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发布日期:2018-02-26 浏览次数: 字号:[ ]

Cobalt doped nickel phosphite for high performance of electrochemical energy storage

Bing Li, Yuxin Shi, Kesheng Huang, Mingming Zhao, Jiaqing Qiu, Huaiguo Xue, Huan Pang*

School of Chemistry and Chemical Engineering, Yangzhou University

 

Abstract: Compared to single metallic Ni or Co phosphides, bimetallic Ni-Co phosphides own ameliorative properties, such as high electrical conductivity, remarkable rate capability, upper specific capacity, and excellent cycle performance. Here, a simple one-step solvothermal process is proposed for the synthesis of bouquet-like cobalt doped nickel phosphite (Ni11(HPO3)8(OH)6), and the effect of the structure on the pseudocapacitive performance is investigated via a series of  electrochemical measurements. We found that when the cobalt content is low, glycol/deionized water ratio is 1, reaction under 200 oC for 20 hours, the morphology of the sample is uniform and has the highest specific surface area. The cobalt doped Ni11(HPO3)8(OH)6 electrode presented a maximum specific capacitance of 714.8 F g-1. More significantly, aqueous and solid-state flexible electrochemical energy storage devices were successfully assembled. The aqueous device showed high energy density of 15.48 mWh cm-2 at the power density of 0.6 KW cm-2. The solid-state device showed high energy density of 14.72 mWh cm-2 at the power density of 0.6 KW cm-2. These excellent performances confirm that the cobalt doped Ni11(HPO3)8(OH)6 are promising materials for applications in electrochemical energy storage device.

Small, 2018, 201703811. IF = 8.643

文章链接:http://onlinelibrary.wiley.com/doi/10.1002/smll.201703811/full




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