Journal
NANO ENERGY
Volume 32, Issue -, Pages 470-478Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2017.01.011
Keywords
Hydrogen evolution reaction; Hybrid; Co9S8@MoSx; Electrocatalyst; Symmetric synergy
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Funding
- National Natural Science Foundation of China [51472164]
- Natural Science Foundation of SZU [000050]
- 1000 Talents Program for Young Scientists of China
- Educational Commission of Guangdong Province [2015KGJHZ006]
- Science and Technology Planning Project of Guangdong Province [2016B050501005]
- China Postdoctoral Science Foundation [2016M592538]
- King Abdullah University of Science and Technology (KAUST), Saudi Arabia
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There exists a strong demand to replace expensive noble metal catalysts with efficient and earth-abundant catalysts for hydrogen evolution reaction (HER). Recently the Co-and Mo-based sulfides such as CoS2, Co9S8, and MoSx have been considered as several promising HER candidates. Here, a highly active and stable hybrid electrocatalyst 3D flower-like hierarchical Co9S8 nanosheets incorporated with MoSx has been developed via a one-step sulfurization method. Since the amounts of Co9S8 and MoSx are easily adjustable, we verify that small amounts of MoSx promotes the HER activity of Co9S8, and vise versa. In other words, we validate that symmetric synergy for HER in the Co- and Mo-based sulfide hybrid catalysts, a long-standing question requiring clear experimental proofs. Meanwhile, the best electrocatalyst Co9S8-30@ MoSx/CC in this study exhibits excellent HER performance with an overpotential of -98 mV at -10 mA/cm(2), a small Tafel slope of 64.8 mV/dec, and prominent electrochemical stability.
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