Photoelectrochemical water splitting cells at elevated pressure using BiVO₄ and platinized III-V semiconductor photoelectrodes.

ABSTRACT: Direct production of pressurized green hydrogen via photoelectrochemical water splitting reduces the need for mechanical compression and mitigates bubble-related losses. However, existing demonstrations have been limited to atmospheric pressure. Here, we bridge this gap by designing, constructing, and testing a high-pressure flow cell for photoelectrochemical water splitting using two configurations. In a back-illuminated BiVO₄-based photoelectrochemical cell, increased pressure suppresses bubble evolution and alleviates photocurrent saturation under concentrated sunlight: at 10 suns, the photocurrent rises from 3× at 1 bar to ~7× at 5 bar. Direct operando imaging of the electrode surfaces confirms that this improvement comes primarily from suppressed bubble evolution. Conversel

SUBMITTER: Liang F 

PROVIDER: S-EPMC12706061 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature