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首页> 外文期刊>Advanced Functional Materials >Incorporation of Functionalized Palladium Nanoparticles within Ultrathin Nafion Films: A Nanostructured Composite for Electrolytic and Redox-Mediated Hydrogen Evolution
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Incorporation of Functionalized Palladium Nanoparticles within Ultrathin Nafion Films: A Nanostructured Composite for Electrolytic and Redox-Mediated Hydrogen Evolution

机译：超薄Nafion薄膜中功能化钯纳米粒子的合并：纳米结构的复合材料，用于电解和氧化还原介导的氢气释放

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A novel ultrathin Nafion-palladium nanocomposite film is developed by incorporating positively charged Pd nanoparticles, stabilized with dimethylaminopyridine (DMAP), into Nafion Langmuir-Schaefer (LS) films. The films show considerable activity for the redox-catalyzed hydrogen-evolution reaction, the rate of which scales with film thickness. The Nafion film can be deposited on both insulating (glass) and electrode (indium-tin oxide) surfaces. The quantity of Pd nanoparticles immobilized can be controlled simply via the thickness of the Nafion film. The morphology of the films are investigated using AFM, which allows the number density of nanoparticles to be estimated for the thinnest (10 layers; 18 nm) films. Incorporation of nanoparticles is also determined with cyclic voltammetry and UV-visible spectroscopy. The former method allows estimation of the electro-chemically active surface area of Pd wired to the underlying electrode. A novel scanning electrochemical microscopy (SECM) approach is used to investigate the kinetics of the hydrogen evolution reaction (HER) catalyzed by Pd nanoparticles within the Nafion film, which allows the intrinsic activity to be determined. Single nanoparticle reactivities are extracted and are comparable to the activity of native nanoparticles on glass and to bulk Pd. It is found that neither Nafion encapsulation nor DMAP functionalization impair the electrocatalytic activity of these nanoparticles towards the HER. Nafion encapsulation thus provides a framework for the formation of interfaces, whose activity scales with film thickness. The creation of 3D materials opens up the possibility of carrying out redox-mediated hydrogen evolution using solution species as the electron donor.
机译：通过将用二甲氨基吡啶（DMAP）稳定的带正电的Pd纳米颗粒掺入Nafion Langmuir-Schaefer（LS）膜中，从而开发出新颖的超薄Nafion-钯纳米复合膜。该膜对氧化还原催化的氢析出反应显示出相当大的活​​性，其速率随膜厚而缩放。 Nafion膜可以沉积在绝缘（玻璃）和电极（氧化铟锡）表面上。可以简单地通过Nafion膜的厚度控制固定的Pd纳米颗粒的量。使用AFM研究了薄膜的形态，这可以估算最薄（10层； 18 nm）薄膜的纳米粒子数量密度。纳米颗粒的掺入也通过循环伏安法和紫外可见光谱法确定。前一种方法可以估算连接到下面电极的Pd的电化学活性表面积。一种新颖的扫描电化学显微镜（SECM）方法用于研究Nafion膜中Pd纳米颗粒催化的析氢反应（HER）的动力学，从而确定其固有活性。提取了单个纳米颗粒的反应性，可与玻璃上的天然纳米颗粒的活性和大量Pd相媲美。发现Nafion包封或DMAP功能化均不损害这些纳米颗粒对HER的电催化活性。因此，Nafion封装为界面的形成提供了框架，其界面活性随薄膜厚度而定。 3D材料的创建打开了使用溶液物种作为电子供体进行氧化还原介导的氢释放的可能性。

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