The pH effects on H2 evolution kinetics for visible light water splitting over the Ru/(CuAg)0.15In0.3Zn 1.4S2 photocatalyst

Guangshan Zhang, Wen Zhang, Daisuke Minakata, Yongsheng Chen, John Crittenden, Peng Wang

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28 Scopus citations

Abstract

Much progress has been made in the development of novel visible light photocatalysts that split water into hydrogen (H2) and oxygen (O 2). In this study, we examine the impact of initial solution pH on H2 production using an Ru/(CuAg)0.15In 0.3Zn1.4S2 photocatalyst under visible light irradiation. In addition, the reaction mechanism was analyzed by examining the oxidation products of the electron donor (Iâ€) at different solution pH values. The results show that the initial pH significantly influenced the rate of H2 production and quantum yield (QY). In particular, the photocatalyst yielded the highest apparent QY (∼12.8%) at 420 ± 5 nm and highest H2 production rate (∼525 μmol h-1) at pH 2; with increasing pH, the H2 production and QY decreased significantly. The oxidation product of I†at pH < 6 was mainly I3â€, whereas at pH > 6 water splitting did not occur at all, so no IO3†or I2 were observed.

Original languageEnglish (US)
Pages (from-to)11727-11736
Number of pages10
JournalInternational Journal of Hydrogen Energy
Volume38
Issue number27
DOIs
StatePublished - Sep 10 2013

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

Keywords

  • H production
  • Ru/(CuAg)InZnS
  • Visible light irradiation
  • Water splitting
  • pH effect

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