Study of Electrochemical Behavior of Gases in Ionic Liquids

Abstract

The electrochemical behavior of different gases performs divergently in different ionic liquids. The hydrogen and oxygen were selected as the target study gases in this article, the cyclic voltammetry and the chronoamperometry were applied to study and analyze the electrochemical behavior including response time and sensitivity of these gases in ionic liquids [Bmpy][NTf2] and [Bmim][NTf2] based electrochemical sensor, respectively. The results showed that: the sensitivity of H2 detection in [Bmpy][NTf2] and [Bmim][NTf2] are 4.93µA/% and 0.03 µA/%, respectively. Furthermore, the relationship between the current signal and concentration of H2 is linear; the sensitivity of O2 detection in [Bmpy][NTf2] and [Bmim][NTf2] are -0.055mA/% and -0.002mA/%, respectively. Furthermore, the relationship between the current signal and concentration of O2 is linear The research showed that gases tend to have better sensitivity and response ability in [Bmpy][NTf2] compared with [Bmim][NTf2]. This work optimized the better ionic liquid electrolyte and could provide both of the theoretical and mechanical support for further study on electrochemical gas sensors.