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MoS₂ nanosheet-coated CoS₂ nanowire arrays on carbon cloth as three-dimensional electrodes for efficient electrocatalytic hydrogen evolution

Huang, Jilin, Hou, Dongman, Zhou, Yucheng, Zhou, Weijia, Li, Guoqiang, Tang, Zhenghua, Li, Ligui, Chen, Shaowei
Journal of materials chemistry A 2015 v.3 no.45 pp. 22886-22891
ammonium compounds, carbon, catalysts, catalytic activity, cobalt, durability, electrochemistry, electrodes, hydrogen production, molybdenum disulfide, nanosheets, nanowires, renewable energy sources
The design and engineering of low-cost and high-efficiency electrocatalysts for the hydrogen evolution reaction (HER) has attracted increasing interest in renewable energy research. Herein, MoS₂ nanosheet-coated CoS₂ nanowire arrays supported on carbon cloth (MoS₂/CoS₂/CC) were prepared by a two-step procedure that entailed the hydrothermal growth of Co(OH)₂ nanowire arrays on carbon cloth followed by reaction with (NH₄)₂MoS₄ to grow an overlayer of MoS₂ nanosheets. Electrochemical studies showed that the obtained 3D electrode exhibited excellent HER activity with an overpotential of −87 mV at 10 mA cm⁻², a small Tafel slope of 73.4 mV dec⁻¹ and prominent electrochemical durability. The results presented herein may offer a new methodology for the design and engineering of effective multilevel structured catalysts for the HER based on earth-abundant components.