Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Synthesis of Magneli Phases and Application to the Photoelectrochemical Electrode

마그넬리상 합성과 광전기화학셀 전극 응용

  • Park, Jihwan (Department of Materials Science and Engineering, Chungnam National University) ;
  • Nguyen, Duc Quang (Department of Materials Science and Engineering, Chungnam National University) ;
  • Yang, Haneul (Department of Materials Science and Engineering, Chungnam National University) ;
  • Hong, Soonhyun (Department of Materials Science and Engineering, Chungnam National University) ;
  • Truong, Thi Hien (Department of Materials Science and Engineering, Chungnam National University) ;
  • Kim, Chunjoong (Department of Materials Science and Engineering, Chungnam National University) ;
  • Kim, Dojin (Department of Materials Science and Engineering, Chungnam National University)
  • 박지환 (충남대학교 공과대학 신소재공학과) ;
  • ;
  • 양하늘 (충남대학교 공과대학 신소재공학과) ;
  • 홍순현 (충남대학교 공과대학 신소재공학과) ;
  • ;
  • 김천중 (충남대학교 공과대학 신소재공학과) ;
  • 김도진 (충남대학교 공과대학 신소재공학과)
  • Received : 2018.03.27
  • Accepted : 2018.04.08
  • Published : 2018.05.27
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Abstract

Hydrothermal synthesis of highly crystalline $TiO_2$ nanorods is a well-developed technique and the nanorods have been widely used as the template for growth of various core-shell nanorod structures. Magneli/CdS core-shell nanorod structures are fabricated for the photoelectrochemical cell (PEC) electrode to achieve enhanced carrier transport along the metallic magneli phase nanorod template. However, the long and thin $TiO_2$ nanorods may form a high resistance path to the electrons transferred from the CdS layer. $TiO_2$ nanorods synthesized are reduced to magneli phases, $TixO_{2x-1}$, by heat treatment in a hydrogen environment. Two types of magneli phase nanorods of $Ti_4O_7$ and $Ti_3O_5$ are synthesized. Structural morphology and X-ray diffraction analyses are carried out. CdS nano-films are deposited on the magneli nanorods for the main light absorption layer to form a photoanode, and the PEC performance is measured under simulated sunlight irradiation and compared with the conventional $TiO_2/CdS$ core-shell nanorod electrode. A higher photocurrent is observed from the stand-alone $Ti_3O_5/CdS$ core-shell nanorod structure in which the nanorods are grown on both sides of the seed layer.

Keywords

References

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