期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 26, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202101668
关键词
carbon dioxide reduction; copper‐ silver; core‐ shell nanoparticles; electrocatalyst; ethylene
类别
资金
- International Institute of Carbon-Neutral Energy Research (WPI-I2CNER) - Japanese Ministry for Education, Culture, Sports, Science, and Technology
- 3M
- SURGE Fellowship from the University of Illinois
- Stein Fellowship
Copper catalysts are widely studied for the electroreduction of CO2 to hydrocarbon products, with this study presenting the synthesis and catalytic study of silver-coated copper nanoparticles. The optimized Cu@Ag electrocatalyst showed a low onset potential for ethylene formation and a high FE towards C2+ products, demonstrating potential for efficient CO2 electroreduction.
Copper catalysts are widely studied for the electroreduction of carbon dioxide (CO2) to value-added hydrocarbon products. Controlling the surface composition of copper nanomaterials may provide the electronic and structural properties necessary for carbon-carbon coupling, thus increasing the Faradaic efficiency (FE) towards ethylene and other multi-carbon (C2+) products. Synthesis and catalytic study of silver-coated copper nanoparticles (Cu@Ag NPs) for the reduction of CO2 are presented. Bimetallic CuAg NPs are typically difficult to produce due to the bulk immiscibility between these two metals. Slow injection of the silver precursor, concentrations of organic capping agents, and gas environment proved critical to control the size and metal distribution of the Cu@Ag NPs. The optimized Cu@Ag electrocatalyst exhibited a very low onset cell potential of -2.25 V for ethylene formation, reaching a FE towards C2+ products (FEC2+) of 43% at -2.50 V, which is 1.0 V lower than a reference Cu catalyst to reach a similar FEC2+. The high ethylene formation at low potentials is attributed to enhanced C-C coupling on the Ag enriched shell of the Cu@Ag electrocatalysts. This study offers a new catalyst design towards increasing the efficiency for the electroreduction of CO2 to value-added chemicals.
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