扩散
电化学
化学工程
化学
分析化学(期刊)
电解质
阴极
电流(流体)
氢
作者
Yanfang Song,João R. C. Junqueira,Nivedita Sikdar,Denis Öhl,Stefan Dieckhöfer,Thomas Quast,Sabine Seisel,Justus Masa,Corina Andronescu,Wolfgang Schuhmann
标识
DOI:10.1002/anie.202016898
摘要
Electroreduction of CO2 to multi-carbon products has attracted considerable attention as it provides an avenue to high-density renewable energy storage. However, the selectivity and stability under high current densities are rarely reported. Herein, B-doped Cu (B-Cu) and B-Cu-Zn gas diffusion electrodes (GDE) were developed for highly selective and stable CO2 conversion to C2+ products at industrially relevant current densities. The B-Cu GDE exhibited a high Faradaic efficiency of 79 % for C2+ products formation at a current density of -200 mA cm-2 and a potential of -0.45 V vs. RHE. The long-term stability for C2+ formation was substantially improved by incorporating an optimal amount of Zn. Operando Raman spectra confirm the retained Cu+ species under CO2 reduction conditions and the lower overpotential for *OCO formation upon incorporation of Zn, which lead to the excellent conversion of CO2 to C2+ products on B-Cu-Zn GDEs.
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