Protonic conduction in Zr-substituted BaCeO3

Katahira, Koji; Kohchi, Yoshirou; Shimura, Tetsuo; Iwahara, Hiroyasu

doi:10.1016/s0167-2738(00)00777-3

Cited by 705 publications

(541 citation statements)

References 12 publications

Supporting

Mentioning

502

Contrasting

Unclassified

Order By: Relevance

“…[7][8][9] In comparison, proton conducting oxides, many of which are perovskite-structured, offer higher ionic conductivity with low electronic transport number as well as lower activation energy at intermediate temperature. [10][11][12][13][14][15][16] As a result, they are regarded as the preferred electrolyte for IT-SOFC. 17 For IT-SOFC, the cathode process is generally regarded as the rate-limiting step due to its high activation energy compared to the electrolyte.…”

Section: 2mentioning

confidence: 99%

Effects of H₂O and CO₂on Electrochemical Behaviors of BSCF Cathode for Proton Conducting IT-SOFC

Sun

Cheng

2016

J. Electrochem. Soc.

View full text Add to dashboard Cite

Proton conducting intermediate temperature (400-700 • C) solid oxide fuel cells (IT-SOFC) have attracted great interest recently. However, for SOFC operation at intermediate temperature, cathode is often considered to be the main factor limiting the overall cell performance. In this study, Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ (BSCF), which is one of the most active cathode materials and shows significant hydration effect suggesting possible proton conductivity, was investigated as the cathode for proton conducting IT-SOFC at temperature down to ∼450 • C. The stability and compatibility of BSCF cathode with BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 O 3-δ (BZCYYb), one of the leading proton conducting electrolyte materials, were studied at intermediate temperature in various atmospheres. In addition, experiments were carried out to understand the electrochemical behaviors of BSCF as a mixed proton, oxide ion and electron conducting cathode using BSCF/BZCYYb/BSCF symmetrical cells in simulated air containing different concentrations of water vapor (H 2 O) and carbon dioxide (CO 2 ), especially at lower temperature of ∼450 • C. The results are analyzed from the underlying oxygen electrode reaction mechanism point of view, and the direction for future research to further improve the cathode for proton conducting IT-SOFC is pointed out.

show abstract

Section: 2mentioning

confidence: 99%

Effects of H₂O and CO₂on Electrochemical Behaviors of BSCF Cathode for Proton Conducting IT-SOFC

Sun

Cheng

2016

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…반면에 BaZrO3 는 화학적으로 안정하고 높은 bulk전도도를 보여주 [2][3][4][5][6] . 그러나 1600℃ 이상의 높 은 소결(sintering) 온도가 필요하고, 소결 후 grain 크 기가 1μm 이하로 grain boundary 영역에 의한 전도도 저하가 발생한다 [7][8][9][10] .…”

Section: 서 론unclassified

A Study on Sintering Behavior and Conductivity for NiO-doped BaZr_0.85Y_0.15O_3-_δ

Park¹,

Kim

Kim³

et al. 2012

Transactions of the Korean hydrogen and new energy society

View full text Add to dashboard Cite

>> Perovskite-type oxides such as doped barium zirconate (BaZrO3) show high proton conductivity and chemical stability when they are exposed to hydrogen and water vapour containing atmospheres, thus it can be applicable to the hydrogen separation and the fuel cell electrolyte membranes. However the high temperature (1700-1800℃) and long sintering times (24h) are generally required to prepare the fully densified BaZrO3 pellets. These sintering conditions lead to the limitation of the grain size growth and the degradation of conductivity due to the acceleration of BaO evaporation at 1200℃. Here we demonstrate NiO-doped BaZr0.85Y0.15O3-δ with lower calcination and sintering temperature, less experimental procedure and lower process cost than the conventional mixing method. The stoichiometry of BaZr0.85Y0.15O3-δ was optimized by the control of excess amount of Ba (5mol%) to minimized BaO evaporation. We found that the crystal size of NiO-doped BaZr0.85Y0.15O3-δ was increased with increase of calcination temperature from XRD analysis. NiO-doped BaZr0.85Y0.15O3-δ powder was calcined at 1000℃ for 12h when its showed the highest conductivity of 3.3ⅹ10 -2 s/cm.

show abstract

“…With the help of these methods fine powder morphology with less contamination can be obtained. Sol-gel and Pechini method utilizes the features of both citric acid & ethylenediaminetetra acetic acid (EDTA) to form polybasic acid chelated with various metal cations [12][13]. As a result, these methods are able to produce a single-phase powder and dense pellet at relatively low temperature (800-1400°C).The reduction in processing temperature may be due to the sol-gel process assisted with complexing or chelating agents.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Ba0.96Sr0.04Ce0.7Zr0.3O3 Solid Oxide Fuel Cell Electrolyte by Citrate EDTA Complexing Sol-Gel Process

Sailaja

Murali

Samatha

et al. 2016

ILCPA

View full text Add to dashboard Cite

Abstract. This paper reports on the effect of Strontium doping on BaCe 0.7 Zr 0.3 O 3 electrolyte prepared using the citrate-EDTA complexing sol-gel process at temperature T=1000°C. The phase formation and evolution with the temperature has been studied by X-ray diffraction (XRD), thermal analysis (TG-DTA). The morphology of the sintered powder at T=1300°C is examined by SEMScanning Electron Microscopy, EDAX -Energy-dispersive X-ray spectroscopy analysis, FTIR -Fourier transforms infrared spectrometer, FTRS -Raman measurements. The crystallite size of the ceramic powders calculated from Scherrer equation is 28nm and the diffraction peak shifted to higher angles. Microstructure of the sintered powder revealed that the average grain size is in the range of 2 m. The incorporation of Sr is found to suppress the formation of CeO 2 like second phase and enhance the grain growth in sintered oxides. Dense ceramic materials were obtained at 1300°C and the relative density is 80% of the theoretical density. FTIR and Raman measurements reveal the complete single phase formation of the orthorhombic perovskite structure. The ionic conductivity of the pellet is investigated from room temperature to 400°C and is found to be 1.1x10 -4 S/cm (400°C). The conductivity increased as temperature increases with an activation energy of 0.48eV and hence this composition qualifies to be a promising electrolyte.

show abstract

Protonic conduction in Zr-substituted BaCeO3

Cited by 705 publications

References 12 publications

Effects of H₂O and CO₂on Electrochemical Behaviors of BSCF Cathode for Proton Conducting IT-SOFC

Effects of H₂O and CO₂on Electrochemical Behaviors of BSCF Cathode for Proton Conducting IT-SOFC

A Study on Sintering Behavior and Conductivity for NiO-doped BaZr_0.85Y_0.15O_3-_δ

Synthesis and Characterization of Ba<sub>0.96</sub>Sr<sub>0.04</sub>Ce<sub>0.7</sub>Zr<sub>0.3</sub>O<sub>3</sub> Solid Oxide Fuel Cell Electrolyte by Citrate EDTA Complexing Sol-Gel Process

Contact Info

Product

Resources

About

Protonic conduction in Zr-substituted BaCeO3

Cited by 705 publications

References 12 publications

Effects of H2O and CO2on Electrochemical Behaviors of BSCF Cathode for Proton Conducting IT-SOFC

Effects of H2O and CO2on Electrochemical Behaviors of BSCF Cathode for Proton Conducting IT-SOFC

A Study on Sintering Behavior and Conductivity for NiO-doped BaZr0.85Y0.15O3-δ

Synthesis and Characterization of Ba<sub>0.96</sub>Sr<sub>0.04</sub>Ce<sub>0.7</sub>Zr<sub>0.3</sub>O<sub>3</sub> Solid Oxide Fuel Cell Electrolyte by Citrate EDTA Complexing Sol-Gel Process

Contact Info

Product

Resources

About

Effects of H₂O and CO₂on Electrochemical Behaviors of BSCF Cathode for Proton Conducting IT-SOFC

Effects of H₂O and CO₂on Electrochemical Behaviors of BSCF Cathode for Proton Conducting IT-SOFC

A Study on Sintering Behavior and Conductivity for NiO-doped BaZr_0.85Y_0.15O_3-_δ