Pseudocapacitive Co9S8/graphene electrode for high-rate hybrid supercapacitors
Pseudocapacitive Co9S8/graphene electrode for high-rate hybrid supercapacitors
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DOI：
10.1016/j.carbon.2018.09.044
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发表时间：
2019-01-01
期刊：
影响因子：
10.9
通讯作者：
Liu, Jian
中科院分区：
文献类型：
--
作者：
Xie, Bingqiao;Yu, Mengying;Liu, Jian
钴镍黄铁矿（Co 9 S8）最近成为一种有前途的电极材料的能量存储设备。本文通过简单的水热法合成了Co 9 S8/石墨烯杂化材料。在石墨烯片的表面上精细沉积小尺寸的Co 9 S8薄片，并获得互连的Co 9 S8/石墨烯架构结构。电化学测试结果表明，Co 9 S8/石墨烯电极在1 min内的充电容量达到540 C g（-1），在14 s的放电时间内保持了74.5%的容量。组装有Co 9 S8参与的电极的混合超级电容器在170 W kg（-1）的功率密度下提供37 Wh kg（-1）的高能量密度，并且即使在12 kW kg（-1）的高功率密度下也可以保持15.3 Wh kg（-1）。Co 9 S8/石墨烯电极的优异电化学性能主要归功于其丰富的活性中心、增强的电荷转移特性和最大化的电容贡献。(C)2018爱思唯尔有限公司版权所有。
Cobalt pentlandite (Co9S8) has recently emerged as a promising electrode material for energy storage devices. Herein, Co9S8/graphene hybrid is rationally synthesized through a facile hydrothermal method. Minor-sized Co9S8 flakes is finely-deposited on the surface of graphene sheet and an interconnected Co9S8/graphene architecture structure is obtained. The electrochemical test results show that Co9S8/graphene electrode delivers a remarkable charge capacity of 540 C g(-1) within 1 min and 74.5% capacitance is retained within a discharge time of 14 s. A hybrid supercapacitor assembled with Co9S8-involved electrode delivers a high energy density of 37 Wh kg(-1) at a power density of 170 W kg(-1), and 15.3 Wh kg(-1) can be maintained even at a high power density of 12 kW kg(-1). The excellent electrochemical performance should be attributed to abundant active sites, enhanced charge-transfer characters and maximized capacitive contribution of Co9S8/graphene electrode. (C) 2018 Elsevier Ltd. All rights reserved.