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(a) The Nyquist plot of the impedance spectrum of F-TiO2-NT at 80 °C and 20 °C with 100% relative humidity. (b) Arrhenius plot for the conductivity of (A) F-TiO2-NT and (B) TiO2-NT at 100% relative humidity. Reprinted with permission from Ref. [118]. Copyright 2011 Elsevier.
