An Important Factor Affecting the Supercapacitive Properties of Hydrogenated TiO2 Nanotube Arrays: Crystal Structure

Table 3 Relative concentrations of Ti³⁺ of each sample

Samples	H@TNAs-2	H@TNAs-3	H@TNAs-4
Relative concentration of Ti³⁺ (%)	30.9	21.29	11.8