3 years ago

Schottky Catalysts Boost Hydrogen Evolution: the Case of MoB/g-C3N4 Interface Materials

Liang Zhou, Kangning Zhao, Shaojun Guo, Lyudmila Moskaleva, Fan Lv, Zilan Li, Yong Li, Zechao Zhuang, Zhiquan Lang, Liqiang Mai
Moderate proton adsorption on metallic catalysts is a prerequisite for efficient hydrogen evolution reaction (HER). However, precisely tuning the proton adsorption without perturbing metallicity still remains a formidable challenge. Herein, we fabricate an ingenious Schottky catalyst based on metal-semiconductor junction principles. When selecting metallic MoB as a paradigm, 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, proved 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 μA cm-2, far better than that of pristine MoB. First-principle calculations reveal that Schottky contact dramatically lowers the kinetic barriers of both proton adsorption and reduction coordinates, therefore benefiting the surface hydrogen generation.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201708748

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