Enhanced hydrogen evolution reaction of WS2–CoS2 heterostructure by synergistic effect
| Autor: | Xiaodong Zhang, Chengwang Xie, Haitao Dai, Xiaoyu Mu, Ruijuan Yan, Haile Liu, Yaqi Jing, Changlong Liu |
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| Rok vydání: | 2019 |
| Předmět: |
Tafel equation
Materials science Renewable Energy Sustainability and the Environment Energy Engineering and Power Technology Heterojunction 02 engineering and technology Crystal structure Conductivity Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Electron transfer Fuel Technology Transition metal Chemical engineering Specific surface area 0210 nano-technology |
| Zdroj: | International Journal of Hydrogen Energy. 44:809-818 |
| ISSN: | 0360-3199 |
| Popis: | Transition metal dichalcogenides (TMDs) have attracted significant research interest due to its promising performance in hydrogen evolution reaction (HER). Synergistic effect between materials interface can improve the electrocatalytic properties. In this work, the WS2–CoS2 heterostructure supported on carbon paper (CP) was elaborately fabricated by a three-step method. Owing to the synergistic effect, WS2–CoS2 heterostructure exhibits an excellent electrocatalytic activity with a low overpotential of 245 mV at 100 mA/cm2 and a small Tafel slope of 270 mV/dec toward HER. We demonstrate that the increased specific surface area and conductivity of the heterostructure play a key role in enhancing the overall catalytic efficiency. Moreover, the crystal lattice distortion in the heterostructure could induce charge redistribution and improve electron transfer efficiency, which may also benefit the whole HER activity. |
| Databáze: | OpenAIRE |
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