电催化剂
电池(电)
氧气
纳米颗粒
催化作用
阴极
化学
离解(化学)
析氧
碳纤维
吸附
无机化学
材料科学
化学工程
纳米技术
电化学
电极
物理化学
热力学
有机化学
工程类
物理
复合材料
复合数
功率(物理)
作者
Xin Luo,Shikai Zhao,Zhen Luo,Shentian Li,Xiao Zhao,Qie Fang,Xiaoqian Wei,Hengjia Wang,Canglong Wang,Zhihong Zhu,Wenling Gu
标识
DOI:10.1016/j.cej.2023.142184
摘要
The development of metal-nitrogen-codoped carbon catalysts for oxygen reduction reaction (ORR) is highly desired for the practical applications of energy conversion technologies, but there remains a challenge in elucidating mechanisms of structure–activity relationship for enhancing electrocatalytic performance. Herein, we propose a general approach for the synthesis of metallic RuCo nanoparticles and CoNx species embedded in N-doped carbon electrocatalysts (RuCo@CoNC). Benefiting from the synergistic effect of chemical compositions and 3D hierarchical structures, RuCo@CoNC exhibits high ORR activity and superior durability, outperforming Pt/C catalysts. Density functional theory further reveals that Ru@CoNx possesses stronger reactant adsorption ability and a lower dissociation energy barrier than Co@CoNx, which is conducive to accelerating ORR kinetics. Moreover, the Zn-air battery using RuCo@CoNC as the air cathode presents higher power densities, larger specific capacities and stronger cycling stability, outperforming the Pt/C + RuO2 counterparts. This work presents a perspective for the controllable design of highly-efficient electrocatalysts for energy storage applications.
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