State Key Laboratory of Chemical Resource Engineering, Key Laboratory of Carbon Fiber and Functional Polymers, Beijing University of Chemical Technology, China.
Nanoscale. 2018 Sep 20;10(36):17021-17029. doi: 10.1039/c8nr02492h.
Sluggish kinetics and thermodynamic unfavorability restrict electrocatalysis for energy storage and conversion reactions such as oxygen reduction/evolution and hydrogen evolution reactions. Herein, we report the synthesis and electrochemical performance of novel core-shell nanoparticles@porous carbon microspheres. A unique core-shell architecture of dual-phase FeCo-based nanoparticles@heteroatom-doped carbon microspheres (FeCo@C MS) has been prepared via a two-step carbonization process from a reactive multifunctional core-double shell template. With the advantages of heterogeneous composition and architectural structure, the obtained FeCo@C MS exhibits excellent performances for the electrochemical oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER), which are comparable to those of commercial Pt/C catalyst. As an excellent cathode catalyst of the Zn-air battery (ZAB), FeCo@C MS exhibits high discharge voltage of 1.27 V, high specific capacity of 503 mA h gZn-1, an energy density of 639 W h kgZn-1, and better cycling durability than the battery having a mixture of 20 wt% Pt/C and RuO2. This approach provides a new way to design structures with controlled morphology and excellent multifunctional electrocatalytic activity.
动力学缓慢和热力学不利限制了储能和转换反应（如氧还原/析氧和析氢反应）的电催化。本文报道了新型核壳纳米粒子@多孔碳微球的合成及电化学性能。通过两步碳化反应，从一种反应性多功能核-双壳模板制备了独特的双相 FeCo 基纳米粒子@杂原子掺杂碳微球（FeCo@C MS）核壳结构。由于具有异质组成和结构的优势，所得到的 FeCo@C MS 对电化学氧还原反应（ORR）和析氢反应（HER）表现出优异的性能，可与商业 Pt/C 催化剂相媲美。作为锌空气电池（ZAB）的优良阴极催化剂，FeCo@C MS 表现出高的放电电压 1.27 V、高的比容量 503 mA h gZn-1、能量密度 639 W h kgZn-1，以及优于含有 20 wt%Pt/C 和 RuO2 的混合物的电池的循环耐久性。该方法为设计具有可控形态和优异多功能电催化活性的结构提供了一种新途径。
