【作者】 李忠水； 王艳丽； 雷丰玲； 许淑虹； 林深；

【Author】 Zhongshui Li;Yan Li Wang;Fengling Lei;Shuhong Xu;Shen Lin;College of Chem.& Chem.Engin.,Fujian Normal Univ.;

【机构】 福建师范大学化学与化工学院；

【摘要】 直接甲醇燃料电池因其易操作、清洁环保、高能量密度等优点在可移动能源设备领域广受关注,但较为缓慢的电极反应过程及Pt系催化剂易受中间产物毒化等因素极大程度上影响其广泛应用,因此目前的研究聚焦于如何提高Pt基催化剂的催化性能^[1,2]。本文采用一锅水热法同步还原的方式合成了Pt/PANi/3D GNs复合物,通过急速冷却降温产生的温度骤变来获得多孔立体结构的三维石墨烯复合物Pt/PANi/3D GNs（图1）。在水热条件下,借助的Pt的催化作用,实现PANi的原位聚合,因而无需加入聚合氧化剂。PANI的产生也促使形成颗粒细小且大小均匀的Pt纳米粒子（平均粒径3 nm）（图2）,实现Pt的高度分散性且与3D石墨烯的良好界面接触,达到有效提升催化剂对甲醇氧化的电催化性能。电化学实验表明,Pt/PANi/3D GNs复合物对甲醇氧化呈现良好的电催化性能（图3）更多还原

【Abstract】 Direct methanol fuel cells(DMFCs) have attracted much attention as a portable energy source due to its easy-to-handle, clean liquid fuel nature and high specific energy. However, two key barriers to their commercialization are sluggish electrode kinetics and easier poisoning by CO. So intensive research has been focus on developing Pt-based catalysts with high electrocatalytic performance. In this work, one pot hydrothermal method was used to synthesize Pt/PANi/3D GNs as DMFCs anodic electrocatalyst by a synchronous reduction process. With the rapid cooling, obvious three dimensional(3D) porous Pt/PANi/3D graphene composite(simplified as Pt/PANi/3D GNs) can be obtained(Fig. 1). The polymerization of polyaniline is proceeding in situ without the addition of polymerization oxidant, with the aid of Pt as a catalyst. The introduction of PANi in situ allows the optimization of diameter and distribution for Pt nanoparticles with the average diameter of 3nm(Fig. 2). The highly dispersive Pt nanopartilces are in favor of a good contact between Pt and 3D supports, which results in much higher electrocatalytic activity of Pt/PANi/3DGNs for methanol oxidation reaction(Fig. 3).更多还原