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Ni/Co bimetallic flower-like metal–organic frameworks with enhanced performance for high-power energy storage applications

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Abstract

Metal–organic frameworks (MOFs) are promising materials for supercapacitors due to their surface area and tunable pore size. Pristine monometallic MOFs suffer from low conductivity. In this work, bimetallic Ni-rich/Co-MOFs were synthesized via a one-step solvothermal method. Various Ni2+ and Co2+ stoichiometric ratios were considered and their impact on MOF structure and electrochemical performance was evaluated. It was found that Co2+ substitution in the initial Ni-MOF structure enhanced the electrochemical properties, providing a specific capacitance of 1303 F g−1 (145 mAh g−1) at 1 A g−1, almost double than the monometallic Ni-MOF. An optimum stoichiometric ratio of (2)Ni:(1)Co was obtained.

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Data availability

The data that support the findings of this study are available from the corresponding authors, I.N and E.G, upon reasonable request.

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Acknowledgments

The authors thank Chris Waldron for XPS data collection and interpretation, facilitated by the Seedcorn Access scheme which is part of the EPSRC-funded Warwick Analytical Science Centre (EP/V007688/1). Chiara Milanese acknowledges support from the Ministero dell’Università e della Ricerca (MUR) and the University of Pavia through the program “Dipartimenti di Eccellenza 2023–2027.”

Funding

This work is partially financially supported by the Lloyds Registered Foundation (ICON Schemes), Reference 515432241.

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Authors and Affiliations

  1. Centre for E-Mobility and Clean Growth, (CEMR), Coventry University, 8 Mile Ln, Coventry, CV1 2TU, UK

    Ilias Ntoukas, Rong Lan, Alexander J. Roberts & Evangelos I. Gkanas

  2. Pavia Hydrogen Lab, Chemistry Department, University of Pavia & C.S.G.I., Viale Taramelli, 16, 27100, Pavia, Italy

    Chiara Milanese

  3. Department of Physics, University of Warwick, Coventry, CV4 7AL, UK

    Marc Walker

  4. Discipline of Chemistry, The University of Newcastle, Callaghan, NSW, 2308, Australia

    Scott W. Donne

Authors
  1. Ilias Ntoukas
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  2. Rong Lan
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  3. Chiara Milanese
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  4. Marc Walker
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  5. Scott W. Donne
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  6. Alexander J. Roberts
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  7. Evangelos I. Gkanas
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Contributions

IN carried out the MOFs syntheses, SEM, EDX, XRD, FTIR, BET, and electrochemical characterizations. IN performed data analysis and drafted the manuscript. RL participated in the electrochemical characterization and electrode preparation. CM carried out the TGA characterization. MW carried out the XPS characterization and analysis. SD participated in the electrochemical characterization and analysis. AR participated in the coordination of the electrochemical characterization, electrochemical analysis, and helped draft the manuscript. EG conceived the study, participated in its design and coordination, participated in MOF synthesis and electrochemical characterization, electrode preparation, data analysis, and helped to draft the manuscript.

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Correspondence to Ilias Ntoukas or Evangelos I. Gkanas.

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Ntoukas, I., Lan, R., Milanese, C. et al. Ni/Co bimetallic flower-like metal–organic frameworks with enhanced performance for high-power energy storage applications. MRS Communications 14, 69–75 (2024). https://doi.org/10.1557/s43579-023-00501-8

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