Preparation of platinized strontium titanate covered with hollow silica and its activity for overall water splitting in a novel phase-boundary photocatalytic system
Preparation of platinized strontium titanate covered with hollow silica and its activity for overall water splitting in a novel phase-boundary photocatalytic system
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DOI：
10.1016/j.cattod.2006.05.037
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发表时间：
2006-09-30
期刊：
影响因子：
5.3
通讯作者：
Ohtani, Bunsho
中科院分区：
文献类型：
--
作者：
Ikeda, Shigeru;Hirao, Ko;Ohtani, Bunsho
通过在Pt-SrTiO 3上双层缠绕碳层和二氧化硅层，然后热处理除去碳层，制备了载铂钛酸锶（Pt-SrTiO 3）（核）-二氧化硅（壳）粉末。扫描电子显微镜（SEM）观察和BET表面积的分析表明，粉末在Pt-SrTiO 3（核）和二氧化硅（壳）之间具有空隙空间。当粉末的表面用氟烷基硅烷化剂部分改性时，由此获得的材料在气-水界面处组装并用作光催化剂，用于整体水分解以产生氢（H-2）和氧（O-2）。可能是由于在铂上抑制了由H-2和O-2生成水的逆反应，该系统的总效率高于常规悬浮系统的总效率。此外，虽然直接覆盖有氟烷基乙基甲硅烷基的Pt-SrTiO 3粉末显示出低的光稳定性，即，由于表面氟烷基乙基甲硅烷基基团的光催化分解，长时间的照射使一些表面改性的颗粒在水中沉淀，这种材料可以保持其在相边界处的位置。(C)2006 Elsevier B. V.保留所有权利。
Platinum-loaded strontium titanate (Pt-SrTiO3) (core) -silica (shell) powder was prepared by double-layer winding of a carbon and a silica layer on Pt-SrTiO3 followed by heat treatment to remove the carbon layer. Scanning electron microscope (SEM) observation and analyses of the BET surface area suggested that the powder has a void space between Pt-SrTiO3 (core) and silica (shell). When the surface of the powder was partially modified with a fluoroalkylsilylation agent, thus-obtained material assembled at a gas-water interface and acted as a photocatalyst for overall water splitting to produce hydrogen (H-2) and oxygen (O-2). Probably due to the suppression of a backward reaction, production of water from H-2 and O-2, on the platinum, the overall efficiency of this system was higher than that of the conventional suspension system. Moreover, while the Pt-SrTiO3 powders directly covered with fluoroalkylethylsilyl groups showed low photostability, i.e., prolonged irradiation precipitated some of the surface-modified particles in water owing to photocatalytic decomposition of surface fluoroalkylethylsilyl groups, this material could retain its location at the phase boundary. (C) 2006 Elsevier B.V. All rights reserved.