Journal
RSC ADVANCES
Volume 6, Issue 43, Pages 36954-36960Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra02858f
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Funding
- Environmental Technology Program [R-265-000-450-490]
- Defence Research and Technology of MINDEF [R-394-001-077-232]
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In this article, we report the development of manganese oxide (Mn3O4) on carbon nanotube (CNT) hydrogels as binder-free electrodes for asymmetric supercapacitors. The CNT hydrogels consisting of three dimensionally inter-connected nanotubes are prepared via a facile sol-gel method. Afterwards, flower-like Mn3O4 is incorporated into CNT hydrogels using a pulse electrochemical deposition. Satisfactory electrochemical performance with a high specific capacitance of 182 F g(-1) (473 mF cm(-2)) is achieved. When employing activated carbon as negative electrodes, the assembled asymmetric supercapacitor exhibits a high potential window of 2 V to reach a specific energy of 26.6 W h kg(-1) and a specific power of 5.2 kW kg(-1). These results are much better compared with the results from pure Mn3O4. The remarkable performance of our composites can be ascribed to a highly conducting CNT micro-scaffold and pseudocapacitive Mn3O4.
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