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Issue 6, 2020
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Deep eutectic solvent-assisted synthesis of RuCo2O4: an efficient positive electrode for hybrid supercapacitors

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Abstract

Bimetallic oxides attract significant interest for application in supercapacitors because of their multivalent active sites, which render them highly efficient materials. Herein, we develop a new approach for the synthesis of a bimetallic oxide using a choline chloride and urea (1 : 2)-based deep eutectic solvent. We synthesize a unique amorphous nanofibrous network of RuCo2O4 with an effective surface area of 245 m2 g−1. By virtue of nanofibrous networks, amorphous behavior and high surface area, RuCo2O4 exhibits a superior specific capacity of 372 mA h g−1 at 3.3 A g−1 with an excellent rate capability (55% after 41 A g−1) and cycling stability (94% after 10 000 cycles). Additionally, an aqueous hybrid supercapacitor cell is fabricated using RuCo2O4 and reduced graphene oxide as a positive and negative electrode, respectively. The proposed RuCo2O4//rGO hybrid supercapacitor cell demonstrates an extended potential window of 1.4 V with an excellent energy density of 59.7 W h kg−1.

Graphical abstract: Deep eutectic solvent-assisted synthesis of RuCo2O4: an efficient positive electrode for hybrid supercapacitors

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Article information


Submitted
03 Mar 2020
Accepted
14 Apr 2020
First published
14 Apr 2020

Sustainable Energy Fuels, 2020,4, 3066-3076
Article type
Paper

Deep eutectic solvent-assisted synthesis of RuCo2O4: an efficient positive electrode for hybrid supercapacitors

S. S. Karade, S. Lalwani, J. Eum and H. Kim, Sustainable Energy Fuels, 2020, 4, 3066
DOI: 10.1039/D0SE00340A

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