Novel twin reactor for separate evolution of hydrogen and oxygen in photocatalytic water splitting

Chen Chia Lo, Chao Wei Huang, Chi Hung Liao, Jeffrey C.S. Wu

Research output: Contribution to journalArticlepeer-review

76 Citations (Scopus)

Abstract

Photocatalytic water splitting with separate H2 and O2 evolution is crucial because it eliminates the explosion potential and hydrogen-purification cost. A novel twin reactor was designed to separate the evolution of hydrogen and oxygen in photocatalytic water splitting under visible light. A modified Nafion membrane was employed to segregate the two photocatalysts in the twin reactor so that hydrogen and oxygen can be evolved separately. Conventional Z-scheme catalysts, Pt/SrTiO3:Rh and WO3, were used as hydrogen-photocatalyst and oxygen-photocatalyst, respectively. Fe2+ and Fe3+ were added in the reaction solution as electron-transfer mediator. The ratio of evolved H2 and O2 was in agreement with the stoichiometric ratio (2:1) of hydrogen and oxygen of water. An average hydrogen generation rate of 1.59 μmol/g-h was achieved in the twin-reactor system, which was twice as much as that in the conventional Z-scheme system. The improved H2 yield was due to the prevention of the water-splitting backward reaction in the twin reactor.

Original languageEnglish
Pages (from-to)1523-1529
Number of pages7
JournalInternational Journal of Hydrogen Energy
Volume35
Issue number4
DOIs
Publication statusPublished - 2010 Feb

All Science Journal Classification (ASJC) codes

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

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