Sonochemical synthesis and characterization of Pt/CNT, Pt/TiO2, and Pt/CNT/TiO2 electrocatalysts for methanol electro-oxidation
Sonochemical synthesis and characterization of Pt/CNT, Pt/TiO2, and Pt/CNT/TiO2 electrocatalysts for methanol electro-oxidation
复制标题
DOI：
10.1016/j.electacta.2015.10.084
复制
发表时间：
2015-12-20
影响因子：
6.6
通讯作者：
Alonso-Nunez, G.
中科院分区：
文献类型：
--
作者：
Bedolla-Valdez, Z. I.;Verde-Gomez, Y.;Alonso-Nunez, G.
采用声化学法成功地制备了多壁碳纳米管/二氧化钛复合材料(CNT/TiO2)负载的铂催化剂，不需要热处理、表面活性剂和添加剂。该电催化剂可用于直接甲醇燃料电池(DMFC)。作为对比，制备了铂/碳纳米管和铂/二氧化钛电催化剂作为参比样品。用X射线衍射仪、透射电子显微镜、拉曼光谱、X射线光电子能谱对合成材料的结构和形貌进行了表征，并用Brunauer-Emmett-Teller方法测定了其比表面积。分别用电感耦合等离子体原子发射光谱分析和热重分析了铂和酸处理后碳纳米管的含量。用循环伏安法和计时电流法对所合成的电催化剂在室温下的电化学性能进行了评价。使用电化学技术进行的评估表明，由于二氧化钛-铂的相互作用，二氧化钛提高了CO耐受性。循环伏安测试表明，6wt.%的酸处理碳纳米管显著提高了铂与二氧化钛选择性相互作用时的电流密度。(C)2015爱思唯尔有限公司。保留所有权利。
Pt electrocatalyst supported on composite formed of multi-walled carbon nanotubes and titanium oxide (CNT/TiO2) was successfully synthesized by a sonochemical method without heat treatments, surfactants or additives. This electrocatalyst could be used for direct methanol fuel cells (DMFC) applications. For comparison, Pt/CNT and Pt/TiO2 electrocatalysts were prepared as reference samples. Structural properties and morphology of the synthesized materials were examined by X-ray diffraction, transmission electron microscopy, Raman spectroscopy, X-ray photoelectron spectroscopy and their specific surface areas were determined by the Brunauer-Emmett-Teller method. The Pt and acid-treated CNT contents were analyzed by inductively coupled plasma atomic emission spectroscopy and thermogravimetric analysis, respectively. The electrochemical properties of the synthesized electrocatalysts were evaluated by cyclic voltammetry (CV) and chronoamperometry in a three-electrode cell at room temperature. The evaluation performed using electrochemical techniques suggests that TiO2 promotes the CO-tolerance due to TiO2-Pt interaction. The CV tests demonstrated that 6 wt.% of acid-treated CNT increases significantly the current density when Pt selectively interacts with TiO2. (C) 2015 Elsevier Ltd. All rights reserved.