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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Lin Jing
  • Ruixue Zhu
  • Yun Hau Ng
  • Zhuofeng Hu
  • David Lee Phillips
  • Jimmy C. Yu

Detail(s)

Original languageEnglish
Article number024707
Journal / PublicationJournal of Chemical Physics
Volume153
Issue number2
Online published10 Jul 2020
Publication statusPublished - 14 Jul 2020
Externally publishedYes

Link(s)

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.

Research Area(s)

Citation Format(s)

Visible-light photocatalysis and charge carrier dynamics of elemental crystalline red phosphorus. / Jing, Lin; Zhu, Ruixue; Ng, Yun Hau et al.
In: Journal of Chemical Physics, Vol. 153, No. 2, 024707, 14.07.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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