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; Youngku Sohn

doi:10.5757/ASCT.2023.32.2.48

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

Published online March 30, 2023

https://doi.org/10.5757/ASCT.2023.32.2.48

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.

Abstract

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Abstract

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 (C_nH_2n+2, n = 2, 3) to alkenes (C_nH_2n, 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.