Abstract
In this work, β-Co(OH)2 nanosheets are explored as efficient pseudocapacitive materials for the fabrication of 1.6 V class high-energy supercapacitors in asymmetric fashion. The as-synthesized β-Co(OH)2 nanosheets displayed an excellent electrochemical performance owing to their unique structure, morphology, and reversible reaction kinetics (fast faradic reaction) in both the three-electrode and asymmetric configuration (with activated carbon, AC). For example, in the three-electrode set-up, β-Co(OH)2 exhibits a high specific capacitance of ∼675 F g−1 at a scan rate of 1 mV s−1. In the asymmetric supercapacitor, the β-Co(OH)2∥AC cell delivers a maximum energy density of 37.3 Wh kg−1 at a power density of 800 W kg−1. Even at harsh conditions (8 kW kg−1), an energy density of 15.64 Wh kg−1 is registered for the β-Co(OH)2∥AC assembly. Such an impressive performance of β-Co(OH)2 nanosheets in the asymmetric configuration reveals the emergence of pseudocapacitive electrodes towards the fabrication of high-energy electrochemical charge storage systems.
| Original language | English |
|---|---|
| Pages (from-to) | 2127-2133 |
| Number of pages | 7 |
| Journal | Chemistry - An Asian Journal |
| Volume | 12 |
| Issue number | 16 |
| DOIs | |
| Publication status | Published - Aug 17 2017 |
| Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
ASJC Scopus Subject Areas
- Biochemistry
- Organic Chemistry
Keywords
- activated carbon
- asymmetric supercapacitors
- charge-discharge
- energy density
- β-Co(OH) nanosheets