Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.032
Publication date: 11th July 2022
In photochemistry light is used to induce redox reactions, such as CO2 reduction or H2 evolution. To effectively harvest the incident photons, the photoactive material, typically a semiconductor, must have a suitable optical bandgap. A common problem of widely-studied photoactive materials, such as TiO2, is the large bandgap energy which results in a poor conversion efficiency.
An interesting class of materials for photochemistry are elpasolites, also known as double perovskites, due to the tunable bandgap. In particular, Cs2AgBiBr6 shows great promise because of its good photo- and chemical stability and relatively low toxicity. Absorption of visible light is, however, limited because of the indirect nature of the bandgap. The bandgap of such silver-bismuth materials can be manipulated by substituting the Bi3+ cation with another cation.
In this talk we discuss a mechanochemical synthesis approach to (partly) substitute Bi3+ in the Cs2AgBiBr6 crystal structure. Due to the high force and pressure created in a ball mixer, we are able to synthesize phase-pure Cs2AgBi1-xMxBr6 compositions. By controlling the Bi:M ratios we can manipulate the bandgap energy and thus the optical properties. We show that the incorporation of Fe3+ strongly red-shifts the absorption onset of this material, which increases the photochemical activity.
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