Exploring Active Sites in Multi-Heteroatom-Doped Co-Based Catalysts for Hydrogen Evolution Reactions.
Exploring Active Sites in Multi-Heteroatom-Doped Co-Based Catalysts for Hydrogen Evolution Reactions.
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DOI：
10.1002/chem.201802684
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发表时间：
2018-07
期刊：
影响因子：
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通讯作者：
A. Shahraei;I. Martinaiou;K. Creutz;Markus Kübler;N. Weidler;S. T. Ranecky;W. Wallace;M. Nowroozi-M.-No
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文献类型：
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作者：
A. Shahraei;I. Martinaiou;K. Creutz;Markus Kübler;N. Weidler;S. T. Ranecky;W. Wallace;M. Nowroozi-M.-No
如今，已知金属-N-以及金属-S-掺杂的碳材料催化析氢反应（HER）。然而，特别是N-和S-共掺杂的催化剂达到最高活性，但仍然不清楚活性是否与MNx或MSy（M=金属）位点有关。本文采用一种简单的多杂原子掺杂方法，研究了钴含量对酸性介质中HER的影响。的CoNx和CoSy网站的基础上证明的结构表征的拉曼，X-射线诱导光电子能谱，和TEM。硫的存在使得能够形成大量的CoNx位点。结构-性能关系证明HER活性由CoNx而不是CoSy位点主导。最具活性的催化剂在恒电流条件下也表现出优异的稳定性，使它们对电解槽应用感兴趣。
Today, metal-N- as well as metal-S-doped carbon materials are known to catalyze the hydrogen evolution reaction (HER). However, especially N- and S-co-doped catalysts reach highest activity, but it remains unclear if the activity is related to MNx or MSy (M=metal) sites. In this work we apply a simple method for multi-heteroatom doping and investigate the effect of cobalt content on the HER in acidic medium. The CoNx and CoSy sites were evidenced on the basis of structural characterization by Raman, X-ray induced photoelectron spectroscopy, and TEM. The presence of sulfur enables the formation of a larger number of CoNx sites. Structure-performance relationship proves that the HER activity is dominated by CoNx rather than CoSy sites. The most active catalysts also exhibit an excellent stability under galvanostatic conditions making them of interest for electrolyser application.