Enhanced electrochemical performance of MnNi2O4/rGO nanocomposite as pseudocapacitor electrode material and methanol electro-oxidation catalyst

Mohammad Bagher Askari; Parisa Salarizadeh; Antonio Di Bartolomeo; Fatih Şen

doi:10.1088/1361-6528/abfded

Enhanced electrochemical performance of MnNi₂O₄/rGO nanocomposite as pseudocapacitor electrode material and methanol electro-oxidation catalyst

Nanotechnology. 2021 May 21;32(32). doi: 10.1088/1361-6528/abfded.

Authors

Mohammad Bagher Askari¹, Parisa Salarizadeh², Antonio Di Bartolomeo³, Fatih Şen⁴

Affiliations

¹ Department of Physics, Faculty of Science, University of Guilan, PO Box 41335-1914, Rasht, Iran.
² High-Temperature Fuel Cell Research Department, Vali-e-Asr University of Rafsanjan, Rafsanjan 1599637111, Iran.
³ Department of Physics 'E. R. Caianiello' and 'Interdepartmental center NANOMATES', University of Salerno, I-84084, Fisciano, Salerno, Italy.
⁴ Sen Research Group, Department of Biochemistry, University of Dumlupınar, 43000 Kütahya, Turkey.

PMID: 33946059
DOI: 10.1088/1361-6528/abfded

Abstract

Binary transition metal oxides with encouraging electrocatalyst properties have been suggested as electrode materials for supercapacitors and methanol oxidation. Hence, in this work, a binary mixed metal oxide based on nickel and manganese (MnNi₂O₄) and its hybrid with reduced graphene oxide were synthesized by a one-step hydrothermal method. After physical and morphological characterization, the potential of these nanostructures was investigated for use as supercapacitor electrodes and methanol electro-oxidation. The results of the electrochemical analysis showed a substantial effect of adding rGO to the MnNi₂O₄. The MnNi₂O₄/rGO hybrid electrode supercapacitor exhibited good stability of 93% after 2000 consecutive CV cycles and a specific capacitance of 575 F g^-1at the current density of 0.5 A g^-1. Furthermore, the application of this hybrid nanomaterial in the methanol electro-oxidation reaction (MOR) indicated its appropriate electrochemical efficiency and stability in methanol oxidation. Our results show that MnNi₂O₄/rGO can be considered as a promising electrode material for energy applications.

Keywords: MnNi2O4/rGO; binary transition metal oxides; methanol electro-oxidation; pseudocapacitor.