Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 2, Pages 1734-1742Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b16164
Keywords
CO2 reduction; electrocatalyst; silver; preferential orientation; Faradaic efficiency
Funding
- U.S. Department Of Energy (DOE) [DE-SC0010531]
- U.S. Department of Energy (DOE) [DE-SC0010531] Funding Source: U.S. Department of Energy (DOE)
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Selective electrochemical reduction of CO2 is one of the most important processes to study because of its promise to convert this greenhouse gas to value-added chemicals at low cost. In this work, a simple anodization treatment was devised that first oxidizes Ag to Ag2CO3, then uses rapid electrochemical reduction to create preferentially oriented nanoparticles (PONs) of metallic Ag (PON-Ag) with high surface area as well as high activity and very high selectivity for the reduction of CO2 to CO. The PON-Ag catalyst was dominated by (110) and (100) orientation, which allowed PON-Ag to achieve a CO Faradaic efficiency of 96.7% at an operating potential of -0.69 V vs RHE. This performance is not only significantly higher than that of polycrystalline Ag (60% at -0.87 V vs RHE) but also represents one of the best combinations of activity and selectivity achieved to date - all with a very simple, scalable approach to electrode fabrication.
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