Fig. 5From: Regulating the surface of anion-doped TiO2 nanorods by hydrogen annealing for superior photoelectrochemical water oxidationElemental analysis by XPS spectra. a O 1 s, bb S 2p and N 1 s peaks for the S, N-doped TiO2 nanorod arrays under various H2 treatment conditions. c Change of peak volume ratio (S–O and Ov/Ti–O) for H2 annealing temperature. d Sulfur and e nitrogen dopant concentration change for H2 annealing temperature, obtained by XPS analysisBack to article page