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Graphite Carbon Nanosheet-Coated Cobalt-Doped Molybdenum Carbide Nanoparticles for Efficient Alkaline Hydrogen Evolution Reaction
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-12-23 , DOI: 10.1021/acsanm.0c02723 Biao Zhang 1 , Hongye Qin 1 , Yaping Pan 1 , Wanying Lin 1 , Sha Xu 2 , Qiaozhi Sun 1 , Enzuo Liu 1 , Fang He 1 , Lechen Diao 3 , Chunnian He 1 , LiYing Ma 1
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-12-23 , DOI: 10.1021/acsanm.0c02723 Biao Zhang 1 , Hongye Qin 1 , Yaping Pan 1 , Wanying Lin 1 , Sha Xu 2 , Qiaozhi Sun 1 , Enzuo Liu 1 , Fang He 1 , Lechen Diao 3 , Chunnian He 1 , LiYing Ma 1
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Nanotransition-metal based carbide (TMC) electrocatalysts owing to the desirable metallic properties and platinum-like d-band electronic configuration have arisen as potential hydrogen evolution reaction (HER) electrocatalysts recently. Nevertheless, the correlation between cation incorporation and the intrinsic catalytic performance of bimetallic TMC-based electrocatalysts is still ambiguous. In addition, low-cost and simple preparation methods need to be further developed. Herein, a template-assisted method was developed to synthesize nanoscale metallic cobalt-doped β-Mo2C nanoparticles (Co-MC NPs), which were embedded in a two-dimensional graphite carbon nanosheet (2DGC) current collector. The obtained catalytic material has a rich pore structure and excellent electron transport properties due to the ingenious preparation method. Furthermore, it was revealed with electrochemical characterization and density functional theory (DFT) simulation that Co atom substitution could effectively weaken the strength of proton adsorption at the coordination of Mo and C atoms and synchronously facilitate the H2 desorption from the active sites of Co-MC/2DGC nanostructures. Therefore Co-MC/2DGC nanoparticles display a superior HER catalytic performance; that is, an overpotential of 103 mV is required to reach a current density of 10 mA cm–2 with a Tafel slope of 76.9 mV dec–1 along with an outstanding stability in alkaline.
中文翻译：
石墨碳纳米片包覆的钴掺杂碳化钼纳米颗粒用于高效碱性氢释放反应
由于期望的金属性能和类似铂的d-带电子构型，基于纳米过渡金属的碳化物（TMC）电催化剂最近作为潜在的析氢反应（HER）电催化剂出现。然而，阳离子掺入与基于双金属TMC的电催化剂的固有催化性能之间的相关性仍然不明确。另外，低成本和简单的制备方法需要进一步发展。这里，模板辅助法的开发是为了合成纳米级金属钴掺杂-β-沫2C纳米颗粒（Co-MC NPs），嵌入到二维石墨碳纳米片（2DGC）集电器中。由于巧妙的制备方法，所获得的催化材料具有丰富的孔结构和优异的电子传输性能。此外，通过电化学表征和密度泛函理论（DFT）模拟表明，Co原子取代可有效削弱Mo和C原子配位时质子吸附的强度，并同时促进H 2从Co-的活性位点解吸。 MC / 2DGC纳米结构。因此，Co-MC / 2DGC纳米颗粒显示出优异的HER催化性能。也就是说，要达到10 mA cm –2的电流密度，需要过电位103 mVTafel斜率为76.9 mV dec –1，并具有出色的碱性稳定性。
更新日期：2021-01-22
中文翻译：
石墨碳纳米片包覆的钴掺杂碳化钼纳米颗粒用于高效碱性氢释放反应
由于期望的金属性能和类似铂的d-带电子构型，基于纳米过渡金属的碳化物（TMC）电催化剂最近作为潜在的析氢反应（HER）电催化剂出现。然而，阳离子掺入与基于双金属TMC的电催化剂的固有催化性能之间的相关性仍然不明确。另外，低成本和简单的制备方法需要进一步发展。这里，模板辅助法的开发是为了合成纳米级金属钴掺杂-β-沫2C纳米颗粒（Co-MC NPs），嵌入到二维石墨碳纳米片（2DGC）集电器中。由于巧妙的制备方法，所获得的催化材料具有丰富的孔结构和优异的电子传输性能。此外，通过电化学表征和密度泛函理论（DFT）模拟表明，Co原子取代可有效削弱Mo和C原子配位时质子吸附的强度，并同时促进H 2从Co-的活性位点解吸。 MC / 2DGC纳米结构。因此，Co-MC / 2DGC纳米颗粒显示出优异的HER催化性能。也就是说，要达到10 mA cm –2的电流密度，需要过电位103 mVTafel斜率为76.9 mV dec –1，并具有出色的碱性稳定性。
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