扫帚状氧化铈制备及其对Pt基阳极催化剂催化性能的影响

采用水热合成法，合成了比表面积为175 m²·g^-1，孔径在2~4nm范围内的扫帚状CeO₂。通过微波辅助乙二醇还原氯铂酸法制备了Pt-CeO₂/RGO催化剂，探究扫帚状CeO₂的添加对Pt基催化剂电催化性能的影响。利用X射线衍射仪（XRD）、扫描电镜（SEM）、N₂吸附-脱附、X射线光电子能谱（XPS）对所制备的CeO₂及催化剂进行表征。利用电化学工作站对催化剂进行电化学性能测试。结果表明，催化剂中CeO₂保持原有扫帚状，Pt纳米粒子均匀分布于石墨烯载体表面；当m_RGO∶m_CeO2=1∶2时，添加了扫帚状CeO₂的Pt-CeO₂/RGO催化剂的电催化性能最优，电化学活性表面积为102.83 m²·g^-1，对乙醇氧化的峰值电流密度为757.17 A·g^-1，1 000 s的稳态电流密度为108.17 A·g^-1，对乙醇催化氧化反应的电荷转移电阻最小，活化能最低。

High Specific Area Cerium Oxide: Synthesis and Effect on Catalytic Performance of Pt-Based Catalysts

A broom-like CeO₂ with a specific surface area of 175 m²·g^-1 and a pore size of 2~4 nm was synthesized by hydrothermal method. The Pt-CeO₂/RGO catalyst was prepared by the microwave-assisted ethylene glycol reduction chloroplatinic acid method, and the effect of the addition of broom-like CeO₂ on the electrocatalytic performance of Pt-based catalysts was investigated. The prepared CeO₂ and catalyst were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), N₂ adsorption-desorption, and X-ray photoelectron spectroscopy (XPS). The electrochemical performance of catalysts was tested by electrochemical workstation. The results showed that the CeO₂ in the catalyst remains in the form of a broom, and the Pt nanoparticles are evenly distributed on the surface of graphene carrier. When the mass ratio of RGO to CeO₂(m_RGO:m_CeO2) is 1:2, the electrocatalytic performance of the Pt-CeO₂/RGO catalyst with broom-like CeO₂ is the best, the electrochemical active surface area was 102.83 m²·g^-1, the peak current density of ethanol oxidation was 757.17 A·g^-1, the steady-state current density of 1 000 s was 108.17 A·g^-1, the charge transfer resistance of the catalytic oxidation reaction of ethanol is the smallest and the activation energy is the lowest.