Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Photoelectrochemical Water Splitting on a Delafossite CuGaO2 Semiconductor Electrode

  • Lee, Myeongsoon (Department of Chemistry, Pukyong National University) ;
  • Kim, Don (Department of Chemistry, Pukyong National University) ;
  • Yoon, Yong Tae (Department of Chemistry, Pukyong National University) ;
  • Kim, Yeong Il (Department of Chemistry, Pukyong National University)
  • Received : 2014.03.13
  • Accepted : 2014.07.21
  • Published : 2014.11.20
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Abstract

A pellet of polycrystalline $CuGaO_2$ with a delafossite structure was prepared from $Ga_2O_3$ and CuO by high-temperature solid-state synthesis. The $CuGaO_2$ pellet was a p-type semiconductor for which the electrical conductivity, carrier density, carrier mobility and Seebeck coefficient were $5.34{\times}10^{-2}{\Omega}^{-1}cm^{-1}$, $3.5{\times}10^{20}cm^{-3}$, $9.5{\times}10^{-4}cm^2V^{-1}s^{-1}$ at room temperature, and $+360{\mu}V/K$, respectively. It also exhibited two optical transitions at about 2.7 and 3.6 eV. The photoelectrochemical properties of the $CuGaO_2$ pellet electrode were investigated in aqueous electrolyte solutions. The flat-band potential of this electrode, determined using a Mott-Schottky plot, was +0.18 V vs SCE at pH 4.8 and followed the Nernst equation with respect to pH. Under UV light illumination, a cathodic photocurrent developed, and molecular hydrogen simultaneously evolved on the surface of the electrode due to the direct reduction of water without deposition of any metal catalyst.

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References

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