Controllable synthesis of molybdenum carbide nanoparticles embedded in porous graphitized carbon matrixes as efficient electrocatalyst for hydrogen evolution reaction
Controllable synthesis of molybdenum carbide nanoparticles embedded in porous graphitized carbon matrixes as efficient electrocatalyst for hydrogen evolution reaction
复制标题
可控合成嵌入多孔石墨化碳基体中的碳化钼纳米颗粒作为析氢反应的高效电催化剂
DOI：
10.1016/j.electacta.2016.08.104
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发表时间：
2016
影响因子：
6.6
通讯作者：
Wang Yu
中科院分区：
文献类型：
--
作者：
Mu Yanping;Zhang Yan;Fang Ling;Liu Li;Zhang Huijuan;Wang Yu
采用简单的一步固相反应法，在多孔片状石墨化碳基体（Mo 2C/C）中可控合成了碳化钼纳米颗粒。值得注意的是，多孔石墨化碳基体，可以有效地抑制Mo 2C纳米颗粒聚集，提高合成的复合材料的导电性，来自经济和环保的农业副产品玉米秸秆。由于Mo 2 C/C复合材料具有结构新颖、尺寸小、比表面积大、电导率高等特点，在0.5 M H2SO 4中作为析氢反应的电催化剂时，表现出了优异的上级性能。实现10 mA cm− 2电流密度的过电位（η10）低至114 mV，塔菲尔斜率仅为52 mV dec−1。此外，Mo 2C/C复合材料显示出0.286 mA cm-2的大交换电流密度（j 0）。在酸性条件下，Mo 2C/C复合材料的活性和稳定性都很好，在碱性和酸性条件下，Mo 2C/C复合材料的活性和稳定性相当。
Molybdenum carbide nanoparticles embedded in porous sheet-like graphitized carbon matrixes (Mo2C/C) were controllably synthesized by a simple one-step solid reaction strategy. Remarkably, the porous graphitized carbon matrixes, which can efficiently restrain Mo2C nanoparticles from aggregation and improve the conductivity of the synthesized composites, are derived from the economic and environment-friendly agricultural by-product of cornstalks. Thanks to the novel structure, small size, large surface active area and high conductivity, the Mo2C/C composites exhibits superior performance when they are used as electrocatalyst in 0.5 M H2SO4for hydrogen evolution reaction (HER). The overpotential (η10) to achieve a current density of 10 mA cm−2is low to 114 mV, and the Tafel slope is only 52 mV dec−1. Besides, the Mo2C/C composites show large exchange current density (j0) of 0.286 mA cm−2. Furthermore, the synthesized sample behaves excellent stability over 20 h in acidic media for HER. More interestingly, the Mo2C/C composites behave comparable activities and stability in basic condition with those in acidic condition, which is meritorious.