碳载PtCu催化剂的制备及对甲醇的电催化氧化性能研究

Preparation of carbon supported PtCu catalyst and its electrocatalytic oxidation of methanol

以L-抗坏血酸(VC)为还原剂通过微波辅助法在乙二醇(EG)体系中制备了不同原子比的碳载PtCu纳米催化剂,运用循环伏安法、计时电流法、X射线粉末衍射仪(XRD)、场发射扫描电子显微镜(FESEM)等方法和手段,对催化剂在酸性甲醇溶液中的电催化活性、稳定性、结构和形貌进行了研究。电化学测试结果表明,在pH=5时进行还原的Pt、Cu原子比为1∶1的PtCu/C催化剂活性最高,稳定性最好。表征后发现该催化剂粒径最小,比表面积最大,并且分布均匀,与测试结果一致,即对甲醇的氧化具有优异的电催化性能。在降低铂基催化剂成本和提高催化剂活性方面具有一定的价值。

Carbon supported PtCu nanocatalysts with different atomic ratios were synthesized by microwaveassisted method in ethylene glycol system(EG) using L-ascorbic acid(VC)as a reductant.The prepared catalysts were used to electrocatalysis methanol under acidic conditions.The electrocatalytic activity and stability were studied by cyclic voltammetry and chronoamperometry techniques.These catalysts were characterized by X-ray powder diffractometer and field emission scanning electron microscope.The electrochemical test results show that the catalyst reduced at pH=5 has the highest activity and the best stability when the atomic ratio of Pt∶Cu=1∶1.It was found that the catalyst has the smallest particle size, the largest specific surface area and a uniform distribution, which is consistent with the test results, indicating excellent electrocatalytic oxidation activity for methanol.It has wide value in reducing the cost and improving catalyst activity of platinum-based catalysts.