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Enhancement of the electrochemical reduction of CO2 to methanol and suppression of H2 evolution over CuO nanowires

Abstract: A highly efficient copper-catalyst (noble-metal free) was developed for the electrochemical reduction of CO2 (ERCO2) to methanol. Due to the nanowire structure of the catalyst, a remarkable ERCO2 selectivity was achieved, while the competing H2 evolution reaction (HER) was significantly suppressed for the overall range of potential tested. The developed copper-catalyst (CuO NWs) outperforms the single metal Cu-catalysts in aqueous environment. Under atmospheric conditions, methanol was produced at an overpotential of 410 mV with a faradaic efficiency (FE) of 66%, and 1.27 × 10?4 mol m?2 s?1 of production yield; which represents a 6.7% improvement over the previously reported value of 1.19 × 10-4 mol m-2 s-1. Interestingly, when the developed CuO NWs was used as a gas diffusion electrode (GDE) in a filter-press cell (more real industrial configuration), methanol remained as the major ERCO2 product with the same FE (66%).

 Autoría: Azenha C., Mateos-Pedrero C., Alvarez-Guerra M., Irabien A., Mendes A.,

 Fuente: Electrochimica Acta, 2020, 363, 137207

Editorial: Elsevier

 Fecha de publicación: 10/12/2020

Nº de páginas: 40

Tipo de publicación: Artículo de Revista

DOI: 10.1016/j.electacta.2020.137207

ISSN: 0013-4686,1873-3859

Url de la publicación: https://doi.org/10.1016/j.electacta.2020.137207

Autores/as

AZENHA, CÁTIA

MATEOS PEDRERO, CECILIA

MENDES, ADÉLIO