摘要
本文采用锡负载多孔扩散电极将CO_2电化学还原为甲酸/甲酸盐,研究催化剂粒径和整平层对CO_2电化学还原性能的影响,并考察了电解液类型、浓度及pH对甲酸产量及电流效率的影响。实验结果表明:采用较小粒径的催化剂且具有整平层的电极可获得较好的CO_2电化学还原性能;KHCO_3溶液较适合作为CO_2电化学还原的电解液;甲酸产量和电流效率随着电解液浓度的增加先升高后降低;采用浓度为0.5mol·L^(-1)、pH为7的KHCO_3溶液时,CO_2电化学还原为甲酸的电流效率最高可达20.7%。
Sn loaded gas diffusion electrodes were used for the electrochemical reduction of CO_2 to produce formic acid or formate.Effects of the particle size of catalyst powder and the microporous layer on the performance of CO_2 electrochemical reduction were investigated.The formic acid production and current efficiency were also discussed under various electrolyte types,concentrations and pH values.The experimental results showed that a better CO_2 electrochemical reduction performance could be obtained using the electrode with a smaller catalyst particle size and a microporous layer.KHCO_3 solution was a suitable electrolyte for CO_2 electrochemical reduction compared with KCl,NaHCO_3 and Na_2SO_4 solutions.Moreover,as the concentration of electrolyte increased,both the formic acid production and current efficiency increased at first and then decreased.The maximum current efficiency of formic acid could reach 20.7%with a KHCO3 solution concentration of 0.5mol·L-（-1） and pH value of 7.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2016年第5期1084-1088,共5页
Journal of Engineering Thermophysics
基金
国家自然科学基金项目(No.51376203)
国家自然科学基金项目(No.51276208)
国家杰出青年科学基金项目(No.51325602)
高等学校博士学科点专项科研基金资助课题(No.20120191110010)
中央高校基本科研业务费(No.CDJZR14145502)
海外及港澳学者合作研究基金(No.51428601)
关键词
CO_2电化学还原
多孔扩散电极
电解液
甲酸
CO_2 electrochemical reduction
gas diffusion electrode
electrolyte
formic acid
