双功能
材料科学
电催化剂
纳米片
析氧
咪唑酯
碳纤维
沸石咪唑盐骨架
化学工程
催化作用
纳米颗粒
金属
热处理
电极
纳米技术
电化学
金属有机骨架
冶金
复合材料
化学
复合数
有机化学
工程类
吸附
物理化学
作者
Yi Guan,Yongliang Li,Shuangling Luo,Xiangzhong Ren,Libo Deng,Lingna Sun,Hongwei Mi,Peixin Zhang,Jianhong Liu
标识
DOI:10.1016/j.apcatb.2019.117871
摘要
Herein, a bottom-up method, i.e., a surfactant-assisted synthetic method to synthesize a novel dual-metal (Co/Zn) zeolitic-imidazolate framework (ZIF) that could maintain its positive-hexagon-shaped morphology after high-temperature thermal treatment, has been developed. As a bifunctional electrocatalyst, the Co nanoparticles encapsulated into both nitrogen-doped positive-hexagon-shaped carbon nanosheets and carbon nanotubes distributed over the nanosheet surface (Co-N-PHCNTs) show excellent electrocatalytic performance, superior to that of state-of-the-art benchmark noble-metal electrocatalysts. Remarkably, in a practical demonstration, the Co-N-PHCNTs serve as bifunctional air electrodes for Zn–air batteries, exhibiting a high peak power density of ≈125.41 mW cm−2 at a current density of ≈130 mA cm−2 with an extraordinary charge-discharge cyclability of over 673 h at 5 mA cm−2. This strategy not only provides guidance for the synthesis of 2D ZIF-derived materials but also for other 2D materials in cross-cutting applications.
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