催化作用
合成气
水溶液
化学工程
材料科学
活动站点
纳米颗粒
纳米技术
化学
有机化学
工程类
作者
Shujin Shen,Cheng Han,Bing Wang,Yiang Du,Kunjie Wang
标识
DOI:10.1016/j.apcatb.2020.119380
摘要
Electroreduction of aqueous CO2 is a sustainable approach to produce tunable syngas, which demands the rational design of dual-active-sites catalysts for individual CO2 reduction reaction (CRR) and hydrogen evolution reaction (HER). Here, the self-supporting [email protected] carbon nanotubes grown on carbon nanofiber ([email protected]) is developed with Ni single atoms (SAs) and nanoparticles (NPs) functioning as CRR and HER sites respectively. Benefiting from the hierarchical nanostructures for effective electron transport and mass diffusion, as well as the high accessibility of dual-active sites, [email protected] catalysts can mediate aqueous CO2 into CO/H2 (2:1) with a 100 % Faraday efficiency and a high current density (25 mA cm−2) at low working potential (-0.8 V). By manipulating the Ni SAs/Ni NPs ratio, the CO/H2 proportion is easily modulated in a wide range from 1:4 to 5:1, independence of the working potential (-0.6 to -0.8 V). Our findings provide fresh insights into the design of dual-active-sites catalysts.
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