The Preparation And Property Of CaB_1-xM_xO_3-??B=Zr?Hf;M=In?Sc??SrCe_0.9Y_0.1O_3-??Ba₃Ca_1.18Nb_1.82O_9-?Proton Conductors

High temperature proton conductor material exhibits proton conductivity at high temperatures.It is a kind of functional material with wide application prospect,which can be used in fuel cell,sensor,synthetic ammonia,nuclear industry and so on.There are many kinds of proton conductor.Its performance has its own characteristics.At present,there is no proton conductor material with high proton transfer number and high electric conductivity,which limits the further application of proton conductors.Therefore,according to the structure and electrical conductivity of proton conductors,a novel proton conductor material CaHf_1-xSc_xO_3-?,which has high proton transfer number and high conductivity,is proposed.This paper was prepared different doping amount of CaHf_1-xSc_xO_3-?,exploring to study the phase composition,conductivity,conductivity activation energy,proton transport number and other properties.CaZr_0.9ln_0.1O_3-?,CaZr_0.9Sc_0.1O_3-?,Ba₃Ca_1.18Nb₍1.82_O9-?,SrCe0.9Y0.1O₃ were prepared,and the properties of these materials were compared.The development of the new type of proton conductor provides the theoretical basis and the experimental exploration.It provides experimental data for the application of the new proton conductor.It has important scientific significance and practical value.The main achievements of this work are following:1.This paper proposed to develop a new proton conductor material,CaHf_1-xSc_xO_3-?.It was prepared by solid-phase synthesis,Doping content of CaHf_1-xSc_xO_3-?.s:x=0,x=0.1,x=0.2,x=0.3.XRD analysis showed that the calcination conditions were 1100?,10h.2.The results of electrochemical impedance spectroscopy show that the electrical conductivity,CaHf_1-xSc_xO_3-?,increases with the increase of temperature in Ar-H₂ mixed atmosphere at 400-900 ?.Sc doping can significantly improve the electrical conductivity of CaHfO₃ based materials.When Sc is doped,x=0.1,the electrical conductivity is the largest,reaching up to 1.88x10-3S/cm.x=0.1 is the best.3.In the process of the preparation of proton conductor,the grain size can be increased and the grain boundary area can be reduced,which is beneficial to improve the electrical conductivity of CaHf_0.9Sc_0.1O_3-?.4.Arrhenius equation were obtained through the data fitting and calculation.The conductivity activation energy was about 0.66eV?x=0?,0.35eV?x=0.1?,0.37eV?x=0.2?,0.34eV?x=0.3?.5.Electrical conductivity analysis results show that CaHf_0.9Sc_0.1O_3-? and CaZr_0.9Sc_0.1O_3-?have the higher conductivity at 400-900?.And CaHf_0.9Sc_0.1O_3-?is better than CaZr_0.9Sc_0.1O_3-?.CaHf_0.9Sc_0.1O_3-? is the best at 550-900?.CaHf_0.9Sc_0.1O_3-? is slightly lower than Ba₃Ca_1.18Nb₍1.82_O9-?.So the best proton conductor material for the study is CaHf_0.9Sc_0.1O_3-?.6.The results about the protonic transport number show thatCaZr_0.9In_0.1O_3-? is almost a pure proton conductor material at 500-750?,CaHf_0.9Sc_0.1O_3-? is almost a pure proton conductor material at 500-850 ?.Because the protonic transport number is more than 0.9.And CaHf_0.9Sc_0.1O_3-? is better than CaZr_0.9In_0.1O_3-? about the Protonic conductivity.