Proton-Conducting Nanocrystalline Ceramics for High-Temperature Hydrogen Sensing
Tóm tắt
The proton-conductive doped ceramic materials, including SrCe0.95Tb0.05O3−δ
(SCTb), SrCe0.8Zr0.1Y0.1O3−δ
(SCZY), and SrZr0.95Y0.05O3−δ
(SZY), are synthesized in the forms of nanoparticles and nanocrystalline thin films on sapphire wafers and long-period grating (LPG) fibers. The H2 chemisorption and electrical conductivity of the nanocrystalline SCTb, SCZY, and SZY materials are measured at high temperature with and without the presence of CO2 gas. The resonant wavelength shifts (
$$ \Updelta \lambda_{{{\text{R,H}}_{ 2} }} $$
) of the SCTb, SCZY, and SZY thin-film coated LPGs in response to H2 concentration changes are studied in gas mixtures relevant to coal gasification syngas to evaluate their potential for high-temperature H2 detection. The results show that, at around 773.15 K (500 °C), SCTb has the highest H2 sensitivity but the most severe interferences from impurities such as CO2 and H2S; SZY has the best chemical resistance to impurities but the lowest H2 sensitivity; and SCZY exhibits high H2 sensitivity with reasonable chemical resistance.
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