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6CCVD Research

Electrochemical Properties of Conventional and Unmodified Electrodes

At a Glance

Section titled ā€œAt a Glanceā€
MetadataDetails
Publication Date2020-01-20
JournalAaltodoc (Aalto University)
AuthorsPasi Tauriainen

Abstract

Section titled ā€œAbstractā€

Modified electrodes that utilize different nanomaterials are nowadays widely used and researched. The basis for the development of a modified electrode material is the knowledge of the electrochemical properties of the unmodified substrate. This reference point is needed in assessing the effects of the modification. This thesis work investigates the electrochemical properties of conventional and unmodified substrate materials.
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\nIn this work, a literature review was conducted on the key electrochemical properties of 12 conventional electrode materials. The selected materials include platinum, gold and different carbon allotropes, which are widely researched in biosensing applications. Materials can be examined e.g. by using cyclic voltammetry and various redox molecules. The six redox molecules of interest consist of three outer- and inner-sphere analytes. The electrochemical properties under investigation were water window, double layer capacitance, heterogeneous electron transfer rate constant, limit of detection for dopamine, redox potential differences in aqueous solutions and oxidation potential of ascorbic acid.
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\nThe review provided information on the recently found fast electron transfer (ET) kinetics of basal plane highly ordered pyrolytic graphite (HOPG) especially for outer-sphere molecules. The heterogeneous electron transfer rate constant suggests that the traditional role of the electronic density of states (DOS) level in the ET kinetics has to be reviewed. Also the wide variety of properties of carbon allotropes compared to the metals became evidently clear. Carbon allotropes can also provide significantly lower limits of detection for dopamine than metals due to their low background currents. The widest water window and inertness of boron doped diamond (BDD) provides interesting opportunities for electrode development.

Tech Support

Section titled ā€œTech Supportā€

Original Source

Section titled ā€œOriginal Sourceā€

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