Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 23, Pages 6883-6887Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201803501
Keywords
catholyte-free systems; CO2 reduction; electrocatalysis; electrolytes; formic acid
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Funding
- Korea Institute of Energy Research [B8-2431]
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Electrochemical reduction of carbon dioxide (CO2) into value-added chemicals is a promising strategy to reduce CO2 emission and mitigate climate change. One of the most serious problems in electrocatalytic CO2 reduction (CO2R) is the low solubility of CO2 in an aqueous electrolyte, which significantly limits the cathodic reaction rate. This paper proposes a facile method of catholyte-free electrocatalytic CO2 reduction to avoid the solubility limitation using commercial tin nanoparticles as a cathode catalyst. Interestingly, as the reaction temperature rises from 303 K to 363 K, the partial current density (PCD) of formate improves more than two times with 52.9 mAcm @ 2, despite the decrease in CO2 solubility. Furthermore, a significantly high formate concentration of 41.5 gL @ 1 is obtained as a one-path product at 343Kwith high PCD (51.7 mAcm @ 2) and high Faradaic efficiency (93.3%) via continuous operation in a full flow cell at a low cell voltage of 2.2 V.
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