title: Electrocatalytic oxidation of cellulose at a gold electrode.
abstract: The electrochemical properties of cellulose dissolved in NaOH solution at a Au surface were investigated by cyclic voltammetry, FTIR spectroscopy, the electrochemical quartz crystal microbalance technique, and electrochemical impedance spectroscopy. The reaction products were characterized by SEM, TEM, and FTIR and NMR spectroscopy. The results imply that cellulose is irreversibly oxidized. Adsorption and desorption of hydroxide ions at the Au surface during potential cycling have an important catalytic role in the reaction (e.g., approach of cellulose to the electrode surface, electron transfer, adsorption/desorption of the reaction species at the electrode surface). Moreover, two types of cellulose derivatives were obtained as products. One is a water-soluble cellulose derivative in which some hydroxyl groups are oxidized to carboxylic groups. The other derivative is a water-insoluble hybrid material composed of cellulose and Au nanoparticles (≈4 nm). Furthermore, a reaction scheme of the electrocatalytic oxidation of cellulose at a gold electrode in a basic medium is proposed.
authors.affiliation: Analytical Chemistry, Process Chemistry Centre, Åbo Akademi University, Biskopsgatan 8, FI-20500 Turku (Finland).
authors.forename: Yasuhito
authors.initials: Y
authors.lastname: Sugano
authors.forename: Rose-Marie
authors.initials: RM
authors.lastname: Latonen
authors.forename: Marceline
authors.initials: M
authors.lastname: Akieh-Pirkanniemi
authors.forename: Johan
authors.initials: J
authors.lastname: Bobacka
authors.forename: Ari
authors.initials: A
authors.lastname: Ivaska
mesh_terms: D002384:Catalysis; D002482:Cellulose / Q000737:chemistry*; D004563:Electrochemistry / Q000295:instrumentation*; D004566:Electrodes; D006046:Gold / Q000737:chemistry*; D010084:Oxidation-Reduction; D012972:Sodium Hydroxide / Q000737:chemistry
chemical_list: D012972:Sodium Hydroxide; D006046:Gold; D002482:Cellulose
keywords: biomass; electrochemistry; gold; nanoparticles; oxidation