Fabrication of CdTe/ZnS core/shell quantum dots sensitized TiO2 nanotube films for photocathodic protection of stainless steel

Research progress of TiO2 photocathodic protection to metals in marine environment

“…To improve the stability of CdTe QDs, ZnS shells were deposited on CdTe/TiO 2 composite fi lms. The results showed that the ZnS/ CdTe/TiO 2 composite fi lm had excellent photoelectrochemical properties (Zhang et al, 2015a), and the mechanism is illustrated in Fig.6. Sb 2 S 3 is also used to modify TiO 2 because of its narrow bandgap.…”

“…ZnS has some properties similar to those of CdS, such as nontoxicity and chemically stable performance. It has been reported that a ZnS coating can protect CdS and CdTe from photocorrosion (Lin et al, 2010;Zhang et al, 2015a). Construction of Z-scheme photocatalytic systems consisting of two semiconductors as photoexcitation systems, with the constructor located at the interface to reduce the contact resistance, is increasing in popularity.…”

“…Yuan and Tsujikawa (1995) investigated the photoeff ect of TiO 2 coatings on copper substrates under ultraviolet illumination for the fi rst time. In the last three decades, a considerable amount of eff ort has been devoted to photocathodic protection for metals by using many types of semiconductors, such as TiO 2 , SrTiO 3 , g-C 3 N 4 , In 2 O 3 and ZnO (Yuan et al, 1994;Huang et al, 2000;Liu et al, 2007;Bu et al, 2011Bu et al, , 2013Li et al, 2014Li et al, , 2015bSun et al, 2014Zhang et al, 2015a;Yang and Cheng, 2018). Among these materials, TiO 2 is the most widely used material and serves as a photoanode due to its low cost, high stability, nontoxicity and easy availability.…”

Fabrication of tungsten-iron-doped TiO2 nanotubes via anodization: new photoelectrodes for photoelectrochemical cathodic protection under visible light

“…On the other hand, pure TiO 2 film due to its wide energy band gap (E g = 3.2 eV) cannot impressively absorb light in visible region. It is difficult to maintain photocathodic protection in the absence of light because of the fast recombination of the photogenerated electron-hole (e − -h + ) pairs, and it is essential to prepare TNTs for extending the light absorption ranges and improve the photoelectrochemical performances of TiO 2 [15].…”

Highly efficient polypyrrole sensitized TiO 2 nanotube films for photocathodic protection of Q235 carbon steel

“…Great efforts are also under way to tune the band gap response of TNAs to the visible region [4][5][6]. Coupling with noble metals [7][8][9], doping with narrow band semiconductor quantum dots [10][11][12][13][14], compositing with carbon materials (e.g. GO [15], rGO [16,17]) and polymer [18] and sensitizing with organic dyes [19][20][21] are considered feasible ways to modify TNAs.…”