期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 5, 页码 6250-6261出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b19382
关键词
materials chemistry; electrospinning; core/shell structures; heterointerfaces; water splitting
资金
- National Natural Science Foundation of China (NSFC) [51803077]
- Natural Science Foundation of Jiangsu Province [BK20180627]
- Postdoctoral Science Foundation of China [2018M630517, 2019T120389]
- MOE [B13025]
- SAFEA [B13025]
- national first-class discipline program of Light Industry Technology and Engineering [LITE2018-19]
- Fundamental Research Funds for the Central Universities
The appropriate catalyst model with a precisely designed interface is highly desirable for revealing the real active site at the atomic level. Herein, we report a proof-of-concept strategy for creating an exposed and embedding interface model by constructing a unique Co9S8 core with a full WS2 shell (Co9S8/FWS2) and a half WS2 shell (Co9S8/HWS2) to uncover the synergistic effect of heterointerfaces on the catalytic performances. Tailoring the heteroepitaxial growth of WS2 shell, Co9S8/HWS2 with exposed Co-S-W interfaces leads to the exceptional electron density changes on edged-S atoms with large amounts of lone-pair electrons. Meanwhile, the unique Co9S8/HWS2 could accelerate the kinetic adsorption of hydrogen- and oxygen-containing intermediates. Such Co9S8/HWS2 electrocatalysts show extremely low overpotentials of 78 and 290 mV at a current density of 10 mA cm(-2) for hydrogen evolution reaction (HER) and oxygen evolution reaction, respectively. Using Co9S8/HWS2 as both the cathode and anode, an alkali electrolyzer delivers a current density of 10 mA cm(-2) at a quite low cell voltage of 1.60 V. The results of both operando Raman spectroscopy and electron spin resonance indicate the presence of S-S terminal and S-S bridging with unsaturated S atoms during the HER process. The present work reveals the synergistic effects of nanoscale interfaces on overall electrocatalytic water splitting.
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