电化学2018，Vol.24Issue(6)：757-765,9.DOI:10.13208/j.electrochem.180845
Pd/C催化剂用于CO2电化学还原生成CO∶Pd载量的影响
Pd/C Catalysts for CO2 Electroreduction to CO∶Pd Loading Effect
摘要
Abstract
Nanostructured heterogeneous catalysts have been widely used in the electrochemical carbon dioxide (CO2) reduction reaction (CO2RR),which can simultaneously achieve the electrocatalytic conversion of CO2 to fuels and the storage of renewable energy sources.Carbon supported palladium nanoparticles (Pd/C) catalysts have been previously reported to show excellent CO2RR performance.However,the crucial role of the metal loading in supported electrocatalysts has been rarely reported.In this work,we study the Pd loading effect on the structure of Pd/C catalysts as well as their activity and selectivity of CO2RR to CO.The Pd loadings in Pd/C catalysts were well controlled by an effective liquid synthesis method.The Pd nanoparticles were homogeneously dispersed on the carbon support,and the Pd loading played a minor role in the particle size.The as-prepared Pd/C catalysts were studied in an optimized electrolyte,0.1 mmol· L-1 KHCO3.It shows a volcano relationship between CO Faradaic efficiency (FE) and the Pd loading,with the highest CO FE of 91.2％ over the 20wt％ Pd/C catalyst at-0.89 V versus the reversible hydrogen electrode (vs.RHE).The geometric CO partial current density had a positive correlation with the Pd loading,while the highest turnover frequency for CO production was observed over the 2.5wt％ Pd/C catalyst (～ 918 h-1 at-0.89 V vs.RHE).The Pd loading effects on the activity and selectivity of CO2RR to CO could be attributed to the number of active sites,reaction kinetics,and the stabilization of key intermediates,as well as the mass transport of reactants,intermediates and products.This work provides new insight into the loading effect,an important reactivity descriptor determining the CO2RR performance.关键词
CO2电化学还原/Pd/C催化剂/载量/电解质/选择性Key words
electrochemical carbon dioxide reduction reaction/Pd/C catalysts/loading/electrolyte/selectivity分类
化学化工引用本文复制引用
高敦峰,阎程程,汪国雄,包信和..Pd/C催化剂用于CO2电化学还原生成CO∶Pd载量的影响[J].电化学,2018,24(6):757-765,9.基金项目
We gratefully acknowledge financial support from the Ministry of Science and Technology of China (Grant 2017YFA0700102),the National Natural Science Foundation of China (Grants 21573222 and 91545202),Outstanding Youth Talent Project of Dalian (2017RJ03),Dalian Institute of Chemical Physics (Grant DICP DMTO201702),the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No.XDB17020200).G.X.Wang thanks the financial support from CAS Youth Innovation Promotion (Grant No.2015145). （Grant 2017YFA0700102）
