Preparation of FeS2/TiO2 nanocomposite films and study on the performance of photoelectrochemistry cathodic protection

Abstract

FeS2/TiO2 nanotube array composite films with clean, high efficiency, low cost and low consumption were prepared by electrochemical anodization and hydrothermal methods. The modification of FeS2 nanoparticles on the surface of TiO2 nanotube array film not only broadens the light absorption range of TiO2, but also improves the utilization ratio of visible light and the separation rate of photogenerated electron–hole pairs, which greatly improves the photoelectrochemical cathodic protection performance of TiO2 for 304 stainless steel (304SS). Under visible light irradiation, the open circuit potential of 304SS coupled with the FeS2/TiO2 nanocomposite films decreased from − 170 to − 700 mV, and the electrode potential can still maintained at − 400 mV after the light was turned off. Compared with pure TiO2 nanotube array film, FeS2/TiO2 nanocomposite film has better photoelectrochemical cathodic protection effect on 304SS in 3.5 wt% NaCl corrosion medium.

Ion‐Exchange Synthesis of ZnO/ZnSe/CdSe Core/Shell Heterostructured Nanowire Photoanodes toward High‐Performance Photocathodic Protection of 304 Stainless Steel

“…Construction of heterostructured semiconductor systems with well-matched band energies offers new opportunities to enhance spatial charge separations and ultimately boost photoelectrochemical properties. [8] Recently, various narrow bandgap semiconductors capable of absorbing visible light of solar spectrum have been composited with TiO 2 and ZnO to form heterojunctions for improving PCP performances, such as In 2 S 3 , [4] CdS, [9] Bi 2 S 3, [10] Sb 2 S 3 , [11] ZnIn 2 S 4 , [12] AgInSe 2 , [13] BiVO 4 , [14] TpBD-COF, [15] MoS 2 , [16] FeS 2 , [17] etc. In the meanwhile, geometric advantages of nanowire arrays over planar films have been demonstrated in the photoelectrochemical fields.…”

Capturing Solar Energy for Cathodic Protection of Metals: The Life of Photoexcited Charge Carriers

“…Hence, with a built-in interfacial electric field owing to the energy band alignment, the recombination of photogenerated carriers is greatly suppressed. As shown in Table 3, heterojunctions of metal oxides (TiO 2 , [36][37][38]44,45,[79][80][81][82][83][84][85][86][87][88] ZnO [89][90][91] (3.37 eV), WO 3 [79,81,89] (2.8 eV), SnO 2 [37,92] (3.6 eV), BiVO 4 [35,36,79] (2.4 eV), etc.) with relatively large bandgaps and transition metal chalcogenides (Bi 2 S 3 , [72,81] In 2 Se 3 [85] (1.5 eV), FeS 2 [87] (0.95 eV), ZnS [69,73,81] (3.6 eV), etc.)…”

“…As shown in Table 3, heterojunctions of metal oxides (TiO 2 , [36][37][38]44,45,[79][80][81][82][83][84][85][86][87][88] ZnO [89][90][91] (3.37 eV), WO 3 [79,81,89] (2.8 eV), SnO 2 [37,92] (3.6 eV), BiVO 4 [35,36,79] (2.4 eV), etc.) with relatively large bandgaps and transition metal chalcogenides (Bi 2 S 3 , [72,81] In 2 Se 3 [85] (1.5 eV), FeS 2 [87] (0.95 eV), ZnS [69,73,81] (3.6 eV), etc.) with narrow bandgaps were frequently employed in PECCP systems.…”

“…Protection of 304 SS/ ΔE ss ¼ À530 mV (under illumination) ΔE ss ¼ À230 mV (post-illumination) [87] 2022…”

NiO-FeS2 Heterostructure Composite: Benign Photocatalyst for Reduction of Nitrophenol to Aminophenol

“…Semiconductor nanoparticles are applied to other materials to strengthen their physical properties which lead to extra catalytic performance. In that sense, iron sulfide (FeS2) is a promising material for composites making, also has great visible light response as its lower bandgap 0.95 to 1.03 eV with high light absorption coefficient (6 x 10 -5 cm -1 ) and is naturally occurred, stable physicochemical properties, non-toxic, and cost-effective [10][11]. Several catalysts such as Au, Cu, Ag, CuO@C dots, bimetallic AuxAg1-x, Cu nanowires, Ag@GO were reported for the reduction of 4-NP to 4-AP [11][12][13].…”