Binary mixed metal oxide sphere-like structures for hybrid supercapacitor electrode with improved electrochemical properties

Periyasamy Sivakumar, Loganathan Kulandaivel, Jeong Won Park, C. Justin Raj, A. Dennyson Savariraj, Ramu Manikandan, Ramesh Rajendran, Hyun Jung

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The facile fabrication of stable and highly efficient metal oxide-based electrode materials by regulating the electroactive sites is crucial for supercapacitor applications. In this work, a two-step synthesis strategy comprising hydrothermal and heat treatment was employed to prepare the NiWO4/WO3 (NW/W-O) as electrode materials for supercapacitors. Moreover, the heat treatment temperature influences and alters the physicochemical and electrochemical properties of the obtained NW/W-O products. The material prepared at 500 °C (NW/W-O(A)) unveils low crystallinity, small particle size, and a large surface area with a narrow porous feature than the material obtained at 600 °C (NW/W-O(B)). Thus, the NW/W-O(A) electrode could be anticipated for effective charge transfer and better capacitive behavior. Notably, the NW/W-O(A) material exhibited a superior specific capacitance of 825 F g−1 than NW/W-O(B) with 536 F g−1 at a current density of 1 A g−1. Further, the NW/W-O(A) displayed a higher rate capability of 60% (@ 20 A g−1) than that of NW/W-O(B) (49%). The designed hybrid supercapacitor (NW/W-O(A)//AC) showed a high specific capacitance of 108 F g−1 and energy density of 33.77 Wh kg−1 at a power density of 896.39 W kg−1 with long-term cyclic retention of only <12% deterioration over 10,000 cycles. Hence, this work demonstrates that the influence of heat treatment temperature is a crucial parameter in tailoring electrode materials with promising energy storage capability.

Original languageEnglish
Article number103115
JournalSurfaces and Interfaces
StatePublished - Aug 2023
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2023 Elsevier B.V.


This research was supported by the National Research Foundation of Korea (NRF) , funded by the Korean government (MSIT) (No. NRF-2022R1F1A1063811 ) and (No. NRF-2022R1F1A1064008 ).

FundersFunder number
Ministry of Science, ICT and Future PlanningNRF-2022R1F1A1063811, NRF-2022R1F1A1064008
National Research Foundation of Korea


    • Energy storage
    • Heat treatment temperature
    • Hybrid supercapacitor
    • Nanostructures
    • NiWO/WO
    • Redox reactions


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