Structural features of p-type semiconducting NiO as a co-catalyst for photocatalytic water splitting

Che Chia Hu, Hsisheng Teng

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138 Citations (Scopus)


Perovskite-like NaTaO3 photocatalysts, synthesized by sol-gel and solid-state methods, were loaded with NiO co-catalyst to enhance water splitting activity under UV illumination. Activity increased significantly with NiO loading and reached a maximum at 3 and 0.7 wt%, respectively, for the sol-gel and solid-state synthesized NaTaO3. Beyond this point, photocatalytic activity decreased with further loading. Analysis using X-ray diffraction, high-resolution transmission electron microscopy, and diffuse reflectance spectroscopy shows that the interdiffusion of Na+ and Ni2+ cations created a solid-solution transition zone on the outer sphere of NaTaO3. For NiO contents less than 3 wt%, no NiO clusters appeared on the NaTaO3 surface, and the reduction/oxidation pretreatment did not enhance photocatalytic activity. The high activity resulting from a low NiO loading suggests that the interdiffusion of cations heavily doped the p-type NiO and n-type NaTaO3, reducing the depletion widths and facilitating charge transfers through the interface barrier.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalJournal of Catalysis
Issue number1
Publication statusPublished - 2010 May 25

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Physical and Theoretical Chemistry


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