Direct In Situ Measurement of Quantum Efficiencies of Charge Separation and Proton Reduction at TiO₂-Protected GaP Photocathodes.

ABSTRACT: Photoelectrochemical solar fuel generation at the semiconductor/liquid interface consists of multiple elementary steps, including charge separation, recombination, and catalytic reactions. While the overall incident light-to-current conversion efficiency (IPCE) can be readily measured, identifying the microscopic efficiency loss processes remains difficult. Here, we report simultaneous in situ transient photocurrent and transient reflectance spectroscopy (TRS) measurements of titanium dioxide-protected gallium phosphide photocathodes for water reduction in photoelectrochemical cells. Transient reflectance spectroscopy enables the direct probe of the separated charge carriers responsible for water reduction to follow their kinetics. Comparison with transient photocurrent measurement

SUBMITTER: Xu Z 

PROVIDER: S-EPMC9912250 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature