Proton Conduction in La0.9Sr0.1Ga0.8Mg0.2O3-
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- 作者：Guilin Ma ; Feng Zhang ; Jianli Zhu ; Guangyao Meng
- 刊名：Chemistry of Materials
- 出版年：2006
- 出版时间：December 12, 2006
- 年：2006
- 卷：18
- 期：25
- 页码：6006 - 6011
- 全文大小：89K
- 年卷期：v.18,no.25(December 12, 2006)
- ISSN：1520-5002
文摘
The conduction behavior of La0.9Sr0.1Ga0.8Mg0.2O3-
ceramics was investigated using electrochemicalmethods under various atmospheres in the temperature range of 600-1000 
C. The proton conduction inLa0.9Sr0.1Ga0.8Mg0.2O3- ceramics is the first time it has been discovered in a hydrogen-containingatmosphere. The hydrogen concentration cell using La0.9Sr0.1Ga0.8Mg0.2O3- as an electrolyte showedstable electromotive forces close to the theoretical ones calculated from Nernst's equation, indicating theion nature of the conduction. An isotope effect on the conductivity was observed using D2O-Ar insteadof H2O-Ar as the atmosphere. The proton conduction in the specimen was directly confirmed by anelectrochemical hydrogen permeation (hydrogen pumping) experiment. In a hydrogen atmosphere,La0.9Sr0.1Ga0.8Mg0.2O3- was found to be an excellent proton conductor, with a proton conductivity of
H+ = 1.4 × 10-2 to 1.4 × 10-1 S cm-1 and a proton transport number of tH+ > 0.99, which are comparableto those of proton-conducting BaCeO3-based oxides and Ba3Ca1.18Nb1.82O9-. In a water-vapor-containingair atmosphere, the specimen was found to be a mixed-ion (proton + oxide ion) conductor, and theproton and oxide-ion transport numbers were about 0.05-0.20 and 0.95-0.80, respectively, whereas indry oxygen-containing atmospheres, the specimen was a pure oxide-ion conductor.
ceramics was investigated using electrochemicalmethods under various atmospheres in the temperature range of 600-1000 C. The proton conduction inLa0.9Sr0.1Ga0.8Mg0.2O3- ceramics is the first time it has been discovered in a hydrogen-containingatmosphere. The hydrogen concentration cell using La0.9Sr0.1Ga0.8Mg0.2O3- as an electrolyte showedstable electromotive forces close to the theoretical ones calculated from Nernst's equation, indicating theion nature of the conduction. An isotope effect on the conductivity was observed using D2O-Ar insteadof H2O-Ar as the atmosphere. The proton conduction in the specimen was directly confirmed by anelectrochemical hydrogen permeation (hydrogen pumping) experiment. In a hydrogen atmosphere,La0.9Sr0.1Ga0.8Mg0.2O3- was found to be an excellent proton conductor, with a proton conductivity ofH+ = 1.4 × 10-2 to 1.4 × 10-1 S cm-1 and a proton transport number of tH+ > 0.99, which are comparableto those of proton-conducting BaCeO3-based oxides and Ba3Ca1.18Nb1.82O9-. In a water-vapor-containingair atmosphere, the specimen was found to be a mixed-ion (proton + oxide ion) conductor, and theproton and oxide-ion transport numbers were about 0.05-0.20 and 0.95-0.80, respectively, whereas indry oxygen-containing atmospheres, the specimen was a pure oxide-ion conductor.