High performance of proton-conducting solid oxide fuel cell with a layered PrBaCo2O5+δ cathode

Zhao, Ling; He, Beibei; Lin, Bin; Ding, Hanping; Wang, Songlin; Ling, Yihan; Peng, Ranran; Meng, Guangyao; Liu, Xingqin

doi:10.1016/j.jpowsour.2009.06.010

Cited by 119 publications

(43 citation statements)

References 14 publications

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“…5b. This is caused by the loss of lattice oxygen [31,34], which accompanies with the formation of oxygen vacancy and the annihilation of electronic holes. The latter leads to the decrease in electrical conductivity of materials.…”

Section: Oxygen Permeation Flux Measurementmentioning

confidence: 99%

Oxygen permeability of Ce0.8Sm0.2O2 − δ–LnBaCo2O5 + δ (Ln=La, Nd, Sm, and Y) dual-phase ceramic membranes

Chen

Zhao

Xie

et al. 2014

Ionics

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Ce 0.8 Sm 0.2 O 2 − δ -LnBaCo 2 O 5 + δ (SDC-LnBCO, Ln=La, Nd, Sm, and Y) composites were prepared and characterized as dense ceramic membranes for oxygen separation. Ce 0.8 Sm 0.2 O 2−δ (SDC) shows a good chemical compatibility with LaBaCo 2 O 5+δ (LBCO), NdBaCo 2 O 5+δ (NBCO), and SmBaCo 2 O 5+δ (SBCO), while a little of impurity is detected in the sample with YBaCo 2 O 5+δ (YBCO). The SDC-SBCO and SDC-YBCO samples exhibit larger grain size than SDC-LBCO and SDC-NBCO. The incorporation of SDC increases the structural stability and decreases the thermal expansion coefficient of LnBCO at high temperature. The oxygen permeation flux of SDC-LnBCO dual-phase membrane decreases with decreasing Ln 3+ radius, which is 2.57×10 −7 , 1.58×10 −7 , 8.05×10 −8 , and 7.57×10 −8 mol cm −2 s −1 at 925°C for SDC-LBCO, SDC-NBCO, SDC-SBCO, and SDC-YBCO membranes, respectively. Increasing the flow rate of feeding and sweeping gas can create oxygen partial pressure gradient, and thus, increase the oxygen permeability. These results indicate that SDC-LBCO and SDC-NBCO composites are promising candidates for oxygen permeation membrane.

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Section: Oxygen Permeation Flux Measurementmentioning

confidence: 99%

Oxygen permeability of Ce0.8Sm0.2O2 − δ–LnBaCo2O5 + δ (Ln=La, Nd, Sm, and Y) dual-phase ceramic membranes

Chen

Zhao

Xie

et al. 2014

Ionics

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“…Nevertheless it has been reported the use of a unique phase based on mixed oxygen-ionic electronic conductor as cathode, e.g. PrBaCoO 5+d [10] or Ba 0.6 Sr 0.4 Co 0.9 Nb 0.1 O 3-d [11]. This kind of cathodes may have limitations due to the lack of a proton conducting network, i.e.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Properties of PSFC–BCYb Composites as Cathodes for Proton Conducting Solid Oxide Fuel Cells

2010

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The electrochemical properties of mixed conducing ceramic–ceramic composites for proton conducting fuel cells have been investigated. Different ratios of Pr0.58Sr0.4Fe0.8Co0.2O3–δ–BaCe0.9Yb0.1O3–δ composites have been tested as cathodes in symmetrical cells based on BaCe0.9Y0.1O3–δ dense electrolytes. Impedance measurements have been carried out in the temperature range of 600–800 °C under wet (2.5%) air. Different dilutions on both oxygen partial pressure and water content have been performed as a function of the temperature in order to characterise the processes (surface reaction and charge transport) occurring at the composite electrode under oxidising conditions. The variation of the impedance spectra after replacing protonated water by heavy water has been studied in order to understand the role of the proton transport in the overall composite cathode operation. Additional four‐point DC‐conductivity measurements have been done under different atmospheres comprising different oxygen partial pressures and H2O/D2O saturation for composites and single materials.

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“…6c, the power performance obtained in this work is compared with that in the recent literature reports focusing on Zr and Y co-doped BaCeO 3 -based proton conducting SOFCs. [44][45][46][47][48] The performance reported here is comparable or superior to that of many BaCeO 3 -based proton conducting SOFCs. 17,44,45 There are a few reports in the literature on BaCeO 3 -based P-SOFCs with remarkable performance, as shown in Fig.…”

Section: Resultsmentioning

confidence: 60%

“…6c. [46][47][48] However, the inherent chemically unstable nature of BaCeO 3 -based materials, demonstrated by many previous studies, 25,27,[49][50][51] warrants further works to be carried out on chemically stable BaZrO 3 -based P-SOFCs for practical applications. Fig.…”

Section: Resultsmentioning

confidence: 99%

Y and Ni Co-Doped BaZrO₃as a Proton-Conducting Solid Oxide Fuel Cell Electrolyte Exhibiting Superior Power Performance

Shafi

Boulfrad

et al. 2015

J. Electrochem. Soc.

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The fabrication of anode supported single cells based on BaZr 0.8 Y 0.2 O 3-δ (BZY20) electrolyte is challenging due to its poor sinteractive nature. The acceleration of shrinkage behavior, improved sinterability and larger grain size were achieved by the partial substitution of Zr with Ni in the BZY perovskite. Phase pure Ni-doped BZY powders of nominal compositions BaZr 0.8-x Y 0.2 Ni x O 3-δ were synthesized up to x = 0.04 using a wet chemical combustion synthesis route. BaZr 0.76 Y 0.2 Ni 0.04 O 3-δ (BZYNi04) exhibited adequate total conductivity and the open circuit voltage (OCV) values measured on the BZYNi04 pellet suggested lack of significant electronic contribution. The improved sinterability of BZYNi04 assisted the ease in film fabrication and this coupled with the application of an anode functional layer and a suitable cathode, PrBaCo 2 O 5+δ (PBCO), resulted in a superior fuel cell power performance. With humidified hydrogen and static air as the fuel and oxidant, respectively, a peak power density value of 428 and 240 mW cm −2 was obtained at 700 and 600 • C, respectively. The increasing worldwide energy demand and the threatening environmental pollution from conventional fossil fuel combustion call for the thrive of sustainable alternative energy supply. In the past decade, there has been a growing interest toward proton conducting ceramics owing to their high proton conductivity with low activation energies at intermediate temperatures.1 These ceramic materials, termed as high temperature proton conductors (HTPCs), exhibit proton conductivity under hydrogen and/or steam atmospheres 2-6 and find applications as electrolyte membranes for proton conducting solid oxide fuel cells 7,8 and steam electrolyzers, 9,10 as well as hydrogen separation membranes. 11-14One of the major challenges for practical deployment has been the selection of an appropriate electrolyte material with adequate ionic conductivity at low temperatures, good processability, and chemical stability for long-term operation in working conditions. To date, although a wide range of proton conductor materials has been reported, 15,16 the majority of the researches on HTPC electrolytes still focus on BaCeO 3 and BaZrO 3 related materials.17,18 Y-doped BaCeO 3 (BCY) exhibits good sinterability with appropriate protonic conductivity, but practical application is hindered by its reactivity with acidic gases such as CO 2 that leads to decomposition into BaCO 3 and CeO 2 . In contrast, Y-doped BaZrO 3 (BZY) is chemically stable at fuel cell working conditions, but BZY poor sinterability results in large volumes of poorly conducting grain boundaries in ceramic bodies that end up in significantly reducing the total proton conductivity. Nonetheless, it has been reported that grain boundary free BZY thin films exhibit superior bulk proton conductivity. 19The fabrication of BZY-based cells with high ionic conductivity and dense microstructure is a major challenge. The refractory nature of BaZrO 3 hinders its application in fuel cells or other rel...

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High performance of proton-conducting solid oxide fuel cell with a layered PrBaCo2O5+δ cathode

Cited by 119 publications

References 14 publications

Oxygen permeability of Ce0.8Sm0.2O2 − δ–LnBaCo2O5 + δ (Ln=La, Nd, Sm, and Y) dual-phase ceramic membranes

Oxygen permeability of Ce0.8Sm0.2O2 − δ–LnBaCo2O5 + δ (Ln=La, Nd, Sm, and Y) dual-phase ceramic membranes

Electrochemical Properties of PSFC–BCYb Composites as Cathodes for Proton Conducting Solid Oxide Fuel Cells

Y and Ni Co-Doped BaZrO₃as a Proton-Conducting Solid Oxide Fuel Cell Electrolyte Exhibiting Superior Power Performance

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High performance of proton-conducting solid oxide fuel cell with a layered PrBaCo2O5+δ cathode

Cited by 119 publications

References 14 publications

Oxygen permeability of Ce0.8Sm0.2O2 − δ–LnBaCo2O5 + δ (Ln=La, Nd, Sm, and Y) dual-phase ceramic membranes

Oxygen permeability of Ce0.8Sm0.2O2 − δ–LnBaCo2O5 + δ (Ln=La, Nd, Sm, and Y) dual-phase ceramic membranes

Electrochemical Properties of PSFC–BCYb Composites as Cathodes for Proton Conducting Solid Oxide Fuel Cells

Y and Ni Co-Doped BaZrO3as a Proton-Conducting Solid Oxide Fuel Cell Electrolyte Exhibiting Superior Power Performance

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Y and Ni Co-Doped BaZrO₃as a Proton-Conducting Solid Oxide Fuel Cell Electrolyte Exhibiting Superior Power Performance