Organic Additive-derived Films on Cu Electrodes Promote Electrochemical CO2 Reduction to C2+ Products Under Strongly Acidic Conditions |
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Authors: | Dr Weixuan Nie Gavin P Heim Nicholas B Watkins Prof Dr Theodor Agapie Prof Dr Jonas C Peters |
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Institution: | Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA-91125 USA |
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Abstract: | Electrochemical CO2 reduction (CO2R) 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 CO2R at low pH. Herein we report an alternative approach to selective CO2R (>70 % Faradaic efficiency for C2+ products, FEC2+) at low pH (pH 2; H3PO4/KH2PO4) 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 H3PO4 (pH≈1) at low K+] (0.1 M), even at low operating current, conditions where HER can otherwise dominate. |
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Keywords: | C−C Coupling from CO2 CO2R at Low pH Carbon Dioxide Reduction Film-Modified Electrodes HER Suppression |
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