TY - JOUR
T1 - Proton conduction properties of hydrous sulfated nano-titania synthesized by hydrolysis of titanyl sulfate
AU - Sakai, Takaaki
AU - Kajitani, Satoshi
AU - Kim, Seok Jun
AU - Hamagami, Jun Ichi
AU - Oda, Hiroyuki
AU - Matsuka, Maki
AU - Matsumoto, Hiroshige
AU - Ishihara, Tatsumi
N1 - Funding Information:
This study was supported by the Industrial Technology Research Grant Program in 08C46583c from the New Energy and Industrial Technology Development Organization (NEDO).
PY - 2010/12/20
Y1 - 2010/12/20
N2 - We investigated the electrical conductivity and electrochemical properties of hydrous sulfated nano-titania. The conductivity reached 0.1 S cm - 1 at 50 °C under a relative humidity of 80%. Diffuse reflectance FT-IR spectra suggest that bidentate sulfate coordination likely forms on the nano-titania surface, which in turn contributes to the electrical conduction. The conductivity depended on relative humidity. Using a hydrogen concentration cell, we found that the electromotive force (EMF) of the nano-titania was almost the same as the theoretical value. These results suggest that the main conduction mechanism is proton conduction on the surface of the titania nanoparticles with the aid of sulfonic acid groups bound to the surface of the oxide.
AB - We investigated the electrical conductivity and electrochemical properties of hydrous sulfated nano-titania. The conductivity reached 0.1 S cm - 1 at 50 °C under a relative humidity of 80%. Diffuse reflectance FT-IR spectra suggest that bidentate sulfate coordination likely forms on the nano-titania surface, which in turn contributes to the electrical conduction. The conductivity depended on relative humidity. Using a hydrogen concentration cell, we found that the electromotive force (EMF) of the nano-titania was almost the same as the theoretical value. These results suggest that the main conduction mechanism is proton conduction on the surface of the titania nanoparticles with the aid of sulfonic acid groups bound to the surface of the oxide.
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U2 - 10.1016/j.ssi.2010.09.053
DO - 10.1016/j.ssi.2010.09.053
M3 - Article
AN - SCOPUS:78649738319
SN - 0167-2738
VL - 181
SP - 1746
EP - 1749
JO - Solid State Ionics
JF - Solid State Ionics
IS - 39-40
ER -