A reversible and robust electrochemical pH oscillator was achieved using an ethyl viologen/ionic liquid (IL) aqueous solution under an applied redox potential in a batch reactor, where the IL incorporated into the pH oscillator increased the stability of the pH oscillation by acting as an electron buffer solution.
Shin, S., Lee, C., Kim, S., So, I., Spinks, G. Maxwell., Wallace, G. G. and Kim, S. (2008). Electrochemical pH Oscillations of Ethyl Viologen/Ionic Iquid. Langmuir: the ACS journal of surfaces and colloids, 24 3562-3565.