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Citation: SHI Yan-Mao, WU Ping, DU Pan, CAI Chen-Xin. Solid-state Electrochemistry of Gadolinium Hexacyanoferrate Modified Electrode and Its Electrocatalytic Property[J]. Acta Physico-Chimica Sinica, ;2006, 22(10): 1227-1232. doi: 10.1016/S1872-1508(06)60057-0 shu

Solid-state Electrochemistry of Gadolinium Hexacyanoferrate Modified Electrode and Its Electrocatalytic Property

1.
Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Chemistry and Environmental Science, Nanjing Normal University, Nanjing 210097, P. R. China

Received Date: 3 April 2006
Available Online: 11 October 2006

A new electroactive polynuclear inorganic compound of rare earth metal, gadolinium hexacyanoferrate (GdHCF), was prepared and characterized using the techniques of FTIR spectroscopy, thermogravimetric analysis (TGA), UV-Vis spectrometry, X-ray photoelectron spectroscopy (XPS), ICP atomic emission spectoscopy, and EDX. The results of ICP atomic emission spectroscopy, EDX, and TGA indicated that the prepared GdHCF sample had a stoichiometry of NaGdFe(CN)6•12H2O (when GdHCF was prepared in NaCl solution). The FTIR spectrum of GdHCF showed that there were two types of water molecules in the structure of GdHCF: one was the interstitial water (5 H2O), which resulted from the association of water due to H-bonding, and the other was water coordinated with Gd (7 H2O). The results obtained using XPS showed that the oxidation state of Fe and Gd in the GdHCF sample was +2 and +3, respectively. GdHCF was immobilized on the surface of spectroscopically pure graphite (SG) electrode forming the GdHCF/SG electrode, and the solid-state electrochemistry of the resultant electrode was studied using cyclic voltammetry. The cyclic voltammetric results indicated that the GdHCF/SG electrode exhibited a pair of welldefined and stable redox peaks with the formal potential of E0′=(197±3) mV. The effects of the concentration of the supporting electrolyte on the electrochemical characteristics of GdHCF were studied, and the results showed that the value of E0′ increased linearly with the activity of the cationic ion of the supporting electrolyte (lgaNa+), with a slope of 54.1 mV, which may become a novel method for determining the activity of Na+ in solution. Further experimental results indicated that GdHCF had electrocatalytic activities toward the oxidation of dopamine (DA), and ascorbic acid (AA), and the electro- catalytic current increased linearly with the concentration of DA (or AA) in the range of 1.0~10.0 mmol•L−1 (for DA) or 0.5~20.0 mmol•L−1 (for AA).
- Solid-state electrochemistry;Chemically modified electrode;Gadolinium hexacyanoferrate;Electrocatalysis
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