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Preparation, Electrochemical Behavior and Electrocatalytic Activity of a Copper Hexacyanoferrate Modified Ceramic Carbon Electrode
Author(s) -
Yu Hao,
Zheng JianBin
Publication year - 2007
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200790094
Subject(s) - chemistry , chronoamperometry , charge transfer coefficient , amperometry , electrode , electrochemistry , electrocatalyst , inorganic chemistry , quinhydrone electrode , hydrazine (antidepressant) , reference electrode , carbon paste electrode , analytical chemistry (journal) , buffer solution , chemically modified electrode , working electrode , cyclic voltammetry , organic chemistry , chromatography
Abstract 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 ( α ) and charge transfer rate constant ( k s ) 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 ( k cat ). 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 mol·dm −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.