Harilal, Midhun and Krishnan, Syam G. and Yar, Asfand and Izan Izwan, Misnon and Reddy, M. Venkatashamy and M. M., Yusoff and Dennis, John Ojur and Rajan, Jose (2017) Pseudocapacitive Charge Storage in Single-Step-Synthesized CoO-MnO2-MnCo2O4 Hybrid Nanowires in Aqueous Alkaline Electrolytes. Journal of Physical Chemistry C, 121 (39). pp. 21171-21183. ISSN 1932-7447 (print); 1932-7455 (online). (Published)
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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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