Sulfur-Rich Molybdenum Sulfide Grown on Porous N-Doped Graphene for Efficient Hydrogen Evolution

Sulfur-Rich Molybdenum Sulfide Grown on Porous N-Doped Graphene for Efficient Hydrogen Evolution
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在多孔氮掺杂石墨烯上生长的富硫硫化钼可有效析氢

DOI:
10.1021/acs.iecr.0c00388
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发表时间:
2020-06
影响因子:
4.2
通讯作者:
Xiaobin Fan
Xiaobin Fan
中科院分区:
工程技术3区
文献类型:
--
作者:
Peng Juan;Junmei Liang;Tao Chen;Qicheng Zhang;Wenchao Peng;Yang Li;Fengbao Zhang;Xiaobin Fan

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二硫化钼及其衍生物被认为是一种有前途的 用于析氢反应(HER)的催化剂,以及它们的边缘 硫位点是HER性能的关键因素。在这里,我们开发 一种简单的策略来生长具有更多活性硫位点的非化学计量硫化钼(MoSx), N掺杂石墨烯(MoSx@CN)。实验 证明多孔N掺杂石墨烯的引入不仅 有利于电荷的快速转移和有效渗透 但是N掺杂剂可以用作成核剂, MoSx拥有更活跃的 桥接S22位点。因此 所得MoSx@CN催化剂具有 突出的HER活性,其显示出256 mV的过电位, 100 mA cm-2,Tafel斜率为49 mV dec-1。本研究为优化转型提供了新的策略 用于能源相关应用的金属二硫属化物基催化剂。
MoS2 and its derivates have been regarded as a promising catalyst for the hydrogen evolution reaction (HER), and their edge sulfur sites are key factors for the HER performance. Here, we develop a facile strategy to grow nonstoichiometric molybdenum sulfide (MoSx) with more active sulfur sites on porous N-doped graphene (MoSx@CN). Experiments demonstrate that the introduction of porous N-doped graphene not only facilitates the fast transfer of charge and the efficient infiltration of the electrolyte but the N dopants could be used as the nucleation sites for MoSx to possess more active bridging S22– sites. Consequently, the obtained MoSx@CN catalyst possesses an outstanding HER activity, which shows an overpotential of 256 mV at 100 mA cm–2 with a Tafel slope of 49 mV dec–1. This study provides a new strategy to optimize transition metal dichalcogenide-based catalysts for energy-related applications.
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