摘要
本文利用低温水热法合成了氧化钽-石墨烯负载钯纳米粒子催化剂(Pd/Ta_2O_5-GN),采用X射线衍射、扫描电子显微镜、透射电子显微镜对样品的晶形、形貌等进行了表征,并利用循环伏安法测试了其对甲醇的电催化氧化活性。结果表明,该催化剂在碱性条件下对甲醇的电催化有较高的活性,通过测得的i-t曲线发现相比于商业铂碳(10%),该催化剂的稳定性要优于商业铂碳。另外,在同等条件下测得该催化剂的电流密度大于商业铂碳,且Pd/Ta_2O_5-GN催化剂对甲醇的氧化峰相比商业铂碳发生了负偏移,与商业铂碳(10%)相比甲醇在Pd/Ta_2O_5-GN修饰的电极上容易被氧化。
Palladium nanoparticles loading tantalum oxide-graphene electrocatalyst(Pd/Ta_2O_5-GN) particles were synthesized using a low temperature hydrothermal method. The crystal phase and morphology of samples were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM) and transmission electron microscopy(TEM). The electrocatalytic activity of Pd/Ta_2O_5-GN was investigated for the methanol electro-oxidation with cyclic voltammetry(CV). The results indicated that the Pd/Ta_2O_5-GN had excellent electrocatalytic activity for the methanol oxidation in alkaline medium.The stability of Pd/Ta_2O_5-GN modified electrode is higher than the commercial Pt/C(10%) with i-t curve. At the same conditions, the current density of samples is higher than commercial Pt/C(10%). In addition, the oxide peak potential to methanol oxidation is negative transfer for the commercial Pt/C(10%). The result implied that the methanol oxidation change easy at the Pd/Ta_2O_5-GN modified electrode.
引文
