Construction of hierarchical Mo2C nanoparticles onto hollow N-doped carbon polyhedrons for efficient hydrogen evolution reaction

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 (Mo2C@HNCPs) by adopting MOF-assisted self-sacrifice template approach, is proposed. Mo2C@HNCPs showcases suitable catalytic activity and feasible stability toward HER in both media such as acidic and alkaline solutions. The as-prepared Mo2C@HNCPs 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 (

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全水分解的效率。然而，在析氢反应（HER）中，缺乏基于高性能且天然储量丰富的过渡金属的电催化剂，因此大规模应用面临巨大挑战。所以，碳化钼（Mo₂C）基催化剂及其复合材料被视为在所有pH值的不同介质中析氢反应最有前景的可替代贵金属电催化剂。在这项工作中，提出了采用金属有机框架（MOF）辅助的自牺牲模板方法制备均匀嵌入中空氮掺杂碳多面体（Mo₂C@HNCPs）的超细Mo₂C纳米粒子。Mo₂C@HNCPs在酸性和碱性溶液等两种介质中对析氢反应都表现出合适的催化活性和良好的稳定性。所制备的Mo₂C@HNCPs在析氢区域表现出有效且快速的响应，起始过电位接近0.0 V，仅需89 mV（在0.5 M H₂SO₄介质中）和87 mV（在1.0 M KOH介质中）的过电位就能达到10 mA/cm²，并且具有循环稳定性（……）