Transition metal carbides (TMC) modified by mesoporous carbon nanosheets (MCNSs) with high activity, fast electron/ion transfer and long durability are considered as promising electrocatalysts for hydrogen evolution reaction (HER). However, most current synthesis methods involve in multistep, long duration and low output. In this work, Cr3C2, WC and VC nanoparticles embedded in mesoporous carbon nanosheets (TMC-NPs@MCNSs) were fabricated via a template-free and time-saving route by solution combustion synthesis. All TMC-NPs@MCNSs displayed good electrocatalytic activity for HER, and the Tafel plots of Cr3C2-NPs@MCNS, VC-NPs@MCNS and WC-NPs@MCNS electrocatalysts were 85, 77 and 56 mV·dec−1, respectively. WC-NPs@MCNSs exhibited lower Tafel slope and overpotentials of 137 mV at ŋ10 (a current density of 10 mA·cm−2), which could be ascribed to mesoporous structure, smaller particles size and strong electron interaction between W and C that promoted electron/ion transfer, maintained the structure integrity and enhanced the HER activity.
Graphical abstract
摘要
以中孔碳纳米片修饰的过渡金属碳化物以其较高的反应活性、电子传输速率以及电解稳定性可作为替代铂系贵金属催化电极的材料之一。然而, 目前高催化活性、高稳定性电极材料的制备方法普遍合成过程长、能耗高、产率低。在本文中, 采用燃烧合成法分别合成了Cr3C2、VC、WC与中孔碳纳米片复合材料 (TMC-NPs@MCNSs)。三种材料均显示出较高的电催化反应活性, Cr3C2-NPs@MCNSs, VC-NPs@MCNSs和 WC-NPs@MCNSs的塔菲尔斜率分别为85, 77和56 mV·dec-1。其中, 当电流密度为10mA·cm-2时, WC-NPs@MCNSs对应的过电位值为137 mV, 表现出更好的析氢性能。优异的电催化性能与碳纳米片中孔结构、较小粒径、WC化学性质紧密相关。
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Acknowledgements
This study was financially supported by the National Natural Science Foundation of China (Nos. 52131307, 52130407, 52071013, 52104359, 51774035 and 52174344), the National Key Research and Development Program of China (No. 2021YFB3701900), the Natural Science Foundation Program of Beijing (Nos. 2202031, 2174079 and 2162027), the Science and Technology Program of Hebei (No. 20311001D), the Fundamental Research Funds for the Central Universities (Nos. FRF-TP-19-003C2, FRF-IDRY-19-025, FRF-IDRY-20-022, FRF-TP-20-032A2 and FRF-TP-20-100A1Z), the Scientific and Technological Innovation Foundation of Foshan (No. BK21BE007), the Postdoctoral Research Foundation of Shunde Graduate School of University of Science and Technology Beijing (No. 2020BH014) and the Natural Science Foundation Program of Hunan (No. 2021JJ30250).
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Yu, Y., Wang, XL., Zhang, HK. et al. Facile synthesis of transition metal carbide nanoparticles embedded in mesoporous carbon nanosheets for hydrogen evolution reaction. Rare Met. 41, 2237–2242 (2022). https://doi.org/10.1007/s12598-022-01991-6
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DOI: https://doi.org/10.1007/s12598-022-01991-6