摘要：

A novel composite electrode coating based on a mixture of cobalt phthalocyanine and Nafion is described. The resulting film has better properties than either of the two components alone, resulting in several potential-sensing applications. In particular, it exhibits electrocatalytic, preconcentration and permselectivity properties simultaneously. For example, effective differentiation between compounds undergoing electrocatalysis, based on their characteristic charge, is illustrated. Enhanced sensitivity is achieved simultaneously for solutes undergoing electrocatalysis or electrostatic binding. Cyclic voltammetry and rotating disk experiments are employed to characterize the catalytic, loading and transport characteristics. Factors determining the film's performance are explored. The practical analytical utility is illustrated by selective flow-injection measurements of hydrazine or hydrogen peroxide in the presence of oxalic or ascorbic acids, respectively. Low detection limits ( e.g., 5.7 ng of hydrazine) are obtained.

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