Monitoring Transformations of Catalytic Active States in Photocathodes Based on MoSx Layers on CuInS2 Using In Operando Raman Spectroscopy

Sang Youn Chae; Noyoung Yoon; Oh Shim Joo; Eun Duck Park

doi:10.1002/anie.202215227

Monitoring Transformations of Catalytic Active States in Photocathodes Based on MoS_x Layers on CuInS₂ Using In Operando Raman Spectroscopy

Angew Chem Int Ed Engl. 2023 Feb 6;62(7):e202215227. doi: 10.1002/anie.202215227. Epub 2023 Jan 12.

Authors

Sang Youn Chae^{1

2}, Noyoung Yoon^{3

4}, Oh Shim Joo³, Eun Duck Park^{1

5}

Affiliations

¹ Department of Energy Systems Research, Ajou University, 16499, Suwon, Republic of Korea.
² Institute of NT-IT Fusion Technology, Ajou University, 16499, Suwon, Republic of Korea.
³ Clean Energy Research Center, Korea Institute of Science and Technology, 02792, Seoul, Republic of Korea.
⁴ Department of Chemical and Biomolecular Engineering, Yonsei University, 03722, Seoul, Republic of Korea.
⁵ Department of Chemical Engineering, Ajou University, 16499, Suwon, Republic of Korea.

PMID: 36542061
DOI: 10.1002/anie.202215227

Abstract

The electrochemical activation of CuInS₂ /MoS_x for photoelectrochemical (PEC) H₂ production was revealed for the first time through in operando Raman spectroscopy. During the activation process, the initial metallic MoS_x phase was transformed to semiconducting MoS_x , which facilitates charge carrier transfer between CuInS₂ and MoS_x . Ex situ X-ray photoelectron spectroscopy and Raman spectroscopy suggest the existence of MoO₃ after the activation process. However, apart from contradicting these results, in operando Raman spectroscopy revealed some of the intermediate steps of the activation process.

Keywords: CuInS2; H2 Evolution; Mosx; Photoelectrochemical Cell; in Operando Raman Spectroscopy.

Abstract

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