法拉第效率
电化学
化学
电极
无机化学
电流密度
碱金属
铜
箔法
钾
分析化学(期刊)
材料科学
有机化学
物理化学
复合材料
物理
量子力学
作者
Weixuan Nie,Gavin P. Heim,Nicholas B. Watkins,Theodor Agapie,Jonas C. Peters
标识
DOI:10.1002/anie.202216102
摘要
Electrochemical CO2 reduction (CO2 R) at low pH is desired for high CO2 utilization; the competing hydrogen evolution reaction (HER) remains a challenge. High alkali cation concentration at a high operating current density has recently been used to promote electrochemical CO2 R at low pH. Herein we report an alternative approach to selective CO2 R (>70 % Faradaic efficiency for C2+ products, FEC2+ ) at low pH (pH 2; H3 PO4 /KH2 PO4 ) and low potassium concentration ([K+ ]=0.1 M) using organic film-modified polycrystalline copper (Modified-Cu). Such an electrode effectively mitigates HER due to attenuated proton transport. Modified-Cu still achieves high FEC2+ (45 % with Cu foil /55 % with Cu GDE) under 1.0 M H3 PO4 (pH≈1) at low [K+ ] (0.1 M), even at low operating current, conditions where HER can otherwise dominate.
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