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首页> 外文期刊>RSC Advances >Highly dispersed platinum nanoparticles supported on silica as catalyst for hydrogen production
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Highly dispersed platinum nanoparticles supported on silica as catalyst for hydrogen production

机译：负载在二氧化硅上的高度分散的铂纳米颗粒作为制氢催化剂

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摘要

A synthetic approach is developed to produce highly disperse, low loading (3.28 wt%) Pt nanoparticles incorporated silica (Pt-NP-S) with average diameter of 3.5 nm using economical and simple surface chemical modification and reduction processes. This was achieved by using silica modified by dithiocarbamate functional groups treated with a solution of hexachloroplatinic acid followed by chemical reduction to produce Pt nanoparticles incorporated silica support. The physicochemical characterizations of the Pt nanoparticles incorporated silica were performed by elemental analysis, FTIR, TGA, chemisorption analysis and transmission electron microscopy. The results show that the Pt nanoparticles were uniformly distributed throughout the silica support with Pt loading of 3.2 wt% and particle diameter ranging from 2 to 5 nm. The electrocatalytic activity and stability for hydrogen evolution reaction were evaluated using cyclic voltammetry and chronoamperometry. At more negative potential than the hydrogen evolution of -250 mV vs. SCE, the catalyst shows high activity for hydrogen evolution with current density of 11.90 A g(Pt)(-1) mV(-1). The preparation procedure is simple and favorable for a variety of metal nanoparticles syntheses for catalysis applications.
机译：开发了一种合成方法，可使用经济，简单的表面化学改性和还原工艺生产平均粒径为3.5 nm的掺有二氧化硅（Pt-NP-S）的高分散，低负载（3.28 wt％）的Pt纳米颗粒。这是通过使用经二硫代氨基甲酸酯官能团改性的二氧化硅（经六氯铂酸溶液处理），然后化学还原以制备掺入二氧化硅载体的Pt纳米颗粒来实现的。通过元素分析，FTIR，TGA，化学吸附分析和透射电子显微镜对掺入二氧化硅的Pt纳米颗粒的理化特性进行了表征。结果表明，Pt纳米颗粒均匀分布在整个二氧化硅载体上，Pt负载为3.2 wt％，粒径为2至5 nm。使用循环伏安法和计时电流法评估了析氢反应的电催化活性和稳定性。与-SCE相比，在比-250 mV的氢气放出更多的负电势下，该催化剂显示出高的氢气释放活性，电流密度为11.90 A g（Pt）（-1）mV（-1）。该制备方法简单且有利于用于催化应用的多种金属纳米颗粒合成。

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