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首页> 外文期刊>RSC Advances >Dendrimer confined Pt nanoparticles: electro-catalytic activity towards the oxygen reduction reaction and its application in polymer electrolyte membrane fuel cells
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Dendrimer confined Pt nanoparticles: electro-catalytic activity towards the oxygen reduction reaction and its application in polymer electrolyte membrane fuel cells

机译：树枝状聚合物限制的Pt纳米颗粒：对氧还原反应的电催化活性及其在聚合物电解质膜燃料电池中的应用

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摘要

Dendrimers have shown as a promising candidate in controlling the size, shape and avoid agglomeration of the metal nanoparticles. Platinum nanoparticles are stabilized by fourth generation amine terminated poly(amidoamine) (G4-PAMAM) dendrimers and anchored successively onto carbon by two methods, namely ester functionalization (Pt-DENs/Cest) and active anhydride functionalization (Pt-DENs/Canh) as the cathode catalyst in polymer electrolyte membrane fuel cells (PEMFCs). The effects of pH and reaction time on the complexation reaction are examined by the UV-vis spectroscopic technique. The electronic and structural features of nanoparticles are studied by X-ray photoelectron spectroscopy (XPS), the X-ray diffraction technique (XRD) and Transmission Electron Microscopy (TEM). Electrochemical behaviour and catalytic activity of the catalysts are studied by cyclic voltammograms (CV) and linear sweep voltammograms (LSV) in N-2 and O-2 saturated 0.1 M aqueous HClO4. Effect of functionalization is studied and a significant result has been observed. The PEMFC performance of the catalysts synthesized using the dendrimer was compared with the catalyst without the dendrimer. Pt-DENs/Canh show significant performance over Pt/C prepared in the absence of the dendrimer.
机译：在控制金属纳米颗粒的尺寸，形状和避免团聚方面，树状聚合物已显示出是有希望的候选物。铂纳米颗粒通过第四代胺封端的聚（酰胺基胺）（G4-PAMAM）树状聚合物稳定，并通过两种方法依次锚固在碳上，即酯官能化（Pt-DENs / Cest）和活性酸酐官能化（Pt-DENs / Canh），聚合物电解质膜燃料电池（PEMFC）中的阴极催化剂。 pH和反应时间对络合反应的影响通过紫外-可见光谱技术检查。通过X射线光电子能谱（XPS），X射线衍射技术（XRD）和透射电子显微镜（TEM）研究了纳米粒子的电子和结构特征。通过循环伏安图（CV）和线性扫描伏安图（LSV）在N-2和O-2饱和0.1 M HClO4中研究了催化剂的电化学行为和催化活性。研究了功能化的效果，并观察到了显着的结果。将使用树枝状聚合物合成的催化剂与没有树枝状聚合物的催化剂的PEMFC性能进行比较。 Pt-DENs / Canh的性能优于不存在树枝状聚合物的情况下制备的Pt / C。

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