Issue 5, 2022

Heterostructured Bi–Cu2S nanocrystals for efficient CO2 electroreduction to formate

Abstract

The electrochemical CO2 reduction reaction (ECO2RR) driven by renewable electricity holds promise to store intermittent energy in chemical bonds, while producing value-added chemicals and fuels sustainably. Unfortunately, it remains a grand challenge to simultaneously achieve a high faradaic efficiency (FE), a low overpotential, and a high current density of the ECO2RR. Herein, we report the synthesis of heterostructured Bi–Cu2S nanocrystals via a one-pot solution-phase method. The epitaxial growth of Cu2S on Bi leads to abundant interfacial sites and the resultant heterostructured Bi–Cu2S nanocrystals enable highly efficient ECO2RR with a largely reduced overpotential (240 mV lower than that of Bi), a near-unity FE (>98%) for formate production, and a high partial current density (2.4- and 5.2-fold higher JHCOO than Cu2S and Bi at −1.0 V vs. reversible hydrogen electrode, RHE). Density functional theory (DFT) calculations show that the electron transfer from Bi to Cu2S at the interface leads to the preferential stabilization of the formate-evolution intermediate (*OCHO).

Graphical abstract: Heterostructured Bi–Cu2S nanocrystals for efficient CO2 electroreduction to formate

Supplementary files

Article information

Article type
Communication
Submitted
17 Dez 2021
Accepted
14 Feb 2022
First published
15 Feb 2022

Nanoscale Horiz., 2022,7, 508-514

Author version available

Heterostructured Bi–Cu2S nanocrystals for efficient CO2 electroreduction to formate

X. Han, T. Mou, S. Liu, M. Ji, Q. Gao, Q. He, H. Xin and H. Zhu, Nanoscale Horiz., 2022, 7, 508 DOI: 10.1039/D1NH00661D

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