ZnSe Nanorods as Visible-Light Absorbers for Photocatalytic and Photoelectrochemical H2 Evolution in Water.
Angewandte Chemie (International ed. in English)
John Wiley & Sons Ltd.
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Kuehnel, M., Creissen, C., Sahm, C., Wielend, D., Schlosser, A., Orchard, K. L., & Reisner, E. (2019). ZnSe Nanorods as Visible-Light Absorbers for Photocatalytic and Photoelectrochemical H2 Evolution in Water.. Angewandte Chemie (International ed. in English), 58 (15), 5059-5063. https://doi.org/10.1002/anie.201814265
A precious metal- and Cd-free photocatalyst system for efficient H2 evolution from water with a performance comparable to Cd-based quantum dots is presented. Rod-shaped ZnSe nanocrystals (nanorods, NRs) with a Ni(BF4)2 co-catalyst suspended in aqueous ascorbic acid evolve H2 with up to 54±2 mmolH2 gZnSe –1 h– 1 under visible light illumination (λ > 400 nm, AM 1.5G, 100 mW cm– 2), and 50±4 % quantum yield (λ = 400 nm). Under full-spectrum simulated solar irradiation (AM 1.5G, 100 mW cm–2), up to 149±22 mmolH2 gZnSe –1 h–1 are generated. Significant photocorrosion was not observed within 40 h and activity was even observed without added co-catalyst. The ZnSe NRs can also be employed to construct an inexpensive Delafossite-based photocathode, which does not rely on a sacrificial electron donor. Immobilized ZnSe-NRs on CuCrO2 generate photocurrents of ~10 μA cm–2 in aqueous electrolyte solution (pH 5.5), with a photocurrent onset potential at ~+0.75 V vs. RHE. This work establishes ZnSe as a state-of-the-art light-absorber for photocatalytic and photoelectrochemical H2 generation.
Christian Doppler Research Association (Austrian Federal Ministry of Science, Research and Economy and the National Foundation for Research, Technology and Development), the OMV Group, the EPSRC NanoDTC, EPSRC Underpinning Multi-User Equipment Grant (EP/P030467/1), the Erasmus+ program (D.W.), the Erasmus program (A.S.) and the World Premier International Research Center Initiative, MEXT, Japan
Christian Doppler Forschungsgesellschaft (unknown)
Tohoku University (unknown)
External DOI: https://doi.org/10.1002/anie.201814265
This record's URL: https://www.repository.cam.ac.uk/handle/1810/289502