Accelerated Hydrogen Evolution Reaction in CoS2 by Transition-Metal Doping,ACS Energy Letters

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Accelerated Hydrogen Evolution Reaction in CoS2 by Transition-Metal Doping
ACS Energy Letters ( IF 19.3 ) Pub Date : 2018-03-05 00:00:00 , DOI: 10.1021/acsenergylett.8b00066
Jingyan Zhang ₁ , Yuchan Liu ₁ , Changqi Sun ₁ , Pinxian Xi ₁ , Shanglong Peng ₁ , Daqiang Gao ₁ , Desheng Xue ₁

Affiliation

Cobalt pyrite (CoS₂) is one of the promising candidate catalysts for electrocatalytic hydrogen evolution because of its efficient catalytic activity sites and inherent metallicity. Herein, we report the greatly improved electrocatalytic activity of CoS₂ resulting from Mn doping. First, we give the theoretical prediction that Mn is the most excellent dopant to activate the electrocatalytic activity of CoS₂ with the smallest Gibbs free energy (|ΔG_H*|) while remaining metallic. Second, to provide experimental evidence, Mn-doped CoS₂ nanowires are prepared by a hydrothermal and postsulfuration method. The optimized sample shows a low overpotential of 43 mV at 10 mA/cm², a Tafel slope of only 34 mV/dec, and long-time stability for the hydrogen evolution reaction. This work reveals a new way to stimulate the electrocatalytic activity of other pristine candidate catalysts.

中文翻译：

过渡金属掺杂在CoS _2中加速氢析出反应

黄铁酸钴（CoS ₂）由于其有效的催化活性位点和固有的金属性，是用于电催化制氢的有希望的候选催化剂之一。在此，我们报道了由于Mn掺杂而大大提高了CoS _2的电催化活性。首先，我们给出理论上的预测，即锰是激活CoS ₂电催化活性最优异的掺杂剂，具有最小的吉布斯自由能（| ΔG _{H *} |），同时保持金属态。其次，为了提供实验证据，通过水热和后硫化法制备了Mn掺杂的CoS ₂纳米线。优化的样品在10 mA / cm ^2时显示出43 mV的低过电势，Tafel斜率仅为34 mV / dec，并且对于析氢反应具有长期稳定性。这项工作揭示了一种刺激其他原始候选催化剂电催化活性的新方法。

更新日期：2018-03-05

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