Silver Phosphate/Graphitic Carbon Nitride as an Efficient Photocatalytic Tandem System for Oxygen Evolution

Xiaofei Yang, Hua Tang, Jingsan Xu, Markus Antonietti, Menny Shalom

Research output: Contribution to journalArticlepeer-review

182 Scopus citations

Abstract

Herein, we show the facile synthesis of an efficient silver phosphate/graphitic carbon nitride (Ag3PO4/g-C3N4) photocatalyst for oxygen production and pollutant degradation by using electrostatically driven assembly and ion-exchange processes. The composite materials demonstrate a sheet-like C3N4 structure, decorated with different Ag3PO4 particles sizes. Detailed analysis of the reactions mechanism by electron-spin resonance and radical-capture agents strongly imply the formation of an in situ Z-scheme by the evolution of small silver nanoparticles in the interface of the materials under illumination. The Ag nanoparticles improve charge separation within the composite material by acting as a storage and recombination center for electrons and holes from Ag3PO4 and C3N4, respectively. In addition, the photostability of Ag3PO4 is enhanced relative to that of the bulk materials, which results in a stabilized heterojunction. We believe that this work provides new insight into the operation mechanism of composite photocatalysts for water splitting and opens the possibility for advanced photocatalysis based on the higher oxidation power of Ag3PO4.

Original languageEnglish
Pages (from-to)1350-1358
Number of pages9
JournalChemSusChem
Volume8
Issue number8
DOIs
StatePublished - 24 Apr 2015
Externally publishedYes

Keywords

  • nanostructures
  • nitrides
  • oxygen evolution
  • photocatalysis
  • silver phosphate

ASJC Scopus subject areas

  • Environmental Chemistry
  • General Chemical Engineering
  • General Materials Science
  • General Energy

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