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Synergetic ternary metal oxide nanodots-graphene cathode for high performance zinc energy storage

Chinese Chemical Letters 2020年第9期31卷 2358-2364页

作者： Lijun Su Lingyang Liu Yue Wang Yulan Lu Xingbin Yan Laboratory of Clean Energy Chemistry and Materials Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China School of Physical Science and Technology Lanzhou UniversityLanzhou 730000China Dalian National Laboratory for Clean Energy Chinese Academy of SciencesDalian 116023China

zinc-based electrochemistry ene rgy sto rage with high safety and high theoretical capacity is considered to be a competitive candidate to replace lithium-ion *** electrochemical energy storage,multimetal oxide cathode materials can generally provide a wider electrochemical stability window and a higher capacity compared with single metal oxides ***,a new type of cathode material,MnFe2Co3O8 nanodots/functional graphene sheets,is designed and used for aqueous hybrid Zn-based energy *** with a hybrid electrolyte based on zinc sulfate and potassium hydroxide,the asfabricated battery was able to work with a wide electrochemical window of 0.1~1.8 V,showed a high specific capacity of 660 mAh/g,delivered an ultra high energy density of 1135 Wh/kg and a scalable power density of 5754 W/kg(calculated based on the cathode),and displayed a long cycling life of 1000 *** are mainly attributed to the valence charge density distribution in MnFe2Co3O8 nanodots,the good structural strengthening as well as high conductivity of the cathode,and the right *** cathode material also exhibited high electrocatalytic activity for oxygen evolution reaction and thus could be used for constructing a Zn-air battery with an ultrahigh reversible capacity of 9556 mAh/g.

关键词： hybrid zinc battery Cathode Ternary metal oxide Energy storage Electrochemical performance

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