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Testing a Silver Nanowire Catalyst for the Selective CO2 Reduction in a Gas Diffusion Electrode Half-cell Setup Enabling High Mass Transport Conditions

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In this work, we discuss the application of a gas diffusion electrode (GDE) setup for benchmarking electrocatalysts for the reductive conversion of CO2 (CO2 RR: CO2 reduction reaction). Applying a silver nanowire (Ag-NW) based catalyst, it is demonstrated that in the GDE setup conditions can be reached, which are relevant for the industrial conversion of CO2 to CO. This reaction is part of the so-called 'Rheticus' process that uses the CO for the subsequent production of butanol and hexanol based on a fermentation approach. In contrast to conventional half-cell measurements using a liquid electrolyte, in the GDE setup CO2 RR current densities comparable to technical cells (>100 mA cm–2) are reached without suffering from mass transport limitations of the CO2 reactant gas. The results are of particular importance for designing CO2 RR catalysts exhibiting high faradaic efficiencies towards CO at technological reaction rates.
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Keywords: CO2 REDUCTION; GAS DIFFUSION ELECTRODE; SILVER NANOWIRE CATALYST

Document Type: Research Article

Affiliations: 1: Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, Bern CH-3012 2: Department of Physical Science, Harold Washington College, City colleges of Chicago, 30 E Lake St, Chicago, IL 60601 USA 3: Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, Bern CH-3012;, Email: [email protected] 4: Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, Bern CH-3012;, Email: [email protected]

Publication date: November 1, 2019

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  • International Journal for Chemistry and Official Membership Journal of the Swiss Chemical Society (SCS) and its Divisions

    CHIMIA, a scientific journal for chemistry in the broadest sense, is published 10 times a year and covers the interests of a wide and diverse readership. Contributions from all fields of chemistry and related areas are considered for publication in the form of Review Articles and Notes. A characteristic feature of CHIMIA are the thematic issues, each devoted to an area of great current significance.

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