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Construction of hierarchical Mo2C nanoparticles onto hollow N-doped carbon polyhedrons for efficient hydrogen evolution reaction
Electrochimica Acta ( IF 5.5 ) Pub Date : 2019-08-14 , DOI: 10.1016/j.electacta.2019.134680
Lulu Chai , Linjie Zhang , Xian Wang , Zuju Ma , Ting-Ting Li , Huan Li , Yue Hu , Jinjie Qian , Shaoming Huang

In the field of renewable energy, the core of advanced materials lies in the efficiency for the electrocatalytic and photoelectrochemical overall water splitting. However, in hydrogen evolution reaction (HER), there is a lack of electrocatalysts based transition metals of high-performance and natural-abundance, and thus there is a formidable challenge for large-scale application. Therefore, molybdenum carbide (Mo2C) based catalysts and their composites are regarded as a most promising and replacement noble metal electrocatalyst for the HER in different media about all pH. In this work, the preparation of ultra-fine Mo2C nanoparticles, which uniformly implant into hollow N-doped carbon polyhedrons (Mo2[email protected]) by adopting MOF-assisted self-sacrifice template approach, is proposed. Mo2[email protected] showcases suitable catalytic activity and feasible stability toward HER in both media such as acidic and alkaline solutions. The as-prepared Mo2[email protected] exhibits effective and fast response from the HER region with nearly 0.0 V onset overpotentials, only requiring 89 mV (0.5 M H2SO4 media) and 87 mV (1.0 M KOH media) overpotential to reach 10 mA cm−2 and cycling stability (<5% performance loss after 10 h). Such distinctive activity of HER is mainly imputed to the poly-dispersion of the ultra-fine Mo2C nanoparticles and its synergistic contribution of rich nitrogen doping, unique hollow morphology, and abundant active sites at the heterostructures.



中文翻译:

在空心N掺杂碳多面体上构建分层Mo 2 C纳米粒子,以有效进行氢释放反应

在可再生能源领域,先进材料的核心在于电催化和光电化学整体水分解的效率。然而,在析氢反应(HER)中,缺乏高性能和天然丰度的基于电催化剂的过渡金属,因此对于大规模应用存在巨大的挑战。因此,基于碳化钼(Mo 2 C)的催化剂及其复合材料被认为是在所有pH值下不同介质中用于HER的最有前途和替代的贵金属电催化剂。在这项工作中,制备了超细的Mo 2 C纳米颗粒,该纳米颗粒均匀地注入到中空的N掺杂碳多面体(Mo 2通过采用MOF辅助的自我牺牲模板方法,提出了[电子邮件保护]。Mo 2 [受电子邮件保护]在酸性和碱性溶液中均显示出合适的催化活性和对HER的可行稳定性。所制备的Mo 2(受电子邮件保护)在HER区显示出快速有效的响应,且起始电位接近0.0 V,仅需达到89 mV(0.5 M H 2 SO 4介质)和87 mV(1.0 M KOH介质)的过电位即可。 10 mA cm -2和循环稳定性(10小时后性能损失<5%)。HER的这种独特活性主要归因于超细Mo 2的多分散性C纳米颗粒及其富氮掺杂,独特的空心形态和异质结构上丰富的活性位点的协同作用。

更新日期:2019-08-14
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