Zhi, Jian and Reiser, Oliver and Wang, Youfu and Hu, Aiguo (2016) A high performance flexible all solid state supercapacitor based on the MnO2 sphere coated macro/mesoporous Ni/C electrode and ionic conducting electrolyte. NANOSCALE, 8 (23). pp. 11976-11983. ISSN 2040-3364, 2040-3372
Full text not available from this repository. (Request a copy)Abstract
A high contact resistance between the active materials and the current collector, a low ionic conductivity of the gel electrolyte, and an impenetrable electrode structure are the three major barriers which greatly limit the capacitance of MnO2 in solid state supercapacitors. As a potential solution to these problems, in this work we report a novel electrode for solid state supercapacitors, based on a ternary system composed of hierarchical MnO2 spheres as the active material, macroporous Ni foam as gel penetrable skeletons and an ordered mesoporous carbon (OMC) membrane as the charge-transport accelerating layer. By employing butyl-3-methylimidazolium chloride (BMIMCl) modified gels as the ionic conducting electrolyte, the utilization efficiency of MnO2 on the specific capacitance was enhanced up to 88% of the theoretical value, delivering a volumetric capacitance of 81 F cm(-3), which is the highest value among MnO2 based solid state supercapacitors. Moreover, such a flexible device exhibits exceptional volumetric energy and power density (6.6 Wh L-1 and 549 W L-1, based on the whole device volume) combined with a small capacity loss of 8.5% after 6000 cycles under twisting. These encouraging findings unambiguously overcome the energy bottleneck of MnO2 in solid state supercapacitors, and open up a new application of macro/mesoporous materials in flexible devices.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ELECTROCHEMICAL ENERGY-STORAGE; ASYMMETRIC SUPERCAPACITORS; MESOPOROUS CARBON; THIN-FILM; NANOWIRE ARRAYS; NANOTUBES; GRAPHENE; OXIDE; NANOPARTICLES; EFFICIENT; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Organische Chemie > Lehrstuhl Prof. Dr. Oliver Reiser |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 22 Mar 2019 08:01 |
| Last Modified: | 22 Mar 2019 08:01 |
| URI: | https://pred.uni-regensburg.de/id/eprint/2684 |
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