Energy storage ability and anti‐corrosion protection properties of TiO 2 –SnO 2 system

TiO 2 /SnO 2 and TiO 2 –SnO 2 coatings were prepared on type 304 stainless steel by sol–gel method, respectively. TiO 2 /SnO 2 coating is compared with TiO 2 –SnO 2 coating in terms of energy storage ability and anti‐corrosion property. The two coatings can be charged with reductive energy under UV irradiation in 3 wt% aqueous NaCl. The self‐discharging time of the TiO 2 /SnO 2 coating is slower than that of the TiO 2 –SnO 2 coating. The slow discharging may be suitable for an anti‐corrosion application for metal. In the case where TiO 2 /SnO 2 coating electrode is electrochemically charged at −0.38 V ( vs . SCE) for 1 h, it can maintain a good cathodic protection for type 304 stainless steel for 7 h in the dark, while the TiO 2 –SnO 2 coating electrode can only maintain a good cathode protection for 0.5 h in the dark.