Visible-light photocatalysis and charge carrier dynamics of elemental crystalline red phosphorus

The Journal of Chemical Physics
Lin JingJimmy C Yu

Abstract

Elemental red phosphorus (red P) is a new class of photocatalysts with a desirable bandgap of ∼1.7 eV and has a strong visible-light response. Here, we show that the efficiency of red P is limited by severe electron trapping at deep traps that are intrinsic to the different crystal facets of the red P. To overcome this, we synthesized the red P/RGO (reduced graphene oxide) composite in a one-step ampoule chemical vapor deposition synthesis that formed a conducive interface between the red P photocatalyst and the RGO acceptor for efficient interfacial charge transport. As substantiated through photoelectrochemical characterization and ultrafast (femtoseconds) transient absorption spectroscopy, the interfacing with RGO provided a rapid pathway for the photocharges in red P to be interfacially separated, thereby circumventing the slower the charge trapping process. As a result, up to a sevenfold increase in the photocatalytic hydrogen production rate (apparent quantum yield = 3.1% at 650 nm) was obtained for the red P/RGO relative to the pristine red P.

References

Aug 13, 2004·Angewandte Chemie·Arno PfitznerHellmut Eckert
Oct 26, 2005·Angewandte Chemie·Michael RuckGotthard Seifert
Dec 29, 2005·Angewandte Chemie·Arno Pfitzner
Sep 10, 2014·Angewandte Chemie·Frederik BachhuberRichard Weihrich
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Mar 21, 2017·Journal of the American Chemical Society·Robert GodinJames R Durrant
May 26, 2017·Journal of the American Chemical Society·Kathryn L Corp, Cody W Schlenker

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Citations

Jul 10, 2021·The Journal of Chemical Physics·Victor BatistaDunwei Wang

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