An Investigation of the Electrochemical Properties of CuCo 2 O 4 @NiCo 2 O 4 Composite as Binder-Free Electrodes of a Supercapacitor

Bushra Nawaz, Muhammad Obaid Ullah and Ghulam Ali
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Bushra Nawaz: Department of Electronics Engineering, University of Engineering and Technology Taxila, Taxila 47080, Pakistan
Muhammad Obaid Ullah: Department of Electrical Engineering, University of Engineering and Technology Taxila, Taxila 47080, Pakistan
Ghulam Ali: U.S.-Pakistan Center for Advanced Studies in Energy (USPCAS-E), National University of Sciences and Technology (NUST), Sector H-12, Islamabad 44000, Pakistan

Energies, 2021, vol. 14, issue 11, 1-12

Abstract: Metallic oxides are considered promising candidates for supercapacitors owing to their inherent pseudocapacitive behavior and superior electrochemical properties. In this work, NiCo 2 O 4 , CuCo 2 O 4 , and CuCo 2 O 4 @NiCo 2 O 4 composite electrodes are synthesized directly on a nickel foam substrate via the facile hydrothermal method. The phase of the prepared materials was analyzed using the X-ray diffraction method. The morphology of the prepared binder-free electrodes was observed by scanning electron microscopy. The electrochemical testing was done in a 2 M KOH solution against an Ag/AgCl reference electrode. The CuCo 2 O 4 @NiCo 2 O 4 composite electrode demonstrated a value of specific capacitance as high as 422 F g −1 at a current density of 1 A g −1 and thus outperformed the NiCo 2 O 4 and CuCo 2 O 4 in terms of its electrochemical performance. The CuCo 2 O 4 @NiCo 2 O 4 composite retained a specific capacitance of 278 F g −1 even with the increase of current density to 10 A g −1 , which corresponds to a 34% loss of capacitance compared to 40% and 48% of individual NiCo 2 O 4 and CuCo 2 O 4 electrodes, respectively. Hence, the synergy in a composite material demonstrates it to be a potential candidate as an electrode in supercapacitors.

Keywords: metallic oxides; supercapacitors; composite electrodes; binder-free; CuCo 2 O 4 @NiCo 2 O 4 (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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