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

Swapnil S. Karade, Shubra Lalwani, Jeong Hyun Eum, Hansung Kim

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


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 RuCo2O4with an effective surface area of 245 m2g−1. By virtue of nanofibrous networks, amorphous behavior and high surface area, RuCo2O4exhibits a superior specific capacity of 372 mA h g−1at 3.3 A g−1with 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 RuCo2O4and 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

Original languageEnglish
Pages (from-to)3066-3076
Number of pages11
JournalSustainable Energy and Fuels
Issue number6
Publication statusPublished - 2020 Jun

Bibliographical note

Funding Information:
This work was supported by a National Research Foundation (NRF) grant funded by the Ministry of Science, ICT, and Future Planning [grant number NRF-2018M3A7B4071535], the Priority Research Centers Program through the National Research Foundation of Korea [grant number NRF-2019R1A6A1A11055660], and the Yonsei University Research Fund (Postdoctoral Researcher Support Program) of 2019 [grant number 2019-12-0006].

Publisher Copyright:
© The Royal Society of Chemistry 2020.

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology


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