Nanoporous CuCo 2 O 4 nanosheets as a highly efficient bifunctional electrode for supercapacitors and water oxidation catalysis

Sambhaji M. Pawar, Bharati S. Pawar, Pravin T. Babar, Abu Talha Aqueel Ahmed, Harish S. Chavan, Yongcheol Jo, Sangeun Cho, Jongmin Kim, Bo Hou, Akbar I. Inamdar, Seung Nam Cha, Jin Hyeok Kim, Tae Geun Kim, Hyungsang Kim, Hyunsik Im

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21 Citations (Scopus)

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 languageEnglish
Pages (from-to)360-367
Number of pages8
JournalApplied Surface Science
Volume470
DOIs
Publication statusPublished - 2019 Mar 15

Keywords

  • CuCo O nanosheets
  • Electrocatalyst
  • Electrodeposition
  • Oxygen evolution reaction
  • Supercapacitor

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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    Pawar, S. M., Pawar, B. S., Babar, P. T., Ahmed, A. T. A., Chavan, H. S., Jo, Y., Cho, S., Kim, J., Hou, B., Inamdar, A. I., Cha, S. N., Kim, J. H., Kim, T. G., Kim, H., & Im, H. (2019). Nanoporous CuCo 2 O 4 nanosheets as a highly efficient bifunctional electrode for supercapacitors and water oxidation catalysis Applied Surface Science, 470, 360-367. https://doi.org/10.1016/j.apsusc.2018.11.151