Electrochemical deposition and mechanism investigation of Prussian blue on graphic carbon paste electrode from an acidic ferricyanide solution |
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Authors: | Ya Ding Gang Gu Xing-Hua Xia |
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Institution: | (1) Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, 210093 Nanjing, China |
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Abstract: | Prussian blue (PB) films were electrochemically deposited on graphite carbon paste electrodes (GCPEs) from an acidic solution
of ferricyanide using the potentiodynamic and potentiostatic techniques. Interestingly, we, for the first time, observed that
on the surface of GCPE, the electrochemistry of PB films strongly depended on the deposition potential. A maximum formation
rate of PB was obtained at a more positive deposition potential (0.4 V vs saturated calomel electrode) on GCPE than that on
Au or Pt electrode. The ratio of peak current at ca 0.75 V to the one at 0.19 V varied with the deposition potential. In addition,
the electrocatalytic activity of the modified GCPEs towards the reduction of hydrogen peroxide considerably changed with the
formation potentials of the PB films. These phenomena can be due to the different formation mechanism of PB at different deposition
potentials.
Dedicated to Prof. Dr. Teresa Iwasita on the occasion of her 65th birthday in recognition of her numerous contributions to
interfacial electrochemistry. |
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Keywords: | Prussian blue Ferricyanide Electrodeposition Mechanism Surface chemistry |
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