Defect Chemistry of a Zinc-Doped Lepidocrocite Titanate CsxTi2−x/2Znx/2O4 (x = 0.7) and its Protonic Form

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• 作者：Tao Gao ; Helmer Fjellvg ; Poul Norby
• 刊名：Chemistry of Materials
• 出版年：2009
• 出版时间：August 11, 2009
• 年：2009
• 卷：21
• 期：15
• 页码：3503-3513
• 全文大小：1054K
• 年卷期：v.21,no.15(August 11, 2009)
• ISSN：1520-5002

文摘

A zinc-doped layered titanate Cs_xTi_2−x/2Zn_x/2O₄ (x = 0.7) with lepidocrocite (γ-FeOOH)-type layered structure was prepared via solid-state calcination. A complete extraction of both lattice Zn atoms and interlayer Cs ions was observed upon acid exchange, producing a protonic form H_2xTi_2−x/2x/2O₄·H₂O that inherited the original lepidocrocite-type layered structure. This new phase was distinguished from its isomorphous related compounds in terms of high proton content, high charge density, and high defect content as a consequence of extractable Zn atoms located in the host framework. The protonic titanate H_2xTi_2−x/2x/2O₄·H₂O readily underwent delamination to produce its molecular single sheets Ti_1−δδO₂^4δ− (δ = 0.175) with distinctive two-dimensional morphology and small thickness (1 nm), suggesting promising applications in the assembly of functional nanostructures.