Lei Chunsheng, Zhou Wen, Feng Qingguo, Lei Yongpeng, Zhang Yi, Chen Yin, Qin Jiaqian
State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, People's Republic of China.
College of Environmental and Safety Engineering, Changzhou University, Changzhou, 213164, People's Republic of China.
Nanomicro Lett. 2019 Jun 1;11(1):45. doi: 10.1007/s40820-019-0279-8.
Charge engineering of carbon materials with many defects shows great potential in electrocatalysis, and molybdenum carbide (MoC) is one of the noble-metal-free electrocatalysts with the most potential. Herein, we study the MoC on pyridinic nitrogen-doped defective carbon sheets (MoNCs) as catalysts for the hydrogen evolution reaction. Theoretical calculations imply that the introduction of MoC produces a graphene wave structure, which in some senses behaves like N doping to form localized charges. Being an active electrocatalyst, MoNCs demonstrate a Tafel slope as low as 60.6 mV dec and high durability of up to 10 h in acidic media. Besides charge engineering, plentiful defects and hierarchical morphology also contribute to good performance. This work underlines the importance of charge engineering to boost catalytic performance.
具有许多缺陷的碳材料的电荷工程在电催化方面显示出巨大潜力，碳化钼（MoC）是最具潜力的无贵金属电催化剂之一。在此，我们研究了吡啶氮掺杂缺陷碳片（MoNCs）上的MoC作为析氢反应的催化剂。理论计算表明，MoC的引入产生了一种石墨烯波结构，在某种意义上其行为类似于N掺杂以形成局部电荷。作为一种活性电催化剂，MoNCs在酸性介质中表现出低至60.6 mV dec的塔菲尔斜率和高达10 h的高耐久性。除了电荷工程外，大量的缺陷和分级形态也有助于实现良好的性能。这项工作强调了电荷工程对提高催化性能的重要性。
