物理化学学报2021，Vol.37Issue(3)：66-72,7.DOI:10.3866/PKU.WHXB201906033
NiOITi02异质结构纳米管阵列膜对不锈钢的光生阴极保护及其储能
Photocathodic Protection on Stainless Steel by Heterostructured NiO/Ti02 Nanotube Array Film with Charge Storage Capability
摘要
Abstract
Photocathodic protection by Ti02 semiconductor materials for metals has interested many corrosion researchers for years.However,a pure Ti02 semiconductor anode can only absorb ultraviolet light and cannot maintain the photocathodic protection in the dark.This has limited its practical applications to a great extent.Overcoming these limitations is significant as well as challenging.Therefore,the objective of this work is to prepare a modified Ti02 composite film with visible light absorption and charge storage capabilities for application in photocathodic protection.First,we fabricated an ordered Ti02 nanotube array film on a Ti substrate by electrochemical anodization.Then,we prepared NiO nanoparticles on the film via a hydrothermal reaction to obtain a p-n heterostructured NiO/TiC2 nanotube array composite film.The properties of the prepared films were investigated by scanning electron microscopy,X-ray diffraction,X-ray photoelectron spectroscopy,UV-Vis absorption spectroscopy,photoluminescence spectroscopy,and photoelectrochemical techniques.The results indicated that the electrochemically anodized Ti02 film had an anatase phase structure and consisted of vertically ordered nanotubes with an inner diameter of about 80 nm and length of 250 nm.After the NiO nanoparticles were deposited on the film,the Ti02 nanotube array structure remained intact.The main phase of Ti02 was still anatase,but the light absorption of the NiO/Ti02 composite film was extended into the visible region,which was in contrast to that of the simple Ti02 film.Moreover,the composite film showed lower photoluminescence intensities than the Ti02 film,implying that a higher charge carrier separation efficiency could be achieved by modification with NiO.Under white light illumination,the photocurrent density of the NiO/Ti02 composite film in a mixed solution of 0.5 mol·L'1 KOH and 1 mol-L-1 CH3OH reached 176 pA.cm-2,which was 2 times higher than that of the simple TiO2 nanotube film,indicating that the composite film had improved photoelectric conversion efficiency and photoelectrochemical properties.The potential of 403 stainless steel(403SS)in 0.5 mol-L-1 NaCI solution decreased by 380 and 440 mV relative to its corrosion potential when coupled to the Ti02 film and NiO/TiC2 composite film,respectively,under white light illumination.This indicated that the heterostructured NiO/Ti02 film as a photoanode could produce more effective photocathodic protection on the steel as compared with the pure Ti02 film.Even after 2.5 h of illumination,the composite film could continuously provide photocathodic protection to 403SS for about 15.5 h in the dark,suggesting that the NiO/TiC2 composite film had a charge storage capability that was significant for its practical applications.关键词
阳极氧化/水热处理/TiO2纳米管/NiO/光电化学/光生阴极保护/不锈钢Key words
Anodic oxidation/Hydrothermal treatment/Ti02 nanotube/NiO/Photoelectrochemistry/Photocathodic protection/Stainless steel分类
化学化工引用本文复制引用
金飘,官自超,梁燕,谭凯,王霞,宋光铃,杜荣归..NiOITi02异质结构纳米管阵列膜对不锈钢的光生阴极保护及其储能[J].物理化学学报,2021,37(3):66-72,7.基金项目
The project was supported by the National Natural Science Foundation of China(21573182,51731008,51671163,21621091).国家自然科学基金(21573182,51731008,51671163,21621091)资助项目 （21573182,51731008,51671163,21621091）
