Supported Heterostructured MoC/Mo2C Nanoribbons and Nanoflowers as Highly Active Electrocatalysts for Hydrogen Evolution Reaction
Supported Heterostructured MoC/Mo2C Nanoribbons and Nanoflowers as Highly Active Electrocatalysts for Hydrogen Evolution Reaction
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支持异质结构MoC/Mo2C纳米带和纳米花作为析氢反应的高活性电催化剂
DOI：
10.1021/acssuschemeng.9b00210
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发表时间：
2019-03
影响因子：
8.4
通讯作者：
Chen Shaowei
中科院分区：
文献类型：
--
作者：
Wei Zhaoqian;Hu Xiao;Ning Shunlian;Kang Xiongwu;Chen Shaowei
Development of low-cost and high-efficiency electrocatalysts for hydrogen evolution reaction is a critical step toward sustainable water splitting. Herein, in situ growth of heterostructured MoC/Mo2C nanoribbons and nanoflowers on copper foam (MoxC/Cu), copper foil, and nickel foam (MoxC/Ni) are prepared via a two-step method: hydrothermal preparation of molybdenum precursors followed by pyrolysis at controlled temperatures. The MoxC/Cu hybrids are found to exhibit an excellent catalytic activity, as compared to the MoxC/Ni and Cu foil counterparts, and the sample prepared at 750 °C stands out as the best among the series with a low overpotential of 169 mV to reach the current density of 200 mA cm–2 in 1 M KOH, and 194 mV in 0.5 M H2SO4, and the corresponding Tafel slopes of 98 and 74 mV dec–1, respectively. The electrocatalytic activity is also found to vary with the Mo2+/Mo3+ and N contents in the samples that impact the electrical conductivity and electron-transfer kinetics of the hydrogen evolution re...
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