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NiCo2S4 quantum dots with high redox reactivity for hybrid supercapacitors

文献类型：期刊论文

作者Chen, Wenyong1,2; Zhang, Xuemei2,3; Mo, Li-E1; Zhang, Yongsheng3; Chen, Shuanghong1; Zhang, Xianxi4; Hu, Linhua1
刊名CHEMICAL ENGINEERING JOURNAL
出版日期2020-05-15
卷号388
ISSN号1385-8947
关键词Bimetallic nickel cobalt sulfides Quantum dots High redox reactivity Hybrid supercapacitors High energy density
DOI10.1016/j.cej.2020.124109
通讯作者Mo, Li-E() ; Zhang, Yongsheng(yshzhang@theory.issp.ac.cn) ; Hu, Linhua(lhhu@rntek.cas.cn)
英文摘要Despite advances in the synthetic methodology and multi-dimensional morphology engineering of ternary nickel cobalt sulfides for supercapacitors electrode materials, the intrinsic incentive mechanism of nickel cobalt sulfides in elevating charge storage property still remains cryptic. Here, we successfully synthesized high quality NiCo2S4 quantum dots (QDs) with good monodispersity and size distribution. Combining DFT theoretical calculation with ex-situ XPS characterization results, we elucidate that the synergistic modulation between reactive Ni and Co donates more active electrons near the Fermi level, as well as advantageous reaction surface and decreased energy barrier. This synergistically enhanced reactivity boosts larger proportion of Ni and Co from the NiCo2S4 QDs involved in the redox reaction, contributing to more than three times augment in specific capacity over the NiS2 or CoS2 QDs. Meanwhile, electrochemical studies indicate that the structural superiorities of NiCo2S4 QDs accelerate ions diffusion and reaction kinetics. Benefiting from these aspects, a hybrid supercapacitor constructed by the NiCo2S4 QDs as cathode and nitrogen-doped reduced graphene oxide nanosheets as anode delivers an ultrahigh energy density of 67.5 Wh.kg(-1) at power density of 850 W.kg(-1), as well as excellent rate performance and robust cyclic stability.
WOS关键词GRAPHENE OXIDE COMPOSITE ; NICKEL NANOTUBE ARRAYS ; ELECTRODE MATERIALS ; NI FOAM ; ENERGY ; CARBON ; NANOSHEETS ; EFFICIENT ; CAPACITY ; DEVICES
资助项目National Key R&D Program of China[2017YFE0133800] ; National Natural Science Foundation of China[51961165106] ; National Natural Science Foundation of China[11774347] ; CASHIPS Director's Fund[YZJJ201902] ; CASHIPS Director's Fund[YZJJ2018QN21] ; Anhui Provincial Natural Science Foundation[1908085QB52] ; Colleges and universities in Shandong Province science and technology projects[J17KA097]
WOS研究方向Engineering
语种英语
出版者ELSEVIER SCIENCE SA
WOS记录号WOS:000533524200006
资助机构National Key R&D Program of China ; National Natural Science Foundation of China ; CASHIPS Director's Fund ; Anhui Provincial Natural Science Foundation ; Colleges and universities in Shandong Province science and technology projects
源URL[http://ir.hfcas.ac.cn:8080/handle/334002/103245]  
专题中国科学院合肥物质科学研究院
通讯作者Mo, Li-E; Zhang, Yongsheng; Hu, Linhua
作者单位1.Chinese Acad Sci, Inst Appl Technol, Hefei Inst Phys Sci, Key Lab Photovolta & Energy Conservat Mat, Hefei 230088, Anhui, Peoples R China
2.Univ Sci & Technol China, Hefei 230026, Peoples R China
3.Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Peoples R China
4.Liaocheng Univ, Technol Sch Chem & Chem Engn, Shandong Prov Key Lab, Collaborat Innovat Ctr Chem Energy Storage & Nove, Liaocheng 252000, Shandong, Peoples R China
推荐引用方式
GB/T 7714		 Chen, Wenyong,Zhang, Xuemei,Mo, Li-E,et al. NiCo2S4 quantum dots with high redox reactivity for hybrid supercapacitors[J]. CHEMICAL ENGINEERING JOURNAL,2020,388.
APA Chen, Wenyong.,Zhang, Xuemei.,Mo, Li-E.,Zhang, Yongsheng.,Chen, Shuanghong.,...&Hu, Linhua.(2020).NiCo2S4 quantum dots with high redox reactivity for hybrid supercapacitors.CHEMICAL ENGINEERING JOURNAL,388.
MLA Chen, Wenyong,et al."NiCo2S4 quantum dots with high redox reactivity for hybrid supercapacitors".CHEMICAL ENGINEERING JOURNAL 388(2020).

入库方式： OAI收割

来源：合肥物质科学研究院

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