Efficient and stable photocatalytic hydrogen production from water splitting over ZnxCd1-xS solid solutions under visible light irradiation

Chih Chieh Chan, Chung Chieh Chang, Chia Hao Hsu, Yu Ching Weng, Kew Yu Chen, Hsiao Han Lin, Wen Chih Huang, Sheng Fa Cheng

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

A simple co-precipitation method was employed to synthesize a series of cubic zinc-blende phase of ZnxCd1-xS photocatalysts using Na2S as the S source. Structural, morphological and optical properties of the samples have been investigated by XRD, SEM, EDS, XRF, ICP, N2 physisorption and UV-vis diffuse reflectance techniques. The ZnxCd1-xS solid solution is not a simple compound mixture of ZnS and CdS, its XRD patterns show new structural peaks instead of mixture of original peaks. The lattice parameter a measured from the XRD patterns of the ZnxCd1-xS samples exhibits a slightly nonlinear relationship with the Zn mole fraction, which is slightly inconsistent with Vegard's law, thus suggesting that a nonhomogeneous alloy structure exists in ZnxCd1-xS solid solution. The photocatalytic H2 evolution from water splitting in the sacrificial reagents of 0.25 M Na 2S/0.35 M K2SO3 under visible light at 30°C and 55°C were also examined in the study. It is found that Zn xCd1-xS solid solution with composition x = 0.4-0.5 shows the highest photocatalytic H2 production performance. The studied ZnxCd1-xS exhibits at least 50 h stable photocatalytic activity under outdoor sunlight irradiation.

Original languageEnglish
Pages (from-to)1630-1639
Number of pages10
JournalInternational Journal of Hydrogen Energy
Volume39
Issue number4
DOIs
Publication statusPublished - Jan 22 2014
Externally publishedYes

Keywords

  • Hydrogen
  • Photocatalyst
  • Visible light
  • Water splitting
  • ZnCdS

ASJC Scopus subject areas

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

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