期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 8, 期 39, 页码 14668-14673出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c03453
关键词
CO2 reduction reaction; Flow cell; Methane; Local environment; Electrolyte cation; Catalyst thickness; Local pH
资金
- Natural Gas Innovation Fund
- Natural Sciences and Engineering Research Council (NSERC) of Canada
- Natural Resources Canada Clean Growth Program
- Ontario Research Fund -Research Excellence program
The electrochemical reduction of CO2 to methane is a promising method to store intermittent renewable energy. Previous research reporting high methane selectivity has relied on H-cells, and total current densities have therefore resided below 50 mA/cm(2), insufficient for industrial applications. Here, we increase the methane production rate by modifying the system so that it functions efficiently in a flow cell configuration. We investigate the impact of the local environment on methane selectivity in flow cells by tuning the choice of electrolyte cation, catalyst thickness, and local pH. We achieve a methane selectivity of 48% +/- 4% with a partial current density of 120 +/- 10 mA/cm(2), representing a cathodic energy efficiency of 23%. We showcase a stable operation for 14 h.
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