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Catalysts 2019, 9(2), 176; https://doi.org/10.3390/catal9020176

Electrodeposited Nanostructured CoFe2O4 for Overall Water Splitting and Supercapacitor Applications

1
Department of Chemistry, Pittsburg State University, Pittsburg, KS 66762, USA
2
Department of Physics, Pittsburg State University, Pittsburg, KS 66762, USA
3
Department of Materials Science, Montanuniversitӓt Leoben, 8700 Leoben, Austria
4
Department of Mechanical Engineering Sciences, University of Surrey, Guildford, Surrey GU2 7XH, UK
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Department of Mechanical Engineering and Materials Science and Engineering, Cyprus University of Technology, 3036 Lemesos, Cyprus
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Department of Mechanical Engineering, Khalifa University of Science and Technology, P.O. Box 127788 Abu Dhabi, UAE
7
Center for Catalysis and Separation, Khalifa University of Science and Technology, P.O. Box 127788 Abu Dhabi, UAE
8
Department of Mechanical and Manufacturing Engineering, University of Cyprus, 1678 Nicosia, Cyprus
*
Authors to whom correspondence should be addressed.
Received: 20 January 2019 / Revised: 5 February 2019 / Accepted: 12 February 2019 / Published: 13 February 2019
(This article belongs to the Special Issue Catalysis for Energy Production)
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Abstract

To contribute to solving global energy problems, a multifunctional CoFe2O4 spinel was synthesized and used as a catalyst for overall water splitting and as an electrode material for supercapacitors. The ultra-fast one-step electrodeposition of CoFe2O4 over conducting substrates provides an economic pathway to high-performance energy devices. Electrodeposited CoFe2O4 on Ni-foam showed a low overpotential of 270 mV and a Tafel slope of 31 mV/dec. The results indicated a higher conductivity for electrodeposited compared with dip-coated CoFe2O4 with enhanced device performance. Moreover, bending and chronoamperometry studies suggest excellent durability of the catalytic electrode for long-term use. The energy storage behavior of CoFe2O4 showed high specific capacitance of 768 F/g at a current density of 0.5 A/g and maintained about 80% retention after 10,000 cycles. These results demonstrate the competitiveness and multifunctional applicability of the CoFe2O4 spinel to be used for energy generation and storage devices. View Full-Text
Keywords: CoFe2O4; OER; HER; supercapacitor; overall water splitting CoFe2O4; OER; HER; supercapacitor; overall water splitting
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Zhang, C.; Bhoyate, S.; Zhao, C.; Kahol, P.K.; Kostoglou, N.; Mitterer, C.; Hinder, S.J.; Baker, M.A.; Constantinides, G.; Polychronopoulou, K.; Rebholz, C.; Gupta, R.K. Electrodeposited Nanostructured CoFe2O4 for Overall Water Splitting and Supercapacitor Applications. Catalysts 2019, 9, 176.

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