Proceedings of MATSUS Fall 2024 Conference (MATSUSFall24)
Publication date: 28th August 2024
The increasing demand for sustainable hydrogen solution has placed water electrolysis at the forefront of green energy solutions, particularly in the context of alkaline anion exchange membrane water electrolyzers (AEMWE).[1] AEMWE offers significant advantages over proton exchange membrane systems by operating under alkaline conditions, enabling the use of non-precious metals while still achieving high efficiency.[1] This study presents a comparison between two cathode materials, platinum on carbon (Pt/C) and Ni Raney, coupled with stainless-steel anodes, in an AEMWE setup using purified KOH as the electrolyte and Sustainion as the membrane.
Our findings indicate that Ni Raney outperforms Pt/C with higher stability and efficiency. When operating at a current density of 1 A cm⁻² for 24 hours, Ni Raney maintained a stable voltage of approximately 1.7 V, compared to 1.9 V for Pt/C. This lower overpotential reflects not only a more efficient hydrogen evolution reaction (HER) but also suggests that the inherent properties of Ni Raney provide superior catalytic performance. Studies have shown that Ni Raney possesses a highly porous structure, which significantly increases active surface area and enhances hydrogen adsorption kinetics compared to Pt-based systems.[2]]
In conclusion, the superior performance of Ni Raney as a cathode material highlights its potential for cost-effective and efficient hydrogen production using natural water sources. The results of this study provide a compelling case for the further exploration of non-precious metal catalysts in sustainable energy technologies.
The authors acknowledge funding by Ministry of Culture and Science of the State of North Rhine-Westphalia in the framework of the Natural Water to Hydrogen project (PB22-019).
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