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Abstract
A new pseudocapacitive combination, viz. CoOMnO2−MnCo2O4 hybrid nanowires (HNWs), is synthesized using a facile single-step hydrothermal process, and its properties are benchmarked with conventional battery-type flower-shaped MnCo2O4 obtained by similar processing. The HNWs showed high electrical conductivity and specific capacitance ( Cs) (1650 Fg −1 or 184 mA h g −1 at 1 A g−1) with high capacity retention, whereas MnCo2O4 nanoflower electrode showed only one-third conductivity and one-half of its capacitance (872 F g−1 or 96 mA hg −1 at 1 A g−1) when used as a supercapacitor electrode in 6 MKOH electrolyte. The structure −property relationship of the materials is deeply investigated and reported herein. Using the HNWs as a pseudocapacitive electrode and commercial activated carbon as a supercapacitive electrode we achieved battery-like specific energy ( Es) and supercapacitor-like specific power ( Ps) in aqueous alkaline asymmetric supercapacitors (ASCs). The HNWs ASCs have shown high Es (90 Wh kg−1) (volumetric energy density Ev ≈ 0.52 Wh cm −3) with Ps up to ∼104 W kg −1 (volumetric power density Pv ≈ 5 W cm −3) in 6 M KOH electrolyte, allowing the device to store an order of magnitude more energy than conventional supercapacitors.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Pseudocapacitiv; CoO-MnO2−MnCo2O4; nanowires |
| Subjects: | Q Science > Q Science (General) Q Science > QC Physics Q Science > QD Chemistry T Technology > TK Electrical engineering. Electronics Nuclear engineering |
| Faculty/Division: | Faculty of Industrial Sciences And Technology |
| Depositing User: | Prof. Dr. Jose Rajan |
| Date Deposited: | 06 Dec 2017 02:37 |
| Last Modified: | 10 Oct 2018 04:57 |
| URI: | http://umpir.ump.edu.my/id/eprint/19284 |
| Download Statistic: | View Download Statistics |
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