Fabrication and Photocathodic Protection Performance of Bi2S3/TiO2 Nanocomposites for 304 Stainless Steel
TiO2 nanotube arrays are decorated with Bi2S3 by a successive ionic layer adsorption and reaction(SILAR)method,aiming to enhance the photoelectric conversion ability of TiO2 and photogene-rated cathodic protection performance of TiO2 nanotube arrays for 304 stainless steel.B-(x)/TiO2 nano-tubes(x=1,3,5,7)were prepared by changing the number of deposition cycles of Bi2S3.The morphology,structure,light response ability and photogenerated carrier separation efficiency of Bi2S3/TiO2 nanocom-posites were examined by means of XRD,SEM and XPS.At the same time,the photoelectrochemical properties of Bi2S3/TiO2 nanocomposites were tested under simulated sunlight.In addition,the effect of the number of deposition cycles of Bi2S3 on the photocathodic protection performance of TiO2 nanocom-posites was also studied.After Bi2S3 modification,the band gap of the composites decreases,and the re-combination rate of photogenerated carriers decreases greatly.When a 5 cyclic deposition of Bi2S3 is ad-opted,the photoelectrochemical properties of the prepared nanocomposites are the best.Of which the band gap is reduced to 2.9 eV,and the photocurrent density is increased from 200 μA·cm-2 to 550 μA·cm-2 under the condition of turning on light,which is 2.75 times that of the bare TiO2 nanotube arrays.Af-ter coupling the modified nanocomposite with 304 stainless steel,the coupling potential can be reduced to-1.0 V under simulated sunlight,which is about 80 mV lower than the coupling potential before modifi-cation,which can further improve the photogenerated cathodic protection effect on 304 stainless steel.
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