Mn3O4 nanoparticles encapsulated in carbon cages as the electrode of dual-mechanism supercapacitors

被引：26

作者：

Camacho, R. A. Paredes ^{[1
]}

Wu, A-M ^{[1
]}

Gao, S. ^{[1
]}

Jin, X-Z ^{[1
]}

Cao, G-Z ^{[1
,2
]}

Huang, H. ^{[1
]}

机构：

[1] Dalian Univ Technol, Sch Mat Sci & Engn, Minist Educ, Key Lab Mat Modificat Laser Ion & Electron Beams, Dalian 116024, Peoples R China

[2] Univ Washington, Dept Mat Sci & Engn, Seattle, WA 98195 USA

来源：

MATERIALS TODAY CHEMISTRY | 2019年 / 12卷

基金：

中国国家自然科学基金;

关键词：

Core-shell; Dual-mechanism; Mn3O4; Supercapacitors; ONE-STEP SYNTHESIS; ONE-POT SYNTHESIS; HYDROTHERMAL SYNTHESIS; GRAPHENE OXIDE; POROUS MN3O4; ELECTROCHEMICAL SUPERCAPACITOR; CAPACITIVE PERFORMANCE; MANGANESE; STORAGE; NANOCOMPOSITE;

D O I：

10.1016/j.mtchem.2019.04.003

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

This article reports the production of Mn3O4@C nanocomposites as electrodes for high-performance supercapacitor applications. A facile and low-cost synthesis method combining DC arc discharge and annealing in air at different temperatures is used. The influence of the oxidation temperatures on product microstructure and electrochemical performance is studied in detail. The Mn3O4@C nanocomposite obtained under 200 degrees C annealing owns the highest specific capacitance of 422 Fe-l, with a specific energy density of 36 Whkg(-1) and excellent stability after 1000 cycles. The enhanced electrochemical response is attributed to a well-defined core-shell structure that has a defect-enriched carbon shell and pseudocapacitive Mn3O4 core. Carbon promotes the ion exchange with electric double-layer capacitance, while Mn3O4 contributes the pseudocapacitance during its faradaic redox reactions. (C) 2019 Elsevier Ltd. All rights reserved.

引用

页码：361 / 372

页数：12

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