Ceramic membrane fuel cells based on solid proton electrolytes

Meng, Guangyao; Ma, Guilin; Ma, Qianli; Peng, Ranran; Liu, Xingqin

doi:10.1016/j.ssi.2007.02.018

Cited by 101 publications

(46 citation statements)

References 31 publications

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“…It is well known that proton-conducting SOFCs have attracted much attention and show great advantages over oxide ion-conducting SOFCs, such as lower activation energy of polarization and higher energy efficiency [3][4][5]. BaZr 0.1 Ce 0.7 Y 0.2 O 3−δ (BZCY) can be used as an electrolyte for proton-conducting IT-SOFC development because it shows adequate proton conductivity as well as sufficient chemical and thermal stability over a wide range of SOFC operating conditions [6].…”

Section: Introductionmentioning

confidence: 99%

Novel layered perovskite GdBaCuFeO5+x as a potential cathode for proton-conducting solid oxide fuel cells

Zhang

Zhou

Wang

2013

Ionics

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A layered perovskite GdBaCuFeO 5+x (GBCuF) was developed as a cathode material for intermediatetemperature solid oxide fuel cells based on a protonconducting electrolyte of stable BaZr 0.1 Ce 0.7 Y 0.2 O 3−δ (BZCY). The X-ray diffraction results showed that GBCuF was chemically compatible with BZCY after co-fired at 1,000°C for 10 h. The thermal expansion coefficient of GBCuF, which showed a reasonably reduced value (15.1× 10 −6 K −1 ), was much closer to that of BZCY than the cobalt-containing conductor. The button cells of Ni-BZCY/BZCY/GBCuF were fabricated and tested from 500 to 700°C with humidified H 2 (∼3 % H 2 O) as a fuel and ambient oxygen as the oxidant. A high opencircuit potential of 1.04 V, maximum power density of 414 mW cm −2 , and a low electrode polarization resistance of 0.21 Ω cm 2 were achieved at 700°C, with calculated activation energy (E a ) of 128 kJ mol −1 for the GBCuF cathode. The experimental results indicated that the layered perovskite GBCuF is a good candidate for cathode material.

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Section: Introductionmentioning

confidence: 99%

Novel layered perovskite GdBaCuFeO5+x as a potential cathode for proton-conducting solid oxide fuel cells

Zhang

Zhou

Wang

2013

Ionics

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“…Perovskite-type doped barium cerate (BaCeO 3 ) materials exhibit fairly high proton conductivity in humidified reducing atmosphere at intermediate temperature and thus it could be considered as a promising electrolyte for SOFCs [2]. With this kind of proton conducting electrolyte, the H 2 O is produced in cathode side in fuel cells which does not dilute the fuel gas in anode compartment.…”

Section: Introductionmentioning

confidence: 99%

A stable BaCeO3-based proton conductor for solid oxide fuel cells

Yan

Wang

Chen

et al. 2009

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In order to improve the chemical stability of BaCeO 3 , Ti 4+ was introduced into B site of BaCeO 3 to modify the chemical stability. XRD test demonstrates that BaCe 0:6 Ti 0:2 Y 0:2 O 3Àd (BCTY) keeps its original pervoskitetype structure at a high doping level of 20%. After exposure in 94% N 2 +3% CO 2 +3% H 2 O at 700°C for 10 h, BCTY exhibited adequate chemical stability while decomposition was found in BaCe 0:8 Y 0:2 O 3Àd (BCY). Accordingly, the conductivity of BCTY reaches 0.0072 S/cm at 700°C in humidified hydrogen which is a little lower than BCY (0.0085). Besides, BCTY displayed better sintering characteristics than BCY at high temperatures and the relative density reaches 96.4% and 94.8%, respectively. The two samples also exhibited similar thermal expansion behavior from 30 to 1,000°C. A fuel cell with BCTY as electrolyte exhibited 244 mW/cm 2 at 700°C and the stable short-term performance further proved the stability of BCTY.

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“…Among the benefits of ammonia are that it is easy to store as a liquid and would simply produce N 2 and H 2 O in terms of emissions in a fuel cell. Consequently a number of researchers have investigated the operation of solid oxide fuel cells with NH 3 as the fuel, with promising results obtained [1][2][3][4][5][6]. However, the use of NH 3 in place of H 2 raises other questions, in particular the possibility that nitridation may occur on the anode side of the cell under operating conditions.…”

Section: Introductionmentioning

confidence: 99%

Formation of apatite oxynitrides by the reaction between apatite-type oxide ion conductors, La8+xSr2−x(Si/Ge)6O26+x/2, and ammonia

Orera

Headspith

Apperley

et al. 2009

Journal of Solid State Chemistry

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Following growing interest in the use of ammonia as a fuel in Solid Oxide Fuel Cells (SOFCs), we have investigated the possible reaction between the apatite silicate/germanate electrolytes, La 8+x Sr 2-x (Si/Ge) 6 O 26+x/2 , and NH 3 gas. We examine how the composition of the apatite phase affects the reaction with ammonia. For the silicate series, the results showed a small degree of N incorporation at 600 ○ C, while at higher temperatures (800 ○ C), substantial N incorporation was observed. For the germanate series, partial decomposition was observed after heating in ammonia at 800 ○ C, while at the lower temperature (600 ○ C), significant N incorporation was observed. For both series, the N content in the resulting apatite oxynitride was shown to increase with increasing interstitial oxide ion content (x) in the starting oxide. The results suggest that the driving force for the nitridation process is to remove the interstitial anion content, such that for the silicates the total anion (O+N) content in the oxynitrides approximates to 26.0, the value for an anion stoichiometric apatite. For the germanates, lower total anion contents are observed in some cases, consistent with the ability of the germanates to accommodate anion vacancies. The removal of the mobile interstitial oxide ions on nitridation suggests problems with the use of apatite-type electrolytes in SOFCs utilising NH 3 at elevated temperatures.

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Ceramic membrane fuel cells based on solid proton electrolytes

Cited by 101 publications

References 31 publications

Novel layered perovskite GdBaCuFeO5+x as a potential cathode for proton-conducting solid oxide fuel cells

Novel layered perovskite GdBaCuFeO5+x as a potential cathode for proton-conducting solid oxide fuel cells

A stable BaCeO3-based proton conductor for solid oxide fuel cells

Formation of apatite oxynitrides by the reaction between apatite-type oxide ion conductors, La8+xSr2−x(Si/Ge)6O26+x/2, and ammonia

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