High performance metal oxide based sensing device using an electrode with a solid/liquid/air triphase interface
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.
Keywordssuperhydrophobicity triphase interface metal oxide electrocatalyst sensing device
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This work is financially supported by the National Natural Science Foundation of China (No. 21371178), the Jiangsu Province Science Foundation for Distinguished Young Scholars (No. BK20150032), and the Chinese Thousand Youth Talents Program (No. YZBQF11001).
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