Synergistic effects of CuS/TiO2 heterointerfaces: Enhanced cathodic CO2 reduction and anodic CH3OH oxidation for paired electrosynthesis of formate

Jia-Yi Shi; Zhen-Long Wang; Ke-An Wang; Hai-Bin Zhu

doi:10.1016/j.jcis.2023.12.177

Synergistic effects of CuS/TiO₂ heterointerfaces: Enhanced cathodic CO₂ reduction and anodic CH₃OH oxidation for paired electrosynthesis of formate

J Colloid Interface Sci. 2024 Apr:659:248-256. doi: 10.1016/j.jcis.2023.12.177. Epub 2023 Dec 30.

Authors

Jia-Yi Shi¹, Zhen-Long Wang¹, Ke-An Wang¹, Hai-Bin Zhu²

Affiliations

¹ School of Chemistry and Chemical Engineering Southeast University Nanjing 211189 China.
² School of Chemistry and Chemical Engineering Southeast University Nanjing 211189 China. Electronic address: zhuhaibin@seu.edu.cn.

PMID: 38176234
DOI: 10.1016/j.jcis.2023.12.177

Abstract

The electrochemical reduction of carbon dioxide into energy-carrying compounds or value-added chemicals is of great significance for diminishing the greenhouse effect. However, it is still imperative to replace the less-value anodic oxygen evolution reaction (OER) to improve the technical economy. Herein, we firstly reported a bifunctional CuS/TiO₂ catalyst for both anodic methanol oxidation reaction (MOR) and cathodic carbon dioxide reduction (CO₂R). The in-built abundant CuS/TiO₂ heterointerfaces are found to boost the CO₂R and MOR to produce formate. Based on the unique bifunctionality of CuS/TiO₂, a paired electrosynthesis of formate was performed with a total Faradaic efficiency (FE) of about 170 %, in which the cathodic CO₂R achieved a formate FE of about 70 %, and the anodic MOR exhibited an almost 100 % formate FE.

Keywords: Anodic methanol oxidation; CO(2) electroreduction; CuS/TiO(2); Formate; Heterointerface; Paired electrosynthesis.