Hierarchical MnO2/hollow carbon spheres composites for asymmetric supercapacitors with enhanced performance

被引：16
作者：
Wang, Guosheng [1 ,2 ]
Xu, Kuangliang [1 ,2 ]
Yan, Zhaoxiong [1 ,2 ]
Wang, Geming [3 ]
Xiang, Ming [4 ]
Xu, Zhihua [1 ,2 ]
机构：
[1] Jianghan Univ, State Key Lab Precis Blasting, Wuhan 430056, Peoples R China
[2] Jianghan Univ, Hubei Key Lab Ind Fume & Dust Pollut Control, Wuhan 430056, Peoples R China
[3] Wuhan Inst Technol, Sch Mat Sci & Engn, Wuhan 430205, Peoples R China
[4] Jianghan Univ, Key Lab Optoelect Chem Mat & Devices, Minist Educ, Wuhan 430056, Peoples R China
来源：
JOURNAL OF APPLIED ELECTROCHEMISTRY | 2022年 / 52卷 / 06期
基金：
中国国家自然科学基金;
关键词：
Hollow carbon spheres; MnO2; Electrode materials; Asymmetric supercapacitors; MICROWAVE-ASSISTED SYNTHESIS; ELECTROCHEMICAL PERFORMANCE; MNO2; NANOSHEETS; HOLLOW MICROSPHERES; FACILE SYNTHESIS; GRAPHENE OXIDE; ELECTRODE; FORMALDEHYDE; ALPHA-MNO2; OXIDATION;
D O I：
10.1007/s10800-022-01688-9
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
MnO2 nanoflakes anchored on hollow carbon spheres (MnO2/HCSs) were obtained via the first synthesis of HCSs and subsequent hydrothermal deposition of MnO2. The as-prepared MnO2/HCSs nanostructures were investigated as electrode materials of asymmetric supercapacitors. MnO2/HCSs (MnO2/HCSs-30) prepared from 30 mM of KMnO4 exhibited an impressive performance with a specific capacitance of 209 F g(-1) at 0.2 A g(-1) in a three-electrode system. The asymmetric supercapacitors device consisting of MnO2/HCSs-30 as a positive electrode and HCSs as a negative electrode displayed a high energy density of 26.8 W h kg(-1) at the power density of 170.0 W kg(-1) and still maintained 5.0 W h kg(-1) at the power density of 4285.7 W kg(-1). This result manifests that MnO2/HCSs could be a potential supercapacitor electrode material due to the in-situ immobilization of MnO2 nanoflakes on the functional carbon framework and facile tailoring of the ratio of MnO2 and HCSs in the nanohybrids.
引用
收藏
页码：963 / 978
页数：16
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