Improved CO2 Electroreduction Performance on Plasma-Activated Cu Catalysts via 
Electrolyte Design: Halide Effect

Gao, Dunfeng; Scholten, Fabian; Roldan Cuenya, Beatriz

doi:10.1021/acscatal.7b01416

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Improved CO₂ Electroreduction Performance on Plasma-Activated Cu Catalysts via Electrolyte Design: Halide Effect

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Roldan Cuenya, Beatriz
Department of Physics, Ruhr-University Bochum;
Interface Science, Fritz Haber Institute, Max Planck Society;

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Citation

Gao, D., Scholten, F., & Roldan Cuenya, B. (2017). Improved CO₂ Electroreduction Performance on Plasma-Activated Cu Catalysts via Electrolyte Design: Halide Effect. ACS Catalysis, 7(8), 5112-5120. doi:10.1021/acscatal.7b01416.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-D6B6-4

Abstract

As a sustainable pathway for energy storage and to close the carbon cycle, CO₂ electroreduction has recently gained significant interest. We report here the role of the electrolyte, in particular of halide ions, on O₂ electroreduction over plasma-oxidized polycrystalline Cu foils. It was observed that halide ions such as I⁻ can induce significant nanostructuring of the oxidized Cu surface, even at open circuit potential, including the formation of Cu crystals with welldefined
shapes. Furthermore, the presence of Cl⁻, Br⁻, and I⁻ was found to lower the overpotential and to increase the CO₂ electroreduction rate on plasma-activated preoxidized Cu
catalyst in the order Cl⁻, Br⁻ < I⁻, without sacrificing their intrinsically high C₂−C₃ product selectivity (∼65% total Faradaic efficiency at −1.0 V vs RHE). This enhancement in catalytic performance is mainly attributed to the specific adsorption of halides with a higher coverage on our oxidized Cu surface during the reaction, which have been previously reported to facilitate the formation and stabilization of the carboxyl (*COOH)
intermediate by partial charge donation from the halide ions to CO₂.