Optimization and an insightful properties-Activity study of electrospun TiO2/CuO composite nanofibers for efficient photocatalytic H2 generation
Optimization and an insightful properties-Activity study of electrospun TiO2/CuO composite nanofibers for efficient photocatalytic H2 generation
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DOI：
10.1016/j.apcatb.2013.03.033
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发表时间：
2013-08-01
影响因子：
22.1
通讯作者：
Sun, Darren Delai
中科院分区：
文献类型：
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作者：
Lee, Siew Siang;Bai, Hongwei;Sun, Darren Delai
对电纺TiO 2/CuO复合纳米纤维的优化结果表明，掺杂量为6 mol.%的TiO 2/CuO复合纳米纤维在450 ℃下煅烧45 min的Cu从10%（v/v）甲醇水溶液中表现出最高的H-2生成。通过改变合成煅烧温度，进一步揭示了电纺TiO 2/CuO复合纳米纤维的形貌、孔隙率、比表面积、结晶度、晶粒尺寸以及元素状态等基本物理化学性质之间的平衡和协同作用对光催化产氢的重要性。在高于和低于450 ℃的温度下煅烧对H-2的产生都有负面影响。这归因于温度对晶相转变、晶体生长、介孔形成和Cu价态的影响，从而不利地影响了TiO 2/CuO复合纳米纤维的光催化活性的物理化学性质之间的协同作用。良好的稳定性与可忽略的铜浸出和可重复使用性也达到了与复合纳米纤维。该研究为设计和制备高效稳定的TiO 2/CuO复合纳米纤维提供了一个重要的发展平台，从而促进了其作为清洁能源生产的经济型光催化剂的应用潜力。(C)2013 Elsevier B. V.保留所有权利。
Optimization of electrospun TiO2/CuO composite nanofibers shows that TiO2/CuO composite nanofibers with 6 mol.% Cu, calcined at 450 degrees C for 45 min, exhibited the highest H-2 generation from 10% (v/v) methanol aqueous solution. The significance of balance and synergy among the essential physicochemical properties such as morphology, porosity, specific surface area, degree of crystallinity, crystal size, as well as elemental states on the photocatalytic H-2 generation of electrospun TiO2/CuO composite nanofibers was further revealed by means of varying the synthesis calcinations temperatures. Calcinations at temperature above and below 450 degrees C showed negative effect on the H-2 generation. This was ascribed to the temperature effect on transformation of crystalline phase, crystal growth, mesoporosity formation, and Cu valence state which has thus adversely affected the synergy among the physicochemical properties governing the photocatalytic activity of TiO2/CuO composite nanofibers. Good stability with negligible Cu leaching and reusability were also attained with the composite nanofibers. This study serves as a significant advancement platform to designing and fabricating high efficient and stable TiO2/CuO composite nanofibers via facile electrospinning thus promoting its application potential as an economical photocatalyst for production of clean energy. (C) 2013 Elsevier B.V. All rights reserved.