https://scholars.lib.ntu.edu.tw/handle/123456789/616362
標題: | Surface electron accumulation and enhanced hydrogen evolution reaction in MoSe2 basal planes | 作者: | Chang Y.S. Chen C.Y. Ho C.J. Chen H.R. Fu T.Y. Huang Y.T. Du H.Y. Lee K.Y. Chao L.C. Chen L.C. Chen K.H. Chu Y.W. Chen R.S. LI-CHYONG CHEN |
關鍵字: | Angle-resolved photoemission spectroscopy;Hydrogen evolution reaction;Molybdenum diselenide;Scanning tunneling microscopy;Selenium vacancy;Surface electron accumulation | 公開日期: | 2021 | 卷: | 84 | 來源出版物: | Nano Energy | 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. © 2021 Elsevier Ltd |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85102398384&doi=10.1016%2fj.nanoen.2021.105922&partnerID=40&md5=dbb18473c7308f86740cb70414f70799 https://scholars.lib.ntu.edu.tw/handle/123456789/616362 |
ISSN: | 22112855 | DOI: | 10.1016/j.nanoen.2021.105922 | SDG/關鍵字: | Crystal structure;Electronic properties;Molybdenum compounds;Nitrogen plasma;Photoelectron spectroscopy;Plasma applications;Scanning tunneling microscopy;Selenium compounds;Surface defects;Angle resolved photoemission spectroscopy;Basal planes;Basal-planes;Hydrogen evolution reactions;Layered crystals;Molybdenum diselenide;Selenia vacancy;Spontaneous formation;Surface electron accumulation;Synthesised;Electrons |
顯示於: | 凝態科學研究中心 |
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