4.8 Article

Layered beta-ZrNBr Nitro-Halide as Multifunctional Photocatalyst for Water Splitting and CO2 Reduction

Journal

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 62, Issue 4, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202214273

Keywords

CO2 Reduction; Nitro-Halides; Photocatalysis; Visible-Light Response; Water Splitting

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In this study, a layered nitro-halide beta-ZrNBr with a narrow band gap and low defect density was synthesized. The material exhibited multifunctionalities for photocatalytic water reduction, water oxidation, and CO2 reduction under visible-light irradiation. The formation of anion vacancies in the nitro-halide photocatalyst was inhibited, leading to improved performance. Furthermore, exfoliation into nanosheets promoted carrier transfer and charge separation. This work expands the territory of functional photocatalysts and provides a new avenue for efficient artificial photosynthesis.
Developing mixed-anion semiconductors for solar fuel production has inspired extensive interest, but the nitrohalide-based photocatalyst is still in shortage. Here we report a layered nitro-halide beta-ZrNBr with a narrow band gap of ca. 2.3 eV and low defect density to exhibit multifunctionalities for photocatalytic water reduction, water oxidation and CO2 reduction under visible-light irradiation. As confirmed by the results of electron paramagnetic resonance (EPR) and density functional theory (DFT) calculations, the formation of anion vacancies in the nitro-halide photocatalyst was inhibited due to its relatively high formation energy. Furthermore, performance of beta-ZrNBr can be effectively promoted by a simple exfoliation into nanosheets to shorten the carrier transfer distance as well as to promote charge separation. Our work extends the territory of functional photocatalysts into the nitro-halide, which opens a new avenue for fabricating efficient artificial photosynthesis.

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