Preparation, Electrochemical Behavior and Electrocatalytic Activity of a Copper Hexacyanoferrate Modified Ceramic Carbon Electrode

• Published in: Chinese journal of chemistry Vol. 25; no. 4; pp. 503 - 509
• Main Author: 于浩 郑建斌
• Format: Journal Article
• Language: English
• Published: Weinheim WILEY-VCH Verlag 01.04.2007; WILEY‐VCH Verlag
• Subjects: amperometry; ceramic carbon electrode; chronoamperometry; copper hexacyanoferrate; electrocatalytic oxidation; hydrazine; 电催化活性; 电化学性质; 铁氰化铜修饰; 陶瓷碳电极
• ISSN: 1001-604X; 1614-7065
• DOI: 10.1002/cjoc.200790094

A copper hexacyanoferrate modified ceramic carbon electrode （CuHCF/CCE） had been prepared by two-step sol-gel technique and characterized using electrochemical methods. The resulting modified electrode showed a pair of well-defined surface waves in the potential range of 0.40 to 1.0 V with the formal potential of 0.682 V （vs. SCE） in 0.050 mol·dm^-3 HOAc-NaOAc buffer containing 0.30 mol·dm^-3 KCl. The charge transfer coefficient （a） and charge transfer rate constant （ks） for the modified electrode were calculated. The electrocatalytic activity of this modified electrode to hydrazine was also investigated, and chronoamperometry was exploited to conveniently determine the diffusion coefficient （D） of hydrazine in solution and the catalytic rate constant （kcat）. Finally, hydrazine was determined with amperometry using the resulting modified electrode. The calibration plot for hydrazine determination was linear in 3.0 × 10^-6--7.5 × 10^-4 mol·dm^-3 with the detection limit of 8.0 × 10^-7 molodm^-3. This modified electrode had some advantages over the modified film electrodes constructed by the conventional methods, such as renewable surface, good long-term stability, excellent catalytic activity and short response time to hydrazine.