石墨烯载体上直接合成具有Pt(100)择优取向的催化剂及其电催化性能研究

Study on Direct Synthesis of Pt(100) Preferential Orientation Catalyst on Graphene Support and Its Electrocatalytic Performance

摘要:

以石墨烯为载体，乙二醇为还原剂，采用油浴法，通过加入不同添加剂作为形状导向剂合成了Pt(100)晶面择优取向的催化剂，并探讨了催化剂的性能。利用X射线衍射仪(XRD)、透射电镜(TEM)、感应耦合等离子原子发射光谱 (ICP-AES)及扫描电镜(SEM)对所合成的催化剂进行微观表征，利用电化学工作站对所合成的催化剂进行电化学性能测试。结果表明，添加KBr参与合成的Pt(100)晶面取向的催化剂，其微观粒子的立方体形貌最为规整，且形成最彻底。同时，其电催化性能最优，电化学活性表面积为42.43m2/g，对乙醇氧化的峰值电流密度为417.67A/g，1100s的稳态电流密度值为149.50A/g，对乙醇催化氧化反应的活化能最低，对乙醇氧化峰电流密度保持率为82.26%。

Abstract:

Using graphene as the carrier and ethylene glycol as the reducing agent, an oil bath method was used to synthesize a Pt(100) crystal face preferential orientation catalyst by adding different additives as shape directing agents, and the performance of the catalyst was discussed. Use X-ray diffractometer (XRD), transmission electron microscope (TEM), inductively coupled plasma atomic emission spectrometry (ICP-AES) and scanning electron microscope (SEM) to microscopically characterize the synthesized catalyst, and use electrochemical workstation to analyze the synthesized catalyst Conduct electrochemical performance tests. The results show that the Pt(100) crystal plane orientation catalyst added with KBr has the most regular cubic morphology and the most complete formation. At the same time, its electrocatalytic performance is the best. The electrochemically active surface area is 42.43m2/g, the peak current density for ethanol oxidation is 417.67A/g, and the steady-state current density value for 1100s is 149.50A/g, which is catalytic oxidation reaction for ethanol. The activation energy is the lowest, and the retention rate of the peak current density of ethanol oxidation is 82.26%.