<strong>rGO/PANI/MnO<sub>2</sub></strong> 三元复合材料的制备和电化学性能

doi:10.11901/1005.3093.2021.431

材料研究学报

2022, Vol. 36

Issue (7): 552-560 DOI: 10.11901/1005.3093.2021.431

研究论文

本期目录 | 过刊浏览

rGO/PANI/MnO₂ 三元复合材料的制备和电化学性能

刘艳云(

), 刘宇涛, 李万喜

晋中学院材料科学与工程系晋中 030619

Preparation and Electrochemical Performance of rGO/PANI/MnO₂ Ternary Composites

LIU Yanyun(

), LIU Yutao, LI Wanxi

Department of Materials Science and Engineering, Jinzhong University, Jinzhong 030619, China

引用本文:

刘艳云, 刘宇涛, 李万喜. rGO/PANI/MnO₂ 三元复合材料的制备和电化学性能[J]. 材料研究学报, 2022, 36(7): 552-560.
Yanyun LIU, Yutao LIU, Wanxi LI. Preparation and Electrochemical Performance of rGO/PANI/MnO₂ Ternary Composites[J]. Chinese Journal of Materials Research, 2022, 36(7): 552-560.

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摘要:

用水热合成法和冻干操作制备石墨烯/聚苯胺/二氧化锰三元复合材料(rGO/PANI/MnO₂),使用X射线衍射(XRD)、X射线光电子能谱(XPS)和扫描电子显微镜(SEM)对其进行了表征。结果表明,用这种简单高效的方法制备的复合材料,具有相互交联的网络状结构和自支撑特性。在反应过程中MnO₂与聚苯胺形成不规则的块状结构,共沉积在石墨烯自组装形成的网络片层上。这种复合材料具有良好的电容性能,比电容为388 F·g^-1(0.5 A·g^-1),优于单纯的石墨烯(rGO,234 F·g^-1)和聚苯胺电极(PANI,176 F·g^-1)。使用这种复合材料作为正极、rGO作为负极组装的一种不对称超级电容器,能在0~1.6 V范围内可逆循环,功率密度为17.48 W·kg^-1时最大能量密度为13.5 Wh·kg^-1。

关键词 ：复合材料, 石墨烯, 水热法, 电化学性能

Abstract：

Graphene/polyaniline/manganese dioxide ternary composites (rGO/PANI/MnO₂) were prepared by hydrothermal method, followed by freeze-dried in vacuum treatment in this paper. The composites prepared by this simple and efficient method had self-supporting properties. The composites were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). The results show that the prepared ternary composites had an interconnected network structure. During the reaction MnO₂ and polyaniline formed an irregular block structure and co-deposited on the network layer formed by graphene self-assembly. The composite electrode showed good capacitive properties, with a specific capacitance of 388 F·g^-1 (0.5 A·g^-1), which was better than that of graphene (rGO, 234 F·g^-1) and polyaniline (PANI, 176 F·g^-1). In addition, an asymmetric supercapacitor was assembled using the composite as the positive electrode and rGO as the negative electrode. The asymmetric capacitor could be reversibly cycled in the range of 0~1.6 V. When the power density was 17.48 W·kg^-1, the maximum energy density could reach 13.5 Wh·kg^-1.

Key words： composite graphene hydrothermal method electrochemical properties

收稿日期: 2021-08-13

ZTFLH:

TB383

基金资助:山西省高校科技创新项目(2020L0576);山西省“1331工程”重点创新团队(PY201817);晋中学院“1331工程”重点创新团队(jzxycxtd2019005);轻质材料改性应用协同创新中心(jzxyxtcxzx202103)

作者简介: 刘艳云,女,1984年生,博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2021.431 或 https://www.cjmr.org/CN/Y2022/V36/I7/552

图1 三元复合材料和GO与rGO的 XRD 谱

图2 rGO/PANI/MnO2-3三元复合材料的XPS谱

图3 rGO/PANI/MnO2-3的SEM照片

图4 rGO、PANI与rGO/PANI/MnO2-3在扫速为2 mV/s下的CV曲线,rGO、PANI和rGO/PANI/MnO2-3在电流密度为0.2 A·g-1时的CP曲线以及rGO、PANI与rGO/PANI/MnO2-3的EIS图(插图表示高频区域的曲线)

图5 三种复合材料在扫速为2 mV/s下的CV曲线,rGO/PANI/MnO2-3复合材料在不同扫描速率下的CV曲线和扫速为5 mV/s下的电容控制贡献以及 rGO/PANI/MnO2-3复合材料在不同扫速下的电容控制与扩散控制贡献率

图6 三种复合材料在电流密度为0.2 A·g-1时的CP曲线,rGO/PANI/MnO2-3复合材料在不同电流密度下的CP曲线,rGO/PANI/MnO2-3复合材料Ce与电流密度的关系以及三种复合材料的EIS图

图7 不对称超级电容器在扫速为10 mV/s时不同电位窗口的CV曲线,不同扫速的CV曲线,1 A·g-1时不同电位窗口下的CP曲线,在不同电流密度下的CP曲线,能量密度与功率密度的关系以及容量保留值与循环次数的关系

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