论文信息 - Electrochemical NO2 gas sensors: Model and mechanism for the electroreduction of NO2

Electrochemical NO2 gas sensors: Model and mechanism for the electroreduction of NO2

Two types of sensing devices have been studied in order to elucidate the mechanism of response of amperometric gas sensors. A high-surface-area electrode (HSAE) sensor produces fast electrode reactions, and the steady-state sensor signals are controlled either by permeation or by the supply of analyte to the sensor. For low-surface-area electrode (LSAE) sensors, a kinetically controlled signal is observed. A mechanism that involves a “chemically” induced changes in the gold electrode surface oxide coverage is proposed, and the activation energy for NO2 reduction at a gold electrocatalyst is calculated. A general model of sensor response is proposed that can describe the behavior of the steady-state response for both HSAE and LSAE sensors.

Joseph R. Stetter | J. Stetter | Si-Chung Chang | Si-Chung Chang

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