research directions.展开更多
Microbial fuel cells(MFCs)are bio-electrochemical systems that can directly convert the chemical energy contained in an effluent into bioelectricity by the action of microorganisms.The performance of these devices is ...Microbial fuel cells(MFCs)are bio-electrochemical systems that can directly convert the chemical energy contained in an effluent into bioelectricity by the action of microorganisms.The performance of these devices is heavily impacted by the choice of the material that forms the cathode.This work focuses on the assessment of ferroelectric and photocatalytic materials as a new class of non-precious catalysts for MFC cathode construction.A series of cathodes based on mixed oxide solid solution of LiTaO_3with WO_3formulated as Li_(1-x)Ta_(1-x)W_xO_3(x=0,0.10,0.20 and0.25),were prepared and investigated in MFCs.The catalyst phases were synthesized,identified and characterized by DRX,PSD,MET and UV–Vis absorption spectroscopy.The cathodes were tested as photoelectrocatalysts in the presence and in the absence of visible light in devices fed with industrial wastewater.The results revealed that the catalytic activity of the cathodes strongly depends on the ratio of substitution of W^(6+)in the LiTaO_3matrix.The maximum power densities generated by the MFC working with this series of cathodes increased from60.45 mW·m^(-3)for x=0.00(LiTaO_3)to 107.2 mW·m^(-3)for x=0.10,showing that insertion of W^(6+)in the tantalate matrix can improve the photocatalytic activity of this material.Moreover,MFCs operating under optimal conditions were capable of reducing the load of chemical oxygen demand by 79%(COD_(initial)=1030 mg·L^(-1)).展开更多
The preparation of high-value fuels and chemicals through the electrochemical carbon dioxide reduction reaction(CDRR)is of great significance to the virtuous cycle of carbon dioxide.However,due to the high overpotenti...The preparation of high-value fuels and chemicals through the electrochemical carbon dioxide reduction reaction(CDRR)is of great significance to the virtuous cycle of carbon dioxide.However,due to the high overpotential involved in this reaction,high power consumption and high-cost noble-metal-based catalysts are required for driving this process.Herein,the electrochemical CDRR was achieved on biocompatible metal-free nitrogen,phosphorus co-doped carbon-based materials(NP-C)in the microbial fuel cell-microbial electrolysis cell(MFC-MEC)coupling system.As the bioelectrochemistry in MFC supplied power to drive the electrocatalysis in MEC,syngas was spontaneously produced from this coupling system without external energy input.With the NP-C materials as the excellent bifunctional electrocatalyst for the CDRR and oxygen reduction reaction(ORR),the current density of the MEC reached−0.52 mA cm^−2,and the Faradaic efficiencies(FEs)of CO and H2 were 60%and 40%,respectively,at a load resistance of 10Ω.Moreover,the CO/H2 product ratio can be changed by adjusting the load resistance,which will widely meet various demand of syngas usage in further reactions.This study provides a spontaneous and tunable production of syngas in biogas digesters via a electrochemical strategy.展开更多
基金supported by the National Natural Science Foundation of China(No.21566025 and No.21875253)the Natural Science Foundation of Jiangxi Province(No.20152ACB21019 and No.20162BCB23044)。
文摘Microbial electrolysis cells(MECs)present an attractive route for energy-saving hydrogen(H2)production along with treatment of various wastewaters,which can convert organic matter into H2 with the assistance of microbial electrocatalysis.However,the development of such renewable technologies for H2 production still faces considerable challenges regarding how to enhance the H2 production rate and to lower the energy and the system cost.In this review,we will focus on the recent research progress of MEC for H2 production.First,we present a brief introduction of MEC technology and the operating mechanism for H2 production.Then,the electrode materials including some typical electrocatalysts for hydrogen production are summarized and discussed.We also highlight how various substrates used in MEC affect the associated performance of hydrogen generation.Finally we presents several key scientific challenges and our perspectives on how to enhance the electrochemical performance.
文摘Controlling microbial proliferation in water systems,including wastewater,recreational water,and drinking water,is essential to societal health.Microbial inactivation through electrochemically generated reactive species(RS)mediated pathways provides an effective route toward this microbial control.Herein we provide an overview of recent progress toward electrocatalytic generation of RS and their application in water disinfection,with a focus on the selective production of RS,the microorganism interactions with RS(including both RS mechanisms of action and innate microorganism responses to RS),and practical implementation of electrochemically generated RS for microbial inactivation.The article is concluded with a perspective where the challenges and opportunities of RS‐based electrochemical disinfection of water are highlighted,along with possible future research directions.
基金partially supported by the Spanish Ministry of Science and Innovation(MICINN)by the FEDER(Fondo Europeo de Desarrollo Regional),ref.CICYT ENE2011-25188by the Seneca Foundation 18975/JLI/2013 grants
文摘Microbial fuel cells(MFCs)are bio-electrochemical systems that can directly convert the chemical energy contained in an effluent into bioelectricity by the action of microorganisms.The performance of these devices is heavily impacted by the choice of the material that forms the cathode.This work focuses on the assessment of ferroelectric and photocatalytic materials as a new class of non-precious catalysts for MFC cathode construction.A series of cathodes based on mixed oxide solid solution of LiTaO_3with WO_3formulated as Li_(1-x)Ta_(1-x)W_xO_3(x=0,0.10,0.20 and0.25),were prepared and investigated in MFCs.The catalyst phases were synthesized,identified and characterized by DRX,PSD,MET and UV–Vis absorption spectroscopy.The cathodes were tested as photoelectrocatalysts in the presence and in the absence of visible light in devices fed with industrial wastewater.The results revealed that the catalytic activity of the cathodes strongly depends on the ratio of substitution of W^(6+)in the LiTaO_3matrix.The maximum power densities generated by the MFC working with this series of cathodes increased from60.45 mW·m^(-3)for x=0.00(LiTaO_3)to 107.2 mW·m^(-3)for x=0.10,showing that insertion of W^(6+)in the tantalate matrix can improve the photocatalytic activity of this material.Moreover,MFCs operating under optimal conditions were capable of reducing the load of chemical oxygen demand by 79%(COD_(initial)=1030 mg·L^(-1)).
基金the National Natural Science Foundation of China(21872147 and 21805277)the Natural Science Foundation of Fujian Province(2018J05030 and 2019J05152)+2 种基金the Key Research Program of Frontier Sciences,CAS(ZDBS-LYSLH028)DNL Cooperation Fund,CAS(DNL201924)the Strategic Priority Research Program,CAS(XDB20000000)。
文摘The preparation of high-value fuels and chemicals through the electrochemical carbon dioxide reduction reaction(CDRR)is of great significance to the virtuous cycle of carbon dioxide.However,due to the high overpotential involved in this reaction,high power consumption and high-cost noble-metal-based catalysts are required for driving this process.Herein,the electrochemical CDRR was achieved on biocompatible metal-free nitrogen,phosphorus co-doped carbon-based materials(NP-C)in the microbial fuel cell-microbial electrolysis cell(MFC-MEC)coupling system.As the bioelectrochemistry in MFC supplied power to drive the electrocatalysis in MEC,syngas was spontaneously produced from this coupling system without external energy input.With the NP-C materials as the excellent bifunctional electrocatalyst for the CDRR and oxygen reduction reaction(ORR),the current density of the MEC reached−0.52 mA cm^−2,and the Faradaic efficiencies(FEs)of CO and H2 were 60%and 40%,respectively,at a load resistance of 10Ω.Moreover,the CO/H2 product ratio can be changed by adjusting the load resistance,which will widely meet various demand of syngas usage in further reactions.This study provides a spontaneous and tunable production of syngas in biogas digesters via a electrochemical strategy.
