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Sensors 2017, 17(12), 2759;

A New Low-Temperature Electrochemical Hydrocarbon and NOx Sensor

Nanomaterials and Sensors Laboratory, School of Engineering and Computer Science, Washington State University Vancouver, Vancouver, WA 98686, USA
Joint School of Nanoscience and Nanoengineering, North Carolina A & T State University, Greensboro, NC 27401, USA
Faculty of Engineering, Yamagata University, Yonezawa, Yamagata 992-8510, Japan
Author to whom correspondence should be addressed.
Received: 22 October 2017 / Revised: 14 November 2017 / Accepted: 27 November 2017 / Published: 29 November 2017
(This article belongs to the Special Issue Air Pollution Sensors: A New Class of Tools to Measure Air Quality)
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In this article, a new investigation on a low-temperature electrochemical hydrocarbon and NOx sensor is presented. Based on the mixed-potential-based sensing scheme, the sensor is constructed using platinum and metal oxide electrodes, along with an Yttria-Stabilized Zirconia (YSZ)/Strontium Titanate (SrTiO3) thin-film electrolyte. Unlike traditional mixed-potential sensors which operate at higher temperatures (>400 °C), this potentiometric sensor operates at 200 °C with dominant hydrocarbon (HC) and NOx response in the open-circuit and biased modes, respectively. The possible low-temperature operation of the sensor is speculated to be primarily due to the enhanced oxygen ion conductivity of the electrolyte, which may be attributed to the space charge effect, epitaxial strain, and atomic reconstruction at the interface of the YSZ/STO thin film. The response and recovery time for the NOx sensor are found to be 7 s and 8 s, respectively. The sensor exhibited stable response even after 120 days of testing, with an 11.4% decrease in HC response and a 3.3% decrease in NOx response. View Full-Text
Keywords: electrochemical; YSZ; STO; oxygen ion conductivity; NOx; hydrocarbon electrochemical; YSZ; STO; oxygen ion conductivity; NOx; hydrocarbon

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Sekhar, P.K.; Moore, Z.; Aravamudhan, S.; Khosla, A. A New Low-Temperature Electrochemical Hydrocarbon and NOx Sensor. Sensors 2017, 17, 2759.

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