Publication date: 27th March 2025
Water electrolysis is a promising approach for converting renewable energy into clean hydrogen fuel. However, its overall efficiency is hindered by the sluggish kinetics and high overpotential of the oxygen evolution reaction (OER). Traditionally, precious metal-based catalysts have been employed due to their high catalytic activity, but their high cost and limited long-term stability significantly restrict large-scale applications. In this context, MXenes have emerged as attractive alternatives, owing to their high electrical conductivity, large surface area, and abundance of active sites. For instance, Ti₃C₂Tx has demonstrated performance comparable to noble metal catalysts in hydrogen evolution reactions (HER). Nevertheless, MXenes face challenges related to long-term operational stability, primarily due to the tendency of their sheets to stack and agglomerate. To address these limitations, hybrid architectures that integrate MXenes with other materials have been developed. These composites enhance both the catalytic activity and structural stability, leading to improved performance in both OER and HER. Such strategies position MXenes as a cost-effective and sustainable alternative to traditional catalysts, opening new avenues for efficient hydrogen production via water electrolysis. In this context, metal doped Mo₂TiC₂ MXene was investigated as a multifunctional electrocatalyst for water splitting. The material was doped with 2.5 wt% of transition metals—Ni, Fe, and Co—to enhance its catalytic activity toward oxygen evolution reaction (OER). Comprehensive catalyst characterization was carried out using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD) to confirm successful doping and to analyze the morphological and structural features. Electrochemical measurements were then performed to evaluate HER and OER performance, allowing a comparative analysis of the doped samples. The results demonstrated that metal doping improved electrocatalytic activity, highlighting the potential of metal doped Mo₂TiC₂ as an efficient catalyst for oxygen evolution reaction.
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