Publication date: 15th December 2014
Materials for bias-free solar water splitting are intensively searched for. By applying combinatorial and high-throughput methods the Fe-Cr-Al-O system was identified recently as a promising system, as it consists of earth-abundant elements, has suitable bandgaps, and shows p- and n-type semiconducting properties. In this contribution, we present a comprehensive high-throughput study of a reactive magnetron-sputtered Fe-Cr-Al-O thin film materials library that revealed the potential to become a system for bias-free solar water splitting: the photocurrent onset and open circuit potentials of both identified semiconductor compositions (n: Fe51Cr47Al2Ox, p: Fe36.5Cr55.5Al8Ox) lie favorably for water splitting. Cathodic photocurrents are observed at 1.0 V vs. RHE for the p-type material that has an open circuit potential of 0.85 V vs RHE. The n-type material shows an onset of photocurrents at 0.75 V and an open circuit potential of 0.6 V. The optical appearance, high-throughput X-ray diffraction data, and linear sweep voltammetry under chopped light in a miniaturized electrochemical cell were correlated on 289 compositions, allowing a discussion of doping behavior. This material could serve as a new base for an all oxide p-i-n-type solar water splitting device.
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