Micelle‐Assisted Electrodeposition of γ‐MnO2 on Lead Anodes: Structural and Electrochemical Insights

Manickam Minakshi; Rob Aughterson; Parul Sharma; Anurag Prakash Sunda; Katsuhiko Ariga; Lok Kumar Shrestha

doi:10.1002/cnma.202500270

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Micelle‐Assisted Electrodeposition of γ‐MnO2 on Lead Anodes: Structural and Electrochemical Insights

Journal article

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Peer reviewed

Micelle‐Assisted Electrodeposition of γ‐MnO2 on Lead Anodes: Structural and Electrochemical Insights

Manickam Minakshi, Rob Aughterson, Parul Sharma, Anurag Prakash Sunda, Katsuhiko Ariga and Lok Kumar Shrestha

ChemNanoMat : chemistry of nanomaterials for energy, biology and more, Vol.11(10), e202500270

2025

DOI: https://doi.org/10.1002/cnma.202500270

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Abstract

depositions

electrolysis

energy

manganese dioxides

storage

surfactant

Electrolysis of MnSO4 in H2SO4 with cationic surfactants (tetradecyltrimethylammonium bromide; TTAB and cetyltrimethylammonium bromide; CTAB) led to the formation of γ-MnO2 with surfactant intercalation in an amorphous matrix. Unlike conventional self-standing EMD electrodes, which limit scalability, this study presents bulk electrodeposition of EMD powder on a lead (Pb) anode. Surface morphology is significantly altered by surfactant presence, though X-ray diffraction and density functional theory analyzes confirms consistent γ-MnO2 crystallography across samples. Galvanostatic charge–discharge at 0.6 A g−1 reveals that TTAB-assisted EMD achieved a specific capacitance of 478.6 F g−1, double that of pristine EMD (232 F g−1), due to improved ion transport and surface area. In contrast, CTAB-assisted EMD shows reduced capacitance (124.6 F g−1), attributed to early micelle formation and immobilization within the MnO2 lattice, which promoted SO42− insertion over surfactant deintercalation. Surfactant critical micelle concentrations and surface activity are key to electrochemical behavior in 1 M Na2SO4. An asymmetric device using TTAB-EMD as the cathode and activated carbon as the anode delivered 106 F g−1 and 40 Wh kg−1, demonstrating practical viability. Band structure calculations support the experimental findings, indicating favorable electronic properties for charge storage.

Details

Title: Micelle‐Assisted Electrodeposition of γ‐MnO2 on Lead Anodes: Structural and Electrochemical Insights
Authors/Creators: Manickam Minakshi - Murdoch University, Centre for Water, Energy and Waste
Rob Aughterson - Australian Nuclear Science and Technology Organisation
Parul Sharma - J.C. Bose University of Science & Technology, YMCA
Anurag Prakash Sunda - J.C. Bose University of Science & Technology, YMCA
Katsuhiko Ariga - National Institute for Materials Science
Lok Kumar Shrestha - National Institute for Materials Science
Publication Details: ChemNanoMat : chemistry of nanomaterials for energy, biology and more, Vol.11(10), e202500270
Publisher: ChemNanoMat published by Wiley-VCH GmbH; WEINHEIM
Number of pages: 11
Identifiers: 991005796261507891
Murdoch Affiliation: Centre for Water, Energy and Waste; College of Science, Technology, Engineering and Mathematics
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Citation topics: 2 Chemistry; 2.62 Electrochemistry; 2.62.52 Electrode Materials
Web Of Science research areas: Chemistry, Multidisciplinary; Materials Science, Multidisciplinary; Nanoscience & Nanotechnology
ESI research areas: Materials Science