This talk will give an overview of the HydroGEN Photoelectrochemistry (PEC) Supernode and present recent progress. This Supernode project is a collaboration of nine PEC capability nodes that are part of the HydroGEN Advanced Water Splitting Materials (AWSM) consortium. These nodes are contributing to a common objective of developing an understanding of integration issues and emergent degradation mechanisms of PEC devices upon scale up above 1cm2 active areas. Larger devices are expected to introduce new component integration challenges and pathways for degradation that this PEC Supernode project will identify and propose pathways for future progress.

The objective of this Supernode includes: 1) Photoreactor chassis fabrication and baselining, 2) development, fabrication, and testing of larger area PEC devices, 3) development of in-situ morphology and corrosion analysis techniques and characterization, and 4) analysis of durability mechanisms and impacts using modeling LCA and TEA. A new photoreactor chassis will be presented that has been designed to facilitate indoor and on-sun efficiency and durability benchmarking measurements. The design will be validated in a preliminary set of multi-institution round robin measurements toward understanding and harmonizing measurement conditions and protocol. Furthermore, we will present initial STH, durability and degradation characterization results upon scale up to 8 cm2 active area of integrated vapor fed PEC cell.