催化作用
材料科学
化学工程
沸石咪唑盐骨架
咪唑酯
碳纤维
阴极
电解质
热解炭
金属有机骨架
多孔性
功率密度
无机化学
纳米技术
电极
化学
热解
有机化学
复合材料
吸附
功率(物理)
物理化学
工程类
物理
复合数
量子力学
作者
Bowen Liu,Feng Liu,Dongshuang Lu,Shanshan Zhang,Cai Zhang,Zhengming Gao,Lei Shi,Yangyang Liu,Jun Shi,Lipeng Zhang,Shenlong Zhao,Dong Liu
标识
DOI:10.1016/j.cej.2021.132762
摘要
Efficient electrocatalysts for oxygen reduction reaction (ORR) are desirable but challenge in harsh conditions, which seriously limits the widespread application of many clean energy devices. Herein, a series of zeolitic imidazolate framework-8 (ZIF-8) assemblies are fabricated using a freestanding template and further used as pyrolytic precursors for synthesizing metal-free ORR catalysts. Impressively, the optimized 3D porous nitrogen-doped carbon (PNC-30) exhibits a half-wave potential of 0.90 and 0.76 V in alkaline and acidic electrolytes, respectively. Furthermore, when used as the cathode in zinc-air batteries, PNC-30 reaches a power density of 150 mW cm−2, 1.6 times higher than the commercial Pt/C. And, the PEMFCs equipped with PNC-30 cathode deliver a high power density of 562 W g−1. Experimental results and computational analysis indicate that the outstanding ORR performance is ascribed to the unique trimodal-porous structure, where micropores give abundant active sites/defects and meso-/macropores provide rapid mass transfer capabilities.
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