Sensitivity and Selectivity of SnO2-Based Sensor for CO and H2 Detections: A Novel Method to Detect Simultaneously the CO and H2 Concentrations

ISSN 1121-7588

Xing-Min Guo¹, Jie-Ting Zhao^1.2, Xi-Tao Yin^1.3, Shuang-Long Huang¹
¹School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
²School of Mechanical Engineering, Changchun Normal University, Changchun, China
³School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan 114051, China

Abstract

SnO₂-based sensor has many advantages such as low cost, small size, high reliability, and long operating life, but selectivity has been a major obstacle on the application for discriminating gas species in mixture of multi-reduction gases. To resolve the problem in this work, the pure SnO₂ and NiO-, CuO- and Pt-modifying SnO₂ as sensing materials were prepared by sol-gel method, the sensor cells were fabricated and characteristics of sensitivity and selectivity of the sensor cells to CO and H₂ at 400oC were investigated. The results showed that the response of CO was improved obviously by doping 20mol%NiO or 5mol%CuO into the SnO₂, while the response of H₂ was changed no more, and the responses of CO and H₂ both were enhanced dramatically by bearing 1mol%Pt into the SnO₂. On the basis of empirical equation (R=1+kCn), two sensor cells with different selectivity were introduced to assemble a novel SnO₂-based sensor, and proposed a potential method to detect the concentrations of CO and H₂ in multi-component gases, in which the parameters of k and n for sensor cells were obtained and feasibility of the method was demonstrated.

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