Without introducing any surfactants and capping agents, concave Pt nanocubes, willow-like Pt nanocrystals, and spherical Pt nanoparticles were synthesized at different deposition potentials using a square-wave potential electrodeposition procedure. As the deposition potentials decreased from the double layer region to the hydrogen underpotential deposition region and finally into the hydrogen evolution reaction region under acidic conditions, the morphology of Pt nanocrystals changed from spherical Pt nanoparticles to willow-like Pt nanocrystals and finally to concave Pt nanocubes. We took advantage of the unique features of hydrogen adsorption/desorption on the surface of Pt in different potential regions to achieve the shape-controlled synthesis of Pt nanocrystals, and the different degrees of interaction between hydrogen and Pt played a key role in obtaining nanocrystals with various shapes. Concave Pt nanocubes exhibited excellent electrocatalytic activity to the ethanol oxidation reaction, as compared to commercial Pt/C catalysts. The peak current density in the positive scan of concave Pt nanocubes was 2.3 mA cm^–2, which was 4.7 times higher than that of commercial Pt/C.

中文翻译：

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氢吸附/解吸电沉积法制备凹形Pt和柳色Pt纳米催化剂的形控合成及其对乙醇氧化反应的电催化性能研究

在不引入任何表面活性剂和封端剂的情况下，使用方波电位电沉积程序在不同的沉积电位下合成了凹形Pt纳米立方体，柳叶状Pt纳米晶体和球形Pt纳米颗粒。随着沉积电位从双层区域下降到氢不足位沉积区域并最终进入酸性条件下的氢释放反应区域，Pt纳米晶体的形态从球形Pt纳米颗粒变为柳状Pt纳米晶体，最后变为凹形Pt纳米立方体。我们利用氢在不同电位区域中Pt表面吸附/解吸的独特功能，来实现Pt纳米晶体的形状控制合成，氢和铂之间不同程度的相互作用在获得各种形状的纳米晶体中起着关键作用。与商用Pt / C催化剂相比，凹形Pt纳米立方体对乙醇氧化反应表现出出色的电催化活性。凹形Pt纳米立方体的正扫描中的峰值电流密度为2.3 mA cm^–2，是商业Pt / C的4.7倍。