Novel Water Electrolyzer for Hydrogen Production Using an Intermediate Temperature Membrane

High Temperature Proton Exchange Membrane Electrolysis addresses many of the problems of Low Temperature systems. However, issues such as increased degradation due to acid leaching must be overcome for successful deployment in commercial applications, aligning with the Department of Energyĺs goal of improving hydrogen production efficiency and reducing capital cost of electrolyzer stack and balance of plant. The problem is addressed by developing a novel proton exchange membrane electrode assembly for operation at an intermediate temperature of 160 degrees Celcius to be used in the electrolyzer. The novel membrane electrode assembly will use a commercially available polybenzimidazole-based membrane, add a novel interfacial layer, and an electrode optimized for operation at the intermediate temperature. This novel membrane electrode assembly will decisively reduce water ingress into the membrane and thereby prevent phosphoric acid leaching and membrane swelling and, the main degradation mechanisms for polybenzimidazole-membrane based electrolyzers. The primary focus of Phase I is on achieving a consistent membrane-interface layer assembly which will be tested for durability and degradation and validated in a laboratory environment. A comprehensive high-level architecture for a 1-megawatt electrolyzer will be created including a costed bill of materials. Potential catalysts for electrodes will be evaluated and ranked for use in the membrane electrode assembly. If Phase I funding extends, the project will yield a superior electrolyzer system featuring lower cost and higher conversion efficiency, resulting in lower cost of hydrogen. This system has applications in generation of low-cost green hydrogen, but also as key component in Long Duration Energy Storage systems. These systems enable grid-independent community microgrids, vehicle charging and hydrogen refueling stations, and reliable and resilient green power supply for underserved and tribal areas.