121st General Meeting of the KCS

Type Poster Presentation
Area Electrochemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code ELEC.P-619
Subject Electrodeposited Iridium Oxide-Pt Black Microelectrode for Carbon Monoxide Detection
Authors Heesu Kim, Jae Ho Shin1,*, Sunguk Noh2, Jun Ho Shim2
Department of chemistry, Kwangwoon University, Korea
1Department of Chemistry, Kwangwoon University, Korea
2Department of Chemistry, Daegu University, Korea
Abstract Carbon monoxide (CO) which is naturally produced by the action of heme oxygenase in the human body, plays diverse physiological roles such as angiogenesis, immune response, and wound healing. The reliable in vivo detection of CO is essential to elucidate its numerous biological functions. However, the electrochemical measurement of CO has been challenging due to its low concentration, rapid diffusion, and severe interference from other electrochemically active species (e.g., nitric oxide, nitrite, ascorbic acid, and uric acid). In the CO sensor development, the elimination of NO interference is one of the important factors, because CO’s biological functions are closely related to NO’s ones. Indeed, the utility of a tin (Sn)-deposited Pt electrode (previously known as an amperometric CO sensor) has been hindered by significant interference from nitric oxide (NO). Herein we report on a novel amperometric CO sensor with superior sensitivity and selectivity via use of iridium oxide-Pt-black (IrOx-Pt-B) as an electrocatalyst for effectively oxidizing CO. IrOx-Pt-B are deposited on a Pt electrode by electrodeposition (i.e., cyclic voltammetry). The presence of the IrOx-Pt-B thin film not only greatly increases the active surface area, but also electrocatalyzes CO oxidation at a much lower electrode potential, 0.3 V (vs. Ag/AgCl). Moreover, this CO sensor significantly reduced NO interference by lowering the CO’s oxidation potential. In this study, the effect of the catalyst compositions (e.g., IrOx, Pt-B/IrOx, and IrOx-Pt-B) on sensor performance will be discussed. Furthermore the effect of electrodeposition conditions (e.g., scan rate and number of scan cycles) will be also evaluated.
E-mail heesu9292@naver.com