Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 244, Issue -, Pages 320-326Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2018.11.042
Keywords
Tungsten disulfide; Heterostructure; Vertically-arranged; Nanosheets; Hydrogen evolution reaction
Funding
- National Natural Science Foundation of China [61674152]
- Natural Science Foundation of Fujian Province of China [2017J01130]
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In this work, we report a simple bottom-up approach to synthesize seamless tungsten disulfide (WS2)-tungsten (W) heterojunction electrode for efficient hydrogen evolution reaction (HER). Through one step sulfidation of WO3/W, ultra-thin vertically-arranged WS2 flakes with high surface areas and stepped-structure as well as abundant defects can grow on the W substrate. The synthesized WS2/W electrode exhibits outstanding HER activity with an onset overpotential of as small as approximately 30 mV, and an operating potential of only 108 mV for 10 mA/cm(2), which is close to the state-of-the-art transition metal dichalcogenides (TMDs) HER electrocatalyst reported in the literature so far. The abundant exposed edges and defects of WS2 along with excellent electrical contact between WS2 and W substrate contribute to the high HER activity of WS2/W electrode reported in this work.
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