Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
Although photocathodes that are based on Si, GaInP2, GaP and copper indium gallium sulphide/selenide (CIGS) exhibit high solar-to-hydrogen conversion efficiencies, they either contain rare elements or require high cost processing techniques. In order to compete with crystalline silicon-based photovoltaic-coupled electrolysis for widespread solar hydrogen generation, new materials are required that are simultaneously high efficiency, Earth-abundant, and stable in an aqueous electrolyte.
In this work, we report highly active photocathodes based on Sb2Se3 that feature low cost and abundant HER catalysts. Photocurrents exceeding 12 mA cm-2 have been obtained at 0 V vs RHE and photocurrents exceeding 20 mA cm-2 at more negative bias (in 1 M H2SO4, under simulated one sun AM 1.5 G irradiation). These photocathodes show high incident photon to current conversion efficiencies over the entire visible spectrum, and until the band gap of Sb2Se3 (1.2 eV). Although the photocathodes showed a ~20% decrease in the photocurrent during chronoamperometry at 0 V vs RHE for 2 hours, the photocurrent was restored upon re-application of the HER catalyst.
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