Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 14, Pages 13205-13213Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b22052
Keywords
two-dimensional nanosheets; few-layer NbS2; electrochemical exfoliation; scalable production; energy-efficient HER
Funding
- National Natural Science Foundation of China [51702284, 21878270, 21805244]
- Zhejiang Provincial Natural Science Foundation of China [LR19B060002]
- Startup Foundation for Hundred Talent Program of Zhejiang University [112100-193820101/001/022]
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Two-dimensional (2D) niobium disulfide (NbS2) materials feature unique physical and chemical properties leading to highly promising energy conversion applications. Herein, we developed a robust synthesis technique consisting of electrochemical exfoliation under alternating currents and subsequent liquid-phase exfoliation to prepare highly uniform few-layer NbS2 nanosheets. The obtained few-layer NbS2 material has a 2D nanosheet structure with an ultrathin thickness of similar to 3nm and a lateral size of similar to 2 mu m. Benefiting from their unique 2D structure and highly exposed active sites, the few-layer NbS2 nanosheets drop-carted on carbon paper exhibited excellent catalytic activity for the hydrogen evolution reaction (HER) in acid with an overpotential of 90 mV at a current density of 10 mA cm(-2) and a low Tafel slope of 83 mV dec(-1), which are superior to those reported for other NbS2-based HER electrocatalysts. Furthermore, few-layer NbS2 nanosheets are effective as bifunctional electrocatalysts for hydrogen production by overall water splitting, where the urea and hydrazine oxidation reactions replace the oxygen evolution reaction.
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