A/R ratio | Annealing temperature | |||||
150˚C | 300˚C | 400˚C | 500˚C | 600˚C | 700˚C | |
TiO2 | 1:0 | 1:0 | 1:0 | 1:0.06 | 1:0.72 | 1:9.93 |
TiO2-NiO composite | 1:0 | 1:0.20 | 1:0.20 | 1:0.21 | 1:0.41 | 1:1.70 |