Study of the catalyst poisoning and reactivation of Pt nanoparticles on the surface of WO3 nanowire in gasochromic coloration

• Published in: Sensors and actuators. B, Chemical Vol. 171-172; pp. 1117 - 1124
• Main Authors: Luo, Jian Yi, Gong, Li, Tan, Hui Dong, Deng, Shao Zhi, Xu, Ning Sheng, Zeng, Qing Guang, Wang, Yi
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.08.2012
• Subjects: absorption; air; annealing; Catalyst poisoning; Catalyst reactivation; catalysts; chemical reactions; color; desorption; Gasochromic coloration; nanoparticles; nanowires; Oxygen spillover; Pt-coated WO3 nanowires; X-ray photoelectron spectroscopy; Catalyst poisoning; Catalyst reactivation; Oxygen spillover; Pt-coated WO3 nanowires; Gasochromic coloration
• ISSN: 0925-4005; 1873-3077
• DOI: 10.1016/j.snb.2012.06.042

In this paper, we report the degradation of gasochromic coloration performance in Pt-coated WO3 (Pt/WO3) nanowire films when the samples were exposed in air, due to the poisoning of Pt nanoparticles catalyst. The poisoned Pt nanoparticles can be reactivated by annealing in air, suggesting that the degradation originated from the absorption of certain gas species. X-ray photoelectron spectroscopy (XPS) was applied to investigate the gas desorption from poisoned Pt/WO3 nanowire films during the annealing process. Based on the XPS results, a model involving chemical reactions and physical processes on the surface of Pt/WO3 nanowires during annealing was developed to explain the degradation phenomenon.