Original Article ISSN (Online): 2456-8651 International Journal of Engineering Science Technologies January-February 2022 6(1), 1–10 How to cite this article (APA): Hanan, A., Laghari, A. J., Solangi, M. Y., Aftab, U., Abro, M. I., Cao, D., Ahmed, M., Lakhan, M. N., Ali, A., Asif, A., and Shar, A. H. (2022). CDO/CO3O4 Nanocomposite as An Efficient Electrocatalyst for Oxygen Evolution Reaction in Alkaline Media. International Journal of Engineering Science Technologies, 6(1), 1-10.doi: 10.29121/IJOEST.v6.i1.2022.259 1 CdO/Co 3 O 4 NANOCOMPOSITE AS AN EFFICIENT ELECTROCATALYST FOR OXYGEN EVOLUTION REACTION IN ALKALINE MEDIA Abdul Hanan 1 , Abdul Jaleel Laghari 2 , Muhammad Yameen Solangi 2 , Umair Aftab 2 , Muhammad Ishaque Abro 2 , Dianxue Cao 1 , Mukhtiar Ahmed 3 , Muhammad Nazim Lakhan 4 , Amir Ali 5 , Ali Asif 6 , Altaf Hussain Shar 4 1 Key Laboratory of Superlight Material and Surface Technology, College of Materials Science and Chemical Engineering, Harbin Engineering University, PR China. 2 Department of Metallurgy and Materials Engineering, MUET, Jamshoro, Pakistan. 3 Institute of Process Engineering, University of Chinese Academy of Sciences, PR China. 4 School of Chemistry and Materials Science, University of Science and Technology of China, PR China. 5 College of Underwater Acoustic Engineering, Harbin Engineering University, PR China. 6 College of Nuclear Science and Technology, Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, PR, China. Received 1 December 2021 Accepted 15 December 2021 Published 15 January 2022 Corresponding Author Abdul Hanan, ahanansamo@gmail.com DOI 10.29121/IJOEST.v6.i1.2022.259 Funding: This research received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors. Copyright: © 2022 The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. ABSTRACT Electrochemical water splitting is one of the promising ways to enhance energy with less outflow. In this regard different electrocatalysts have been reported for Oxygen evolution reaction (OER) to get alternative of noble metal based electrocatalysts. In this work, we have introduced Cadmium-oxide/Cobalt-oxide (CdO/Co3O4) nanocomposite by co-precipitation chemical strategy with impressive OER performance in alkaline medium. Almost 310 mV overpotential value is required to achieve 10 mA/cm2 current density with Tafel slope value of 62 mV/Dec. The as synthesized nanocomposite has stability of 6h as its longer electrochemical performance. Keywords: Electrochemistry, Oxygen Evolution Reaction, Electrocatalyst, Cobalt Oxide, Cadmium Oxide 1. INTRODUCTION Renewable energy has been playing a vital role since last decade as emerging source of global energy. Electrochemical water splitting is one the green way to get energy with less outflow for growing society Bhatti et al. (2021), Kang and Kim (2021). Electrochemical OER is intensive, critical and productive way for molecular oxygen from water oxidation Martini and Maia (2021). OER requires four electron transfer reaction and high over-potential required for reaction mechanism. That larger over-potential is the major barrier for the researchers to get it at optimum level. Therefore, it is global challenge to reduce the over-potential value to obtain efficient electrocatalyst material for highly active OER performance Ahamad et al. (2020), Ahmed et al. (2022). Meanwhile, OER activity has been done by several non-precious metal based electrocatalysts such as metal chalcogenide Majhi and Yadav (2021),