Journal article
Impedance spectroscopy based characterization of an electrochemical propylene sensor
Sensors and actuators. B, Chemical, Vol.177, pp.111-115
02/2013
Handle:
https://hdl.handle.net/2376/105703
Abstract
In this investigation, an electrochemical mixed potential type gas sensor was characterized using impedance spectroscopy. Specifically, the effect of operating temperature (435–610°C) on sensor response and response time was studied. Propylene was used as the analyte to test the ‘La0.8Sr0.2CrO3/YSZ/Pt’ sensor configuration. Two-electrode AC impedance measurement was performed with a frequency sweep from 13MHz down to 10mHz and excitation voltage of 10mV.
For a fixed propylene concentration, the bulk and interfacial resistances was seen to decrease with increase in the sensor operating temperature. An Arrhenius behavior of the bulk and interfacial resistance was observed. The activation energy for O2 ion conduction and charge transfer was found to be 0.94eV and 1.54eV respectively. For a 150°C rise in operating temperature from 485 to 585°C, a 26-fold improvement in response rise time was observed while an 82% reduction in sensor response was recorded. It is postulated that the increase in operating temperature results in faster reaction kinetics, faster oxygen reduction and greater heterogeneous catalysis.
Metrics
10 Record Views
Details
- Title
- Impedance spectroscopy based characterization of an electrochemical propylene sensor
- Creators
- Praveen K Sekhar - Nanomaterials and Sensors Laboratory, School of Engineering and Computer Science, Washington State University Vancouver, Vancouver, WA 98686, United StatesHamid Sarraf - Nanomaterials and Sensors Laboratory, School of Engineering and Computer Science, Washington State University Vancouver, Vancouver, WA 98686, United StatesHanna Mekonen - Nanomaterials and Sensors Laboratory, School of Engineering and Computer Science, Washington State University Vancouver, Vancouver, WA 98686, United StatesRangachary Mukundan - Los Alamos National Laboratory, Sensors and Electrochemical Devices Group, Los Alamos, NM 87545, United StatesEric. L Brosha - Los Alamos National Laboratory, Sensors and Electrochemical Devices Group, Los Alamos, NM 87545, United StatesFernando H Garzon - Los Alamos National Laboratory, Sensors and Electrochemical Devices Group, Los Alamos, NM 87545, United States
- Publication Details
- Sensors and actuators. B, Chemical, Vol.177, pp.111-115
- Academic Unit
- Engineering and Computer Science (VANC), School of
- Publisher
- Elsevier B.V
- Identifiers
- 99900547064601842
- Language
- English
- Resource Type
- Journal article