| Autor: |
Kuehnel, Moritz F, Creissen, Charles E, Sahm, Constantin D, Wielend, Dominik, Schlosser, Anja, Orchard, Katherine L, Reisner, Erwin |
| Přispěvatelé: |
Kuehnel, Moritz F [0000-0001-8678-3779], Creissen, Charles E [0000-0002-2144-7261], Sahm, Constantin D [0000-0001-8472-0395], Orchard, Katherine L [0000-0002-6349-1316], Reisner, Erwin [0000-0002-7781-1616], Apollo - University of Cambridge Repository |
| Rok vydání: |
2019 |
| Předmět: |
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| Popis: |
A precious-metal- and Cd-free photocatalyst system for efficient H2 evolution from aqueous protons 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 an activity up to 54±2 mmol H 2 gZnSe -1 h-1 and a quantum yield of 50±4 % (λ=400 nm) under visible light illumination (AM 1.5G, 100 mW cm-2 , λ>400 nm). Under simulated full-spectrum solar irradiation (AM 1.5G, 100 mW cm-2 ), up to 149±22 mmol H 2 gZnSe -1 h-1 is generated. Significant photocorrosion was not noticeable within 40 h and activity was even observed without an added co-catalyst. The ZnSe NRs can also be used to construct an inexpensive delafossite CuCrO2 photocathode, which does not rely on a sacrificial electron donor. Immobilized ZnSe NRs on CuCrO2 generate photocurrents of around -10 μA cm-2 in an aqueous electrolyte solution (pH 5.5) with a photocurrent onset potential of approximately +0.75 V vs. RHE. This work establishes ZnSe as a state-of-the-art light absorber for photocatalytic and photoelectrochemical H2 generation. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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