title: CTAB-promoted prussian blue-modified electrode and its cation transport characteristics for K+, Na+, Li+, and NH4+ ions.
abstract: A Prussian blue (PB) film was deposited on a glassy carbon (GC) electrode by cyclic voltammetry in the presence of the cationic surfactant cetyltrimethylammonium bromide (CTAB). The electrode thus formed showed 4-fold enhancements in redox current and charge values in pure KCl electrolyte as well as greater stability than an electrode prepared in the absence of CTAB. This improved performance of a PB+CTAB electrode versus a PB electrode was further demonstrated using SEM, XRD, and electrochemical impedance spectroscopy (EIS) measurements. A comparative study was undertaken on the cation transport characteristics of PB and PB+CTAB electrodes for Na+, Li+, and NH4+ ions. We obtained a CV pattern for a CTAB-promoted PB film, which showed ideal Nernstian behavior at all scan rates from 5 to 140 mV s(-1). Conditions for the formation and preservation of these ideal and stable PB films are discussed. Possible mechanisms for the beneficial effects of CTAB are proposed.
authors.affiliation: Department of Chemistry, Korea University, Seoul, 136-713, Korea. javittal@yahoo.com
authors.forename: R
authors.initials: R
authors.lastname: Vittal
authors.forename: Kang-Jin
authors.initials: KJ
authors.lastname: Kim
authors.forename: H
authors.initials: H
authors.lastname: Gomathi
authors.forename: V
authors.initials: V
authors.lastname: Yegnaraman