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Electroless Synthesis of Highly Stable and Free‐Standing Porous Pt Nanotube Networks and their Application in Methanol Oxidation
ChemElectroChem ( IF 4 ) Pub Date : 2018-02-15 , DOI: 10.1002/celc.201701271
Torsten Walbert 1 , Markus Antoni 1 , Falk Muench 1 , Thomas Späth 1 , Wolfgang Ensinger 1
Affiliation  

Free‐standing 3D metal nanostructures represent an upcoming class of electrocatalysts for fuel cell technology, combining high aging stability and activity with efficient metal utilization while abstaining from additives such as polymer binders. Until now, most fabrication routes are complex and produce disordered nanostructures. Here, we present a highly adjustable, wet‐chemical synthesis route toward ordered, thin‐walled Pt nanotube networks. The approach includes an optimized electroless plating procedure and enables easy regulation of structural parameters (i. e. nanotube diameter, wall thickness, density) by using ion track‐etched polycarbonate templates. In comparison to individual nanotubes, the resulting nanonetworks exhibit a free‐standing and robust frame, which is a great advantage for use in various electrochemical and catalytic applications. Cyclic voltammetry studies of the methanol oxidation reaction demonstrate enhanced electrocatalytic activity compared to commercially available Pt nanoparticles. The nanonetworks provide outstanding long‐life stability with up to 97 % of the initial active surface area after 1000 cycles, which makes them a promising material in different application fields, for example, in direct methanol fuel cells.

中文翻译:

高稳定,自由位多孔Pt纳米管网络的化学合成及其在甲醇氧化中的应用

独立的3D金属纳米结构代表了燃料电池技术中即将出现的一类电催化剂,将高的老化稳定性和活性与有效的金属利用率结合在一起,同时避免了诸如聚合物粘合剂之类的添加剂。到目前为止,大多数制造路线都很复杂,并且会产生无序的纳米结构。在这里,我们提出了一种高度可调节的,湿化学合成路线,用于有序的薄壁Pt纳米管网络。该方法包括优化的化学镀程序,并可以通过使用离子轨迹蚀刻的聚碳酸酯模板轻松调节结构参数(即纳米管直径,壁厚,密度)。与单个纳米管相比,所得的纳米网络具有独立且坚固的框架,对于在各种电化学和催化应用中使用而言,这是一个巨大的优势。与市售Pt纳米颗粒相比,甲醇氧化反应的循环伏安法研究显示出增强的电催化活性。纳米网络具有出色的长寿命稳定性,经过1000次循环后其初始活性表面积高达97%,这使其成为不同应用领域中有希望的材料,例如直接甲醇燃料电池。
更新日期:2018-02-15
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