Effective ethanol-to-CO_(2) electrocatalysis at iridium-bismuth oxide featuring the impressive negative shifting of the working potential  

作　　者：Ruilin Wei Yue Liu Huazhong Ma Xingyu Ma Yaoyue Yang 

机构地区：[1]Key Laboratory of General Chemistry of the National Ethnic Affairs Commission,School of Chemistry and Environment,Southwest Minzu University,Chengdu 610041,Sichuan,China

出　　处：《Journal of Energy Chemistry》2023年第11期23-31,I0002,共10页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(NSFC,22172121);the Natural Science Foundation of Sichuan Province(NSFSC,2023NSFSC1076);the Young Talent Project of State Ethnic Affairs Commission;the Fundamental Research Funds for the Central Universities(ZYN2023106),Southwest Minzu University。

摘　　要：Since low overpotential for the anodic ethanol oxidation reaction(EOR)can favor the higher output voltage and power of direct ethanol fuel cells(DEFCs),it is critical to design new EOR catalysts with efficient ethanol-to-CO_(2)activity at low applied potentials.Thereby,carbon-supported Ir-Bi_(2)O_(3)(Ir-Bi_(2)O_(3)/C)catalysts with highly dispersive bismuth oxide on the iridium surface are designed and prepared,which can merit splitting the ethanol C–C bond and promoting the oxidation of C1 intermediates at the bifunctional interfaces.The as-obtained Ir-Bi2O3/C catalysts show superior EOR mass activity of up to ca.2250 m A mgIr-1.Moreover,they exhibit the record lowest onset oxidation potentials(0.17–0.22 V vs.RHE)and the peak potential(ca.0.58 V vs.RHE),being 130–300 m V lower than the previous landmark noble metallic catalysts.Furthermore,an apparent C1 pathway faraday efficiency(FEC1)of 28%±5.9%at 0.5 V vs.RHE can be obtained at Ir-Bi_(2)O_(3)/C.This work might provide new insights into the new anodic EOR catalysts for increasing the power of DEFCs.

关 键 词：EOR Low overpotential C1 selectivity IRIDIUM Bismuth oxide 

分 类 号：O643.36[理学—物理化学] TM911.4[理学—化学]