Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 2, Pages 496-500Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201708748
Keywords
electrocatalysis; graphitic carbon nitride; hydrogen evolution reaction; molybdenum boride; Schottky junction
Categories
Funding
- National Key Research and Development Program of China [2016YFA0202603]
- National Basic Research Program of China [2013CB934103]
- Programme of Introducing Talents of Discipline to Universities [B17034]
- National Natural Science Foundation of China [51521001, 51671003]
- National Natural Science Fund for Distinguished Young Scholars [51425204]
- Fundamental Research Funds for the Central Universities [WUT: 2016III001, 2017III009]
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing [WUT: 2017-KF-2]
- China Scholarship Council [201606955096]
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Proton adsorption on metallic catalysts is a prerequisite for efficient hydrogen evolution reaction (HER). However, tuning proton adsorption without perturbing metallicity remains a challenge. A Schottky catalyst based on metal-semiconductor junction principles is presented. With metallic MoB, the introduction of n-type semiconductive g-C3N4 induces a vigorous charge transfer across the MoB/g-C3N4 Schottky junction, and increases the local electron density in MoB surface, confirmed by multiple spectroscopic techniques. This Schottky catalyst exhibits a superior HER activity with a low Tafel slope of 46 mV dec(-1) and a high exchange current density of 17 mu A cm(-2), which is far better than that of pristine MoB. First-principle calculations reveal that the Schottky contact dramatically lowers the kinetic barriers of both proton adsorption and reduction coordinates, therefore benefiting surface hydrogen generation.
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