Centre for Photoelectrochemistry and School of Chemistry, Madurai Kamaraj University, Madurai -625 021, India.
ACS Appl Mater Interfaces. 2010 Jul;2(7):1912-7. doi: 10.1021/am100242p.
The N-[3-(trimethoxysilyl)propyl]ethylenediamine (EDAS) derived silicate matrix supported core-shell TiO(2)-Au nanoparticles (EDAS/(TiO(2)-Au)(nps)) were prepared by NaBH(4) reduction of HAuCl(4) precursor on preformed TiO(2) nanoparticles in the presence of EDAS monomer. The core-shell (TiO(2)-Au)(nps) nanoparticles were stabilized by the amine functional group of the EDAS silicate sol-gel network. The potential application of this EDAS/(TiO(2)-Au)(nps) modified electrode toward the photoelectrochemical oxidation of methanol was explored. The EDAS/(TiO(2)-Au)(nps) modified electrode showed a 12-fold enhancement in the catalytic activity toward photoelectrooxidation of methanol when compared to TiO(2) dispersed in EDAS silicate sol-gel matrix. This improved photoelectrochemical performance is explained on the basis of beneficial promotion of interfacial charge transfer processes of the EDAS/(TiO(2)-Au)(nps) nanocomposite. A methanol oxidation peak current density of 12.3 mA cm(-2) was achieved at an optimum loading of Au(nps) on TiO(2) particles. This novel amine functionalized EDAS silicate sol-gel stabilized core-shell (TiO(2)-Au)(nps) nanomaterial could be an excellent candidate for the photocatalytic and photoelectrochemical applications.
N-[3-(三甲氧基硅基)丙基]乙二胺（EDAS）衍生的硅酸盐基质负载核壳 TiO(2)-Au 纳米粒子（EDAS/(TiO(2)-Au)(nps)）是通过在 EDAS 单体存在下，用 NaBH(4)还原 HAuCl(4)前体制备的。核壳（TiO(2)-Au)(nps)纳米粒子被 EDAS 硅酸盐溶胶-凝胶网络的胺官能团稳定。探索了这种 EDAS/(TiO(2)-Au)(nps)修饰电极在光电化学氧化甲醇方面的潜在应用。与分散在 EDAS 硅酸盐溶胶-凝胶基质中的 TiO(2)相比，EDAS/(TiO(2)-Au)(nps)修饰电极对甲醇光电氧化的催化活性提高了 12 倍。这种改进的光电化学性能是基于 EDAS/(TiO(2)-Au)(nps)纳米复合材料中界面电荷转移过程的有益促进来解释的。在 TiO(2)颗粒上最佳的 Au(nps)负载量下，实现了 12.3 mA cm(-2)的甲醇氧化峰电流密度。这种新型的胺功能化 EDAS 硅酸盐溶胶-凝胶稳定的核壳（TiO(2)-Au)(nps)纳米材料可能是光催化和光电化学应用的优秀候选材料。
