Designing Alloy Thin-Film Oxygen Evolution Catalysts: A Promising Solution to Challenges in PEM Water Electrolysis
Kyu-Su Kim a, Yong-Tae Kim a
a Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.
Materials for Sustainable Development Conference (MATSUS)
Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
Electrochemical Water Treatment - #ELECTROWAT
Sevilla, Spain, 2025 March 3rd - 7th
Organizers: Julio J. Lado and Ignacio Sirés Sadornil
Poster, Kyu-Su Kim, 581
Publication date: 16th December 2024

Proton exchange membrane water electrolyzers (PEMWEs) are a promising technology for the advancement of the hydrogen economy. However, critical challenges remain for oxygen evolution catalysts (electrodes) at the anode of PEMWEs, including: (1) high overpotential caused by the complex electron transport mechanisms in the oxygen evolution reaction (OER), (2) severe catalyst dissolution and component deterioration under highly acidic and oxidative OER conditions, and (3) significant interfacial resistance in conventional powdery materials and Ohmic losses during high current density operations. Herein, I propose nanoporous Ir-based alloy thin-film oxygen evolution catalysts (electrodes) with a high electrochemical active surface area, fabricated via electrochemical treatments. This approach offers several advantages: (1) facile fabrication, (2) ligand effects enabled by alloying, (3) geometric effects enhanced through electrochemical treatments, and (4) improved conductivity due to efficient electron transport through the interconnected nanostructure. These findings are expected to guide the development of advanced strategies for enhancing PEMWE performance and enabling the rational design of next-generation oxygen evolution catalysts (electrodes).

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