Electrochemical detection of volatile organic compounds using a Na3Zr2Si2PO12/Bi2Cu0.1V0.9O5.35 heterojunction device

CO-sensing properties of a NASICON-based gas sensor attached with Pt mixed with Bi2O3 as a sensing electrode

“…Several reports concluded that the response of the mixed-potential type sensors can be generated at the equal magnitude of the cathodic current to the anodic one under the conditions of the occurrence of more than two reactions, i.e. electrochemical reduction and oxidation of chemicals including a target gas [8,19,20].…”

“…It is well-known that solid-electrolyte gas sensors generally show negative EMF responses to reducing gases, such as CO, H 2 and various inflammable gases [8,12] 14, and the EMF response of the sensor to 300 ppm CO in dry air was investigated, while the counter electrode was constantly exposed to a reference dry air [8]. In fabricating the sensor, an We also speculate the sensing mechanism of the present sensor can also be explained by the mixed-potential theory.…”

“…For example, Obata et al have demonstrated that a NASICON-based gas sensor using NaNO 2 -Li 2 CO 3 mixed with ITO powders as a sensing electrode material showed stable response to NO 2 without interference of humidity even at RT and the response to NO 2 was proportional to the logarithm of NO 2 concentration [18]. Kida et al reported that a NASICON-based gas sensor using Bi 2 Cu 0.1 V 0.9 O 5.35 as an electrode material could detect VOCs such as ethanol, formaldehyde and toluene [8]. Lu et al have reported that a NASICON-based gas sensor using Cr 2 O 3 as a sensing-electrode material showed the high sensitivity to Cl 2 at 300˚C [20].…”

“…Among them, the solid-electrolyte gas sensors have advantages, since they can detect some kinds of gases selectively and sensitively, by optimization of the composition and microstructure of the gas-sensing electrodes as well as the electrolyte. NASICON (Na 3 Zr 2 Si 2 PO 12 ) is well-known as a promising electrolyte which shows relatively high ionic conductivity at low temperatures (e.g., 5.2×10 -2 S m -1 at RT [24]), and thus many efforts have recently directed to developing the NASICON-based gas sensors which can detect various gases, such as SO 2 [13], CO 2 [14][15][16], NO 2 [17,18], VOCs, [8], NH 3 [19] and Cl 2 [20]. For example, Obata et al have demonstrated that a NASICON-based gas sensor using NaNO 2 -Li 2 CO 3 mixed with ITO powders as a sensing electrode material showed stable response to NO 2 without interference of humidity even at RT and the response to NO 2 was proportional to the logarithm of NO 2 concentration [18].…”

“…Various types of gas sensors (e.g., semiconductor type [1,2], diode type [3][4][5], catalytic-combustion type [6] and solid-electrolyte type [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]) have been widely investigated and developed to detect various gases such as volatile organic compounds (VOCs) [7,8], carbon monoxide (CO) [1,2,6,9,10] and hydrogen (H 2 ) [5,11,12] under different atmospheres. They have contributed to forestall various serious troubles to human beings, such as sick building syndrome (for VOC), difficulty of breathing (for CO) and explosion accidents (for H 2 ).…”