Characterization of iron hexachloroplatinate films and their electrocatalytic properties with NAD+, hemoglobin and O2

Iron hexachloroplatinate (FePtCl6) films have been prepared by mixing Fe (2+) and PtCl62- ions in an aqueous KBr solution. The electrochemical quartz crystal microbalance (EQCM), rotating ring-disk electrode, UV-visible absorption spectroscopy, stopped-flow kinetic method and cyclic voltammetry were used to study the deposition and growth mechanism of the iron hexachloroplatinate films. The electrochemical and EQCM properties of the films indicated that a single redox process was confined to the immobilized iron hexachloroplatinate films. The deposition of an iron hexabromoplatinate film occurred when was electrochemically reduced to (PtCl64-)-Cl-II and Fe3+ to Fe2+. In the aqueous KCl, pH 3.0, solution, (PtCl-62-)-Cl-IV was electrochemically reduced to (PtCl64-)-Cl-II and the Fe (2+) reacted with the (PtCl-64-)-Cl-11 and (PtCl-62-)-Cl-IV species. The electrocatalytic reduction properties of NAD(+) and hemoglobin were determined using the iron hexachloroplatinate films. The electrocatalytic and electrochemical reactions of NAD(+) with an iron hexabromoplatinate film were investigated using the rotating ring-disk electrode method. The catalytic current increased with the increase of analyte concentration with slope of 1.6 mu A/mM. (c) 2005 Elsevier B.V. All rights reserved.