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Electrochim Acta

Title:		"Electrode Reactions Coupled with Chemical Reactions of Oxygen, Water and Acetaldehyde in an Ionic Liquid: New Approaches for Sensing Volatile Organic Compounds"
Author(s):		Chi X; Tang Y; Zeng X;
Address:		"Department of Chemistry, Oakland University, Rochester, Michigan 48309, United States"
Journal Title:		Electrochim Acta
Year:		2016
Volume:		20160831
Issue:
Page Number:		171 - 180
DOI:		10.1016/j.electacta.2016.08.108
ISSN/ISBN:		0013-4686 (Print) 0013-4686 (Linking)
Abstract:		"Water and oxygen are ubiquitous present in ambient conditions. This work studies the unique oxygen, trace water and a volatile organic compound (VOC) acetaldehyde redox chemistry in a hydrophobic and aprotic ionic liquid (IL), 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide ([Bmpy] [NTf(2)]) by cyclic voltammetry and potential step methods. One electron oxygen reduction leads to superoxide radical formation in the IL. Trace water in the IL acts as a protic species that reacts with the superoxide radical. Acetaldehyde is a stronger protic species than water for reacting with the superoxide radical. The presence of trace water in the IL was also demonstrated to facilitate the electro-oxidation of acetaldehyde, with similar mechanism to that in the aqueous solutions. A multiple-step coupling reaction mechanism between water, superoxide radical and acetaldehyde has been described. The unique characteristics of redox chemistry of acetaldehyde in [Bmpy][NTf(2)] in the presence of oxygen and trace water can be controlled by electrochemical potentials. By controlling the electrode potential windows, several methods including cyclic voltammetry, potential step methods (single-potential, double-potential and triple-potential step methods) were established for the quantification of acetaldehyde. Instead of treating water and oxygen as frustrating interferents to ILs, we found that oxygen and trace water chemistry in [Bmpy][NTf(2)] can be utilized to develop innovative electrochemical methods for electroanalysis of acetaldehyde"
Keywords:		Ionic liquid acetaldehyde electrochemical gas sensors oxygen reduction water;
Notes:		"PubMed-not-MEDLINEChi, Xiaowei Tang, Yongan Zeng, Xiangqun eng R01 ES022302/ES/NIEHS NIH HHS/ 2017/11/17 Electrochim Acta. 2016 Oct 20; 216:171-180. doi: 10.1016/j.electacta.2016.08.108. Epub 2016 Aug 31"