Pengoksidaan elektrokimia gliserol secara elektrokimia menggunakan elektrod emas

Translated title of the contribution: Electrochemical oxidation of glycerol using gold electrode

Mohamed Rozali Othman, Amirah Ahmad

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Cyclic voltammetry, potential linear V and chronocuolometry methods were carried out to gain electrochemical behavior of glycerol at a gold electrode. Potassium hydroxide and sulfuric acid were chosen to be the electrolyte for the electro-oxidation of this organic compound. Besides gold plate electrode, gold composite electrode (Au-PVC) was also used as the working electrode. The Au-PVC composite electrode was characterized by Scanning Electron Microscopy (SEM) to determine its morphological aspects before and after used in electrochemical oxidation of glycerol. In alkaline solution, the adsorption of hydroxide species onto the surface of both gold plate and composite Au-PVC electrodes occurs at potential around 500 mV vs SCE. However, at gold plate electrode, there was a small, broad peak before the drastic escalation of current densities which indicates the charge transfer of the chemisorbed OH - anion. In acidic media, the gold oxide was formed after potential 1.0 V. From the cyclic voltammogram glycerol undergo oxidation twice in potassium hydroxide at gold plate and Au-PVC composite electrodes, while in sulfuric acid, oxidation reaction happened once for glycerol on the gold plate electrode. Overall, electrochemical oxidation of glycerol was more effective in alkaline media. Tafel graph which plotted from potential linear V method shows that Au-PVC composite electrode is better than gold plate electrode for the electro-oxidation of glycerol in alkaline solution. Electrochemical oxidation of glycerol products as analyzed by Gas Chromatography-Mass Spectrometry (GC-MS) produced several carboxylic acids and phenolic compounds.

Original languageMalay
Pages (from-to)291-299
Number of pages9
JournalMalaysian Journal of Analytical Sciences
Volume19
Issue number2
Publication statusPublished - 2015

Fingerprint

Electrochemical oxidation
Gold
Glycerol
Electrodes
Polyvinyl Chloride
Composite materials
Electrooxidation
Oxidation
Carboxylic Acids
Organic compounds
Gas chromatography
Oxides
Electrolytes
Cyclic voltammetry
Anions
Mass spectrometry
Charge transfer
Current density
Adsorption

Keywords

  • Carboxylic acid
  • Electrochemical oxidation
  • Glycerol
  • Phenolic compounds

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

Pengoksidaan elektrokimia gliserol secara elektrokimia menggunakan elektrod emas. / Othman, Mohamed Rozali; Ahmad, Amirah.

In: Malaysian Journal of Analytical Sciences, Vol. 19, No. 2, 2015, p. 291-299.

Research output: Contribution to journalArticle

Othman, Mohamed Rozali ; Ahmad, Amirah. / Pengoksidaan elektrokimia gliserol secara elektrokimia menggunakan elektrod emas. In: Malaysian Journal of Analytical Sciences. 2015 ; Vol. 19, No. 2. pp. 291-299.
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