Studies on the production of metal nanoparticles from the dialkylimidazolium precursor on the graphitic substrate and on their properties and electrocatalytic applications
Date Issued
2014
Date
2014
Author(s)
Lin, Shih-Yao
Abstract
To avoid taking noble metal (ex: Platinum) as catalyst to oxidize alcohol or carboxylic acid, people use other element to produce different structure or size to enhance catalyst activity. In our research, we synthesized the nanoparticles from palladium, platinum and tin on highly oriented pyrolytic graphite (HOPG) to be the catalyst for oxidation of methanol, alcohol and formic acid. Using highly oriented pyrolytic graphite (HOPG) as substrate due to it didn’t need to restructure to suitable size for the electrode and the product of catalyst might be consumed in this procedure.
We used adsorption and reaction steps to synthesize the nanoparticles on the HOPG from dialkylimidazolium precursor. The nanoparticles would be dispersed on the HOPG by the interaction between graphitic substrate and imidazolium and by the stability of alkyl group in inert condition.
The nanomaterials was confirmed the enhancement of dispersion and size distribution by the surface analysis in this study. Furthermore, we could adjust the size and density of nanoparticles and produce bimetal nanoparticles by substrate treatment and modification of synthesis of nanoparticles. The performance of catalytic oxidation reaction was detected by cyclic voltammetry and chronoamperometry. The product made from imidazolium precursor got better performance of catalytic oxidation than normal precursor.
Due to carbon substrates were applied in different fields popularly, our method might produce different nanoparticles on other carbon substrates. Besides producing small and dispersed nanoparticles, out method could synthesize nanoparticles on the large area substrate and low consumption of precursor simultaneously.
Subjects
電化學
電催化
甲酸
鈀
奈米粒子
咪唑
石墨基材
Type
thesis
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