Fig. 3From: Regulating the surface of anion-doped TiO2 nanorods by hydrogen annealing for superior photoelectrochemical water oxidationThe photocurrent density comparison graph for the post annealing and H2 treatment temperature. The photocurrent densities were determined at the 1.23 V vs. RHE condition. The color of bar designates follows: > 2.5: red, > 2.0: orange, 1.5 > yellow, 1.0 > blue, 0.5 > purpleBack to article page