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电化学(中英文) ›› 2019, Vol. 25 ›› Issue (6): 740-748.  doi: 10.13208/j.electrochem.180625

• 研究论文 • 上一篇    下一篇

ZnCo2O4电极材料的形貌调控制备与超级电容特性的研究

周岳珅1,李 梦1,吴 双1,李照磊1,2*,高延敏1*   

  1. 1. 江苏科技大学材料科学与工程学院,江苏 镇江 212003;2. 南京大学材料科学和工程系,江苏 南京 210093
  • 收稿日期:2018-06-25 修回日期:2018-07-12 出版日期:2019-12-28 发布日期:2019-12-28
  • 通讯作者: 李照磊 E-mail:JKDGaoyanmin@163.com; zllinju@126.com
  • 基金资助:

Morphology Controlled Preparations and Electrochemical Properties of ZnCo2O4 Electrode Materials for Supercapacitors

ZHOU Yue-shen1, LI Meng1, WU Shuang1, LI Zhao-lei1,2*, GAO Yan-min1*   

  1. 1. School of Materials Science and Engineering, Jiangsu University of Science and Technology,Zhenjiang 212003, Jiangsu, China; 2. Department of material science and engineering,Nanjing university, Nanjing 210093, Jiangsu, China
  • Received:2018-06-25 Revised:2018-07-12 Published:2019-12-28 Online:2019-12-28
  • Contact: LI Zhao-lei E-mail:JKDGaoyanmin@163.com; zllinju@126.com

摘要: 本文采用水热反应和高温将ZnCo2O4纳米活性材料原位生长在泡沫镍上,并通过控制前驱体溶液中NH4F的添加量,获得了ZnCo2O4四种不同的形貌. 以ZnCo2O4-2/NF为正极,AC/NF为负极,组装得到纽扣式非对称超级电容器ZnCo2O4-2/NF//AC/NF. 通过X射线衍射(XRD)、场发射扫描电镜(FESEM)、透射电镜(TEM)等方法对四种形貌ZnCo2O4的组成和结构进行了分析. 在三电极体系下对不同形貌的ZnCo2O4电极进行循环伏安、恒流充放电以及电化学阻抗测试. 结果表明,当NH4F的添加量为5 mmol时,所获得的薄纳米线团簇具有最高的面积比容量. 在电流密度为5 mA·cm-2下,比容量为2.77 F·cm-2. 基于正负两个电极的总面积,纽扣式非对称超级电容器的最大能量密度达到114.49 μWh·cm-2,相应的功率密度达到4001.59 μW·cm-2. 同时,功率密度达到24000 μW·cm-2时,对应的能量密度为80 μWh·cm-2.

关键词: 钴酸锌, 氟化铵, 面积比容量, 非对称超级电容器

Abstract: In this work, hydrothermal reaction and high temperature were used to grow ZnCo2O4 active materials on Ni foam. The crystal stuctures and surface morphlogies of four samples were investigated by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). The electrochemical performances were characterized by cyclic voltammetry (CV)、galvanostatic charge/discharge (GCD) testing and electrochemical impedance spectroscopy (EIS) on an electrochemical station. It can be seen that active materials tended to form denser stuctures with an increasing amount of NH4F in the solution system and four different morphologies of ZnCo2O4  were obtained: nanoneedles, thin nanoneedles-clusters, thick nanoneedles-clusters, and lozenge-like bulks.ZnCo2O4 with the thin nanoneedles-clusters morphology held the best electrochemaical performance with the capacitance of 2.77 F·cm-2 at the current density of 5 mA·cm-2. A button asymmetric supercapacitor (ZnCo2O4 -2/NF//AC/NF) assembled with ZnCo2O4 -2/NF and AC/NF exhibited the excellent performance in energy storage. The button asymmetric supercapacitors achieved an energy density of 114.49 μWh·cm-2 at power density of 4001.59 μW·cm-2 and a power density of 24000 μW·cm-2 at energy density of 80 μWh·cm-2.

Key words: zinc cobaltate, ammonium fluoride, areal capacitance, asymmetric supercapacitors

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