One way to increase the adoption of renewable energy technologies is to develop advanced materials that improve the efficiency of photoelectrochemical (PEC) systems. As a two-dimensional semiconductor, MoS2 exhibits strong absorption in the visible light region and high catalytic activity, making it a promising photoelectrode material for PEC applications. Nevertheless, systematic studies aimed at optimizing its properties remain necessary. In this study, the morphology of MoS2 photoelectrodes for PEC applications was controllably engineered by adjusting the deposition time using a metal-organic chemical vapor deposition process. The PEC photocurrent of vertically grown MoS2 nanosheet structures was markedly higher than that of MoS2 nanoparticles. This enhancement is attributed to (i) efficient charge separation within the nanosheet architecture, (ii) improved light absorption, and (iii) an increase in the density of catalytically active sites. In addition, the photocurrent depends on the nanosheet size, with excessively thick nanosheets exhibiting lower performance due to limited photogenerated carrier diffusion lengths. These results provide a systematic photoelectrode design strategy with an optimized morphology for efficient PEC water splitting.

Abstract
1. 서 론
2. 실험 방법
3. 결과 및 고찰
4. 결 론
Acknowledgement
References
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• 김의태(충남대학교 공과대학 신소재공학과) | Eui-Tae Kim (Department of Materials Science & Engineering, Chungnam National University, Daejeon 34134, Republic of Korea) Corresponding author
• 서동범(충남대학교 공과대학 신소재공학과, 한국화학연구원 박막재료연구센터) | Dong-Bum Seo (Department of Materials Science & Engineering, Chungnam National University, Daejeon 34134, Republic of Korea, Thin Film Materials Research Center, Korea Research Institute of Chemical Technology, Daejeon 34114, Republic of Korea)