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Graphitic Carbon Quantum Dots Modified Nickel Cobalt Sulfide as Cathode Materials for Alkaline Aqueous Batteries

查看全文 作　　者：Yirong [1]Zhu;Jingying [1]Li;Xiaoru [1]Yun;Ganggang [2]Zhao;Peng [2]Ge;Guoqiang [2]Zou;Yong [3]Liu;Hongshuai [2]Hou;Xiaobo [2]Ji 高影响力作者 机构地区：[1]College of Metallurgy and Material Engineering,Hunan University of Technology,Zhuzhou 412007,People’s Republic of China;[2]College of Chemistry and Chemical Engineering,Central South University,Changsha 410083,People’s Republic of China;[3]State Key Lab of Powder Metallurgy,Central South University,Changsha 410083,People’s Republic of China高影响力机构 出　　处：《Nano-Micro Letters》索引2020年第12卷第2期,共18页高影响力期刊 基　　金：financially supported by National Natural Science Foundation of China(21601057);Hunan Provincial Natural Science Foundation of China(2018JJ3116);Excellent Youth Fund of Hunan Provincial Education Department(18B298) 摘　　要：Carbon quantum dots(CQDs)as a new class of emerging materials have gradually drawn researchers’concern in recent years.In this work,the graphitic CQDs are prepared through a scalable approach,achieving a high yield with more than 50%.The obtained CQDs are further used as structure-directing and conductive agents to synthesize novel N,S-CQDs/NiCo2S4 composite cathode materials,manifesting the enhanced electrochemical properties resulted from the synergistic effect of highly conductive N,S-codoped CQDs offering fast electronic transport and unique micro-/nanostructured NiCo2S4 microspheres with Faradaic redox characteristic contributing large capacity.Moreover,the nitrogen-doped reduced graphene oxide(N-rGO)/Fe2O3 composite anode materials exhibit ultrahigh specific capacity as well as significantly improved rate property and cycle performance originating from the high-capacity prism-like Fe2O3 hexahedrons tightly wrapped by highly conductive N-rGO.A novel alkaline aqueous battery assembled by these materials displays a specific energy(50.2 Wh kg^−1),ultrahigh specific power(9.7 kW kg^−1)and excellent cycling performance with 91.5%of capacity retention at 3 A g^−1 for 5000 cycles.The present research offers a valuable guidance for the exploitation of advanced energy storage devices by the rational design and selection of battery/capacitive composite materials. 关 键 词：Energy storage Alkaline aqueous batteries Carbon quantum dot Nickel cobalt sulfide
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