Modulating Mn4+ Ions and Oxygen Vacancies in Nonstoichiometric LaMnO3 Perovskite by a Facile Sol-Gel Method as High-Performance Supercapacitor Electrodes

被引：114

作者：

Elsiddig, Zuhair Agab ^{[1
,2
]}

Xu, Hui ^{[1
]}

Wang, Dan ^{[1
]}

Zhang, Wei ^{[1
]}

Guo, Xinli ^{[1
]}

Zhang, Yao ^{[1
]}

Sun, Zhengming ^{[1
]}

Chen, Jian ^{[1
]}

机构：

[1] Southeast Univ, Jiangsu Key Lab Adv Met Mat, Sch Mat Sci & Engn, Nanjing, Jiangsu, Peoples R China

[2] Karary Univ, Dept Mech Engn, Khartoum, Sudan

来源：

ELECTROCHIMICA ACTA | 2017年 / 253卷

关键词：

LaMnO3; Perovskite; nonstoichiometric; oxygen vacancy; supercapacitor; ELECTROCHEMICAL PROPERTIES; NICKEL FOAM; NANOFIBERS; MORPHOLOGY; COMPOSITE; STORAGE; SR;

D O I：

10.1016/j.electacta.2017.09.076

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

A series of LaMn1-xO3 perovskite (x = 0, 0.05, 0.1) has been synthesized via a facile sol-gel method and applied as supercapacitor electrodes. The morphology, phase structure, composition, chemical states of constituents and electrochemical properties are investigated. As a result, all the LaMn1-xO3 samples revealed a single mesoporous phase of perovskite with typical pore sizes from 2 to 5 nm. The nonstoichiometric LaMn1.1O3 sample showed much higher specific capacity (202.1 mAhg(-1)/727.6Cg(-1) at 1 Ag-1) than stoichiometric LaMnO3 perovskite (114.4 mAhg(-1)/411.8Cg(-1) at 1 Ag-1). Detailed chemical analysis demonstrated that the presence of point defects such as oxygen and cation vacancies, and a high Mn4+/Mn3+ ratio contributed to the excellent electrochemical performance. Furthermore, the cycle stability analyses of the LaMn1-xO3 perovskite revealed that LaMn1.1O3 manifested an exceptionally high rate capability. These results prove that nonstoichiometric LaMn1.1O3 can be a promising material for supercapacitor electrodes. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：422 / 429

页数：8

共 37 条

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