Cesium-decorated reduced graphene oxide for photocatalytic hydrogen generation

N. Gnanaseelan, Latha Marasamy, A. Mantilla, S. K. Kamaraj, F. J. Espinosa-Faller, F. Caballero-Briones

Research output: Contribution to journalArticlepeer-review

Abstract

Cs-decorated reduced graphene oxide (CsRGO) was synthesized by addition of a CsOH solution to a GO suspension. The resulting material is amorphous, while GO reduces upon Cs incorporation as Cs2O-like clusters. Structure modelling indicates that Cs atom replaces hydrogen in hydroxyl and carboxyl groups in the graphene plane. CsRGO exhibits transitions associated to the π-to-π*, remanent C[dbnd]O groups and Cs2O absorption. The material is n-type semiconductor, with a direct optical band gap of 2.85 eV. Carrier injection from the Cs2O to RGO enhances H2-evolution. Stable photocatalytic generation of hydrogen after three four-hour cycles, is attributed to work function reduction, high conductivity, and high optical absorption upon Cs-incorporation.

Original languageEnglish
Article number131864
JournalMaterials Letters
Volume314
DOIs
StatePublished - 1 May 2022

Keywords

  • Cs
  • Decorated GO
  • Hydrogen photogeneration
  • Work function

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