燃料电池阴极Pt-Fe/C纳米线粒体网络电催化剂研究

本项目以克服质子交换膜燃料电池传统阴极催化剂的氧还原动力学较慢，耐久性偏低以及成本较高等问题为出发点，研究Pt-Fe/C合金纳米线立体网络电催化剂(Pt-Fe/C NWNs)的制备方法及其中的科学问题。本项目将从催化剂组成和结构调变两个方面来进行，拟用阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)为软模板合成Pt-Fe/C NWNs。通过对该催化剂独特形态和结构的控制，以期实现较高的传质、电子传输、贵金属利用率和耐久性。考察合成条件对催化剂结构和性能影响，从而确定最佳的制备条件；以最佳的条件合成Pt-Fe/C NWNs作为燃料电池阴极，研究其发电性能和耐久性，并分析Pt-Fe/C NWNs的高活性和长耐久性机理。本项目研究不仅会对燃料电池技术进步起到积极推动作用，还会增进对Pt-Fe/C NWNs形成机制和控制策略理解，从而加深对燃料电池催化剂复杂体系"制备-结构-性能"关系的认识。

The project is to overcome several factors including the high costs of the traditional electrocatalysts, the sluggish kinetics of oxygen reduction reaction (ORR) and the relatively low durability for proton exchange membrane fuel cells (PEMFCs), and it also investigate the preparation methods and the scientific problems of the Pt-Fe/C alloy nanowires networks structure catalyst (Pt-Fe/C NWNs). This project will be employed two aspects to improve electrocatalytic activity, e.g., by the incorporation of a second element (alloying) and through nanostructure control strategies, and we adopt the synthesis of platinum-iron alloy nanowire networks (Pt-Fe/C NWNs) using a simple and inexpensive surfactant cetyltrimethylammonium bromide (CTAB) based soft-template procedure. Through the unique morphology and structure of catalyst were controlled, in order to realize high mass transfer, electron transport, precious metals utilization efficiency and durability. Investigation of synthesis conditions affect catalyst structures and performance, so as to determine the best preparation conditions; The Pt-Fe/C NWNs prepared under the best synthesis condition act as cathode catalyst, and study the cell performance and durability, and analyzes highly activity and long durability mechanism of Pt-Fe/C NWNs. The studies in the project will not only to fuel cell technology plays a positive role in promoting the progress, but also will understand Pt-Fe/C NWNs forming mechanism and the control strategy, and understand deeply the fuel cell catalyst complicated system and relationship of "preparation-structure-performance" understanding of the relationship.