Rahadian Zainul, Ali B.M. Ali, Tariq J. Al-Musawi, Anjan Kumar, Pawan Sharma, Shaxnoza Saydaxmetova, Reem Hamdan KHaddour, Abdulrahman A. Almehizia, Khursheed Muzammil
The oxygen evolution reaction (OER) is a critical step in water splitting, essential for renewable energy systems. This study presented advanced OER electrocatalysts composed of manganese‑cobalt layered double hydroxides (MnCo-LDH) integrated with nickel phosphides (NiP2 and Ni5P4). The MnCo-LDH@NiP2 and MnCo-LDH@Ni5P4 composites were synthesized via layer-by-layer electrochemical deposition on steel substrates. Characterization through X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS) confirmed the successful formation and integration of the composites. The MnCo-LDH@NiP2 and MnCo-LDH@Ni5P4 electrodes demonstrated superior OER activity with overpotentials of 276 mV and 318 mV at 100 mA cm−2, respectively, significantly lower than 423 mV for MnCo-LDH alone. Tafel slopes of 53.2 mV dec−1 for MnCo-LDH@NiP₂ and 60.9 mV dec−1 for MnCo-LDH@Ni5P4 indicated enhanced reaction kinetics compared to 84.0 mV dec−1 for MnCo-LDH. Electrochemical impedance spectroscopy (EIS) showed reduced charge transfer resistance (Rct) for MnCo-LDH@NiP₂ (0.62 Ω cm2) and MnCo-LDH@Ni5P4 (0.77 Ω cm2), outperforming MnCo-LDH (1.01 Ω cm2). These findings along with the results from stability test highlighted the potential of MnCo-LDH integrated with nickel phosphides as highly efficient and stable OER catalysts. © 2025 Elsevier B.V.
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang, Indonesia; Air Conditioning Engineering Department, College of Engineering, University of Warith Al-Anbiyaa, Karbala, Iraq; Al-Mustaqbal Energy Research Center, Al-Mustaqbal University, Babylon, Hillah, 51001, Iraq; Department of electronics and communication engineering, GLA University, Mathura, 281406, India; Department of Chemistry, School of Sciences, Jain (Deemed-to-be) University, Karnataka, Bengaluru, 560069, India; Department of Sciences, Vivekananda Global University, Rajasthan, Jaipur, 303012, India; Department of Chemistry and Its Teaching Methods, Tashkent State Pedagogical University, Tashkent, Uzbekistan; Mazaya University College, Dhiqar, Iraq; Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, PO Box 2457, Riyadh, 11451, Saudi Arabia; Department of Public Health, College of Applied Medical Sciences, King Khalid University, Abha, Khamis Mushait, 62561, Saudi Arabia; Center for Advanced Material Processing, Artificial Intelligence, and Biophysics Informatics (CAMPBIOTICS), Universitas Negeri Padang, Padang, Indonesia; Researcher Fellow at Asia Pacific University of Technology and Innovations (APU), Malaysia
