Activated carbon and its hybrid composites with manganese (IV) oxide as effectual electrode materials for high performance supercapacitor

Arabian Journal of Chemistry

卷:15

Dibyashree Shrestha¹ 

[1] Department of Chemistry, Patan Multiple Campus, Tribhuvan University, Patan Dhoka, Lalitpur 44613, Nepal;

关键词: Activated carbon;    Aqueous electrolyte;    Manganese IV oxide;    Hybrid composite;    Supercapacitor;   

DOI  :  

来源: DOAJ

【 摘 要 】

Waste wood-dust of Dalbergia sisoo (Sisau) is presented, as a novel, low-cost, renewable, and sustainable source of agro-waste for the production of a highly porous activated carbon electrodes (Ds-electrodes) for supercapacitor. Ds-electrode was initially tested as supercapacitor electrode, which showed a lesser specific capacitance of 104.4 Fg−1. Therefore, hybrid-composite-electrodes (HCEs) were fabricated by adopting the nanostructured “manganese IV oxide (MnO2)-activated carbon (Ds) composite” in various ratios as the core electrode materials. The HCEs was prepared via a simple facile mechanical mixing method and polyvinylidine fluoride (PVDF) polymeric solution was used as the electrode material binder. The experimental results showed that the 1:1 Ds: MnO2 composite displayed highest specific capacitance of 300.2 Fg−1, capacity retention of 96.3 % after 1000 cycles, 16.3 WhKg−1 of specific energy density at power density of 148.2 WKg−1 and low equivalent series resistance (ESR) value of 0.41 Ω at equivalent (1:1, Ds:MnO2) loading of MnO2 to Ds. It is clear that the equivalent (1:1) concentration of MnO2 has improved the capacitive performance of the composite via pseudocapacitance charge storage mechanism as well as the enhancement on the specific surface area of the electrode. However, further increasing of the MnO2 content (1:2, Ds:MnO2) in the electrode was found to distort the capacitive performances and deteriorate the specific surface area of the electrode, mainly due to the aggregation of the MnO2 particles within the composite.

【 授权许可】

Unknown