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Journal article
Micelle‐Assisted Electrodeposition of γ‐MnO2 on Lead Anodes: Structural and Electrochemical Insights
ChemNanoMat : chemistry of nanomaterials for energy, biology and more, Early View
2025
Abstract
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 WasteRob Aughterson - Australian Nuclear Science and Technology OrganisationParul Sharma - J.C. Bose University of Science & Technology, YMCAAnurag Prakash Sunda - J.C. Bose University of Science & Technology, YMCAKatsuhiko Ariga - National Institute for Materials ScienceLok Kumar Shrestha - National Institute for Materials Science
- Publication Details
- ChemNanoMat : chemistry of nanomaterials for energy, biology and more, Early View
- Publisher
- ChemNanoMat published by Wiley-VCH GmbH; WEINHEIM
- Number of pages
- 11
- Identifiers
- 991005796261507891
- Copyright
- © 2025 The Author(s).
- 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