Updated in 12/28/2009 9:21:07 PM      Viewed: 159 times      (Journal Article)
The journal of physical chemistry. B 112 (4): 1149-56 (2008)

CTAB-promoted prussian blue-modified electrode and its cation transport characteristics for K+, Na+, Li+, and NH4+ ions.

R Vittal , Kang-Jin Kim , H Gomathi , V Yegnaraman
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.
DOI: 10.1021/jp074994s      ISSN: 1520-6106