摘要
用高温固相反应法首次合成了非化学计量组成的Ba1.03Ce0.8Dy0.2O3-α固体电解质样品,对其进行了X-射线衍射晶体结构测定,该样品为钙钛矿型斜方晶单相结构。分别用气体浓差电池方法和氢泵(氢的电化学透过)方法研究了它在600～1000℃下的质子和氧离子导电特性,并与化学计量组成的BaCe0.8Dy0.2O3-α固体电解质样品进行了比较。实验结果表明,Ba1.03Ce0.8Dy0.2O3-α的质子导电性优于BaCe0.8Dy0.2O3-α。Ba1.03Ce0.8Dy0.2O3-α在600～1000℃下氢气氛中的质子迁移数约为1,几乎是一个纯质子导体,而BaCe0.8Dy0.2O3-α在氢气氛中600～800℃下是一个纯质子导体,在高于800℃时是一个质子与电子的混合导体。这两个样品在氧气氛中均是氧离子与电子空穴的混合导体,具有几乎相同的氧离子迁移数。
Ba_(1.03)Ce_(0.8)Dy_(0.2)O_(3-α) solid electrolyte with nonstoichio metric composition has been synthesized for the first time by high temperature solid-state reaction.The crystal structure was determined by X-ray diffraction.The sa mple was a single-phase structure of perovsk ite-type orthorhombic system.Its c onduction properties of proton and o xide-ion were investigated in the temperatur e range of 600～1000℃by means of gas concentration cells and hydrogen pumping(electrochemical hydrogen permeati on),respectively,and compared them wi th those of the stoichiometric composition of BaCe 0.8 Dy 0.2 O 3-α solid electrolyte.The experimenta l results indicate that Ba 1.03 Ce 0.8 Dy 0.2 O 3-α is superior to BaCe 0.8 Dy 0.2 O 3-α in the protonic conduction.Ba 1.03 Ce 0.8 Dy 0.2 O 3-α is almost a pure proton conductor(proton transport number is about equ al 1)over the temperature range of 600～1000℃,whereas BaCe 0.8 Dy 0.2 O 3-α is a pure proton conductor at 600～800℃,however,it becomes a mixed conductor of proton and electron above800℃under hydrogen atmosphere.Both the samples are all a mixed conducto r of oxide-ion and electron hole with an almost same oxide-ionic transport number under oxygen atmosphere.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2002年第12期1200-1204,共5页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金资助项目(No.20171034)。
