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Colloidal Syntheses of Shape- and Size-Controlled Pt Nanoparticles for Electrocatalysis

机译：形状和尺寸可控的Pt纳米粒子的胶体合成用于电催化

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摘要

Different colloidal synthesis methods of platinum nanoparticles with controlled sizes and shapes that are relevant for electrocatalysis studies are reviewed. Four main methods, i.e., water in oil microemulsion (w/o) method, polyacrylate (PA) method, tetradecyltrimethylammonium bromide (TTAB) method, and ethylene glycol method, are used to synthesize platinum nanoparticles. The PA method allowed us to synthesize reproducibly nanocubes, nanooctahedrons, or nanocuboctahedrons/truncated nanooctahedrons with size between 8 and 10 nm, the TTAB method led to the synthesis of nanocubes of about 10 nm, and the w/o method allowed the synthesis of spherical particles of about 3 nm. All these samples could be cleaned for further electrochemical characterization of their surface structure by hydrogen underpotential deposition and by spontaneous deposition and oxidation of bismuth and germanium, leading to a quantitative determination of the (100) and (111) surface domains. The samples prepared by the ethylene glycol method, in the presence or not of polyvinylpyrrolydone as surfactant, were size or shape controlled, but did not allow the electrochemical characterization of their surface due to remaining of strongly adsorbed organic species even after cleaning steps.
机译：综述了与电催化研究相关的具有受控大小和形状的铂纳米粒子的不同胶体合成方法。四种主要方法，即油包水微乳液（w / o）法，聚丙烯酸酯（PA）法，十四烷基三甲基溴化铵（TTAB）法和乙二醇法，被用于合成铂纳米粒子。 PA方法使我们能够可再生地合成尺寸在8至10 nm之间的纳米立方体，纳米八面体或纳米立方八面体/截短的纳米八面体，TTAB方法可合成约10 nm的纳米立方体，而w / o方法可合成球形约3nm的颗粒。所有这些样品都可以清洗，以通过氢不足位沉积以及铋和锗的自发沉积和氧化来进一步电化学表征其表面结构，从而定量确定（100）和（111）表面域。在存在或不存在聚乙烯吡咯烷酮作为表面活性剂的情况下，通过乙二醇法制备的样品均受到尺寸或形状的控制，但是由于即使在清洁步骤后仍保留有强烈吸附的有机物，因此无法对其表面进行电化学表征。

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