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Identification of photoexcited electron relaxation in a cobalt phosphide modified carbon nitride photocatalyst

Pei, Guang X., Dzade, Nelson Y., Zhang, Yue, Hofmann, Jan P., De Leeuw, Nora H. and Weckhuysen, Bert M. 2021. Identification of photoexcited electron relaxation in a cobalt phosphide modified carbon nitride photocatalyst. Chemphotochem 10.1002/cptc.202000259

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Abstract

Transition metal phosphides have been recognized as efficient co‐catalysts to boost the activity of semiconductor photocatalysts. However, a rigorous and quantitative understanding is still to be developed about how transition metal phosphides influence photoexcited electron dynamics. Here, we present a nanosecond time‐resolved transient absorption spectroscopy (TAS) study of the photoexcited electron dynamics in carbon nitrides (g‐C3N4) before and after Co and/or P modifications. Our spectroscopic study showed that Co or P lowered the initial electron density, whereas they promoted the photoexcited electron relaxation of g‐C3N4, with their half‐life times (t50%) of 2.5 and 1.8 ns, respectively. The formation of a CoP co‐catalyst compound promoted the electron relaxation (t50%=2.8 ns) without significantly lowering the charge separation efficiency. Density functional theory (DFT) calculations were undertaken to explore the underlying fundamental reasons and they further predicted that CoP, compared to Co or P modification, better facilitates photoexcited electron transfer from g‐C3N4 to reactants.

Item Type: Article
Date Type: Published Online
Status: In Press
Schools: Chemistry
Additional Information: This is an open access article under the terms of the Creative Commons Attribution License
Publisher: John Wiley and Sons Inc.
ISSN: 2367-0932
Funders: EPSRC
Date of First Compliant Deposit: 2 February 2021
Date of Acceptance: 7 January 2021
Last Modified: 03 Feb 2021 10:15
URI: http://orca.cf.ac.uk/id/eprint/138165

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