ZnCo2O4电极材料的形貌调控制备与超级电容特性的研究

doi:10.13208/j.electrochem.180625

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

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. 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:
无

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

ZHOU Yue-shen¹, LI Meng¹, WU Shuang¹, LI Zhao-lei^1,2*, GAO Yan-min^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/Abstract

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

中图分类号:

O646
O644

周岳珅, 李梦, 吴双, 李照磊, 高延敏. ZnCo₂O₄电极材料的形貌调控制备与超级电容特性的研究[J]. 电化学（中英文）, 2019, 25(6): 740-748.

ZHOU Yue-shen, LI Meng, WU Shuang, LI Zhao-lei, GAO Yan-min. Morphology Controlled Preparations and Electrochemical Properties of ZnCo₂O₄ Electrode Materials for Supercapacitors[J]. Journal of Electrochemistry, 2019, 25(6): 740-748.

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ZnCo₂O₄电极材料的形貌调控制备与超级电容特性的研究

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

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