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Ultrathin Nickel–Cobalt Phosphate 2D Nanosheets for Electrochemical Energy Storage under Aqueous/Solid‐State Electrolyte
Author(s) -
Li Bing,
Gu Peng,
Feng Yongcheng,
Zhang Guangxun,
Huang Kesheng,
Xue Huaiguo,
Pang Huan
Publication year - 2017
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201605784
Subject(s) - materials science , nickel , cobalt , electrochemistry , aqueous solution , chemical engineering , energy storage , electrolyte , power density , supercapacitor , nanotechnology , inorganic chemistry , electrode , metallurgy , organic chemistry , chemistry , power (physics) , physics , quantum mechanics , engineering
2D materials are ideal for constructing flexible electrochemical energy storage devices due to their great advantages of flexibility, thinness, and transparency. Here, a simple one‐step hydrothermal process is proposed for the synthesis of nickel–cobalt phosphate 2D nanosheets, and the structural influence on the pseudocapacitive performance of the obtained nickel–cobalt phosphate is investigated via electrochemical measurement. It is found that the ultrathin nickel–cobalt phosphate 2D nanosheets with an Ni/Co ratio of 4:5 show the best electrochemical performance for energy storage, and the maximum specific capacitance up to 1132.5 F g −1 . More importantly, an aqueous and solid‐state flexible electrochemical energy storage device has been assembled. The aqueous device shows a high energy density of 32.5 Wh kg −1 at a power density of 0.6 kW kg −1 , and the solid‐state device shows a high energy density of 35.8 Wh kg −1 at a power density of 0.7 kW kg −1 . These excellent performances confirm that the nickel–cobalt phosphate 2D nanosheets are promising materials for applications in electrochemical energy storage devices.