格式化
双金属片
电解质
电催化剂
可逆氢电极
膜
电解
选择性
离子交换
无机化学
电极
离子
交换电流密度
铜
法拉第效率
化学工程
电化学
催化作用
化学
材料科学
工作电极
有机化学
物理化学
生物化学
工程类
塔菲尔方程
作者
Luwei Peng,Yaofeng Wang,Yongxia Wang,Nengneng Xu,Wenshuang Lou,Peixuan Liu,Dongqing Cai,Haitao Huang,Jinli Qiao
标识
DOI:10.1016/j.apcatb.2021.120003
摘要
Tuning the geometric and electronic structure of bimetallic electrocatalyst to facilitate a specific reaction pathway and offer more active sites is a promising avenue for enhancing activity and selectivity of electrocatalytic CO2 reduction reaction (eCO2RR). Owing to formation of Bi-Cu interface through the separated growth of Bi and Cu atoms on defective copper foam, the Bi-Cu bimetallic electrode converts CO2 to formate with an allured Faradaic efficiency (94.37%) and partial current density (27.85 mA cm−2) at -0.91 Vversus reversible hydrogen electrode (RHE). Notably, such electrode with tight moss-like structure delivers the excellent durability under 58 h electrolysis, outperforming most of the current Bi-based catalysts. Moreover, we have experimentally shown that KOH is a better electrolyte than KHCO3 due to the lower solution resistance and more confinement of free CO2 gas, and the alkaline anion-exchange membrane is more ideal than the cation-exchange membrane counterpart, owing to the enhancement of formate selectivity by suppressing the evolution of H2. This study inspires a complete set of concepts for highly converting CO2 to formate that contains the design of effective electrocatalysts, the role of growth substrate, the effect of different electrolytes and membranes.
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