Electrochemical oxygen pump using CeO2-based solid electrolyte for NOx detection independent of O2 concentration
✍ Scribed by T. Hibino; K. Ushiki; Y. Kuwahara
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 477 KB
- Volume
- 93
- Category
- Article
- ISSN
- 0167-2738
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✦ Synopsis
The electrochemical oxygen pump has been studied using Ceo,,Sm,.,O , .9 as a solid electrolyte and gold metal as an electrode. The 0, concentration in the flow of a mixture of 1000 ppm NO, l-10% O,, 5% H,O and 5% CO, at a flow-rate of 20 ml min-' was electrochemically controlled to a constant value of 5% by applying anodic or cathodic currents to the cell at 900°C. During oxygen pumping, NO was not electrolyzed at all and the pumping amount of oxygen obeyed Faraday's law. A potentiometic-or amperometric-type sensor for NOx, when introduced into the resulting gas stream, exhibited an output signal without influence of the 0, concentration.