THE PRIMARY OBJECTIVE OF OUR PROJECT IS TO DELIVER A HALIDE-PEROVSKITE BASED TANDEM PEC MODULE WITH AN AREA OF 200 CM2, WITH AN UNASSISTED STH EFFICIENCY OF 20%, WITH 1000 HOURS OF DIURNAL OPERATION TO PRODUCE H2 AT A RATE EXCEEDING 0.1 G/HOUR USING SCALABLE MATERIALS AND PROCESSES COMPATIBLE WITH RECYCLING AND REGENERATION THAT CAN ACHIEVE THE DOE HYDROGEN EARTHSHOT TARGET OF $1/KG IN 1 DECADE. WE WILL ACHIEVE OUR GOAL BY LEVERAGING POROUS CURRENT COLLECTORS AND IMPROVED ADHESION, AS WELL AS THE HARVESTING OF WASTE HEAT, THAT WILL BRIDGE THE HISTORICAL GAP BETWEEN PEC (10S OF HOURS) AND PEM ELECTROLYZER PERFORMANCE (>1000 HOURS). DESPITE SIGNIFICANT PROGRESS, SERIOUS CHALLENGES NEED TO BE OVERCOME. PEC SYSTEMS MUST REACH 25% STH AT SMALL SCALES TO PROVIDE FOR LOSSES ASSOCIATED WITH SCALEUP, AND LARGE-AREA DEVICES WITH HIGH EFFICIENCY THAT DO NOT COMPROMISE LONG-TERN DURABILITY MUST BE DEMONSTRATED. WE ANTICIPATE THAT THE SUCCESS OF OUR PROPOSED PROJECT, WILL ALLOW PEC PERFORMANCE TO FINALLY REACH PAR WITH ELECTROLYZERS, BUT WILL HAVE ADVANTAGES IN COST BECAUSE OF INHERENT ADVANTAGES OF INTEGRATED PEC SYSTEMS WITH A CLEAR PATHWAY TO ACHIEVE H2 GENERATION AT $1/KG. THE ADVANCEMENTS OBTAINED IN THE PROPOSED PROJECT WILL CONSTITUTE A DISRUPTIVE, HIGH-TRL (TRL 7) PEC TECHNOLOGY THAT CAN BE PROMPTLY DEPLOYED FOR GREEN H2 MANUFACTURING.