Abstract
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/cm2, a small Tafel slope of 64.8 mV/dec, and prominent electrochemical stability.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 470-478 |
| Number of pages | 9 |
| Journal | Nano Energy |
| Volume | 32 |
| DOIs | |
| State | Published - Jan 7 2017 |
Bibliographical note
KAUST Repository Item: Exported on 2020-10-01Acknowledgements: This work was financially supported by the National Natural Science Foundation of China (Grant No. 51472164), the Natural Science Foundation of SZU (Grant No. 000050), the 1000 Talents Program for Young Scientists of China, the Educational Commission of Guangdong Province (Grant No. 2015KGJHZ006), the Science and Technology Planning Project of Guangdong Province (Grant No. 2016B050501005), the China Postdoctoral Science Foundation (Grant No. 2016M592538), and King Abdullah University of Science and Technology (KAUST), Saudi Arabia.