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Peer-reviewedCC BY-NCNext Energy

Synergistic MnO2/Co3O4 composites for enhanced asymmetric supercapacitor and electrocatalytic applications

  • Alamgir Khan1
  • Khizar Hayat1
  • Javid Ullah1
  • Zia Ur Rehman1
  • Muhammad Rauf2
  • Jasim Yousaf3
  • Said Karim Shah1,2
  1. 1Department of Physics, Abdul Wali Khan University Mardan (AWKUM), Mardan, Khyber Pakhtunkhwa 23200, Pakistan
  2. 2Phyiscs Division, School of Science and Technology, University of Camerino, Via Madonna delle Carceri 9, Camerino, MC 62032, Italy
  3. 3Shenzhen Key Laboratory of Advanced Thin Films and Applications, School of Physics and Optoelectronics Engineering, Shenzhen University, China
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Abstract

This study reports MnO 2 /Co 3 O 4 composites synthesized via hydrothermal route and employed for energy storage and water splitting applications. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis shows the crystalline nature with rods (MnO 2 ), nanosphere (Co 3 O 4 ) and nanoflowers (MnO 2 /Co 3 O 4 ) like morphologies. The specific capacitance ( C s ) of MnO 2 , Co 3 O 4, MC-(0.7:0.3), MC-(0.5:0.5) was calculated from cyclic voltammetry (CV), at 5 mV/s are 32.4, 40.44, 85.41, 121.32 F / g and from the galvanometric charge discharge (GCD), at 1 A/g, as 38.33, 46.6, 91.6, 133.4 F/g respectively. The enhanced C s of the composite electrode is attributed due to the high surface area and the electrical conductivity of Co 3 O 4 . EIS analysis shows MC-(0.5:0.5) electrode have lowest solution resistance ( R s ) of 1.15 Ω and charge transfer resistance ( R ct ) of 40 Ω. The LSV polarization curves shows the composites have low overpotential of 245 mV (MC-(0.5:0.5)) and 220 mV (MC-(0.7:0.3)) at the current density ( I d ) of 10 mA/cm 2 for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) activities respectively as compare to MnO 2 and Co 3 O 4 . These results demonstrated that the composite electrodes exhibited high electrochemical and electrocatalytic performances as compare to MnO 2 and Co 3 O 4 for both supercapacitor and electrocatalytic water splitting applications.

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Cite

BibTeXRIS
BibTeX
@article{khan2026synergistic,
  title = {{Synergistic MnO2/Co3O4 composites for enhanced asymmetric supercapacitor and electrocatalytic applications}},
  author = {Alamgir Khan and Khizar Hayat and Javid Ullah and Zia Ur Rehman and Muhammad Rauf and Jasim Yousaf and Said Karim Shah},
  journal = {Next Energy},
  year = {2026},
  month = jun,
  doi = {10.1016/j.nxener.2026.100702},
  url = {https://doi.org/10.1016/j.nxener.2026.100702},
  note = {CC BY-NC},
}
RIS
TY  - JOUR
TI  - Synergistic MnO2/Co3O4 composites for enhanced asymmetric supercapacitor and electrocatalytic applications
AU  - Alamgir Khan
AU  - Khizar Hayat
AU  - Javid Ullah
AU  - Zia Ur Rehman
AU  - Muhammad Rauf
AU  - Jasim Yousaf
AU  - Said Karim Shah
PY  - 2026
DA  - 2026/06/06
JO  - Next Energy
DO  - 10.1016/j.nxener.2026.100702
UR  - https://doi.org/10.1016/j.nxener.2026.100702
AB  - This study reports MnO 2 /Co 3 O 4 composites synthesized via hydrothermal route and employed for energy storage and water splitting applications. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis shows the crystalline nature with rods (MnO 2 ), nanosphere (Co 3 O 4 ) and nanoflowers (MnO 2 /Co 3 O 4 ) like morphologies. The specific capacitance ( C s ) of MnO 2 , Co 3 O 4, MC-(0.7:0.3), MC-(0.5:0.5) was calculated from cyclic voltammetry (CV), at 5 mV/s are 32.4, 40.44, 85.41, 121.32 F / g and from the galvanometric charge discharge (GCD), at 1 A/g, as 38.33, 46.6, 91.6, 133.4 F/g respectively. The enhanced C s of the composite electrode is attributed due to the high surface area and the electrical conductivity of Co 3 O 4 . EIS analysis shows MC-(0.5:0.5) electrode have lowest solution resistance ( R s ) of 1.15 Ω and charge transfer resistance ( R ct ) of 40 Ω. The LSV polarization curves shows the composites have low overpotential of 245 mV (MC-(0.5:0.5)) and 220 mV (MC-(0.7:0.3)) at the current density ( I d ) of 10 mA/cm 2 for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) activities respectively as compare to MnO 2 and Co 3 O 4 . These results demonstrated that the composite electrodes exhibited high electrochemical and electrocatalytic performances as compare to MnO 2 and Co 3 O 4 for both supercapacitor and electrocatalytic water splitting applications.
SN  - 2949-821X
ER  -