聚合
材料科学
化学工程
氧气
还原(数学)
氧还原
多巴胺
笼子
碳纤维
氧还原反应
多孔性
纳米技术
电化学
化学
聚合物
有机化学
电极
物理化学
生物
结构工程
复合材料
工程类
复合数
几何学
神经科学
数学
作者
Teng Wang,Yan He,Yijiang Liu,Fanjuan Guo,Xufeng Li,Hongbiao Chen,Huaming Li,Zhiqun Lin
出处
期刊:Nano Energy
[Elsevier]
日期:2020-10-14
卷期号:79: 105487-105487
被引量:127
标识
DOI:10.1016/j.nanoen.2020.105487
摘要
The ability to develop highly-efficient bifunctional electrocatalysts via facile and cost-effective routes is of practical interest for enabling concurrent oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Herein, we report a simple yet robust strategy via zeolitic imidazolate framework (ZIF)-triggered rapid polymerization of dopamine for crafting cage-in-cage hollow porous carbon codoped with Co and N for highly-efficient ORR and OER electrocatalysts. First, dopamine (DA) is expeditiously polymerized on ZIF-67 within 10 min at room temperature, yielding yolk-shelled [email protected]x (denoted [email protected]x) particles with tunable PDA thickness. This contrast sharply to the copious past works where alkaline compounds are needed for the polymerization of DA. More importantly, the ZIF-67-triggered polymerization of DA is substantiated to undergo a coordination-dissociation-polymerization mechanism rendered by the synergistic effect of Co2+ and 2-methylamidazole. Subsequent one-step pyrolysis of [email protected] yields Co and N codoped cage-in-cage porous carbon (denoted Co/N CCPC-x). The resulting Co/N CCPC pyrolyzed at 600 °C manifests a superior ORR with the onset and half-wave potentials comparable to Pt/C and limiting current density larger than Pt/C, OER with low overpotential and potential difference, and Zn-air performance with high open-circuit voltage, specific capacity, power density and remarkable charge-discharge reversibility. Such impressive ORR and OER performances of Co/N CCPC are a direct consequence of simultaneous compositional (i.e., Co and N codoping) and structural (i.e., cage-in-cage architecture with hierarchical porosity) tailoring enabled by judicious PDA coating.
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