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Investigation on the CdS-incorporated decorated TiO2 nanoporous arrays as a photoanode for cathodic protection of 304 SS in a 0.5 M NaCl solution |
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| รหัสดีโอไอ | |
| Creator | 1. Aleena Boonserm 2. Chaiyaput Kruehong 3. Apichart Artnaseaw 4. Panomkorn Kwakhong 5. Varinrumpai Seithtanabutara |
| Title | Investigation on the CdS-incorporated decorated TiO2 nanoporous arrays as a photoanode for cathodic protection of 304 SS in a 0.5 M NaCl solution |
| Publisher | Faculty of Engineering, Khon Kaen University |
| Publication Year | 2560 |
| Journal Title | Engineering and Applied Science Research |
| Journal Vol. | 44 |
| Journal No. | 2 |
| Page no. | 68-75 |
| Keyword | Anodization, Titanium dioxide, CdS, Nanoporous, Cathodic protection |
| ISSN | 2539-6161 |
| Abstract | A CdS-incorporated TiO2 nanoporous material was fabricated using an anodic oxidation method combined with a chemical bath deposition technique. The three steps of anodization were completed to grow the anodic TiO2 nanoporous arrays (TNPs) on a titanium sheet in an ethylene glycol electrolyte containing 0.38wt% NH4F with the addition of 1.79 wt% H2O under an applied potential of 40 V. The CdS-decorated TiO2 nanoporous arrays (CdS/TNPs) were prepared using five dipping cycles of CdS deposition on the TNPs sample, which was calcined at 600?C in air for 3 h at a heating rate of 5 ?C min-1. The structure and composition of the as-prepared TNPs and CdS/TNPs were characterized using field emission scanning electron microscopy, X-ray diffraction and energy dispersive X-ray spectroscopy. The photoelectrochemical performance of the TNPs and CdS/TNPs electrode in a 0.5 M NaCl solution was evaluated through the electrochemical measurements under illumination and dark conditions. Decoration of CdS onto the TiO2 nanoporous array gave a higher transient photocurrent indicating a higher separation efficiency of the photogenerated electron-hole pairs and facile transport of these electrons to the metal substrate. Compared to a bare TiO2 nanoporous array, the CdS/TNPs photoanode exhibited more effective photocathodic protection properties for 304 stainless steel (304SS) under visible light illumination, with a photopotential of -412 mV versus silver-silver chloride electrode (SSE). This indicates that CdS has an enhanced effect on the photogenerated cathodic protection of TiO2 nanoporous array for 304SS. |
