Enhanced Photoelectrocatalytic Activity of Methanol Oxidation on TiO2-Decorated Nanoporous Gold
Enhanced Photoelectrocatalytic Activity of Methanol Oxidation on TiO2-Decorated Nanoporous Gold
复制标题
TiO2 修饰的纳米多孔金增强甲醇氧化的光电催化活性
DOI：
10.1021/jp904191k
复制
发表时间：
2009-09-10
影响因子：
3.7
通讯作者：
Ding, Yi
中科院分区：
文献类型：
--
作者：
Jia, Chuancheng;Yin, Huiming;Ding, Yi
Au-TiO 2纳米复合材料因其在太阳能转化、CO氧化和甲醇重整反应中的潜在应用而受到广泛研究。在这项研究中，商业TiO 2纳米粒子组装在纳米多孔金（NPG）的表面，以制备新型的TiO 2/NPG纳米复合电极。电化学和光电化学技术被用来研究电极的特性。大的光电流和几乎可逆的伏安响应，观察到甲醇光电催化在紫外线辐射下，表明有效消除金表面钝化由于TiO 2和NPG之间的显着的协同效应。提出了一种可能的机理来阐明这种协同效应，这是基于在NPG表面的光生反应性中间体的反应。动力学研究表明，在我们的体系中，二氧化钛与NPG的耦合可以导致约30%的甲醇电氧化的表观活化能下降。
Au-TiO2 nanocomposites have been widely investigated for their potential applications in solar energy conversion, CO oxidation, and methanol reforming reactions. In this study, commercial TiO2 nanoparticles were assembled on the surface of nanoporous gold (NPG) to fabricate novel TiO2/NPG nanocomposite electrodes. Electrochemical and photoelectrochemical techniques were used to investigate the characteristics of the electrodes. Large photocurrent and nearly reversible voltammetric responses were observed for methanol photoelectrocatalysis under UV radiation, indicating an effective elimination of gold surface passivation due to a pronounced synergistic effect between TiO2 and NPG. A possible mechanism was proposed to elucidate such a synergistic effect, which is based on the reaction of the photogenerated reactive intermediates on the surface of NPG. Kinetic studies showed that the coupling of TiO2 with NPG in our system could lead to about a 30% decrease of apparent activation energy for methanol electrooxidation.