Incorporation and conduction of proton in SrCe0.9−xZrxY0.1O3−δ

The performance of protonic ceramic fuel cells (PCFCs) using thin film BaCe 0.6 Zr 0.2 Y 0.2 O 3-δ (BCZY622) electrolyte has been studied. The reference cell with the La 0.8 Sr 0.2 MnO 3-δ cathode and Ni anode showed poor performance and short-term degradation. The overpotential of the anode and ohmic loss were the major factors for degradation, and a solid solution of Ni in the BCZY electrolyte has been observed. The electrical conductivity and the proton concentration of BCZY and BCZY622 doped with 5wt% NiO were measured by an impedance analysis and thermogravimetric analysis. The electrical conductivity and the proton concentration of BCZY622 decreased by introducing NiO. To avoid short-term degradation, the cell construction, manufacturing process, and cathode materials were improved. As a result, a carefully designed PCFC with thin film BCZY622, Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ cathode and Ni/BCZY622 cermet anode showed good power density of 200-300mW/cm 2 in the wide temperature range of 873 -1073K, and had stable power generation.

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“…In a previous study [13,[15][16][17][18], we suggested that the partial oxygen vacancies cannot take part in the hydration. •…”

Section: Ni Addition Effect On the Conductivity And Proton Concentrationmentioning

confidence: 88%

“…The hydration energy,  G ∆ , of BCZY622 and the 5 wt.% Ni doped BCZY622 was estimated using the following equation [18]: …”

Section: Ni Addition Effect On the Conductivity And Proton Concentrationmentioning

confidence: 99%

Improvement of Protonic Ceramic Fuel Cells with Thin Film BCZY Electrolyte

et al. 2015

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“…The proton-conducting electrolytes of the SrCeO 3 and BaCeO 3 systems have high conductivity, up to 0.07 S cm −1 at 800 • C, which is higher than those of the SrZrO 3 and BaZrO 3 systems [5][6][7][8][9]. However, these systems are not chemically stable in the presence of water vapor or CO 2 [9][10][11][12][13][14]. The BaCe 0.8−y Zr y Y 0.2 O 3−δ (BCZY) system has relatively high proton conductivity with thermodynamic stability in the presence of water vapor and CO 2 at high temperature and is a promising candidate electrolyte for SOECs [15][16][17][18].…”

Section: Introductionmentioning

confidence: 91%

“…SOECs utilizing a proton-conducting electrolyte, however, can produce high purity hydrogen directly at the hydrogen electrode [2][3][4]. The proton-conducting electrolytes of the SrCeO 3 and BaCeO 3 systems have high conductivity, up to 0.07 S cm −1 at 800 • C, which is higher than those of the SrZrO 3 and BaZrO 3 systems [5][6][7][8][9]. However, these systems are not chemically stable in the presence of water vapor or CO 2 [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Evaluation of Ni Catalysts Supported on BaCe0.5Zr0.3−xY0.2NixO3−δ with Fused-Aggregate Network Structure for the Hydrogen Electrode of Solid Oxide Electrolysis Cell

et al. 2017

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Nickel nanoparticles loaded on the electron-proton mixed conductor BaCe 0.5 Zr 0.3−x Y 0.2 Ni x O 3−δ (Ni/BCZYN, x = 0 and 0.03) were synthesized for use in the hydrogen electrode of a proton-conducting solid oxide electrolysis cell (SOEC). The Ni nanoparticles, synthesized by an impregnation method, were from 45.8 nm to 84.1 nm in diameter, and were highly dispersed on the BCZYN. The BCZYN nanoparticles, fabricated by the flame oxide synthesis method, constructed a unique microstructure, the so-called "fused-aggregate network structure". The BCZYN nanoparticles have capability of constructing a scaffold for the hydrogen electrode with both electronically conducting pathways and gas diffusion pathways. The catalytic activity on Ni/BCZYN (x = 0 and 0.03) catalyst layers (CLs) improved with the circumference length of the Ni nanoparticles. Moreover, the catalytic activity on the Ni/BCZYN (x = 0.03) CL was higher than that of the Ni/BCZYN (x = 0) CL. BCZYN (x = 0.03) possesses higher electronic conductivity than BCZYN (x = 0) due to the Ni doping, resulting in an enlarged effective reaction zone (ERZ). We conclude that the proton reduction reaction in the ERZ was the rate-determining step on the hydrogen electrode, and the reaction was enhanced by improving the electronic conductivity of the electron-proton mixed conductor BCZYN.

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“…The Raman band around 370 cm -1 is SrCeO 3 like peak. A small band near 500 cm -1 was attributed to torsional mode of the B-O bond of the B sites and between 450-550 cm -1 is CeO 2 like peak [26,27]. The small peak near 708 cm -1 can be assigned to the symmetric metal-oxygen stretching vibrations of the BO6 octahedra [29,31].…”

Section: Ftrs-fourier Transforms Raman Spectroscopymentioning

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

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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.

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Incorporation and conduction of proton in SrCe0.9−xZrxY0.1O3−δ

Cited by 44 publications

References 12 publications

Improvement of Protonic Ceramic Fuel Cells with Thin Film BCZY Electrolyte

Improvement of Protonic Ceramic Fuel Cells with Thin Film BCZY Electrolyte

Synthesis and Evaluation of Ni Catalysts Supported on BaCe0.5Zr0.3−xY0.2NixO3−δ with Fused-Aggregate Network Structure for the Hydrogen Electrode of Solid Oxide Electrolysis Cell

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

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