Effect of Pt Loading at the Cathode on the Performance of Anion Exchange Membrane Water Electrolysis

Anion-exchange membrane (AEM) water electrolysis is an emerging electrochemical process used for water splitting to produce hydrogen. In this process, the electrolysis of water is facilitated through an anion-exchange membrane (AEM) that separates the cathode and anode chambers, allowing only specific ions (like hydroxide ions) to pass through. This process is considered highly promising for large-scale hydrogen production due to its lower cost, enhanced efficiency, and the use of abundant raw materials. The main challenges include improving membrane stability, optimizing electrode performance, and addressing the effects of electrolyte degradation. This study investigates the effect of varying platinum (Pt) loading on the cathode of an AEM water electrolyser for hydrogen production. The research compares different Pt loadings at the cathode, focusing on their influence on electrolysis performance. Results indicate that increasing Pt loading enhances the hydrogen evolution reaction (HER) rate, improving the overall current density and hydrogen output. However, there is a diminishing return in performance beyond a certain Pt loading, with excess platinum not significantly improving efficiency but contributing to increased costs. The study also examines the impact of Pt loading on the stability of the system. These findings highlight the need for an optimized balance of Pt loading to maximize performance while maintaining cost-effectiveness and longevity in AEM systems for large-scale hydrogen production.