Preparation of MoO₃/TiO₂Composite Films and Their Application in Photoelectrochemical Anticorrosion

Abstract

TiO2 nanotube array films were prepared on Ti substrates by a potentiostatic anodization method. Then, MoO3 nanoparticles were deposited on the TiO2 films by a pulse current deposition technique. The properties of the prepared films were characterized by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, UV-Vis spectrophotometry, photoluminescence and photoelectrochemical measurements. Besides, the photogenerated cathodic protection performances of the composite films were investigated by recording the potential change of 403 stainless steel coupled to the films under white light illumination. The result showed that the absorption edge of the MoO3/TiO2 composite film was red-shifted compared with the pure TiO2 nanotube film, and the photochemical performance of the composite film was impoved. After 403 stainless steel in a corrosive solution with 0.5 M NaCl was coupled to the MoO3/TiO2 composite film under white light illumination, its potential decreased by 540 mV, showing an improved photogenerated cathodic protection effect on the steel.

Photochargeable Semiconductors: in “Dark Photocatalysis” and Beyond

“…Electrochemical studies confirmed that photogenerated electrons are swiftly transferred from TiO 2 to WO 3 and subsequently reside in the latter with slow discharge to steel in the dark. [ 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 ]…”

“…Electrochemical studies confirmed that photogenerated electrons are swiftly transferred from TiO 2 to WO 3 and subsequently reside in the latter with slow discharge to steel in the dark. [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 .…”

Preparation of SnIn4S8/TiO2 Nanotube Photoanode and Its Photocathodic Protection for Q235 Carbon Steel Under Visible Light

“…More specifically, constructing heterojunctions by combining with other materials has proven to be a valid method for improving the photoelectrochemical properties of TiO 2 . The materials used for this strategy include metal oxides (In 2 O 3 [22], MoO 3 [23], Bi 2 O 3 [24], WO 3 [25,26], RuO 2 [27,28]), metal sulfides and selenides (Ag 2 S [29], Bi 2 S 3 [30], Ag 2 Se [31]), graphene [32][33][34], Co(OH) 2 [35], and ZnFeAl-layered double hydroxides [36].…”

Preparation of recyclable MoO3 nanosheets for visible-light driven photocatalytic reduction of Cr(vi)

“…[16][17][18][19][20] By now, many synthesis processes of MoO 3 are widely investigated using electrodeposition, molten salt, hydrothermal, sol-gel methods et al, and different morphologies including nanobers, microbelts and ower-like spheres can be fabricated. [21][22][23][24][25][26] Nowadays MoO 3 has been widely used as photocatalysts. As reported in ref.…”