View in EDS

Synergistic integration of graphene and ZnMn3O7 via green hydrothermal route for high-capacitance electrodes.

Saved in:
Bibliographic Details
Title: Synergistic integration of graphene and ZnMn3O7 via green hydrothermal route for high-capacitance electrodes.
Authors: Nawaz, Pakeeza Aymen1 (AUTHOR), Boota, Muhammad1 (AUTHOR), Almohammedi, Abdullah2 (AUTHOR), Amami, Mongi3 (AUTHOR), Mujtaba, Ali4 (AUTHOR), Khan, M. Naziruddin2 (AUTHOR), Ahmad, Awais5 (AUTHOR), Iqbal, Munawar6 (AUTHOR), Khan, M.I.1 (AUTHOR) muhammad.iftikhar@phys.uol.edu.pk
Source: Diamond & Related Materials. Jun2026, Vol. 166, pN.PAG-N.PAG. 1p.
Subjects: Hydrothermal synthesis, Nanocomposite materials, Capacitance measurement, Manganese oxides, Graphene, Supercapacitors, Electrodes, Charge transfer
Abstract: The development of sustainable, high-performance electrode materials is critical for next-generation supercapacitors. Herein, we report a green and eco-friendly hydrothermal synthesis of ZnMn₃O₇ and Graphene@ZnMn₃O₇ nanocomposites using neem (Azadirachta indica) leaf extract as a natural reductant and stabilizer. X-ray Diffraction (XRD) analysis confirms successful phase integration with an optimized crystallite size of ~20.9 nm and reduced dislocation line density (2.29 × 1015 m−2) for the composite. Fourier Transform Infrared Spectroscopy (FTIR) reveals strong Mn–O–Zn bonding and effective graphene coupling through C C vibrations. Scanning Electron Microscopy (SEM) images show a porous, flake-like interconnected morphology that suppresses agglomeration and improves electrolyte accessibility. Cyclic Voltammetry (CV) measurements show enlarged enclosed areas with mixed capacitive–diffusion-controlled charge storage behavior. Galvanostatic Charge–Discharge (GCD) results reveal that the Graphene@ZnMn 3 O 7 composite delivers a high specific capacitance of 306 F g−1 at 0.8 A g−1 with excellent rate capability, significantly outperforming the pristine electrodes. Electrochemical Impedance Spectroscopy (EIS) analysis yields a low charge-transfer resistance of 1.19 Ω and a high ion diffusion coefficient of 7.96 × 10−9 cm2 s−1, confirming rapid charge transport. Overall, the synergistic graphene–ZnMn₃O₇ architecture offers strong potential for scalable, high-energy, and sustainable supercapacitor applications. Phytochemical-assisted hydrothermal synthesis of Graphene@ZnMn₃O₇ nanocomposites enabling fast charge transfer, improved ion diffusion, and high capacitive performance. [Display omitted] • Green hydrothermal synthesis of ZnMn₃O₇ using neem extract • Graphene@ZnMn₃O₇ nanocomposite with optimized crystallite size • Strong Mn–O–Zn bonding and effective graphene coupling • High specific capacitance (306 F g−1) at 0.8 A/g • Low charge-transfer resistance (1.19 Ω) and fast ion diffusion [ABSTRACT FROM AUTHOR]
Copyright of Diamond & Related Materials is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
FullText Text:
  Availability: 0
Header DbId: egs
DbLabel: Engineering Source
An: 194396126
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Synergistic integration of graphene and ZnMn3O7 via green hydrothermal route for high-capacitance electrodes.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Nawaz%2C+Pakeeza+Aymen%22">Nawaz, Pakeeza Aymen</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Boota%2C+Muhammad%22">Boota, Muhammad</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Almohammedi%2C+Abdullah%22">Almohammedi, Abdullah</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Amami%2C+Mongi%22">Amami, Mongi</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Mujtaba%2C+Ali%22">Mujtaba, Ali</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Khan%2C+M%2E+Naziruddin%22">Khan, M. Naziruddin</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ahmad%2C+Awais%22">Ahmad, Awais</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Iqbal%2C+Munawar%22">Iqbal, Munawar</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Khan%2C+M%2EI%2E%22">Khan, M.I.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> muhammad.iftikhar@phys.uol.edu.pk</i>
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Diamond+%26+Related+Materials%22">Diamond & Related Materials</searchLink>. Jun2026, Vol. 166, pN.PAG-N.PAG. 1p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Hydrothermal+synthesis%22">Hydrothermal synthesis</searchLink><br /><searchLink fieldCode="DE" term="%22Nanocomposite+materials%22">Nanocomposite materials</searchLink><br /><searchLink fieldCode="DE" term="%22Capacitance+measurement%22">Capacitance measurement</searchLink><br /><searchLink fieldCode="DE" term="%22Manganese+oxides%22">Manganese oxides</searchLink><br /><searchLink fieldCode="DE" term="%22Graphene%22">Graphene</searchLink><br /><searchLink fieldCode="DE" term="%22Supercapacitors%22">Supercapacitors</searchLink><br /><searchLink fieldCode="DE" term="%22Electrodes%22">Electrodes</searchLink><br /><searchLink fieldCode="DE" term="%22Charge+transfer%22">Charge transfer</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The development of sustainable, high-performance electrode materials is critical for next-generation supercapacitors. Herein, we report a green and eco-friendly hydrothermal synthesis of ZnMn₃O₇ and Graphene@ZnMn₃O₇ nanocomposites using neem (Azadirachta indica) leaf extract as a natural reductant and stabilizer. X-ray Diffraction (XRD) analysis confirms successful phase integration with an optimized crystallite size of ~20.9 nm and reduced dislocation line density (2.29 × 1015 m−2) for the composite. Fourier Transform Infrared Spectroscopy (FTIR) reveals strong Mn–O–Zn bonding and effective graphene coupling through C C vibrations. Scanning Electron Microscopy (SEM) images show a porous, flake-like interconnected morphology that suppresses agglomeration and improves electrolyte accessibility. Cyclic Voltammetry (CV) measurements show enlarged enclosed areas with mixed capacitive–diffusion-controlled charge storage behavior. Galvanostatic Charge–Discharge (GCD) results reveal that the Graphene@ZnMn 3 O 7 composite delivers a high specific capacitance of 306 F g−1 at 0.8 A g−1 with excellent rate capability, significantly outperforming the pristine electrodes. Electrochemical Impedance Spectroscopy (EIS) analysis yields a low charge-transfer resistance of 1.19 Ω and a high ion diffusion coefficient of 7.96 × 10−9 cm2 s−1, confirming rapid charge transport. Overall, the synergistic graphene–ZnMn₃O₇ architecture offers strong potential for scalable, high-energy, and sustainable supercapacitor applications. Phytochemical-assisted hydrothermal synthesis of Graphene@ZnMn₃O₇ nanocomposites enabling fast charge transfer, improved ion diffusion, and high capacitive performance. [Display omitted] • Green hydrothermal synthesis of ZnMn₃O₇ using neem extract • Graphene@ZnMn₃O₇ nanocomposite with optimized crystallite size • Strong Mn–O–Zn bonding and effective graphene coupling • High specific capacitance (306 F g−1) at 0.8 A/g • Low charge-transfer resistance (1.19 Ω) and fast ion diffusion [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Diamond & Related Materials is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=194396126
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.diamond.2026.113739
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Hydrothermal synthesis
        Type: general
      – SubjectFull: Nanocomposite materials
        Type: general
      – SubjectFull: Capacitance measurement
        Type: general
      – SubjectFull: Manganese oxides
        Type: general
      – SubjectFull: Graphene
        Type: general
      – SubjectFull: Supercapacitors
        Type: general
      – SubjectFull: Electrodes
        Type: general
      – SubjectFull: Charge transfer
        Type: general
    Titles:
      – TitleFull: Synergistic integration of graphene and ZnMn3O7 via green hydrothermal route for high-capacitance electrodes.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Nawaz, Pakeeza Aymen
      – PersonEntity:
          Name:
            NameFull: Boota, Muhammad
      – PersonEntity:
          Name:
            NameFull: Almohammedi, Abdullah
      – PersonEntity:
          Name:
            NameFull: Amami, Mongi
      – PersonEntity:
          Name:
            NameFull: Mujtaba, Ali
      – PersonEntity:
          Name:
            NameFull: Khan, M. Naziruddin
      – PersonEntity:
          Name:
            NameFull: Ahmad, Awais
      – PersonEntity:
          Name:
            NameFull: Iqbal, Munawar
      – PersonEntity:
          Name:
            NameFull: Khan, M.I.
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 01
              M: 06
              Text: Jun2026
              Type: published
              Y: 2026
          Identifiers:
            – Type: issn-print
              Value: 09259635
          Numbering:
            – Type: volume
              Value: 166
          Titles:
            – TitleFull: Diamond & Related Materials
              Type: main
ResultId 1