TY - JOUR
T1 - Structural features of p-type semiconducting NiO as a co-catalyst for photocatalytic water splitting
AU - Hu, Che Chia
AU - Teng, Hsisheng
PY - 2010/5/25
Y1 - 2010/5/25
N2 - 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.
AB - 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.
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U2 - 10.1016/j.jcat.2010.03.020
DO - 10.1016/j.jcat.2010.03.020
M3 - Article
AN - SCOPUS:77954219230
VL - 272
SP - 1
EP - 8
JO - Journal of Catalysis
JF - Journal of Catalysis
SN - 0021-9517
IS - 1
ER -