Efficient Mn‐Ni‐Co nanocomposite–based electrocatalyst for oxygen evolution reaction in alkaline media

Abstract

AbstractDue to the frequent use of fossil fuels and their direct impact on the environment, new ways of production of energy sources are essentially needed for the current era. Hydrogen is the perfect candidate for renewable energy; however, efficient O2 gas production is associated with a lack of active electrocatalysts that could be low cost effective and comparable to the performance of noble metal RuO2. The newly developed composite has a Tafel slope of 65 mV dec−1 for oxygen evolution reaction (OER) for the nonprecious Mn‐Ni‐Co‐based electrocatalyst. This mixed oxide alloy possesses excellent oxygen evolution activity in alkaline media with the composite material. It is best of fit to produce OER in 1 M KOH media at 1.41 V onset potential, 230 mV overpotential, and the catalyst is highly durable for 40 hr. The electrochemical impedance spectroscopy study strongly provides the fast OER kinetics of 86.5 Ω charge transfer resistance. An active catalyst is needed for the cheaper generation oxygen gas production on large scale. Thus, outperform, stable, and inexpensive catalysts are highly demanded O2 gas production from the electrolysis of water through oxygen evolution. Herein, we present an efficient and highly stable catalyst based on transition metal oxide ternary Mo‐Ni‐Co nanostructures and their composite for water splitting in basic conditions for the first time. The presented catalysts are up to the mark of ruthenium oxide performance and superior to several transition metal dichalcogenides. This fabrication technology is a new roadmap for the development of active and scalable oxygen‐evolving catalysts by overcoming the issues of fewer catalytic edges, low density, and poor conductivity. The obtained results demonstrate highly favorable on the Mn‐Ni‐Co for OER due to 173.20 Ω small charge transfer resistance values and 1.97 mF capacitance values.