直接甲醇燃料电池强抗中毒光助阳极的构筑与催化特性研究

One of problems blocking DMFC from commercialization is the slow kinetics of methanol electro-oxidation due to CO poisoning to the Pt-based anodic catalysts, resulting in a serious decline in the performance of DMFC. How to effectively remove of CO poison is the key to improve the performance of DMFC. In this application, we present an anti-poisoning anode enhanced by illumination. A Pt/TiNTs/FTO electrode is prepared by electrochemically depositing Pt onto TiO2 nanotube arrays (TiNTs) fabricated by the anodic oxidation of a sputtering Ti layer supported on a conductive glass (FTO) substrate. The catalytic activity of the Pt/TiNTs/FTO and the performance of a DMFC single cell with the Pt/TiNTs/FTO anode can be significantly improved, resulting from the greatly increased anti-poison ability of Pt catalyst on TiNTs/FTO against the intermediate of methanol oxidation under illumination, which is in that TiO2 nanotube can be both the catalyst support and the co-catalyst and fully involved in the electro-oxidation of methanol on Pt surface (through the use of) based on the physical properties of FTO and the photo-catalytic activity and the semiconducting property of TiO2 nanotube.

贵金属Pt催化剂易被甲醇氧化的中间产物毒化是制约直接甲醇燃料电池（DMFC）商业化的主要原因之一。针对此问题，本申请提出基于Pt催化剂的"抗中毒光助阳极"。拟采用磁控溅射和电化学的方法将Pt纳米颗粒可控沉积于负载在导电玻璃（FTO）表面的二氧化钛纳米管阵列（TiNTs）中以获得Pt/TiNTs/FTO催化电极。通过利用导电玻璃的物理性质和TiO2纳米管的光催化活性及半导体性质，借助光照，使TiO2纳米管阵列兼具催化剂载体和助催化剂双重功能，并充分地参与到Pt表面甲醇电氧化的过程，以削弱甚至避免甲醇氧化中间体CO对Pt催化剂的毒化，从而大幅提高Pt催化剂的活性和以Pt/TiNTs/FTO为催化阳极的DMFC单电池的性能。