Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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Preparation and Photoelectrochemical Behavior of Cu2O/TiO2 Inverse Opal Heterojunction Arrays

  • Kim, Hyun-Sik (School of Chemical & Biological Engineering, Seoul National University) ;
  • Lee, Sang-Kwon (Department of Chemistry Education, Chonnam National University) ;
  • Kang, Soon-Hyung (Department of Chemistry Education, Chonnam National University)
  • Received : 2012.06.26
  • Accepted : 2012.08.08
  • Published : 2012.08.31
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Abstract

The $Cu_2O/TiO_2$ inverse opal heterojunction arrays were developed by electrochemical deposition of $Cu_2O$ nanoparticles on $TiO_2$ inverse opal arrays. The $Cu_2O$ nanoparticles completely filled the inner pores of $TiO_2$ inverse opal film (prepared by liquid phase deposition with an average thickness of 400 nm) and covered the entire area; exhibiting high crystalline properties of anatase and cubic phase from $TiO_2$ and $Cu_2O$, respectively. From asymmetric current-voltage profile, it was noticeable that a heterojunction was well formed for charge transport from $Cu_2O$ to $TiO_2$ film resulting from the enhanced charge separation yield. In addition, increased photocurrent of 0.19 $mA/cm^2$ (versus 0.08 $mA/cm^2$ under dark condition) was obtained at -0.35 V from the heterojunction structure in the 0.5M $Na_2SO_4$ solution.

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References

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