The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform
Jianbing Huang - One of the best experts on this subject based on the ideXlab platform.
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novel doped barium cerate carbonate composite electrolyte material for low temperature solid oxide fuel cells
International Journal of Hydrogen Energy, 2014Co-Authors: Yuanfei Hei, Jianbing Huang, Cheng Wang, Zongqiang MaoAbstract:Abstract A composite of a perovskite oxide proton conductor (BaCe0.7Zr0.1Y0.2O3−δ, BCZ10Y20) and alkali carbonates (2Li2CO3:1Na2CO3, LNC) is investigated with respect to its morphology, conductivity and fuel cell performance. The morphology shows that the presence of carbonate phase improves the densification of oxide matrix. The conductivity is measured by AC impedance in air, nitrogen, wet nitrogen, hydrogen, and wet hydrogen, respectively. A sharp increase of the conductivity at certain temperature is seen, which relates to the superionic phase transition at the interface phases between oxide and carbonates. Single cell with the composite electrolyte is fabricated by Dry-Pressing technique, using nickel oxide as anode and lithiated nickel oxide as cathode, respectively. The cell shows a maximum power density of 957 mW cm−2 at 600 °C with hydrogen as the fuel and oxygen as the oxidant. The remarkable proton conductivity and excellent cell performance make this kind of composite material a good candidate electrolyte for low temperature solid oxide fuel cells (SOFCs).
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development of solid oxide fuel cell materials for intermediate to low temperature operation
International Journal of Hydrogen Energy, 2012Co-Authors: Jianbing Huang, Cheng WangAbstract:Abstract The commercialization of solid oxide fuel cell (SOFC) needs the development of functional materials for intermediate-to-low temperature (400–700 °C, ILT) operation. Recently, we have successfully developed new electrolyte materials for ILT-SOFCs, including Ce 0.8 Sm 0.2 O 1.9 (SDC), BaCe 0.8 Sm 0.2 O 2.9 (BCSO) and SDC-carbonate composites. Compared with the state-of-the-art yttria-stabilized zirconia (YSZ), these materials exhibit much higher ionic conductivity at ILT range. Especially, SDC-carbonate composites show an ionic conductivity of 10 −2 to 1 Scm −1 between 400 and 600 °C in fuel cell environment. Some new cathode materials were investigated for above electrolyte materials and showed promising performance. Alternative anode materials were developed to directly utilize alcohol fuels. A Dry-Pressing and co-firing process was employed to fabricate thin SDC and BCSO electrolyte membranes as well as thick SDC-carbonate composite electrolyte with acceptable density on anode substrate. Many efforts have also been made on fabrication of larger-size planar cells and exploitation of reliable sealing materials.
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effects of salt composition on the electrical properties of samaria doped ceria carbonate composite electrolytes for low temperature sofcs
International Journal of Hydrogen Energy, 2010Co-Authors: Jianbing Huang, Zhan Gao, Zongqiang MaoAbstract:Abstract Samaria-doped ceria (SDC)/carbonate composite electrolytes were developed for low-temperature solid oxide fuel cells (SOFCs). SDC powders were prepared by oxalate co-precipitation method and used as the matrix phase. Binary alkaline carbonates were selected as the second phase, including (Li–Na) 2 CO 3 , (Li–K) 2 CO 3 and (Na–K) 2 CO 3 . AC conductivity measurements showed that the conductivities in air atmosphere depended on the salt composition. A sharp conductivity jump appeared at 475 °C and 450 °C for SDC/(Li–Na) 2 CO 3 and SDC/(Li–K) 2 CO 3 , respectively. However, the conductivities of SDC/(Na–K) 2 CO 3 increase linearly with temperature. Single cells based on above composite electrolytes were fabricated by Dry-Pressing and tested in hydrogen/air at 500–600 °C. A maximum power density of 600, 550 and 550 mW cm −2 at 600 °C was achieved with SDC/(Li–Na) 2 CO 3 , SDC/(Li–K) 2 CO 3 and SDC/(Na–K) 2 CO 3 composite electrolyte, respectively, which we attribute to high ionic conductivities of these composite electrolytes in fuel cell atmosphere. We discuss the conduction mechanisms of SDC/carbonate composite electrolytes in different atmospheres according to defect chemistry theory.
Wei Liu - One of the best experts on this subject based on the ideXlab platform.
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the effect of anode structure on the performance of nio bazr 0 1 ce 0 7 y 0 2 o 3 δ supported ceria based solid oxide fuel cells
Ionics, 2019Co-Authors: Zheng Gong, Wei Liu, Jie Hou, Lina Miao, Haidi TangAbstract:In this work, two asymmetric NiO-BaZr0.1Ce0.7Y0.2O3-δ (NiO-BZCY) anode substrates were prepared via the phase-inversion tape casting method for Ce0.8Sm0.2O2-δ (SDC)-based solid oxide fuel cells. The results showed that the anode support structure significantly influenced the electrochemical properties of the cells. The cell supported on the anode substrate consisted of a finger-like layer and a sponge-like layer outputs highest electrochemical performance with a maximum power density of 823 mW cm−2 at 650 °C and shows great superiority over the cell fabricated by a typical Dry-Pressing method. The excellent performances demonstrate that the phase-inversion tape casting technique is a good strategy in fabricating anode supports for SOFCs, and the anode structure with the relatively dense sponge-like layer as top surface is optimal to construct the complete cell.
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proton conducting solid oxide fuel cells with yttrium doped barium zirconate electrolyte films sintered at reduced temperatures
Journal of Alloys and Compounds, 2016Co-Authors: Zhiwen Zhu, Wenping Sun, Zhen Shi, Wei LiuAbstract:Abstract Barium zirconate-based high-temperature proton conductors have not been widely used as electrolytes for solid oxide fuel cells (SOFCs) due to the poor sintering activity and the difficulty in preparing dense and highly conductive electrolyte films. In this work, thin BaZr 0.8 Y 0.2 O 3- δ (BZY) proton-conducting electrolyte films were prepared by a conventional Dry-Pressing method followed by sintering in flowing oxygen. BZY films got fully dense after sintered at a low temperature of 1350 °C for 5 h. Single cells with BZY electrolyte films prepared at various temperatures were assembled and tested. The influence of sintering temperature on the morphology of BZY films and electrochemical performances of single cells was investigated. Besides, the open circuit voltages of the single cells as well as those previously reported BZY-based SOFCs were also discussed.
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chemically stable and easily sintered high temperature proton conductor bazr0 8in0 2o3 δ for solid oxide fuel cells
Journal of Power Sources, 2013Co-Authors: Wei Liu, Zhen Shi, Wenping Sun, Zhiwen ZhuAbstract:Abstract Barium zirconate-based high-temperature proton conductors (HTPCs) exhibit excellent chemical stability in atmospheres containing CO 2 or water vapor. However, such HPTCs haven't been widely used as electrolyte materials for solid oxide fuel cells (SOFCs) due to their poor sintering activity. In this work, indium is selected as a dopant to improve the sintering activity of barium zirconate. BaZr 0.8 In 0.2 O 3− δ (BZI) powders with a pure cubic perovskite structure are synthesized via a typical citric acid–nitrate gel combustion process. The SEM results show that BZI exhibits improved sintering activity compared to the state-of-the-art proton conductor BaZr 0.8 Y 0.2 O 3− δ (BZY), and fully dense BZI pellets with increased grain size are obtained after sintered at 1600 °C in air. Moreover, BZI also keeps sufficiently high chemical stability as BZY. The electrical conductivity of BZI under various atmospheres is investigated by electrochemical impedance spectroscopy (EIS) in detail. The total conductivity achieves 1.0 × 10 −3 S cm −1 at 700 °C in wet H 2 (3% H 2 O). Dense BZI electrolyte films are successfully fabricated on the anode substrates by a Dry-Pressing method after sintered at 1400 °C for 5 h in air. Single cells with dense BZI electrolyte films are also assembled and tested to further evaluate the feasibility of BZI as an electrolyte material for proton-conducting SOFCs.
Wenhui Su - One of the best experts on this subject based on the ideXlab platform.
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solid oxide fuel cells with dense yttria stabilized zirconia electrolyte membranes fabricated by a Dry Pressing process
Journal of Power Sources, 2006Co-Authors: Zhe Lu, Xiqiang Huang, Yaohui Zhang, Kongfa Chen, Na Ai, Wenhui SuAbstract:Dense yttria-stabilized zirconia (YSZ) electrolyte films were successfully fabricated onto anode substrates using a modified Dry Pressing process. The film thickness was uniform, and could be readily controlled by the mass of the nanocrystalline YSZ powders. The electrolyte films adhered well to the anode substrates by controlling the anode composition. An anode-supported solid oxide fuel cell (SOFC) with a dense YSZ electrolyte film of 8 mu m in thickness was operated at temperatures from 700 to 800 degrees C using humidified (3 vol% H2O) hydrogen as fuel and air as oxidant. An open circuit voltage of 1.06 V and a maximum power density of 791 mW cm(-2) were achieved at 800 degrees C. The results indicate that the gas permeation through the electrolyte film was negligible, and that good performance can be obtained by this simple and cost-effective technique which can significantly reduce the fabrication cost of SOFCs. (c) 2006 Elsevier B.V. All rights reserved.
Zongqiang Mao - One of the best experts on this subject based on the ideXlab platform.
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novel doped barium cerate carbonate composite electrolyte material for low temperature solid oxide fuel cells
International Journal of Hydrogen Energy, 2014Co-Authors: Yuanfei Hei, Jianbing Huang, Cheng Wang, Zongqiang MaoAbstract:Abstract A composite of a perovskite oxide proton conductor (BaCe0.7Zr0.1Y0.2O3−δ, BCZ10Y20) and alkali carbonates (2Li2CO3:1Na2CO3, LNC) is investigated with respect to its morphology, conductivity and fuel cell performance. The morphology shows that the presence of carbonate phase improves the densification of oxide matrix. The conductivity is measured by AC impedance in air, nitrogen, wet nitrogen, hydrogen, and wet hydrogen, respectively. A sharp increase of the conductivity at certain temperature is seen, which relates to the superionic phase transition at the interface phases between oxide and carbonates. Single cell with the composite electrolyte is fabricated by Dry-Pressing technique, using nickel oxide as anode and lithiated nickel oxide as cathode, respectively. The cell shows a maximum power density of 957 mW cm−2 at 600 °C with hydrogen as the fuel and oxygen as the oxidant. The remarkable proton conductivity and excellent cell performance make this kind of composite material a good candidate electrolyte for low temperature solid oxide fuel cells (SOFCs).
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effects of salt composition on the electrical properties of samaria doped ceria carbonate composite electrolytes for low temperature sofcs
International Journal of Hydrogen Energy, 2010Co-Authors: Jianbing Huang, Zhan Gao, Zongqiang MaoAbstract:Abstract Samaria-doped ceria (SDC)/carbonate composite electrolytes were developed for low-temperature solid oxide fuel cells (SOFCs). SDC powders were prepared by oxalate co-precipitation method and used as the matrix phase. Binary alkaline carbonates were selected as the second phase, including (Li–Na) 2 CO 3 , (Li–K) 2 CO 3 and (Na–K) 2 CO 3 . AC conductivity measurements showed that the conductivities in air atmosphere depended on the salt composition. A sharp conductivity jump appeared at 475 °C and 450 °C for SDC/(Li–Na) 2 CO 3 and SDC/(Li–K) 2 CO 3 , respectively. However, the conductivities of SDC/(Na–K) 2 CO 3 increase linearly with temperature. Single cells based on above composite electrolytes were fabricated by Dry-Pressing and tested in hydrogen/air at 500–600 °C. A maximum power density of 600, 550 and 550 mW cm −2 at 600 °C was achieved with SDC/(Li–Na) 2 CO 3 , SDC/(Li–K) 2 CO 3 and SDC/(Na–K) 2 CO 3 composite electrolyte, respectively, which we attribute to high ionic conductivities of these composite electrolytes in fuel cell atmosphere. We discuss the conduction mechanisms of SDC/carbonate composite electrolytes in different atmospheres according to defect chemistry theory.
Cheng Wang - One of the best experts on this subject based on the ideXlab platform.
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novel doped barium cerate carbonate composite electrolyte material for low temperature solid oxide fuel cells
International Journal of Hydrogen Energy, 2014Co-Authors: Yuanfei Hei, Jianbing Huang, Cheng Wang, Zongqiang MaoAbstract:Abstract A composite of a perovskite oxide proton conductor (BaCe0.7Zr0.1Y0.2O3−δ, BCZ10Y20) and alkali carbonates (2Li2CO3:1Na2CO3, LNC) is investigated with respect to its morphology, conductivity and fuel cell performance. The morphology shows that the presence of carbonate phase improves the densification of oxide matrix. The conductivity is measured by AC impedance in air, nitrogen, wet nitrogen, hydrogen, and wet hydrogen, respectively. A sharp increase of the conductivity at certain temperature is seen, which relates to the superionic phase transition at the interface phases between oxide and carbonates. Single cell with the composite electrolyte is fabricated by Dry-Pressing technique, using nickel oxide as anode and lithiated nickel oxide as cathode, respectively. The cell shows a maximum power density of 957 mW cm−2 at 600 °C with hydrogen as the fuel and oxygen as the oxidant. The remarkable proton conductivity and excellent cell performance make this kind of composite material a good candidate electrolyte for low temperature solid oxide fuel cells (SOFCs).
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development of solid oxide fuel cell materials for intermediate to low temperature operation
International Journal of Hydrogen Energy, 2012Co-Authors: Jianbing Huang, Cheng WangAbstract:Abstract The commercialization of solid oxide fuel cell (SOFC) needs the development of functional materials for intermediate-to-low temperature (400–700 °C, ILT) operation. Recently, we have successfully developed new electrolyte materials for ILT-SOFCs, including Ce 0.8 Sm 0.2 O 1.9 (SDC), BaCe 0.8 Sm 0.2 O 2.9 (BCSO) and SDC-carbonate composites. Compared with the state-of-the-art yttria-stabilized zirconia (YSZ), these materials exhibit much higher ionic conductivity at ILT range. Especially, SDC-carbonate composites show an ionic conductivity of 10 −2 to 1 Scm −1 between 400 and 600 °C in fuel cell environment. Some new cathode materials were investigated for above electrolyte materials and showed promising performance. Alternative anode materials were developed to directly utilize alcohol fuels. A Dry-Pressing and co-firing process was employed to fabricate thin SDC and BCSO electrolyte membranes as well as thick SDC-carbonate composite electrolyte with acceptable density on anode substrate. Many efforts have also been made on fabrication of larger-size planar cells and exploitation of reliable sealing materials.
