塔菲尔方程
杂原子
催化作用
电催化剂
化学工程
碳纤维
材料科学
钴
化学
无机化学
纳米技术
电化学
电极
复合数
复合材料
有机化学
物理化学
工程类
戒指(化学)
作者
Zhong Li,Qi Huang,Junyang Ding,Yuanyuan Guo,Wang Xian,Lulu Chai,Tingting Li,Yue Hu,Jinjie Qian,Shaoming Huang
标识
DOI:10.1016/j.jpowsour.2021.229632
摘要
It is of great importance to find non-precious metal based oxygen reduction reaction (ORR) catalysts with high stability, high performance and low cost. In this context, hierarchically porous carbon-based nanomaterials doped with heteroatoms are regarded as one of promising catalysts for ORR. Herein, a bottom-up approach is proposed by using the initial MOF-derived [email protected] core-shell structure as a template to obtain hollow cobalt-anchored N-doped carbon material followed by acid etching (A-CoNC). It exhibits a type of hollow porous nitrogen-carbon network anchored by well-dispersed atomic Co-Nx sites with high activity and stable catalytic performance. The as-obtained A-CoNC shows high electrocatalytic ORR activity, good reaction selectivity with the low Tafel slope of 55.5 mV dec−1, large limited current density of 5.37 mA cm−2 and excellent long-term stability (retention = 96.1%, time = 10 h). Furthermore, A-CoNC can also be serving as efficient electrocatalysts for zinc-air battery with a high power density of 144.0 mW cm−2. Our synthetic strategy from the MOF-derived core-shell structure to ORR electrocatalyst provides new pathway for the design and preparation of highly efficient electro-/photo-catalysts stemmed from MOFs materials.
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