Laser processing of TiO₂ colloids for an enhanced photocatalytic water splitting activity

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• 作者：Simona Filice^a ; ^d ; Giuseppe Compagnini^a ; ^{gcompagnini@unict.it} ; Roberto Fiorenza^a ; Salvatore Scirè ; ^a ; Luisa D&rsquo ; Urso^a ; Maria Elena Fragalà ; ^a ; Paola Russo^a ; ^c ; Enza Fazio^b ; Silvia Scalese^d
• 关键词：Colloidal laser processing ; Catalysis ; Hydrogen production
• 刊名：Journal of Colloid and Interface Science
• 出版年：2017
• 出版时间：1 March 2017
• 年：2017
• 卷：489
• 期：Complete
• 页码：131-137
• 全文大小：1488 K
• 卷排序：489

文摘

We have measured the photocatalytic water splitting activity of several titania colloids, modified by nanosecond pulsed laser irradiation. Photocatalysis has been tested using UV and visible light. We have found that laser irradiation increases the hydrogen production efficiency up to a factor of three for anatase, rutile and P25. A hydrogen production rate as high as 30 mmol g−1 h−1 has been obtained with good stability, tested by repeated runs. The chemical and morphological properties of the nanoparticles have been studied by electron microscopy, X-ray photoelectron spectroscopy and Raman spectroscopy, showing that laser irradiation promotes the formation of disordered surface state and lattice distortion which could be responsible for the observed enhanced photocatalytic activity.