Figure 2 (IMAGE) Tohoku University Caption Schematic images of the mechanism of fast proton diffusion by Nb doping into TiO2. Credit ©Tomoyuki Yamasaki et al. Usage Restrictions Credit must be given to the creator. License CC BY Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.