Hi gh performance metal oxide based sensing device using an electrode with a solid/liquid/air triphase interface
Zhang, J1,2，Sheng, X1，Jin, J2，Feng, XJ1，*（封心建），Jiang, L3
1 Soochow Univ, Coll Chem Chem Engn & Mat Sci, S uzhou 215123, Peoples R China
2 Chinese Acad Sci, Suzhou Inst Nanotech & Nanobion, Suzhou 215123, Peoples R China
3 Beihang Univ, Sch Chem & Environm, Beijing 100191, Peoples R China
NANO RESEARCH ,2017,10（9）,2998--3004
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.
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