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One-step electrodeposition of carbon–silicate sponge assisted by a three-phase junction for efficient bioelectrocatalysis
|Katarzyna Szot 1, Martin Jönsson-Niedziółka 1, Barbara J. Palys 2, Joanna Niedziolka-Jönsson 1|
1. Polish Academy of Sciences, Institute of Physical Chemistry, Kasprzaka 44/52, Warszawa 01-224, Poland
Single-step electrodeposition of nanocomposite silicate materials based on hydrophilic carbon nanoparticles (CNPs) and a hydrophobic sol-gel precursor with the help of an electrode|organic-phase|aqueous-electrolyte three-phase junction is presented. A tin-doped indium oxide electrode is immersed into a cell filled with two immiscible liquids. The upper aqueous phase contains dispersed carbon nanoparticles in electrolyte and the bottom organic phase consists of sol-gel precursor in nitrobenzene. Applying a positive potential to the electrode results in generation of protons which act as catalyst for the sol-gel process [1,2]. This method leads to the formation of a narrow, sponge-like carbon–silicate stripe at the electrode surface close to the three-phase junction. To increase the active surface area several parallel stripes were deposited, however this resulted in the formation of a compact film between the stripes. The morphology and structure of the nanocomposites were thoroughly investigated by AFM, SEM, optical and infrared mapping. The electrodes were examined as a support for bilirubin oxidase — an enzyme showing bioelectrocatalytic activity towards dioxygen reduction.
Presentation: Short communication at SMCBS'2011 International Workshop, by Katarzyna Szot
See On-line Journal of SMCBS'2011 International Workshop
Submitted: 2011-09-02 11:08 Revised: 2011-09-02 11:08