High performance metal oxide based sensing device using an electrode with a solid/liquid/air triphase interface

摘要

The wetting properties of an electrode surface are of significant importance to the performance of electrochemical devices because electron transfer occurs at the electrode/electrolyte interface.Described in this paper is a low-cost metal oxide electrocatalyst (CuO)-based high-performance sensing device using an enzyme electrode with a solid/liquid/air triphase interface in which the oxygen level is constant and sufficiently high.We apply the sensing device to detect glucose,a model test analyte,and demonstrate a linear dynamic range up to 50 mM,which is about 25 times higher than that obtained using a traditional enzyme electrode with a solid/liquid diphase interface.Moreover,we show that sensing devices based on a triphase assaying interface are insensitive to the significant oxygen level fluctuation in the analyte solution.