Rapid Communication in Photoscience

Korean Society of Photoscience (한국광과학회)
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NiFeOx co-catalyzed BiVO4 photoanode for improved photoelectrochemical water splitting

  • Kim, Jin Hyun (Pohang University of Science and Technology (POSTECH)) ;
  • Kang, Hyun Joon (Pohang University of Science and Technology (POSTECH)) ;
  • Magesh, Ganesan (Ulsan National Institute of Science and Technology (UNIST)) ;
  • Lee, Jae Sung (Ulsan National Institute of Science and Technology (UNIST))
  • Received : 2014.06.01
  • Accepted : 2014.06.10
  • Published : 2014.06.01
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Abstract

PEC (photoelectrochemical) water splitting for $O_2/H_2$ production is one of the promising but difficult way to utilize solar energy. Among photocatalytic materials for PEC water oxidation, $BiVO_4$ (Eg = 2.4 eV) has been recently intensively studied since it has various advantageous properties. But its maximum efficiency has not been realized owing to kinetic factors - slow water oxidation at surface & insufficient stability. These problems can be simultaneously solved by application of oxygen evolution catalyst (OEC) such as $CoO_x$, Co-Pi, $IrO_x$ etc. Herein we report the first successful application of $NiFeO_x$ OEC on $BiVO_4$, showing good performance compared to other effective OEC applied on $BiVO_4$ under basic conditions. The enhanced activity of OEC loaded $BiVO_4$ has been supported by the surface charge separation efficiency and electrochemical impedance studies.

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References

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