Abstract
Polymer electrolyte membrane water electrolyzer (PEMWE) could play a key role in green hydrogen production from intermittent renewable energy sources, yet, the high loading of scarce precious metals hinders widespread commercialization. Innovative electrode designs that decrease the precious metal loading while maintaining high performance can be a significant step forward for the quicker adoption of hydrogen-based energy storage systems. Herein, we report a novel Layered Coaxial Nanowire Electrode (LCANE) composed of ionomer nanowires encapsulated by IrO2-decorated Pt nanofilms, which enables increased hydrogen production with decreased catalyst loading. By combining atomic layer deposition of Pt, ultrasonic spray of IrO2, and nano-extrusion of ionomer, the LCANE architecture enables improved in-plane conductivity, faster transport, and less agglomeration of catalyst. With a fraction of loading compared to conventional electrodes, LCANE demonstrates a promising way to decrease the loading of the PEMWE anode. Figure 1
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