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Table 2 Interfacial free energy calculation

From: Regulating the surface of anion-doped TiO2 nanorods by hydrogen annealing for superior photoelectrochemical water oxidation

Sample

Angle (degree)

γL (mN/m)

γS (mN/m)

γSL (mN/m)

Air

DI water

61.8

72.8

22.97

− 14.31

H2

DI water

38.57

72.8

25.83

− 21.30

Air

NaOH

30.23

59.36

16.95

− 5.44

H2

NaOH

18.10

59.36

22.79

− 20.66