Electrocatalytic carbon dioxide reduction reaction(CO_(2) RR)is a promising method to solve current environment and energy issues.Copper-based catalysts have been widely studied for converting CO_(2) into value-added ...Electrocatalytic carbon dioxide reduction reaction(CO_(2) RR)is a promising method to solve current environment and energy issues.Copper-based catalysts have been widely studied for converting CO_(2) into value-added hy-drocarbon products.Cu monometallic catalyst has been proved to have some shortcomings,including relatively high energy barriers and diverse reaction pathways,leading to low reaction activities and poor product selec-tivity,respectively.Recently copper-based bimetallic tandem catalysts have attracted extensive attentions due to their special catalyst structure,which can be easily regulated to achieve high CO_(2) RR reactivity and product selectivity.With the development of quantum chemistry calculations and spectroscopic characterization methods,deep understandings of CO_(2) RR from the mechanism perspective provide a broad horizon for the design of effi-cient catalysts.This review offers a good summary of reaction mechanisms and product regulation strategies over copper-based bimetallic catalysts,along with a brief discussion on future directions towards their practical applications.展开更多
As an energy-intensive industry,the chlor-alkali process has caused numerous environmental issues due to heavy electricity consumption and pollution.Chlor-alkali industry has been upgraded from mercury,diaphragm elect...As an energy-intensive industry,the chlor-alkali process has caused numerous environmental issues due to heavy electricity consumption and pollution.Chlor-alkali industry has been upgraded from mercury,diaphragm electrolytic cell,to ion exchange membrane(IEM)electrolytic cells.However,several challenges,such as the selectivity of the anodic reaction,sluggish kinetics of alkaline hydrogen evolution,degradation of membranes,the reasonable design of electrolytic cell structure,remain to be addressed.For these reasons,this paper mainly reviews the research progress of the chlor-alkali industry from materials to devices,including hydrogen evolution anode,chlorine evolution cathode,IEM,and electrolytic cell system.Finally,the research directions and prospects in the chlor-alkali industry are proposed for its further improvement.展开更多
CO_(2)electroreduction reaction(CO_(2)RR)has been considered as an effective technology to close the anthropogenic carbon cycle.Formate,a product of two-electron transfer in CO_(2)RR,is an economically valuable feedst...CO_(2)electroreduction reaction(CO_(2)RR)has been considered as an effective technology to close the anthropogenic carbon cycle.Formate,a product of two-electron transfer in CO_(2)RR,is an economically valuable feedstock.In this work,nanoporous tin oxides were controllable synthesized by a facile and scalable electrochemical anodic oxidation method.XPS result indicated that the increased Sn 4þspecies after anodic oxidation were beneficial to reduce the overpotential of formate formation.Operando Raman spectra revealed that the enhanced formate selectivity could be attributed to the high local pH within the porous structure,which suppresses hydrogen evolution reaction(competing reaction against CO_(2)RR).Further flow cell test showed a formate partial current density of 285 mA cm^(-2)with the selectivity of 96.4%,indicating a promising industrial application prospect.展开更多
基金financial support from National Na-ture Science Foundation of China(Nos.22078232 and 21938008)the Science and Technology Major Project of Tianjin(Nos.19ZXNCGX00030 and 20JCYBJC00870)Seed Foundation of Tianjin University(2022XJS-0051).
文摘Electrocatalytic carbon dioxide reduction reaction(CO_(2) RR)is a promising method to solve current environment and energy issues.Copper-based catalysts have been widely studied for converting CO_(2) into value-added hy-drocarbon products.Cu monometallic catalyst has been proved to have some shortcomings,including relatively high energy barriers and diverse reaction pathways,leading to low reaction activities and poor product selec-tivity,respectively.Recently copper-based bimetallic tandem catalysts have attracted extensive attentions due to their special catalyst structure,which can be easily regulated to achieve high CO_(2) RR reactivity and product selectivity.With the development of quantum chemistry calculations and spectroscopic characterization methods,deep understandings of CO_(2) RR from the mechanism perspective provide a broad horizon for the design of effi-cient catalysts.This review offers a good summary of reaction mechanisms and product regulation strategies over copper-based bimetallic catalysts,along with a brief discussion on future directions towards their practical applications.
基金The work was supported by the National Nature Science Foundation of China(Nos.2193800 and 22078232)the Science and Technology Major Project of Tianjin(Nos.18ZXJMTG00180 and 19ZXNCGX00030).
文摘As an energy-intensive industry,the chlor-alkali process has caused numerous environmental issues due to heavy electricity consumption and pollution.Chlor-alkali industry has been upgraded from mercury,diaphragm electrolytic cell,to ion exchange membrane(IEM)electrolytic cells.However,several challenges,such as the selectivity of the anodic reaction,sluggish kinetics of alkaline hydrogen evolution,degradation of membranes,the reasonable design of electrolytic cell structure,remain to be addressed.For these reasons,this paper mainly reviews the research progress of the chlor-alkali industry from materials to devices,including hydrogen evolution anode,chlorine evolution cathode,IEM,and electrolytic cell system.Finally,the research directions and prospects in the chlor-alkali industry are proposed for its further improvement.
基金The authors are grateful to the financial support from the Science and Technology Major Project of Tianjin(Grant Nos.19ZXNCGX00030 and 20JCYBJC00870)National Natural Science Foundation of China(Grant Nos.21938008 and 22078232).
文摘CO_(2)electroreduction reaction(CO_(2)RR)has been considered as an effective technology to close the anthropogenic carbon cycle.Formate,a product of two-electron transfer in CO_(2)RR,is an economically valuable feedstock.In this work,nanoporous tin oxides were controllable synthesized by a facile and scalable electrochemical anodic oxidation method.XPS result indicated that the increased Sn 4þspecies after anodic oxidation were beneficial to reduce the overpotential of formate formation.Operando Raman spectra revealed that the enhanced formate selectivity could be attributed to the high local pH within the porous structure,which suppresses hydrogen evolution reaction(competing reaction against CO_(2)RR).Further flow cell test showed a formate partial current density of 285 mA cm^(-2)with the selectivity of 96.4%,indicating a promising industrial application prospect.
