A Novel Composite Cathode for Low‐Temperature SOFCs Based on Oxide Proton Conductors

Yang, Lei; Zuo, Chendong; Wang, Shizhong; Cheng, Zhe; Liu, Meilin

doi:10.1002/adma.200702762

Cited by 323 publications

(178 citation statements)

References 19 publications

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“…Interestingly, the largest power density has been reported for a cell made with the thickest BCZY membrane. In particular, the best performance was obtained using a 65 µm thick BCZY membrane fabricated by co-pressing method, SSC-BCZY composite cathode, and a NiO-BZCY anode with the two phases in a 1 : 1.92 weight ratio and rice starch as the pore former, to the best of our knowledge [83]. The worst performance reported for a BCZY-based SOFC was obtained, to the best of our knowledge, using a 25 µm thick BCZY membrane fabricated by co-pressing, a BaCe 0.5 Bi 0.5 O 3−δ cathode, and a NiO-BCZY anode with the two phases in a 3 : 2 weight ratio and the addition of 20 wt% of corn starch [76].…”

Section: Present Performance Of Proton Conducting Sofcs and Future Gumentioning

confidence: 95%

“…Other [82] and SSC mixed with BZCY in a 3 : 2 weight ratio [83]. The cell using the last cathode showed the largest power density among anode-supported protonic SOFCs.…”

Section: Cathode Materials For Htpc Electrolytesmentioning

confidence: 99%

“…However, in contrast to the previous case, poor power output values were obtained owing to large ohmic losses. Still, using BCY as a thin electrolyte membrane, large power density output was reported by Balachandran et al [88], reaching about 1.5 W cm −2 at 800 • C. Up to now, the most popular electrolyte for protonic SOFCs is definitively BCZY [57,59,76,80,83], which has been claimed to exhibit high conductivity and good chemical stability for fuel cell application [85], even though later works demonstrated that this compound is unstable in the presence of CO 2 [14,66]. In these works, BCZY layers, with a thickness ranging between 10 and 65 µm, were deposited onto a NiO-BCZY supporting anode by co-pressing, drop-coating, screen printing, or spray-coating, in some cases adding a pore former to the anode powder to achieve a greater anode porosity [57,76,80].…”

Section: Present Performance Of Proton Conducting Sofcs and Future Gumentioning

confidence: 99%

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Electrode materials: a challenge for the exploitation of protonic solid oxide fuel cells

Fabbri

Pergolesi

Traversa

2010

Science and Technology of Advanced Materials

131

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High temperature proton conductor (HTPC) oxides are attracting extensive attention as electrolyte materials alternative to oxygen-ion conductors for use in solid oxide fuel cells (SOFCs) operating at intermediate temperatures (400-700• C). The need to lower the operating temperature is dictated by cost reduction for SOFC pervasive use. The major stake for the deployment of this technology is the availability of electrodes able to limit polarization losses at the reduced operation temperature. This review aims to comprehensively describe the state-of-the-art anode and cathode materials that have so far been tested with HTPC oxide electrolytes, offering guidelines and possible strategies to speed up the development of protonic SOFCs.

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Section: Present Performance Of Proton Conducting Sofcs and Future Gumentioning

confidence: 95%

“…Other [82] and SSC mixed with BZCY in a 3 : 2 weight ratio [83]. The cell using the last cathode showed the largest power density among anode-supported protonic SOFCs.…”

Section: Cathode Materials For Htpc Electrolytesmentioning

confidence: 99%

Section: Present Performance Of Proton Conducting Sofcs and Future Gumentioning

confidence: 99%

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Electrode materials: a challenge for the exploitation of protonic solid oxide fuel cells

Fabbri

Pergolesi

Traversa

2010

Science and Technology of Advanced Materials

131

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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: 59%

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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“…The cell voltage and power density as a function of current density for the cells based on Pt/Ba 0. 8 In additions, it shows a quite smooth and good adhesion between different layers. This is analogous to the results of literature report, 19),27) a 45¯m thick electrolyte performs high power density after sintering at 1450°C.…”

Section: Resultsmentioning

confidence: 97%

Evolution of the sintering ability, microstructure, and cell performance of Ba0.8Sr0.2Ce0.8−x−yZryInxY0.2O3−δ (x = 0.05, 0.1 y = 0, 0.1) proton-conducting electrolytes for solid oxide fuel cel

Hsu

Ren

Chen

et al. 2015

J. Ceram. Soc. Japan

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A Novel Composite Cathode for Low‐Temperature SOFCs Based on Oxide Proton Conductors

Cited by 323 publications

References 19 publications

Electrode materials: a challenge for the exploitation of protonic solid oxide fuel cells

Electrode materials: a challenge for the exploitation of protonic 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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A Novel Composite Cathode for Low‐Temperature SOFCs Based on Oxide Proton Conductors

Cited by 323 publications

References 19 publications

Electrode materials: a challenge for the exploitation of protonic solid oxide fuel cells

Electrode materials: a challenge for the exploitation of protonic 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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Product

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