期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 630, 期 -, 页码 81-90出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.09.145
关键词
ElectrochemicalCO2 reduction; Bismuth; Formate; CO2 adsorption; Electrocatalysis
In this work, a nanocomposite electrocatalyst (Bi NCs@PC) with excellent stability and high formate production rate was synthesized by confining Bi nanoclusters into porous carbons. The catalyst shows potential for application in CO2 electrochemical reduction for formate production.
Electrochemical reduction of CO2 to formate via renewable electricity is a cost-effective route. However, the existing bismuth-based electrocatalysts are in oxide form and involve in-situ reduction to metallic bismuth during CO2 reduction. In this work, we demonstrate a nanocomposite electrocatalyst by confin-ing Bi nanoclusters into porous carbons (Bi NCs@PC). In particular, the Bi NCs show excellent stability that can maintain zero valences during long-term electrocatalysis or after months of storage in the air. The as-synthesized Bi NCs@PC catalyst achieves up to 96 % formate Faradaic efficiency (FE) at-1.15 V versus reversible hydrogen electrode. Notably, the FE only attenuates by 7.3 % after 30 days of storage under ambient conditions. In-situ Raman spectrum identify the key intermediates during formate forma-tion. Moreover, Bi NCs encapsulated in carbon micropores could significantly reduce the formation energy of the intermediate *OCHO by density functional theory.(c) 2022 Elsevier Inc. All rights reserved.
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