Solid Electrolyte CO2 Sensor Using Binary Carbonate Electrode

Abstract

A simple potentiometric CO2 sensor based upon a Na+-conducting solid electrolyte (NASICON) was found to be greatly improved in response time and water vapor-resistance by using a binary carbonate electrode of BaCO3–Na2CO3. For a wide range of CO2 concentration from 4 to 400000 ppm, the electromotive force examined at 823 K followed a Nernst’s equation excellently, with a 90% response time of as short as 8 s. Water vapor hardly affected the sensor characteristics, in contrast to the case of a pure Na2CO3 electrode.

Study on the Characteristics of Ag Doped CuO-BaTiO3 CO2 Sensors

“…A simple and cheap method of CO 2 detection is thus needed. Potential methods for CO 2 detection are gas sensors based on measuring potentiometric [1][2][3][4][5][6][7][8][9][10][11][12] or amperometric [13] responses, or measuring capacitance [14,15] or resistance change [16].…”

Gas Sensors for Monitoring Air Pollution

“…CO 2 sensing properties can be upgraded with auxiliary phases in sensing electrodes, which are binary carbonate systems such as Na 2 CO 3 -BaCO 3 , Na 2 CO 3 -CaCO 3 , Li 2 CO 3 -BaCO 3 , and Li 2 CO 3 -CaCO 3 . The binary systems bring about several advantages such as better long-term stability, quick response time, and resistance to water vapor interruption [18,40,[51][52][53][54]. The device improved in this way has much increased feasibility in practice [55].…”

Miniaturized Amperometric Solid Electrolyte Carbon Dioxide Sensors

“…Na 2 CO 3 is the real auxiliary electrolyte whereas BaCO 3 is used to reduce possible effects of humidity [3]. This was the first time to our knowledge that two material systems were deposited on the interdigitated finger electrodes distinctively with both electrolyte systems (NASICON and Na 2 CO 3 /BaCO 3 ) contacting the electrodes.…”

“…The general sensing mechanism is as follows [3] This sensing mechanism implies that the sensor operating temperature is high enough to allow the flow of Na through the electrolyte. The same sensor structure could also be applied to develop NO x sensors with the corresponding auxiliary electrolytes NaNO 2 or NaNO 3 [11].…”