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Highly Dispersive Co@N-C Catalyst as Freestanding bifunctional cathode for Flexible and Rechargeable Zinc–air Batteries

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Energy & Environmental Materials 2022年第2期5卷 543-554页

作者： Yu Ma Ding Chen Weijun Li Yapeng Zheng Lin Wang Gang Shao Qiao Liu Weiyou Yang College of Materials Science and Engineering Hunan UniversityChangsha 410082China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082China Institute of Materials Ningbo University of TechnologyNingbo 315211China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

The design of efficient cathode with great cycle performance,high flexibility,and low cost is essential for the commercialization of zinc–air battery(ZAB).Herein,we report the exploration of freestanding bifunctional cathode with rationally designed structures,namely,tiny Co nanoparticles embedded in Ndoped carbon nanofiber aerogels,which have desired features including uniform Co dispersity,balanced distribution of N-C species,hierarchically porous structure with increased fraction of meso-to micropores,and moderate amounts of ***,the as-fabricated cathodes exhibit positive half-wave potential of 0.82 V for oxygen reduction and small overpotential of 350 mV at 10 mA cm^(−2) for oxygen evolution,respectively,which deliver smaller reversible oxygen electrode index(0.76 V)than the commercial Pt/C+RuO_(2)(0.80 V)and most Co-based electrocatalysts ever ***,the as-constructed liquid rechargeable ZAB behaves high peak power density(160 mW cm^(−2)),large specific capacity(759.7 mAh g^(−1) at 10 mA cm^(−2),tested after 120 h of OCV tests),and robust stability over 277 ***,the as-assembled quasi-solid-state ZAB using such freestanding cathode represents excellent mechanical flexibility and outstanding cycle performance,regardless of being serviced under extremely bending conditions from 0°to 180°,underscoring their promising applications as durable bifunctional cathode for portable metalair batteries.

关键词： bifunctional cathode carbon nanofiber aerogels Co nanoparticles freestanding cathode zinc-air batteries

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Facile Route to Constructing Ternary Nanoalloy bifunctional Oxyegn cathode for Metal-Air Batteries

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Chemical Research in Chinese Universities 2020年第6期36卷 1153-1160页

作者： WANG Huanfeng LI Junfeng LI Fei LI Jingjing XU Jijing College of Chemical and Food Zhengzhou University of TechnologyZhengzhou 450044P.R.China State Key Laboratory of Inorganic Synthesis&Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012P.R.China International Center of Future Science Jilin UniversityChangchun 130012P.R.China

Highly stable and efficient bifunctional air cathode catalyst is crucial to rechargeable metal-air ***,a ternary nanoalloy layer composed of noble and base metal coated on a three-dimensional porous Ni sponge as the bifunctional cathode is synthesized through in-situ anchoring strategy,which can effectively keep the multimetal nanoparticles from agglomeration and improve the density of active sites and catalytic *** prepared catalyst displays an excellent catalytic performance with lower overpotential and long-term *** Zn-air batteries with the as-prepared cathodes possess a large power density of 170 mW/cm2,long cycling stability up to 230 cycles,and a high specific capacity of 771 mA h/***,the corresponding Li-air batteries deliver a discharge capacity of 22429 mA h/*** superior properties of the metal-air batteries can be attributed to the combined influence of design and composition of electrode,which is of great significance to improve the electrochemical catalytic activity,providing great potential of wide application in expanded rechargeable energy systems.

关键词： Metal-air battery bifunctional cathode Self-standing Nanosheet Electrochemical performance

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