Surface electron accumulation and enhanced hydrogen evolution reaction in MoSe2 basal planes

Y. S. Chang, C. Y. Chen, C. J. Ho, C. M. Cheng, H. R. Chen, T. Y. Fu, Y. T. Huang, S. W. Ke, H. Y. Du, K. Y. Lee, L. C. Chao, L. C. Chen, K. H. Chen, Y. W. Chu, R. S. Chen*

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

摘要

The spontaneous formation of surface electron accumulation (SEA) was observed in synthesized molybdenum diselenide (MoSe2) layered crystals with two-hexagonal (2 H) structure. An anomalously high electron concentration at the surface up to 1019 cm−3 is several orders of magnitude higher than that (3.6 × 1012 cm−3) of the inner bulk. The SEA is found to be generated easily by mechanical exfoliation and room temperature deselenization. Se-vacancies have been confirmed to be the major source resulting in SEA and n-type conductivity, and also the active sites for electrochemical catalysis in MoSe2. Noted that the SEA conjugated with the Se-vacancy-related surface defects enhances the electrochemical hydrogen evolution reaction (HER) activity substantially. The optimized HER efficiency with an overpotential at 0.17 V and Tafel slope at 60 mV/dec of the basal plane of 2 H-MoSe2 was achieved by the nitrogen plasma treatment, which has outperformed several nanostructures, thin films, and hybrid counterparts. This study reveals the intriguing surface-dominant electronic property and its effect on the HER enhancement of the basal plane, which is crucial for development of a stable, low-cost and highly efficient catalyst using 2 H-MoSe2.

原文英語
文章編號105922
期刊Nano Energy
84
DOIs
出版狀態已發佈 - 2021 六月

ASJC Scopus subject areas

  • 可再生能源、永續發展與環境
  • 材料科學(全部)
  • 電氣與電子工程

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