Photocathodic protection properties of TiO₂–V₂O₅ composite coatings

Abstract

TiO2/vanadium pentoxide (V2O5) and TiO2–V2O5 coatings were prepared on type 304 stainless steel substrates via a sol–gel method, respectively. The TiO2/V2O5 coating is compared with the TiO2–V2O5 coating in terms of the photo‐electrochemical performance. The two coatings can be stored with photogenerated electrons under UV irradiation in 3 wt% aqueous NaCl. The self‐discharging time of the TiO2/V2O5 coating is slower than that of the TiO2–V2O5 coating. The slow discharging may be suitable for an anti‐corrosion application for stainless steel. In the case while the two coatings are electrochemically charged under UV irradiation for 1 h, the TiO2/V2O5 coating can maintain a good cathodic protection for type 304 stainless steel for 6 h in the dark, while the TiO2–V2O5 coating can only maintain a good cathode protection for 0.5 h in the dark.

Photochargeable Semiconductors: in “Dark Photocatalysis” and Beyond

“…[93] Numerous reports of energy-storing TiO 2 /WO 3 heterojunction for anti-corrosion have been reported, [95][96][97][98][99][100][101] as well as equivalent structures with bronze formation reaction based on MoO 3 , [102] SnO 2 , [103][104][105][106] and V 2 O 5 . [107] Further approaches on the electron pools involved Mn─Ti, [108] In─Ti, [109][110][111] Ni─Ti, [112,113] Bi─Ti, [114][115][116] Ce─Ti, [117] Mn─Ti, [108] Ag─Ti, [118] SrTiO 3 ─TiO 2 . [119] One of the best-performing photoanode for cathodic protection consisted of a Fe-doped TiO 2 array of nanotubes, reported by Li et al [120] The doping extended the absorption from the UV to the full visible region and led to outstanding stored charge longevity.…”

“…[ 93 ] Numerous reports of energy‐storing TiO 2 /WO 3 heterojunction for anti‐corrosion have been reported, [ 95–101 ] as well as equivalent structures with bronze formation reaction based on MoO 3 , [ 102 ] SnO 2 , [ 103–106 ] and V 2 O 5 . [ 107 ]…”

Research progress of TiO2 photocathodic protection to metals in marine environment

“…Therefore, nontoxic Fe has good performance in photocathode protection (Deng et al, 2015). V 2 O 5 can store electrons and cations, and TiO 2 /V 2 O 5 composite materials can serve as photoelectrodes for light energy conversion and storage (Zhou et al, 2012). The indirect bandgap energy of In 2 O 3 is 2.8 eV, so In 2 O 3 is an eff ective semiconductor material with a visible light response.…”

Fabrication and performance of the Pt-Ru/Ni-P/FTO counter electrode for dye-sensitized solar cells

“…According to some references [25,26], the electroless plating solution of Ni-P alloy contained 30 g L −1 NiSO 4 , 30 g L −1 NaH 2 PO 2 ,20 g L −1 NaAc, 0.2 mg CH 4 N 2 S and 1 g NH 4 Cl in 100 ml deionized water. The deposition reaction was triggered by an aluminum sheet touching with the FTO substrate at the temperature of 70 • C. The pH value was adjusted to 5∼6 with 0.1 M sulphuric acid solution and 0.1 M ammonia.…”