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The role of surface chemistry of modified MWCNT on the development and characteristics of Pt supported catalysts
Nano-Structures & Nano-Objects Pub Date : 2020-09-16 , DOI: 10.1016/j.nanoso.2020.100566
Eirini Zagoraiou , Fotios Paloukis , Maria K. Daletou

The performance and stability of electrocatalysts strongly depend on the physicochemical characteristics, such as the surface area, the crystalline structure, size and shape of the particles and the interactions with the support. Platinum (Pt) is one of the most versatile elements in catalysis, efficiently mediating a multitude of chemical reactions. Reducing the demand for expensive Pt is a major driving force in catalysis research. The objective of the present study is the development of electrocatalysts with innovative features and focuses on the synthesis and characterization of highly dispersed Pt supported catalysts using functionalized Multi-Wall Carbon Nanotubes (f-MWCNT) as the substrate. The choice of the substrate was based on the unique properties of carbon nanotubes that generate strong interest for their use in many nano-material devices in catalysis, batteries, optics, gas storage, electronics, sensors and others. Various chemical pathways were used to modify the sidewalls of MWCNT and introduce several covalently attached groups like pyridine, sulfonic acid, carboxyl, benzene or zwitterion type moieties. Using these substrates, deposition of Pt nanoparticles was realized by means of the polyol synthetic procedure. The parameters of the synthetic procedure differentiate the reduction/deposition mechanism. The surface chemistry and functionalities of the support and the diverse reaction conditions resulted in differentiations of the properties, not only in terms of quantitative deposition, but also with respect to platinum oxidation state, nanoparticle size and dispersion and overall catalyst morphology. The combined characterization techniques used shed light into the fundamental understanding of the support effect on the final properties, while metal-support interactions are intensely discussed.



中文翻译:

改性多壁碳纳米管的表面化学性质对铂负载型催化剂的发展及特性的影响

电催化剂的性能和稳定性在很大程度上取决于物理化学特征,例如表面积,晶体结构,颗粒的大小和形状以及与载体的相互作用。铂(Pt)是催化中用途最广泛的元素之一,可有效介导多种化学反应。减少对昂贵的Pt的需求是催化研究的主要动力。本研究的目的是开发具有创新功能的电催化剂,并致力于使用功能化的多壁碳纳米管(f-MWCNT)作为底物,对高度分散的Pt负载的催化剂进行合成和表征。基板的选择基于碳纳米管的独特性能,碳纳米管在催化,电池,光学,气体存储,电子,传感器等领域的许多纳米材料设备中的使用引起了极大的兴趣。各种化学途径用于修饰MWCNT的侧壁并引入几个共价连接的基团,如吡啶,磺酸,羧基,苯或两性离子型部分。使用这些基底,通过多元醇合成方法实现了Pt纳米颗粒的沉积。合成过程的参数区分还原/沉积机理。载体的表面化学和功能以及不同的反应条件导致特性的差异,不仅在定量沉积方面,而且还涉及铂的氧化态,纳米颗粒大小和分散度以及催化剂的整体形态。所使用的组合表征技术阐明了载体对最终性能的基本理解,同时对金属与载体的相互作用进行了深入讨论。

更新日期:2020-11-03
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