材料科学
格式化
法拉第效率
铋
催化作用
电催化剂
电化学
可逆氢电极
化学工程
选择性
氧化还原
电解
无机化学
多孔性
电极
纳米技术
电解质
化学
有机化学
工作电极
物理化学
复合材料
冶金
工程类
作者
Zhengkun Yu,Si-Qian Wu,Liwei Chen,Yuchen Hao,Xin Su,Zhejiaji Zhu,Wenyan Gao,Bo Wang,Anxiang Yin
标识
DOI:10.1021/acsami.1c16689
摘要
Electrochemical CO2 reduction reaction (CO2RR) yielding value-added chemicals provides a sustainable approach for renewable energy storage and conversion. Bismuth-based catalysts prove to be promising candidates for converting CO2 and water into formate but still suffer from poor selectivity and activity and/or sluggish kinetics. Here, we report that ultrathin porous Bi nanosheets (Bi-PNS) can be prepared through a controlled solvothermal protocol. Compared with smooth Bi nanoparticles (Bi-NPs), the ultrathin, rough, and porous Bi-PNS provide more active sites with higher intrinsic reactivities for CO2RR. Moreover, such high activity further increases the local pH in the vicinity of the catalyst surfaces during electrolysis and thus suppresses the competing hydrogen evolution reaction. As a result, the Bi-PNS exhibit significantly boosted CO2RR properties, showing a Faradaic efficiency of 95% with an effective current density of 45 mA cm-2 for formate evolution at the potential of -1.0 V versus reversible hydrogen electrode.
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