Synthesis of Pd-Pt Ultrathin Assembled Nanosheets as Highly Efficient Electrocatalysts for Ethanol Oxidation.,Chemistry - An Asian Journal

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Synthesis of Pd-Pt Ultrathin Assembled Nanosheets as Highly Efficient Electrocatalysts for Ethanol Oxidation.
Chemistry - An Asian Journal ( IF 3.5 ) Pub Date : 2020-03-18 , DOI: 10.1002/asia.202000041
Yeji Han ₁ , Jeonghyeon Kim ₂ , Su-Un Lee ₃ , Sang-Il Choi ₂ , Jong Wook Hong ₁

Affiliation

Control over composition and morphology of nanocrystals (NCs) is significant to develop advanced catalysts applicable to polymer electrolyte membrane fuel cells and further overcome the performance limitations. Here, we present a facile synthesis of Pd-Pt alloy ultrathin assembled nanosheets (UANs) by regulating the growth behavior of Pd-Pt nanostructures. Iodide ions supplied from KI play as capping agents for the {111} plane to promote 2-dimensional (2D) growth of Pd and Pt, and the optimal concentrations of cetyltrimethylammonium chloride and ascorbic acid result in the generation of Pd-Pt alloy UANs in high yield. The prepared Pd-Pt alloy UANs exhibited the remarkable enhancement of the catalytic activity and stability toward ethanol oxidation reaction compared to irregular-shaped Pd-Pt alloy NCs, commercial Pd/C, and commercial Pt/C. Our results confirm that the Pd-Pt alloy composition and ultrathin 2D morphology offer high accessible active sites and favorable electronic structure for enhancing electrocatalytic activity.

中文翻译：

Pd-Pt超薄组装纳米片的合成作为乙醇氧化的高效电催化剂。

控制纳米晶体（NCs）的组成和形态对于开发适用于聚合物电解质膜燃料电池的先进催化剂并进一步克服性能限制具有重要意义。在这里，我们介绍了通过调节Pd-Pt纳米结构的生长行为，方便地合成Pd-Pt合金超薄组装纳米片（UANs）。由KI提供的碘离子充当{111}平面的封端剂，以促进Pd和Pt的二维（2D）生长，并且十六烷基三甲基氯化铵和抗坏血酸的最佳浓度导致Pd-Pt合金UANs的生成。高产。与不规则形状的Pd-Pt合金NCs，市售Pd / C和市售Pt / C相比，制备的Pd-Pt合金UANs表现出显着增强的催化活性和对乙醇氧化反应的稳定性。

更新日期：2020-04-22

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