柔性Pd@PANI/rGO纸阳极在甲醇燃料电池中的应用

利用脉冲电压法在自组装制得的柔性石墨烯纸表面聚合聚苯胺,以该复合材料作为甲醇燃料电池的阳极电极基体,采用循环伏安法在其表面电沉积纳米Pd制备出无需外加粘接和支撑的催化电极。通过扫描电子显微镜、X射线光电子能谱和红外光谱分析该材料的表面形貌和化学组成,并通过电化学测试该电极在甲醇氧化过程中的催化性能。结果表明,该阳极材料柔韧性好,原料利用率高,聚苯胺在石墨烯纸表面分散良好,形貌均一,聚苯胺的存在提高了催化剂的催化效率,使得甲醇的氧化峰电流密度从3 mA·mg~(-1)提高到67 mA·mg~(-1),且延长了催化剂的使用寿命,正向与反向扫描的阳极峰值电流密度的比值(jf/jb值)达到5.7。

Flexible Pd@PANI/rGO Paper Anode for Methanol Fuel Cells

Polyaniline was synthesized on the surface of flexible graphene paper by pulse voltage method. The composite material was used as free-standing and binder-free electrode and catalyst support in methanol fuel cells with deposited Pd nanoparticles via cyclic voltammetry. The surface morphology and chemical composition of the material were analyzed by scanning electron microscopy, X-ray photoelectron spectroscopy, and infrared spectroscopy, and the electrocatalytic performance of the electrode was investigated. The results show that graphene paper is flexible, that this fabrication procedure is efficient, and that polyaniline on the surface of the graphene paper is homogeneous. The existence of polyaniline can improve catalytic efficiency since the methanol oxidation peak current density increased from 3 mA·mg^-1 to 67 mA·mg^-1 with the addition of polyaniline. The lifespan of the catalyst is also prolonged according to I_f/I_b value (the oxidation peak current density ratio of forward scan and reverse scan) reaching 5.7.