α-MnO2/FeCo-LDH on Nickel Foam as an Efficient Electrocatalyst for Water Oxidation

Saeedeh Shahparast; Karim Asadpour-Zeynali

doi:10.1021/acsomega.2c07580

α-MnO₂/FeCo-LDH on Nickel Foam as an Efficient Electrocatalyst for Water Oxidation

ACS Omega. 2022 Dec 20;8(1):1702-1709. doi: 10.1021/acsomega.2c07580. eCollection 2023 Jan 10.

Authors

Saeedeh Shahparast¹, Karim Asadpour-Zeynali^{1

2}

Affiliations

¹ Department of Analytical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz5166616471, Iran.
² Pharmaceutical Analysis Research Center, Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz51664, Iran.

Abstract

The ever-expanding human societies on the one hand and the diminishing fossil fuel resources on the other have driven man to find a suitable, cheap, clean, and accessible source of energy. Water splitting is a good solution to this crisis. Because of the slow kinetics of water oxidation reaction, it is important to select efficient and durable electrocatalysts to improve the reaction kinetics. In this research, α-MnO₂/FeCo-LDH catalysts on nickel foam were developed for water oxidation, which exhibited good catalytic performance and stability in a 0.1 M KOH solution. The electrocatalysts were synthesized by hydrothermal methods and characterized by XRD, FTIR, Raman, SEM, TEM, EDS, and MAP techniques. The proposed modified electrode has large exchange current, low overpotential, and small Tafel slope. Here, only an overpotential of 210 mV is required to achieve a current density of 5 mA cm² with a Tafel slope of 70.4 mV dec^-1 in an alkaline solution.