Hameed R M Abdel, Amin R S, El-Khatib K M, Fetohi Amani E
Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt.
Chemical Engineering Department, National Research Center, Dokki, Giza, Egypt.
Chemphyschem. 2016 Apr 4;17(7):1054-61. doi: 10.1002/cphc.201501072. Epub 2016 Feb 2.
Pt-CeO2 /C, Pt-TiO2 /C, and Pt-ZrO2 /C electrocatalysts were prepared by using a modified microwave-assisted polyol process. Physical characterization was performed by using XRD, TEM, and EDX analyses. The incorporation of different metal oxides increased the dispersion degree of Pt nanoparticles and reduced their diameter to 2.50 and 2.33 nm when TiO2 and ZrO2 were introduced to Pt/C, respectively. The electrocatalytic activity of various electrocatalysts was examined towards methanol oxidation in H2 SO4 solution by using cyclic voltammetry, chronoamperometry, and electrochemical impedance spectroscopy. Among the studied composites, Pt-ZrO2 /C was selected to be a candidate electrocatalyst for better electrochemical performance in direct methanol fuel cells.
采用改进的微波辅助多元醇法制备了Pt-CeO2 /C、Pt-TiO2 /C和Pt-ZrO2 /C电催化剂。通过X射线衍射（XRD）、透射电子显微镜（TEM）和能谱分析（EDX）进行物理表征。当分别将TiO2和ZrO2引入Pt/C时，不同金属氧化物的掺入提高了Pt纳米颗粒的分散度，并将其直径减小至2.50和2.33 nm。采用循环伏安法、计时电流法和电化学阻抗谱研究了各种电催化剂在H2 SO4溶液中对甲醇氧化的电催化活性。在所研究的复合材料中，Pt-ZrO2 /C被选为直接甲醇燃料电池中具有更好电化学性能的候选电催化剂。
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