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Molybdenum trioxide for supercapacitor application: defining the role of temperature and electrolyte

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Abstract

The need to optimize basic synthesis parameters to get energy storage electrode with controlled structure and morphology cannot be overemphasized in getting improved specific capacitance among other supercapacitor properties. Here in, α-MoO3 electrodes were synthesized at low spray temperature of 200 ℃ and below as compared to high spray temperature in the literature. The prepared films were tested using XRD, SEM, EDS, UV–Vis, and electrochemically in three electrodes configurations in 1.0 M of KOH (unblended electrolyte) and 0.5 M LiOH/0.5 M KOH (blended electrolyte) electrolytes using galvanostatic charge/discharge (GCD), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The results showed α-MoO3 structure of the films with increase in the crystallite size (29.1–31.5 nm), nanosheet to pebble-like morphologies, and decrease in the bandgap (3.1–2.78 eV) from spray temperature of 150 ℃, to 200 ℃. The greatest specific capacitance displayed by the electrode was 1070 and 865 F/g in LiOH/KOH and KOH, respectively, with about 89.5% capacitive retention in LiOH/KOH. The results gotten show that the as-prepared α-MoO3 is a promising material for supercapacitor electrode.

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Data availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

This work was supported by the Deanship of Scientific Research, Vice Presidency for Graduate Studies and Scientific Research, King Faisal University, Saudi Arabia [GrantA297].

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The authors declare that no funds, grants, or other support was received during the preparation of this manuscript.

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Authors and Affiliations

  1. Department of Physics and Astronomy, University of Nigeria, Nsukka, 410001, Enugu, Nigeria

    Kingsley U. Nsude, Hope E. Nsude, Assumpta C. Nwanya, A. B. C. Ekwealor & Fabian I. Ezema

  2. Africa Centre of Excellence for Sustainable Power and Energy Development (ACE-SPED), University of Nigeria, Nsukka, Nigeria

    Assumpta C. Nwanya & Fabian I. Ezema

  3. Department of Physics, College of Science, King Faisal University, P.O. Box 400, 31982, Al Ahsa, Saudi Arabia

    Adil Alshoaibi

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Contributions

K.U.Nsude: Conceptualization, Methodology, Data curation, Validation, Experiments, Formal analysis, Investigation, and Writing original draft. H.E. Nsude, A.C. Nwanya: Validation, and Data curation. H.E. Nsude, A.C. Nwanya: Experiments and Data curation. Adil Alshoaibi: Conceptualization and Supervision. ABC Ekwealor & H.E. Nsude: Validation and Formal analysis. ABC Ekwealor & Fabian I. Ezema: Validation and Formal analysis. Fabian I. Ezema: Conceptualization, Supervision, Validation, and Formal analysis.

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Correspondence to Fabian I. Ezema.

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Nsude, K.U., Nsude, H.E., Nwanya, A.C. et al. Molybdenum trioxide for supercapacitor application: defining the role of temperature and electrolyte. J Mater Sci: Mater Electron 35, 1399 (2024). https://doi.org/10.1007/s10854-024-13029-x

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