|About this Abstract
||Materials Science & Technology 2012
||International Symposium on Defects, Transport and Related Phenomena
||Surface Protonics: Basicity and Proton Activity on Oxide Surface
||Shu Yamaguchi, Takashi Tsuchiya, Shogo Miyoshi
|On-Site Speaker (Planned)
Protonic activity on free oxide surface exposed to gas atmosphere is discussed in view of basicity. Protons are introduced by hydration due to instability of unfavorable surface, which is strongly dependent on the basicity defined as thermodynamic activity of oxide ion on the surface. A new index of the oxide basicity is proposed by the authors based on the electronic structure of simple and complex oxides estimated from various electron spectroscopy measurements. The presentation covers the solid acid/base reaction and its significance in proton activities such as proton conductivity and proton-mediated RedOx reactions, both of which becomes important in applications of nanoelectronics devices used under an intense electrical field. Further discussion on surface reactions with some gaseous species and proton will be presented in addition to the validity of E-pO diagrams similar to the Pourbaix diagram (E-pH diagram) for aqueous solutions to understand the proton activity.