Electrooxidation of hexacyanoferrate(II) anions and electroreduction of oxygen in the microfabricated electrochemical sensor-array system

K. Pitman, J. Nerut, E. Lust, S. Franssila, M. Raud, T. Kikas

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

3 Citations (Scopus)

Abstract

The microfabrication technique was used to prepare a six-channel sensor-array chip. The sensor-array has been fabricated using borosilicate wafer containing Pt electrodes and connection pads and the silicon wafer with through holes, which were bonded with SU-8 using adhesion bonding method. To characterize the prepared sensor-array chips the cyclic voltammetry and electrochemical impedance experiments were carried out in a three-electrode electrochemical system. The electrooxidation of ferrocyanide and electroreduction of oxygen were studied. It was shown that the measured current density depends on the electrode potential sweep rate however, both linear and radial diffusion mass transfer components are important at high electrode potential scanning rate. The pseudo steady-state conditions were achieved at slow potential sweep rates (>0.01 Vs-1) and the electrodes behaved as the microelectrodes. The pseudo steady-state current density is proportional to the concentration of electroactive species. The recessed microdisc electrode model has been used to describe the system.

Original languageEnglish
Title of host publicationSelected Proceedings from the 231st ECS Meeting New Orleans, LA - Spring 2017
PublisherThe Electrochemical Society
Pages1771-1782
Number of pages12
ISBN (Electronic)9781607685395
DOIs
Publication statusPublished - 2017
MoE publication typeA4 Article in a conference publication
EventElectrochemical Society Meeting - New Orleans, United States
Duration: 28 May 20172 Jun 2017
Conference number: 231
http://www.electrochem.org/231

Publication series

NameECS Transactions
PublisherThe Electrochemical Society Inc.
Number11
Volume77
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Conference

ConferenceElectrochemical Society Meeting
Abbreviated titleECS
CountryUnited States
CityNew Orleans
Period28/05/201702/06/2017
Internet address

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