WO₃/BiVO₄: impact of charge separation at the timescale of water oxidation.

ABSTRACT: The four hole oxidation of water has long been considered the kinetic bottleneck for overall solar-driven water splitting, and thus requires the formation of long-lived photogenerated holes to overcome this kinetic barrier. However, photogenerated charges are prone to recombination unless they can be spatially separated. This can be achieved by coupling materials with staggered conduction and valence band positions, providing a thermodynamic driving force for charge separation. This has most aptly been demonstrated in the WO₃/BiVO₄ junction, in which quantum efficiencies for the water oxidation reaction can approach near unity. However, the charge carrier dynamics in this system remain elusive over timescales relevant to water oxidation (μs-s). In this work, the effec

SUBMITTER: Selim S 

PROVIDER: S-EPMC6419945 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature