Nanoporous CuCo2O4 nanosheets as a highly efficient bifunctional electrode for supercapacitors and water oxidation catalysis
- Authors
- Pawar, Sambhaji M.; Pawar, Bharati S.; Babar, Pravin T.; Ahmed, Abu Talha Aqueel; Chavan, Harish S.; Jo, Yongcheol; Cho, Sangeun; Kim, Jongmin; Hou, Bo; Inamdar, Akbar I.; Cha, Seungnam; Kim, Jin Hyeok; Kim, Tae Geun; Kim, Hyungsang; Im, Hyunsik
- Issue Date
- 15-3월-2019
- Publisher
- ELSEVIER
- Keywords
- CuCo2O4 nanosheets; Electrodeposition; Supercapacitor; Electrocatalyst; Oxygen evolution reaction
- Citation
- APPLIED SURFACE SCIENCE, v.470, pp.360 - 367
- Indexed
- SCIE
SCOPUS
- Journal Title
- APPLIED SURFACE SCIENCE
- Volume
- 470
- Start Page
- 360
- End Page
- 367
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/66658
- DOI
- 10.1016/j.apsusc.2018.11.151
- ISSN
- 0169-4332
- 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 CuCo2O4 nanosheets are synthesized on a nickel foam substrate using electrodeposition followed by air annealing. The CuCo2O4 nanosheet electrode exhibits a high specific capacitance of 1473 F g(-1) at 1 A g(-1) with a capacity retention of similar to 93% after 5000 cycles in 3M KOH solution. It also works well as an efficient oxygen evolution reaction electrocatalyst, demonstrating an overpotential of 260 mV m 20 mA cm(-2) with a Tafel slope of similar to 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 > 20 mA cm(-2) for more than 25 h. The superior electrochemical performance of the CuCo2O4 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 CuCo2O4 nanosheet surface.
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