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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Microwave synthesis of sodium nickel-cobalt phosphates as high-performance electrode materials for supercapacitors
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Microwave synthesis of sodium nickel-cobalt phosphates as high-performance electrode materials for supercapacitors

机译：微波合成钠镍钴磷酸盐作为超级电容器的高性能电极材料

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摘要

The abundant and low-cost transition metal phosphates are considered to be promising supercapacitor electrode materials. In this study, sodium nickel-cobalt phosphates were fabricated via a facile microwave synthesis method and used as a high-magnification electrode material for asymmetric supercapacitors. The effect of the ratio of Co and Ni was investigated, and the palmary electrochemical performance was found in NaNi0.33Co0.67PO4 center dot H2O with the specific capacitance of 828 F g(-1) at 1 A g(-1). When the discharge current density is 10 A g(-1), the capacitance retention rate is 88.7% and the cycle stability is good with remaining 81.3% after 3000 cycles at 5 A g(-1). Furthermore, an asymmetric supercapacitors (ASCs) with graphene as negative electrode material and NaNi0.33Co0.67PO4 center dot H2O as positive electrode material was also successfully constructed, when the power density is 374.95 W kg(-1), the energy density is as high as 29.85 Wh kg(-1). Even at a power density of 7500 W kg(-1), the energy density can reach 24.375 Wh kg(-1), and the high capacitance retention after 10,000 cycles is 76.9%. (C) 2019 Elsevier B.V. All rights reserved.
机译：丰富和低成本的过渡金属磷酸盐被认为是有前途的超级电容器电极材料。在该研究中，通过容易的微波合成方法制造钠 - 钴磷酸酯，并用作不对称超级电容器的高倍率电极材料。研究了CO和Ni的比例的效果，并且在纳米0.33CO0.67PO4中心点H2O中发现了掌上电化学性能，其特定电容为828fg（-1），1ag（-1）。当放电电流密度为10Ag（-1）时，电容保持率为88.7％，并且循环稳定性良好，在5Ag（-1）下3000次循环后剩余81.3％。此外，作为负极材料和纳米0.33CO0.67PO4中心点H2O作为正极材料的非对称超级电容器（ASCS）也被成功地构建，当功率密度为374.95Wkg（-1）时，能量密度如高达29.85 WH kg（-1）。即使在7500W千克（-1）的功率密度，能量密度也可以达到24.375WHKG（-1），10,000个循环后的高电容保留为76.9％。 （c）2019 Elsevier B.v.保留所有权利。

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