Alkaline‐Earth Metal Ca and N Codoped TiO2 with Exposed {001} Facets for Enhancing Visible Light Photocatalytic Activity. Issue 8 (30th April 2014)

• Record Type: Journal Article
• Authors: Zhang, Jun; Qian, Lisha; Fu, Wei; Xi, Junhua; Ji, Zhenguo; Hintzen, B.
• Is Part Of: Journal of the American Ceramic Society. Volume 97:Issue 8(2014)
• Page Start: 2615
• Page End: 2622
• Publication Date: 2014-04-30
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.12957
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" id="jace12957-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Alkaline‐earth metal Ca and N codoped TiO₂ sheets with exposed {001} facets were obtained through a one‐step hydrothermal process. The codoped TiO₂ appears as microsheets with length of 1–2 μm and thickness of 100–200 nm. The X‐ray diffractometer and X‐ray photoelectron spectroscopy results confirm that Ca and N codoped TiO₂ has higher crystallinity than N‐doped TiO₂, as well Ca, N atoms were successfully codoped into TiO₂ as interstitial Ca and interstitial N or an O–Ti–N structure, respectively. Compared with N monodoped, further alkaline‐earth Ca codoped has little influence on the energy bands of TiO₂ except slightly elevating the conduction band edge at a value of 0.02 eV. The hydroxyl radicals (OH) producing and photocatalytic experiment shows that Ca and N codoped can effectively decrease the generation of recombination centers, and enhance separation efficiency of photo‐induced electrons and holes as well as the photocatalytic activity of TiO₂. The codoped photocatalyst has the highest photocatalytic activity when Ca doped ratio reach 0.48%. Excess Ca doped will weaken the crystallization of anatase TiO₂, form charge center, produce new recombination centers and finally reduce the photocatalytic activity of TiO₂.</p> </abstract>