Combining Nanoconfinement in Ag Core/Porous Cu Shell Nanoparticles with Gas Diffusion Electrodes for Improved Electrocatalytic Carbon Dioxide Reduction

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Junqueira, João RC
O'Mara, Peter B
Wilde, Patrick
Dieckhöfer, Stefan
Benedetti, Tania M
Andronescu, Corina
Tilley, Richard D
Gooding, J Justin
Schuhmann, Wolfgang
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2021
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Bimetallic silver-copper electrocatalysts are promising materials for electrochemical CO2 reduction reaction (CO2RR) to fuels and multi-carbon molecules. Here, we combine Ag core/porous Cu shell particles, which entrap reaction intermediates and thus facilitate the formation of C2+ products at low overpotentials, with gas diffusion electrodes (GDE). Mass transport plays a crucial role in the product selectivity in CO2RR. Conventional H-cell configurations suffer from limited CO2 diffusion to the reaction zone, thus decreasing the rate of the CO2RR. In contrast, in the case of GDE-based cells, the CO2RR takes place under enhanced mass transport conditions. Hence, investigation of the Ag core/porous Cu shell particles at the same potentials under different mass transport regimes reveals: (i) a variation of product distribution including C3 products, and (ii) a significant change in the local OH- activity under operation.

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ChemElectroChem

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8

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24

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© 2021 The Authors. ChemElectroChem published by Wiley-VCH GmbH. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Chemical sciences

Electrochemistry

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Junqueira, JRC; O'Mara, PB; Wilde, P; Dieckhöfer, S; Benedetti, TM; Andronescu, C; Tilley, RD; Gooding, JJ; Schuhmann, W, Combining Nanoconfinement in Ag Core/Porous Cu Shell Nanoparticles with Gas Diffusion Electrodes for Improved Electrocatalytic Carbon Dioxide Reduction, ChemElectroChem, 2021, 8 (24), pp. 4848-4853

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