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Research Paper

Applied Science and Convergence Technology 2023; 32(2): 48-53

Published online March 30, 2023


Copyright © The Korean Vacuum Society.

Electrochemical CO2 Reduction over a MoS2/Mo Electrode

Seon Young Hwang † , Min Hee Joo† , Ju Young Maeng , Go Eun Park , Seo Young Yang , Choong Kyun Rhee , and Youngku Sohn *

Department of Chemistry, Chungnam National University, Daejeon 34134, Republic of Korea

Correspondence to:youngkusohn@cnu.ac.kr

These authors contributed equally to this work.

Received: December 16, 2022; Revised: March 2, 2023; Accepted: March 8, 2023

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License(http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.


Molybdenum disulfide (MoS2) is a promising material for energy and environmental applications. In this paper, we report the direct hydrothermal growth of MoS2 on a Mo support and its application in the rarely explored electrochemical CO2 reduction (EC CO2R) process. To investigate the effects of metal overlayers and the MoS2 support, Au, Ag, and Cu were sputter-deposited on a MoS2 electrode. Large amounts of CH4, C2−3 hydrocarbons, and formate were produced via EC CO2R on bare MoS2. The introduction of a Au overlayer on MoS2 enhanced the production of CO, methanol, and formate. Furthermore, the alkanes (CnH2n+2, n = 2, 3) to alkenes (CnH2n, n = 2, 3) ratio was dependent on the applied potential and overlayer metals. Notably, photoirradiation remarkably increased the CO and C2H4 concentrations by 28-fold and 10-fold, respectively. These findings provide valuable insights for the development of MoS2-based materials for CO2 recycling.

Keywords: Molybdenum disulfide, Electrochemical CO2 reduction, Photoirradiation, Formate, CO hydrocarbons

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