We investigated the stability of a NASICON (Na3Zr 2Si2PO12)-based potentiometric CO2 sensor fitted with a composite of BiCuVOx (Bi2Cu0.1V 0.9O5.35) and perovskite-type-oxide (La 0.6Sr0.4Co0.78Ni0.02Fe 0.2O3) as a solid-reference electrode. The sensor showed stable electromotive force (EMF) responses to changes in CO2 concentration (400-2000 ppm) at 400 °C in high humid air (100% RH at 45 °C). Notably, no significant fluctuation in the potential of the solidreference electrode was observed even after the sensor device was kept under high humid conditions at room temperature for a long period (1-2 days). SEM (scanning electron spectroscopy)-EDX (energy dispersive X-ray spectroscopy) analysis revealed the presence of a thick interfacial layer between NASICON and the solid-reference electrode that may prevent NASICON from reacting with water and CO2.
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering