电催化剂
碳纤维
材料科学
碳纳米管
电池(电)
钴
纳米颗粒
化学工程
纳米技术
复合材料
冶金
化学
电极
复合数
电化学
工程类
物理化学
功率(物理)
物理
量子力学
作者
Ao Xie,Xuefeng Tai,Yujing Guo,Jinyuan Miao,D. Liu,Rufei Zhang,Linting Cheng,Zemin Zhao,Yang Tang,Xiaojin Yang,Junqing Pan,Pingyu Wan
出处
期刊:Carbon
[Elsevier]
日期:2024-09-01
卷期号:228: 119299-119299
标识
DOI:10.1016/j.carbon.2024.119299
摘要
Devising the synthesis strategy and uncovering the evolution mechanism of carbon-based materials are critical to the development of efficient oxygen reduction reaction (ORR) electrocatalysts for renewable energy storage systems. This study reports a hierarchical ORR electrocatalyst, Co@N-CNTs/3DHC, which features ultrafine cobalt nanoparticles embedded in nitrogen-doped carbon nanotubes (Co@N-CNTs) and Co@N-CNTs firmly anchored in the nano-chambers of a three-dimensional honeycomb-like porous carbon (3DHC). The synthesis strategy of Co@N-CNTs/3DHC involves the initial construction of a precursor, followed by controllable pyrolysis step. Based on detailed analysis of both evolved gases and carbonized products of precursors, the evolution mechanism of Co@N-CNTs/3DHC is specifically proposed. Prompted by the electron reconfiguration, extensive reaction interface and fast mass-transfer pathway, the as-synthesized hierarchical Co@N-CNTs/3DHC displays superior ORR activity in alkaline media (0.88 V of half-wave potential) compared to commercial Pt/C. Impressively, zinc-air battery equipped with Co@N-CNTs/3DHC cathode presents outstanding discharge voltage and exceptional stability. This work highlights a unique perspective on the synthesis strategy and growth mechanism of Co@N-CNTs@3DHC toward creation of hierarchical 3D carbon-based composite for advanced electrochemical energy devices.
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