磷酸根掺杂MnFe2O4及其赝电容特性

doi:10.15541/jim20200015

无机材料学报 ›› 2020, Vol. 35 ›› Issue (10): 1137-1141.DOI: 10.15541/jim20200015 CSTR: 32189.14.10.15541/jim20200015

所属专题：能源材料论文精选(二)：超级电容器与储能电池(2020)

磷酸根掺杂MnFe₂O₄及其赝电容特性

费明婕¹(),张任平²,朱归胜¹,俞兆喆¹,颜东亮¹()

^1. 桂林电子科技大学广西信息材料重点实验室, 桂林 541004
^2. 景德镇陶瓷大学材料科学与工程学院, 景德镇 333403

收稿日期:2020-01-09 修回日期:2020-02-26 出版日期:2020-10-20 网络出版日期:2020-03-05
作者简介:费明婕(1995-), 女, 硕士研究生. E-mail:mjfyjs@163.com。
基金资助:
国家自然科学基金(51974098);国家自然科学基金(51564006);国家自然科学基金(51764011);国家自然科学基金(21805055);广西自然科学基金(2017GXNSFDA198021);广西自然科学基金(AA17204063);广西自然科学基金(AD19110077)

Preparation and Pseudocapacitive Properties of Phosphate Ion-doped MnFe₂O₄

FEI Mingjie¹(),ZHANG Renping²,ZHU Guisheng¹,YU Zhaozhe¹,YAN Dongliang¹()

^1. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, China
^2. School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, China

Received:2020-01-09 Revised:2020-02-26 Published:2020-10-20 Online:2020-03-05
About author:FEI Mingjie(1995-), female, Master candidate. E-mail: mjfyjs@163.com
Supported by:
National Natural Science Foundation of China(51974098);National Natural Science Foundation of China(51564006);National Natural Science Foundation of China(51764011);National Natural Science Foundation of China(21805055);Natural Science Foundation of Guangxi(2017GXNSFDA198021);Natural Science Foundation of Guangxi(AA17204063);Natural Science Foundation of Guangxi(AD19110077)

摘要/Abstract

摘要：

采用水热法先合成MnFe₂O₄(MFO), 然后通过与PH₃反应制备了磷酸根离子掺杂的MnFe₂O₄(PMFO), 以提高它的电化学性能。研究结果表明, 磷酸根掺杂不仅增大了MnFe₂O₄的比表面积, 也增加了材料的电导性。在1 A/g电流密度下, PMFO比容量为750 F/g, 与MFO相比, 比电容提高了近70%, 同时循环稳定性也得到了极大改善。以PMFO为正极、活性碳为负极的非对称超级电容器(ASCs), 在功率密度为2.7 kW/kg时, 能量密度达到168.8 Wh/kg。因此, PMFO是有极大应用前景的超级电容器电极材料。

关键词: MnFe₂O₄, 磷酸根, 掺杂, 超级电容器

Abstract:

In order to improve the electrochemical performance, the phosphate ion doped MnFe₂O₄ (PMFO) was synthesized by a hydrothermal method combined with a subsequent phosphatization treatment. Both the specific surface area and electrical conductivity of electrode material are improved by the phosphate ion functionalization. Furthermore, the specific capacitance is 750 F/g at 1 A/g for PMFO, which is almost 1.7% higher than that of MFO. Besides, the cyclic stability of PMFO electrode is also improved. The asymmetric supercapacitors (ASCs) assembled by positive electrode PMFO and actived negative electrode carbon (AC) display an ultrahigh energy density of 168.8 Wh/kg at a power density of 2.7 kW/kg. The PMFO is demonstrated as a promising electrode material for supercapacitor applications.

Key words: MnFe₂O₄, phosphate ion, doping, supercapacitor

中图分类号:

TB34

费明婕, 张任平, 朱归胜, 俞兆喆, 颜东亮. 磷酸根掺杂MnFe₂O₄及其赝电容特性[J]. 无机材料学报, 2020, 35(10): 1137-1141.

FEI Mingjie, ZHANG Renping, ZHU Guisheng, YU Zhaozhe, YAN Dongliang. Preparation and Pseudocapacitive Properties of Phosphate Ion-doped MnFe₂O₄[J]. Journal of Inorganic Materials, 2020, 35(10): 1137-1141.

图/表 4

图1 MFO及PMFO的XRD图谱(a)、MFO (b)及PMFO (c)的扫描电镜照片

Fig. 1 XRD patterns of MFO and PMFO (a), and SEM images of MFO (b) and PMFO (c)

图2 掺杂前后样品的全谱图(a)、P2p (b)和O1s (c)的XPS图谱

Fig. 2 Survey (a), P2p(b) and O1s (c) of XPS spectra for MFO and PMFO

图3 MFO和PMFO的循环伏安(a)、恒流充放电(b)、阻抗分析(c)、循环寿命(d)和比容量与库伦效率(e)的电化学性能

Fig. 3 CV (a), CP (b), EIS (c), cycle life, (d) specific capacitance and coulombic efficiency (e) curves for MFO and PMFO

图4 PMFO//AC非对称超级电容器的PMFO与AC的CV曲线(a)、不同扫描速率的CV曲线(b)、不同电流密度的CP曲线(c)、循环性能曲线(d)和Ragone plots及与其他ASC对比图(e)

Fig. 4 CV curves of PMFO and AC (a); CV at different scan rates (b), CP at different densities (c), cyclic life (d) for PMFO//AC ASC, and Ragone plots and other previously reported ASCs (e)

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磷酸根掺杂MnFe₂O₄及其赝电容特性

Preparation and Pseudocapacitive Properties of Phosphate Ion-doped MnFe₂O₄

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