In:
Journal of Materials Chemistry A, Royal Society of Chemistry (RSC), Vol. 10, No. 13 ( 2022), p. 7082-7089
Abstract:
The electrochemical CO 2 reduction reaction (CO 2 RR) using renewably generated electricity under mild conditions is a promising and sustainable approach to convert CO 2 to value-added chemicals. Cu and Cu alloys are considered to be potential catalysts for CO 2 reduction among numerous catalysts. Unfortunately, the product selectivity and conversion efficiency during the CO 2 RR are severely limited by the unavoidable competitive hydrogen evolution reaction (HER). Here, we developed a facile deposition method based on magnetron co-sputtering to optimize the alloy composition of Cu. As a result, we found that CuAg electrode of Sn addition can effectively inhibit the HER during the CO 2 RR and improve the selectivity of CO, and the FE of CO can reach 93% at −0.85 V. The large lattice distortions and strain effect after Sn addition affect the electronic structure and further result in the downshift of the d-band center, which causes the Gibbs free energy of the formation of *H on the CuAgSn surface to increase dramatically. Although the formation energy barrier of *COOH doesn't decrease after Sn addition, the selectivity of CO is enhanced, owing to the selective suppression of the HER. This work provides an effective way to improve the CO 2 reduction performance of binary alloys by adding a small amount of a third metallic element.
Type of Medium:
Online Resource
ISSN:
2050-7488
,
2050-7496
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2022
detail.hit.zdb_id:
2702232-8
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