Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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ZnO Nanorod Array as an Efficient Photoanode for Photoelectrochemical Water Oxidation

광전기화학적 물 산화용 산화아연 나노막대 광양극의 합성 및 특성평가

  • Park, Jong-Hyun (Department of Materials Science and Engineering, Chungnam National University) ;
  • Kim, Hyojin (Department of Materials Science and Engineering, Chungnam National University)
  • 박종현 (충남대학교 공과대학 신소재공학과) ;
  • 김효진 (충남대학교 공과대학 신소재공학과)
  • Received : 2020.01.13
  • Accepted : 2020.04.09
  • Published : 2020.05.27
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Abstract

Synthesizing one-dimensional nanostructures of oxide semiconductors is a promising approach to fabricate highefficiency photoelectrodes for hydrogen production from photoelectrochemical (PEC) water splitting. In this work, vertically aligned zinc oxide (ZnO) nanorod arrays are successfully synthesized on fluorine-doped-tin-oxide (FTO) coated glass substrate via seed-mediated hydrothermal synthesis method with the use of a ZnO nanoparticle seed layer, which is formed by thermally oxidizing a sputtered Zn metal thin film. The structural, optical and PEC properties of the ZnO nanorod arrays synthesized at varying levels of Zn sputtering power are examined to reveal that the optimum ZnO nanorod array can be obtained at a sputtering power of 20 W. The photocurrent density and the optimal photocurrent conversion efficiency obtained for the optimum ZnO nanorod array photoanode are 0.13 mA/㎠ and 0.49 %, respectively, at a potential of 0.85 V vs. RHE. These results provide a promising avenue to fabricating earth-abundant ZnO-based photoanodes for PEC water oxidation using facile hydrothermal synthesis.

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References

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