Defect-rich MoS2 nanosheets vertically grown on graphene-protected Ni foams for high efficient electrocatalytic hydrogen evolution |
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| Authors: | Peng Zhu Yu Chen Yu Zhou Zhixiong Yang Di Wu Xiang Xiong Fangping Ouyang |
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| Affiliation: | 1. Powder Metallurgy Research Institute and State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, People''s Republic of China;2. School of Physics and Electronics, and Institute of Super-microstructure and Ultrafast Process in Advanced Materials, Central South University, Changsha 410083, People''s Republic of China;3. Department of Mechanical Engineering and Materials Science, Yale University, New Haven, CT 06511, USA |
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| Abstract: | Defect-rich MoS2 nanosheets are vertically grown on graphene-protected Ni foam by a facial hydrothermal route. The vertically aligned MoS2 nanosheets with defects such as cracks, amorphousness and oxygen-incorporated disorders endow these as-synthesized catalysts with rich active sites, high conductivity and good stability. The graphene deposited on Ni foam increases its stability in acid. The optimized catalyst exhibits high activity for hydrogen evolution with a quite low overpotential of 140 mV at 10 mA cm?2, a small Tafel slope of 42 mV decade?1, and a large exchange current density of 63 μA/cm2, as well as excellent stability. This performance is superior to most of its analogue MoS2 and many transition metal sulfides. This work will broaden the vision to improve the activity of self-supported electrocatalysts by carefully designing the anchored catalysts. |
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| Keywords: | Self-supported electrocatalysts Graphene-protected Ni foam substrate Oxygen-incorporated disorders Hydrogen evolution reaction |
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