Rose-like Ni3S4 as battery-type electrode for hybrid supercapacitor with excellent charge storage performance

Rose-like Ni3S4 as battery-type electrode for hybrid supercapacitor with excellent charge storage performance
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玫瑰状Ni3S4作为混合超级电容器电池型电极,具有优异的电荷存储性能

DOI:
10.1016/j.cej.2018.05.004
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发表时间:
2018-10
影响因子:
15.1
通讯作者:
孙占波
孙占波
中科院分区:
工程技术1区
文献类型:
--
作者:
王海洋;梁苗苗;段栋;时文宇;宋衍滟;孙占波

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采用两步水热法成功地合成了玫瑰状的Ni3S4微花。用X射线衍射仪、扫描电子显微镜和透射电子显微镜对合成的Ni3S4的尖晶石结构和玫瑰花样形貌进行了表征。循环伏安和恒流充放电测试表明,电池的电化学性能有所改善。当电流密度为1797.5.5A g−1时,Ni3S4微花显示出约1797.5 Fg−1的增强伪电容性能,动力学分析表明Ni3S4具有扩散控制的法拉第特性(电容贡献为28.66%).以Ni3S4为正极,以活性碳(AC)为负极,成功组装了一种混合型超级电容器。Ni3S4//AC器件表现出相对较高的能量密度,最大功率密度为1500.2 W kg−1,18.625 WH kg−1,以及出色的循环性能(在5,000次循环中保持约93%的电容)。
Rose-like Ni3S4 microflflowers are successfully synthesized by a novel two-step hydrothermal technique. X-ray diffffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) characterization are used to identify the spinel structure and rose-like morphology of the synthesized Ni3S4. The cyclic voltammetry and galvanostatic charge–discharge tests demonstrate improved electrochemical performance. The Ni3S4 microflflower shows enhanced pseudocapacitive performance of approximately 1797.5 F g−1 at a current density of 0.5 A g−1 , and the kinetic analysis reveals a diffffusion controlled faradaic characteristic of Ni3S4 (28.66% capacitive contributions). Moreover, a hybrid supercapacitor is successfully assembled with Ni3S4 as the positive electrode and active carbon (AC) as the negative electrode. The Ni3S4//AC device exhibits a relatively high energy density of 18.625 Wh kg−1 , a maximum power density of 1500.2 W kg−1 as well as an excellent cycling performance (approximately 93% capacitance retention over 5000 cycles).
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