Boron triggers the phase transformation of MoxC (α-MoC1-x/β-Mo2C) for enhanced hydrogen production
Boron triggers the phase transformation of MoxC (α-MoC1-x/β-Mo2C) for enhanced hydrogen production
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DOI：
10.1088/1361-6528/ab5a25
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发表时间：
2020-03-06
期刊：
影响因子：
3.5
通讯作者：
Wang, Dezhi
中科院分区：
文献类型：
--
作者：
Chen, Zijian;Guo, Ting;Wang, Dezhi
碳化钼作为高效的非贵金属基析氢反应催化剂，其物相和结构改性是提高析氢反应性能的重要途径。本文提出了一种通过硼掺杂来调制碳化钼相的新策略，从而可以很好地控制碳化钼的she性能。b掺杂后，制备的B30催化剂的HER活性明显增强，其Tafel斜率为78 mV dec(-1)，远小于空白催化剂（134 mV dec(-1)），这是由于活性位点数量增加，每个活性位点的周转频率增加，电子转移阻力降低所致。此外，该工作可以拓宽我们对相位调节的看法，并为其在其他领域的应用提供更多可能的前景。
As highly efficient non-precious metal-based catalysts for the hydrogen evolution reaction (HER), molybdenum carbides have attracted much attention over the phase and structure modification for the improvement of HER performances. In this work, a novel strategy is proposed to modulate phases of molybdenum carbides by boron doping, so that the HER performances can be well controlled. After B-doping, the HER activity of the as-prepared B30 catalyst is significantly enhanced with a much smaller Tafel slope of 78 mV dec(-1) than that of the blank one (134 mV dec(-1)), which originates from the increased amount of active sites, enhanced turnover frequency of each active site and reduced electron transfer resistance. Moreover, this work could broaden our view of phase regulation and provide more possible perspectives for the application in other fields.