Effectual Water Oxidation Reinforced by Three-Dimensional (3D) MnO: A Highly Sustainable Electrocatalyst

Muhammad Ali Ehsan, Asghar Ali, Muhammad Shahzeb Khan, Muhammad Younas, Muhammad Zubair, Amir Habib, Abbas Saeed Hakeem, Naseer Iqbal*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Fabricating highly effective, durable, eco-friendly, and low-cost electrocatalysts are challenging in renewable energy applications. Manganese(II) oxide (MnO), an oxygen evolution reaction (OER) catalyst, is an appealing contender in electrocatalytic water oxidation. Herein, we report the fabrication of single-phase MnO films over nickel foam (NF) as 3D electrode materials via a facile aerosol-assisted chemical vapor deposition (AACVD). HR-TEM confirms the nanoscale composition and polycrystalline structure, while the cauliflower-like morphology was observed under FE-SEM supported by EDX for conforming elemental composition. XRD and XPS analysis proved their chemical structure and oxidation states. The electrochemical investigations of MnO films prepared at 60 min revealed excellent OER performance in 1.0 M KOH. The benchmark decade current density was achieved just at an overpotential of 150 mV, whereas at an overpotential of 430 mV, Mn@NF-60 showed a maximum current density of 1158 mA cm-2 which is 4-6-folds better than its counterparts. The large electrochemical surface area (154 cm2), lower Tafel slope (80.93 mV/dec), and charge transfer resistance (18 Ω), excellent durability throughout extended chronopotentiometry analysis, and fast electron transfer reaction kinetics for OER comprehend Mn@NF-60 as an effectual electrocatalyst. These attributes of a single-phase MnO@NF-60 are credited to ample electroactive sites that enhance electron transfer processes. This study offered highly active single-phase metal oxide thin films by AACVD as 3D electrode materials for plentiful electrocatalytic applications.

Original languageEnglish
Pages (from-to)7156-7168
Number of pages13
JournalACS Applied Energy Materials
Issue number13
StatePublished - 10 Jul 2023

Bibliographical note

Funding Information:
This research work was funded by institutional fund projects under no (IFP-A-2022-2-4-15). Therefore, the authors gratefully acknowledge the technical and financial support from the Ministry of Education and the University of Hafr Al Batin, Hafr Al Batin, Saudi Arabia.

Publisher Copyright:
© 2023 American Chemical Society.


  • aerosol-assisted chemical deposition
  • low-overpotential catalyst
  • manganese oxide
  • nickel foam
  • oxygen evolution

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering


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