Bimetallic Co/Mo2C Nanoparticles Embedded in 3D Hierarchical N-doped Carbon Heterostructures as Highly Efficient Electrocatalysts for Water Splitting
Bimetallic Co/Mo2C Nanoparticles Embedded in 3D Hierarchical N-doped Carbon Heterostructures as Highly Efficient Electrocatalysts for Water Splitting
复制标题
嵌入 3D 分层 N 掺杂碳异质结构中的双金属 Co/Mo2C 纳米粒子作为高效水分解电催化剂
DOI：
10.1002/cctc.202000494
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发表时间：
2020
期刊：
影响因子：
4.5
通讯作者：
Han Jiantao T.
中科院分区：
文献类型：
--
作者：
Zhang Jinxu;Sun Xueping P.;Wei Peng;Lu Gongchang;Sun Shixiong;Xu Yue;Fang Chun;Li Qing;Han Jiantao T.
调控电催化剂的本征电子结构和几何结构是解决未来大规模电制氢过程中析氧反应（OER）和析氢反应（HER）动力学缓慢、过电位大等问题的有效途径。本文采用静电纺丝法成功制备了Co/Mo 2C双功能电催化剂，并将其封装在三维层次氮掺杂碳纳米纤维（3D hierarchical nitrogen-doped carbon nanofibers，Co/Mo 2C-NCNTs）中。由于Co和Mo 2C纳米颗粒之间独特的异质结构和强烈的协同效应，以提高OH-亲和力，缓和Mo-H键，并暴露更多的活性位点，Co/Mo 2C-NCNTs显示出微小的OER（eta（10）=310 mV）和HER（eta（10）=170 mV）的过电位，并稳定运行24 h。在水电解装置上的实验结果表明，法拉第效率接近100%，进一步证明了该方法制备高效水裂解双功能非贵金属电催化剂的可行性和有效性。
Modulating intrinsic electronic and geometric structures of bimetallic electrocatalysts has been regarded as a promising strategy to effectively solve the sluggish kinetics and large overpotential of OER (Oxygen evolution reaction) and HER (Hydrogen evolution reaction) involved in future large-scale electricity-to-hydrogen generation. Here, the bifunctional Co/Mo2C electrocatalysts encapsulated in 3D hierarchical nitrogen-doped carbon nanofibers synchronously rooted with abundant carbon nanotubes (Co/Mo2C-NCNTs) were successfully fabricated by a facile electrospinning method. Due to the unique heterostructures and strong synergetic effects between Co and Mo2C nanoparticles to improve OH- affinity, moderate Mo-H bonds, and expose more active sites, the Co/Mo2C-NCNTs displayed a tiny overpotential for OER (eta(10)=310 mV) and HER (eta(10)=170 mV) and stably operated for 24 h. Moreover, the results of a water electrolysis device demonstrated that the faradaic efficiency was close to 100 %, which further proved that this method was feasible and effective to fabricate high-efficiency bifunctional non-noble electrocatalysts for water splitting.