Preparation Of High Stability Proton Conductor And Study Of Hydrogen Permeability

High temperature proton conductor refers to the material with proton conduction ability in high temperature and hydrogen atmosphere,which is widely used in fuel cell,hydrogen separation,hydrogen sensor and other fields.Among them,Ba Ce O3,Ba Zr O3 and Ba Hf O3matrix subconductors have been extensively studied.The sintering property,electrical conductivity and chemical stability of these three proton conductor materials were systematically studied,and these materials were applied to hydrogen separation.BaHf_0.8-xIn_0.2Zn_xO_3-δsamples with different stoichiometric ratios were synthesized by solid state reaction method.The results show that Zn²⁺has been successfully mixed into the lattice of Ba Hf O3 to form a dense perovskite structure.When x=0.06,the sample has the largest proton concentration,the best sintering ability and conductivity,and the relative density reaches 96.09%.The total conductivity can reach 6.07×10^-3 S·cm^-1 at 700℃in wet air.It has good chemical stability in H₂O,CO₂,H₂,H₂S atmosphere and boiling water.The hydrogen permeability of it is 0.0381 m L·min^-1·cm^-2 at 900℃in 50%H₂/He atmosphere.The precursors of BaZr_0.5Fe_0.5O_3-δ were synthesized by solid-state reaction method.The samples of Ba Zr0.85Fe0.15O3-δ-Ba Zr0.15Fe0.85O3-δwere spontaneously generated by the pressed powder during the sintering process.The results show that the sample has formed a tightly arranged two-phase electrolyte,which has good sintering ability and protonation ability.The electrical conductivity of the sample can reach 3.72×10^-1 S cm^-1 at 700℃ in dry air.The sample has good chemical stability in H₂O,CO₂,H₂ and H₂S and boiling water.MCe_0.5Hf_0.3Y_0.1Yb_0.1O_3-δ（M=Sr,Ba）was synthesized by solid state reaction method.The results show that both samples form dense ceramic bodies with full particles,and all elements are evenly distributed on the surface and cross section of the samples.Ba Ce0.5Hf0.3Y0.1Yb0.1O3-δhas stronger protonated ability,larger proton concentration,and higher conductivity.The conductivity can reach 9.34×10^-3 S·cm^-1 in dry air at 700℃.Both samples have good chemical stability in H₂O,CO₂,H₂,H₂S and boiling water.Figure 47;Table 5;Reference 101...