Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 38, Pages 32782-32789Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b10421
Keywords
CO2 electrocatalytic reduction; copper foil; dealloy; nanoporous structure; selectivity; crystalline orientation
Funding
- National Research Foundation (NRF), Prime Minister's Office, Singapore under its Campus for Research Excellence and Technological Enterprise (CREATE) programme
- College of Engineering, Nanyang Technological University, the academic research fund tier 2, Ministry of Education, Singapore [M4020246, ARC10/15]
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Electrochemical reduction of carbon dioxide was carried out on copper foil electrodes modified with nanopores on the surface. Such nanopores modified structure was obtained through an alloying dealloying process. Scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy confirmed the formation of alloy layer and the final nanoporous morphology of such copper electrodes. When used in electrolysis process, the as-prepared nanoporesmodified electrodes can suppress the Faradaic efficiency toward methane to less than 1%, while keeping that of ethylene in a high level of 35% in aqueous 0.1 M KHCO3 solution under -1.3 V (vs reversible hydrogen electrode), thus revealing a remarkable selectivity toward ethylene production. The high yield of ethylene can be ascribed to the exposed specific crystalline orientations.
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