A Pyrolysis-Free Method Toward Large-Scale Synthesis of Ultra-Highly Efficient Bifunctional Oxygen Electrocatalyst for Zinc-Air Flow Batteries

被引:28
作者
Li, Xueli [1 ]
Liu, Di [1 ]
Liu, Qingbin [1 ]
Xiang, Zhonghua [1 ]
机构
[1] Beijing Univ Chem Technol, State Key Lab Organ Inorgan Composites, Beijing 100029, Peoples R China
基金
北京市自然科学基金;
关键词
bifunctional oxygen catalysts; covalent organic polymers; large-scale preparation; pyrolysis-free; zinc-air flow batteries; COVALENT ORGANIC POLYMERS; MEMBRANE FUEL-CELLS; ENERGY-CONVERSION; CATHODE CATALYSTS; REDUCTION; CARBON; GRAPHENE; SITES; IDENTIFICATION; DESIGN;
D O I
10.1002/smll.202201197
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The transition-metal nitrogen-carbon (M-N-C) catalysts, as one of the optimal bifunctional oxygen catalysts, are vital for cathodic oxygen electrode of Zn-based air flow batteries (ZAFBs). However, chemical complexity of M-N-C catalysts prepared via the traditional pyrolytic process increases the difficulties of precise control toward configuration and repeatability, especially in large-scale synthesis. Herein, a bifunctional oxygen catalyst via a pyrolysis-free approach based on closed pi-conjugated covalent organic polymers (COPs, microwave synthesis) is developed, which inherits the advantage of the well-defined configuration in an atomic manner. Profited from distinct catalytic centers and strong electronic coupling at the interface between COP and layered double hydroxides, the as-synthesized catalyst not only more easily permits large quantity production (>1 kg per batch), but also maintains an ultrahigh bifunctional activity and a long cycle stability even after scale synthesis (Delta E [Ej(10) - E-1/2] = 591 mV; energy efficiency drops by only 2.02% after 1200 cycles), which overwhelmingly exceeds the benchmark Pt/C+IrO2 and the state-of-the-art pyrolytic bifunctional M-N-C oxygen catalysts.
引用
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页数:9
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