4.8 Article

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

期刊

ACS CATALYSIS
卷 7, 期 8, 页码 5112-5120

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acscatal.7b01416

关键词

CO2 electroreduction; plasma treatment; electrolyte design; halide effect; C-2-C-3 products

资金

  1. Cluster of Excellence RESOLV at RUB - Deutsche Forschungsgemeinschaft [EXC 1069]
  2. German Federal Ministry of Education and Research (Bundesministerium fur Bildung and Forschung, BMBF) [03SF0523C-'CO2EKAT']
  3. U.S. National Science Foundation (NSF-Chemistry) [1213182]
  4. Division Of Chemistry
  5. Direct For Mathematical & Physical Scien [1213182] Funding Source: National Science Foundation

向作者/读者索取更多资源

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 CO2 electroreduction over plasma-oxidized polycrystalline Cu foils. It was observed that halide ions such as I- can induce significant nano structuring 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 C-2-C-3 product selectivity (similar to 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.

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