Figure 6

The normalized C-V curve of the CeO2 sample (a) without NH3 plasma treatment and (b) with NH3 plasma treatment for 3 min. The normalized C-V curve of the Ce2Ti2O7 sample (c) without and (d) with NH3 plasma treatment for 3 min.
The normalized C-V curve of the CeO2 sample (a) without NH3 plasma treatment and (b) with NH3 plasma treatment for 3 min. The normalized C-V curve of the Ce2Ti2O7 sample (c) without and (d) with NH3 plasma treatment for 3 min.