过电位
塔菲尔方程
电催化剂
材料科学
化学工程
催化作用
钴
煅烧
静电纺丝
碳纤维
碳纳米纤维
硫化钴
纳米技术
碳纳米管
电化学
化学
电极
复合材料
物理化学
有机化学
聚合物
复合数
工程类
冶金
作者
Helin Zhang,Lili Wang,Wurigamula He,Lingxin Chen,Hong Shao,Wensheng Yu,Duanduan Yin,Xiangting Dong
标识
DOI:10.1016/j.ijhydene.2022.06.284
摘要
Hydrogen is a viable substitute to fossil fuels and electrochemically catalyzed hydrogen evolution has attracted wide attention due to its stability and effectiveness. Nevertheless it is still a major challenge to design and prepare highly active noble metal-free electrocatalysts with controllable structure and composition for efficient hydrogen evolution reaction (HER). Herein, Mo2C regulated by cobalt components (Co and CoO) doping in N-doped hollow carbon nanofibers (marked as Mo2C/Co/CoO-NHCNFs) are firstly designed and prepared via a facile coaxial electrospinning followed by calcination process. The one-dimensional conductive carbon host, hollow structure and synergistic effect among CoO, Co and Mo2C can jointly promote electron transfer, augment exposure of active sites and adjust the electronic structure of the active sites, resulting in the excellent of HER performances. The optimized catalyst has a high specific surface area of 101.27 m2 g−1. Meanwhile, it has a low overpotential of 143 mV at a current density of 10 mA cm−2 and a small Tafel slope of 74 mV dec−1 in 1.0 M KOH. Satisfactorily, the overpotential is reduced by 231 mV at the same current density compared with Mo2C doped in N-doped carbon nanofibers (named as Mo2C-NCNFs). Moreover, the Mo2C/Co/CoO-NHCNFs also demonstrate superior long-term stability. The formative mechanism of Mo2C/Co/CoO-NHCNFs is expounded, and the construction technique is established. The design philosophy and the simple and economical method are of significance for development of HER electrocatalysts.
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