Abstract
Efficient and low‐cost multifunctional electrodes play a key role in improving the performance of energy conversion and storage devices. In this study, ultrathin nanoporous CuCo 2 O 4 nanosheets are synthesized on a nickel foam substrate using electrodeposition followed by air annealing. The CuCo 2 O 4 nanosheet electrode exhibits a high specific capacitance of 1473 F g ─1 at 1 A g ─1 with a capacity retention of ∼93% after 5000 cycles in 3 M KOH solution. It also works well as an efficient oxygen evolution reaction electrocatalyst, demonstrating an overpotential of 260 mV at 20 mA cm ─2 with a Tafel slope of ∼64 mV dec ─1 . in 1 M KOH solution, which is the lowest reported among other copper-cobalt based transition metal oxide catalysts. The catalyst is very stable at >20 mA cm ─2 for more than 25 h. The superior electrochemical performance of the CuCo 2 O 4 nanosheet electrode is due to the synergetic effect of the direct growth of 2D nanosheet structure and a large electrochemically active surface area associated with nanopores on the CuCo 2 O 4 nanosheet surface.
Original language | English |
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Pages (from-to) | 360-367 |
Number of pages | 8 |
Journal | Applied Surface Science |
Volume | 470 |
DOIs | |
Publication status | Published - 2019 Mar 15 |
Bibliographical note
Publisher Copyright:© 2018 Elsevier B.V.
Keywords
- CuCo O nanosheets
- Electrocatalyst
- Electrodeposition
- Oxygen evolution reaction
- Supercapacitor
ASJC Scopus subject areas
- General Chemistry
- Condensed Matter Physics
- General Physics and Astronomy
- Surfaces and Interfaces
- Surfaces, Coatings and Films