Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 216, Issue -, Pages 394-401Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2015.04.020
Keywords
Tungsten oxide; Thin film; Hydrogen gas sensor; Gasochromism; Sol-gel process
Ask authors/readers for more resources
High-performance hydrogen gas sensors are needed to ensure safe use of hydrogen gas as a clean energy resource. Pt catalyst-loaded tungsten oxide (Pt/WO3), which shows gasochromism, is an excellent candidate for optical hydrogen gas sensor applications. Pt/WO3 turns blue in a hydrogen gas atmosphere and its electrical conductivity also changes at the same time. This study investigated the influence of partial pressures of hydrogen and oxygen gases on the gasochromism of Pt/WO3. Using elementary gasochromic reactions as a basis, we estimated the concentration of hydrogen injected into a WO3 lattice from the equilibrium of elementary reaction velocities. The estimation suggested that the inverse of the hydrogen concentration in WO3 was inversely proportional to the partial pressure of hydrogen and was proportional to that of oxygen. Additionally, the estimation agreed well with the results of Pt/WO3 gasochromic properties. Therefore, we were able to confirm the dependence of gasochromism on the partial pressures of hydrogen and oxygen gases, and substantiate that Pt/WO3 is capable of detecting hydrogen gas concentrations in various atmosphere conditions where oxygen gas partial pressures change. (C) 2015 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available