Electrochemical deposition of gold nanoparticles on a glassy carbon electrode modified with sulfanilic acid

Tai Hsuan Lin*, Wei Hsiu Hung

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

14 引文 斯高帕斯(Scopus)

摘要

A glassy carbon (GC) electrode was covalently grafted with a layer of sulfanilic acid (SAA) via the formation of amine cation radicals under electro-oxidation. The surface compositions of the resulting electrode were characterized with X-ray photoelectron spectra. The electron transfer of Fe (CN) 6 3-4- to the SAA-modified GC (SAA/GC) electrode in solutions at varied pH was studied with cyclic voltammetry (CV) and analysis of electrochemical impedance. The electrodeposition of gold nanoparticles (AuNP) on the SAA/GC electrode exhibited a dependence on the solution pH, which is attributed to a variation of the terminal charge state of the grafted SAA. The modification of the GC surface with grafted SAA resulted in an enhanced electrodeposition of AuNP. The catalytic activities of AuNP/GC and AuNP/SAA/GC electrodes for reduction of oxygen are compared in phosphate buffer solution with CV. Two distinct reduction features are observed and attributed to a two-step, four-electron reduction of O2 to H2 O through intermediate H2 O2. The reduction signals of O2 on the AuNP/SAA/GC electrode exhibit a shift toward a positive potential, relative to those observed on the AuNP/GC electrode. This indicates that the AuNP on the SAA/GC electrode exhibits an increased catalytic activity for the reduction of oxygen.

原文英語
頁(從 - 到)D45-D50
期刊Journal of the Electrochemical Society
156
發行號2
DOIs
出版狀態已發佈 - 2009 一月 1

ASJC Scopus subject areas

  • 電子、光磁材料
  • 可再生能源、永續發展與環境
  • 表面、塗料和薄膜
  • 電化學
  • 材料化學

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