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Ionic liquids as electrolytes for the development of a robust amperometric oxygen sensor.

Authors
Wang-Z; Lin-P; Baker-GA; Stetter-J; Zeng-X
Source
Anal Chem 2011 Sep; 83(18):7066-7073
NIOSHTIC No.
20040261
Abstract
A simple Clark-type online electrochemical cell design, consisting of a platinum gauze working electrode and incorporating ionic liquids (IL) as electrolytes, has been successfully applied for the amperometric sensing of oxygen. Studying ILs comprising the bis(trifluoromethylsulfonyl)imide anion, the obtained analytical parameters were found to be strongly dependent on the choice of cation. Compared with a conventional Clark cell design based on an aqueous supporting electrolyte, the modified oxygen sensor achieves substantial improvements in performance and stability. A limit of detection for oxygen as low as 0.05 vol%, linearity over an oxygen partial pressure between 0% and 20%, and a steady-state response time of 2 min was demonstrated, with a stable analytical response shown over the examined period of 90 days with no obvious fouling of the electrode surface. Based on the attractive physical attributes of ionic liquids (e.g., thermal stability beyond 150 C), one can envision intriguing utility in nonstandard conditions and long-term online applications, as well as extension to the determination of other gases, such as methane and nitric oxide.
Keywords
Analytical-chemistry; Analytical-instruments; Analytical-processes; Electrochemistry; Electrolytes; Electrolytic-analysis; Equipment-design; Equipment-reliability; Performance-capability; Detectors; Gas-detectors; Gas-indicators; Thermal-properties; Gases
Contact
Xiangqun Zeng, Department of Chemistry, Oakland University, Rochester, MI 48309, USA
CODEN
ANCHAM
CAS No.
7782-44-7
Publication Date
20110915
Document Type
Journal Article
Email Address
zeng@oakland.edu
Funding Type
Grant
Fiscal Year
2011
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R21-OH-009099; Grant-Number-R01-OH-009644
Issue of Publication
18
ISSN
0003-2700
Source Name
Analytical Chemistry
State
MI; MO; CA
Performing Organization
Oakland University, Rochester, Michigan
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