Nanoporous CuCo2O4 nanosheets as a highly efficient bifunctional electrode for supercapacitors and water oxidation catalysis

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 and Im, Hyunsik 2019. Nanoporous CuCo2O4 nanosheets as a highly efficient bifunctional electrode for supercapacitors and water oxidation catalysis. Applied Surface Science 470 , p. 360. 10.1016/j.apsusc.2018.11.151

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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 ∼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 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.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	Elsevier
ISSN:	0169-4332
Date of First Compliant Deposit:	20 February 2020
Date of Acceptance:	19 November 2018
Last Modified:	20 Feb 2020 09:06
URI:	http://orca.cf.ac.uk/id/eprint/129535

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