Limiting current oxygen sensor based on Y, In co-doped SrTiO3 as a dense diffusion barrier layer
Ke Shan, Zhongzhou Yi, Jing Wang
Abstract
A novel dense diffusion barrier material (Y x Sr 1− x Ti 0.9 In 0.1 O 3− δ ( x = 0.03, 0.05, 0.07)) was prepared by using a sol-gel method. The crystal structure, microstructures, electrical conductivity and ionic conductivity of barrier material were characterized. The results show that the samples exhibit the formation of cubic perovskite structure phase. The increase of Y-doping amount on A-site improved electrical conductivity and sinterability of materials. A limiting current oxygen sensor based on Y 0.07 Sr 0.97 Ti 0.9 In 0.1 O 3− δ as a dense diffusion barrier shows excellent sensing performance. The linear relationship between limiting current log I L and 1000/ T can described log I L = 4.6038 − 3.8475·1000/ T . At 750 °C, 0.25% ≤ x (O 2 ) ≤ 5.0%, the linear relationship between limiting current ( I L ) and oxygen amount ( x (O 2 )) can described as I L = 7.0476 + 3.8751 x (O 2 ).