The Experts below are selected from a list of 204 Experts worldwide ranked by ideXlab platform

Lei Bi - One of the best experts on this subject based on the ideXlab platform.

  • Optimization of sintering temperature for SOFCs by a co-Firing Method
    Ceramics International, 2020
    Co-Authors: Qinfang Zhang, Lei Bi
    Abstract:

    Abstract A single-step co-Firing process is employed to fabricate solid oxide fuel cells (SOFCs) with an Sm-doped CeO2 (SDC) electrolyte, aiming to simplify the SOFC fabrication procedure. Complete tri layer green cells are co-fired in a single step at different fabrication temperatures, and the co-Firing temperature significantly influences the cell microstructure and thus influences its performance. Electrochemical investigations indicate that the cell resistance, including the ohmic and polarization resistance, varies with the co-Firing temperatures used and leads to a different cell power output. Although the cell polarization resistance follows the rule that higher Firing temperatures lead to higher polarization resistance values, the cell ohmic resistance does not follow the expectation that the cell fired at 1200 °C gives the largest ohmic resistance. The morphology analysis reveals the mechanism behind this phenomenon. The best cell performance is obtained by co-Firing the cell at 1000 °C, reaching 401 mW cm−2 at 700 °C.

  • tailoring cathode composite boosts the performance of proton conducting sofcs fabricated by a one step co Firing Method
    Journal of The European Ceramic Society, 2018
    Co-Authors: Eman Husni Daas, Shahid Pottachola Shafi, Huiqiang Wang, Lei Bi
    Abstract:

    Abstract A strategy of tailoring the ceramic cathode composite is presented to improve the performance of proton-conducting solid oxide fuel cells (SOFCs) prepared by a one-step co-Firing process. Comparing to the conventional way of using BaCe0.7Zr0.1Y0.2O3-δ (BCZY) in the composite cathode for BCZY-electrolyte based cells, the replacement of BCZY by BaZr0.8Y0.2O3-δ (BZY) mitigates the reaction between the two ceramic phases in the composite cathode during the co-Firing process and also keeps the cathode with sufficient porosity for ample gas diffusion which could assist in adequate cathode reactions. As a result, the BCZY-electrolyte based cell with Sm0.5Sr0.5CoO3-δ (SSC)-BZY composite cathode shows a power output of 300 mW cm−2 at 600 °C, which is the largest ever reported for proton-conducting SOFCs prepared by a one-step co-Firing process. The strategy of tailoring the composite cathode offers both small ohmic resistance and polarization resistance, providing a promising way to develop single-step co-fired proton-conducting SOFCs.

  • Tailoring sintering step allows high performance for solid oxide fuel cells prepared by a tri-layer co-Firing process
    Materials Research Bulletin, 2017
    Co-Authors: Shahid Pottachola Shafi, Shoucheng He, Lei Bi
    Abstract:

    Abstract A step sintering strategy is proposed to sinter the solid oxide fuel cell fabricated by the tri-layer co-Firing Method. Compared with the conventional sintering strategy for the tri-layer co-Firing Method which has to compromise the cathode performance with electrolyte densification, tailoring sintering steps allows the densification of electrolyte and the formation of an optimal cathode microstructure simultaneously, leading to a much enhanced electrochemical performance. The impedance analysis suggests that the desirable cathode microstructure achieved through the step sintering favors the cathode reaction, attaining a polarization resistance as low as 0.022 Ω cm2 at 700 °C which is about one third of that for the cell sintered by a conventional Method. The cell performance reaches 455 mW cm−2 at 700 °C by employing the step sintering strategy, while the cell performance measured is only 289 mW cm−2 with the conventional sintering approach.

  • Fabrication of cathode supported solid oxide fuel cell by multi-layer tape casting and co-Firing Method
    International Journal of Hydrogen Energy, 2009
    Co-Authors: Shangquan Zhang, Lei Bi, Lei Zhang, Chunli Yang, Haiqian Wang
    Abstract:

    Abstract La0.3Sr0.7FeO3-δ (LSF)/CeO2 cathode supported Ce0.8Sm0.2O2-δ (SDC) electrolyte was prepared by a simple multilayer tape casting and co-Firing Method. SDC electrolyte slurry and LSF/CeO2 cathode slurry were optimized and the green bi-layer tapes were co-fired at different temperature. Phase characterizations and microstructures of electrolyte and cathode were studied by X-ray diffraction (XRD) and Scan Electronic Microscopy (SEM). No additional phase peak line was observed in electrolyte and cathode support when the sintering temperature lower was than 1400 °C. The electrolytes were extremely dense with the thickness of about 20 μm. The cathode support was porous with electrical conductivity of about 4.21 S/cm at 750 °C. With Ni/SDC as anode, Open Current Voltage and maximum power density reached 0.61 V and 233 mW cm−2 at 750 °C, respectively.

  • Stable BaCe0.5Zr0.3Y0.16Zn0.04O3−δ thin membrane prepared by in situ tape casting for proton-conducting solid oxide fuel cells
    Journal of Power Sources, 2009
    Co-Authors: Shangquan Zhang, Lei Bi, Lei Zhang, Haiqian Wang
    Abstract:

    Abstract Stable BaCe0.5Zr0.3Y0.16Zn0.04O3−δ (BCZYZ) thin membrane was successfully prepared by in situ tape casting/co-Firing Method for proton-conducting solid oxide fuel cells. The starting powders were BaCO3, CeO2, ZrO2, Y2O3, ZnO for electrolyte and BaCO3, CeO2, ZrO2, Y2O3, ZnO, NiO, graphite for anode. The anode/electrolyte bi-layers were prepared by a simple multi-layer tape casting/co-Firing Method. The phase characterizations and microstructures were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The anode–electrolyte bi-layers were sintered at 1450 °C. The electrolytes were extremely dense with pure perovskite phase and the thickness was about 25 μm. The anodes were porous and no obvious reaction was found between NiO and BCZYZ. With LaSr3Co1.5Fe1.5O10−δ (LSCF)/BCZYZ as cathode, the open current voltage and maximum power density respectively, reached 1.00 V and 247 mW cm−2 at 650 °C.

Sanghoon Hyun - One of the best experts on this subject based on the ideXlab platform.

  • fabrication and characterization of planar type sofc unit cells using the tape casting lamination co Firing Method
    International Journal of Hydrogen Energy, 2012
    Co-Authors: Jaeha Myung, Hyun Jun Ko, Haegu Park, Moon Hwan, Sanghoon Hyun
    Abstract:

    Abstract In this study, solid oxide fuel cells (SOFCs) consisting of a NiO-YSZ anode, a NiO/YSZ-YSZ functional layer, YSZ electrolyte and a (La0.8Sr0.2)MnO3 + yttria-stabilized zirconia (LSM-YSZ) cathode were fabricated by tape-casting, lamination, and a co-Firing process. NiO/YSZ-YSZ nano-composite powder was synthesized for the anode functional layer via the Pechini process in order to improve cell performance. After optimization of the slurries for the anode functional anode, electrolyte and cathode, all components were casted so as to fabricate the monolithic laminate. The co-Firing temperature was optimized to minimize second phase formation between the (La0.8Sr0.2)MnO3 (LSM) and yttria-stabilized zirconia (YSZ) and to increase the sinterability of the YSZ electrolyte. The YSZ electrolyte was fully sintered with the addition of 0.5 wt% CuO, and the second phases of La2Zr2O7 and SrZrO3 did not form at 1350 °C. Ni-YSZ anode-supported unit cells were fabricated by co-Firing at 1250–1400 °C. The unit cells co-fired at 1250 °C, 1300 °C, 1325 °C, 1350 °C and 1400 °C had maximum power densities of 0.18, 0.18, 0.30, 0.46 and 0.036 W/cm2, respectively, in humidified hydrogen (∼3% H2O) and air at 800 °C.

  • Fabrication and characterization of planar-type SOFC unit cells using the tape-casting/lamination/co-Firing Method
    International Journal of Hydrogen Energy, 2012
    Co-Authors: Jaeha Myung, Hyun Jun Ko, Haegu Park, Moon Hwan, Sanghoon Hyun
    Abstract:

    Abstract In this study, solid oxide fuel cells (SOFCs) consisting of a NiO-YSZ anode, a NiO/YSZ-YSZ functional layer, YSZ electrolyte and a (La0.8Sr0.2)MnO3 + yttria-stabilized zirconia (LSM-YSZ) cathode were fabricated by tape-casting, lamination, and a co-Firing process. NiO/YSZ-YSZ nano-composite powder was synthesized for the anode functional layer via the Pechini process in order to improve cell performance. After optimization of the slurries for the anode functional anode, electrolyte and cathode, all components were casted so as to fabricate the monolithic laminate. The co-Firing temperature was optimized to minimize second phase formation between the (La0.8Sr0.2)MnO3 (LSM) and yttria-stabilized zirconia (YSZ) and to increase the sinterability of the YSZ electrolyte. The YSZ electrolyte was fully sintered with the addition of 0.5 wt% CuO, and the second phases of La2Zr2O7 and SrZrO3 did not form at 1350 °C. Ni-YSZ anode-supported unit cells were fabricated by co-Firing at 1250–1400 °C. The unit cells co-fired at 1250 °C, 1300 °C, 1325 °C, 1350 °C and 1400 °C had maximum power densities of 0.18, 0.18, 0.30, 0.46 and 0.036 W/cm2, respectively, in humidified hydrogen (∼3% H2O) and air at 800 °C.

Moon Hwan - One of the best experts on this subject based on the ideXlab platform.

  • fabrication and characterization of planar type sofc unit cells using the tape casting lamination co Firing Method
    International Journal of Hydrogen Energy, 2012
    Co-Authors: Jaeha Myung, Hyun Jun Ko, Haegu Park, Moon Hwan, Sanghoon Hyun
    Abstract:

    Abstract In this study, solid oxide fuel cells (SOFCs) consisting of a NiO-YSZ anode, a NiO/YSZ-YSZ functional layer, YSZ electrolyte and a (La0.8Sr0.2)MnO3 + yttria-stabilized zirconia (LSM-YSZ) cathode were fabricated by tape-casting, lamination, and a co-Firing process. NiO/YSZ-YSZ nano-composite powder was synthesized for the anode functional layer via the Pechini process in order to improve cell performance. After optimization of the slurries for the anode functional anode, electrolyte and cathode, all components were casted so as to fabricate the monolithic laminate. The co-Firing temperature was optimized to minimize second phase formation between the (La0.8Sr0.2)MnO3 (LSM) and yttria-stabilized zirconia (YSZ) and to increase the sinterability of the YSZ electrolyte. The YSZ electrolyte was fully sintered with the addition of 0.5 wt% CuO, and the second phases of La2Zr2O7 and SrZrO3 did not form at 1350 °C. Ni-YSZ anode-supported unit cells were fabricated by co-Firing at 1250–1400 °C. The unit cells co-fired at 1250 °C, 1300 °C, 1325 °C, 1350 °C and 1400 °C had maximum power densities of 0.18, 0.18, 0.30, 0.46 and 0.036 W/cm2, respectively, in humidified hydrogen (∼3% H2O) and air at 800 °C.

  • Fabrication and characterization of planar-type SOFC unit cells using the tape-casting/lamination/co-Firing Method
    International Journal of Hydrogen Energy, 2012
    Co-Authors: Jaeha Myung, Hyun Jun Ko, Haegu Park, Moon Hwan, Sanghoon Hyun
    Abstract:

    Abstract In this study, solid oxide fuel cells (SOFCs) consisting of a NiO-YSZ anode, a NiO/YSZ-YSZ functional layer, YSZ electrolyte and a (La0.8Sr0.2)MnO3 + yttria-stabilized zirconia (LSM-YSZ) cathode were fabricated by tape-casting, lamination, and a co-Firing process. NiO/YSZ-YSZ nano-composite powder was synthesized for the anode functional layer via the Pechini process in order to improve cell performance. After optimization of the slurries for the anode functional anode, electrolyte and cathode, all components were casted so as to fabricate the monolithic laminate. The co-Firing temperature was optimized to minimize second phase formation between the (La0.8Sr0.2)MnO3 (LSM) and yttria-stabilized zirconia (YSZ) and to increase the sinterability of the YSZ electrolyte. The YSZ electrolyte was fully sintered with the addition of 0.5 wt% CuO, and the second phases of La2Zr2O7 and SrZrO3 did not form at 1350 °C. Ni-YSZ anode-supported unit cells were fabricated by co-Firing at 1250–1400 °C. The unit cells co-fired at 1250 °C, 1300 °C, 1325 °C, 1350 °C and 1400 °C had maximum power densities of 0.18, 0.18, 0.30, 0.46 and 0.036 W/cm2, respectively, in humidified hydrogen (∼3% H2O) and air at 800 °C.

Jaeha Myung - One of the best experts on this subject based on the ideXlab platform.

  • fabrication and characterization of planar type sofc unit cells using the tape casting lamination co Firing Method
    International Journal of Hydrogen Energy, 2012
    Co-Authors: Jaeha Myung, Hyun Jun Ko, Haegu Park, Moon Hwan, Sanghoon Hyun
    Abstract:

    Abstract In this study, solid oxide fuel cells (SOFCs) consisting of a NiO-YSZ anode, a NiO/YSZ-YSZ functional layer, YSZ electrolyte and a (La0.8Sr0.2)MnO3 + yttria-stabilized zirconia (LSM-YSZ) cathode were fabricated by tape-casting, lamination, and a co-Firing process. NiO/YSZ-YSZ nano-composite powder was synthesized for the anode functional layer via the Pechini process in order to improve cell performance. After optimization of the slurries for the anode functional anode, electrolyte and cathode, all components were casted so as to fabricate the monolithic laminate. The co-Firing temperature was optimized to minimize second phase formation between the (La0.8Sr0.2)MnO3 (LSM) and yttria-stabilized zirconia (YSZ) and to increase the sinterability of the YSZ electrolyte. The YSZ electrolyte was fully sintered with the addition of 0.5 wt% CuO, and the second phases of La2Zr2O7 and SrZrO3 did not form at 1350 °C. Ni-YSZ anode-supported unit cells were fabricated by co-Firing at 1250–1400 °C. The unit cells co-fired at 1250 °C, 1300 °C, 1325 °C, 1350 °C and 1400 °C had maximum power densities of 0.18, 0.18, 0.30, 0.46 and 0.036 W/cm2, respectively, in humidified hydrogen (∼3% H2O) and air at 800 °C.

  • Fabrication and characterization of planar-type SOFC unit cells using the tape-casting/lamination/co-Firing Method
    International Journal of Hydrogen Energy, 2012
    Co-Authors: Jaeha Myung, Hyun Jun Ko, Haegu Park, Moon Hwan, Sanghoon Hyun
    Abstract:

    Abstract In this study, solid oxide fuel cells (SOFCs) consisting of a NiO-YSZ anode, a NiO/YSZ-YSZ functional layer, YSZ electrolyte and a (La0.8Sr0.2)MnO3 + yttria-stabilized zirconia (LSM-YSZ) cathode were fabricated by tape-casting, lamination, and a co-Firing process. NiO/YSZ-YSZ nano-composite powder was synthesized for the anode functional layer via the Pechini process in order to improve cell performance. After optimization of the slurries for the anode functional anode, electrolyte and cathode, all components were casted so as to fabricate the monolithic laminate. The co-Firing temperature was optimized to minimize second phase formation between the (La0.8Sr0.2)MnO3 (LSM) and yttria-stabilized zirconia (YSZ) and to increase the sinterability of the YSZ electrolyte. The YSZ electrolyte was fully sintered with the addition of 0.5 wt% CuO, and the second phases of La2Zr2O7 and SrZrO3 did not form at 1350 °C. Ni-YSZ anode-supported unit cells were fabricated by co-Firing at 1250–1400 °C. The unit cells co-fired at 1250 °C, 1300 °C, 1325 °C, 1350 °C and 1400 °C had maximum power densities of 0.18, 0.18, 0.30, 0.46 and 0.036 W/cm2, respectively, in humidified hydrogen (∼3% H2O) and air at 800 °C.

Hyun Jun Ko - One of the best experts on this subject based on the ideXlab platform.

  • fabrication and characterization of planar type sofc unit cells using the tape casting lamination co Firing Method
    International Journal of Hydrogen Energy, 2012
    Co-Authors: Jaeha Myung, Hyun Jun Ko, Haegu Park, Moon Hwan, Sanghoon Hyun
    Abstract:

    Abstract In this study, solid oxide fuel cells (SOFCs) consisting of a NiO-YSZ anode, a NiO/YSZ-YSZ functional layer, YSZ electrolyte and a (La0.8Sr0.2)MnO3 + yttria-stabilized zirconia (LSM-YSZ) cathode were fabricated by tape-casting, lamination, and a co-Firing process. NiO/YSZ-YSZ nano-composite powder was synthesized for the anode functional layer via the Pechini process in order to improve cell performance. After optimization of the slurries for the anode functional anode, electrolyte and cathode, all components were casted so as to fabricate the monolithic laminate. The co-Firing temperature was optimized to minimize second phase formation between the (La0.8Sr0.2)MnO3 (LSM) and yttria-stabilized zirconia (YSZ) and to increase the sinterability of the YSZ electrolyte. The YSZ electrolyte was fully sintered with the addition of 0.5 wt% CuO, and the second phases of La2Zr2O7 and SrZrO3 did not form at 1350 °C. Ni-YSZ anode-supported unit cells were fabricated by co-Firing at 1250–1400 °C. The unit cells co-fired at 1250 °C, 1300 °C, 1325 °C, 1350 °C and 1400 °C had maximum power densities of 0.18, 0.18, 0.30, 0.46 and 0.036 W/cm2, respectively, in humidified hydrogen (∼3% H2O) and air at 800 °C.

  • Fabrication and characterization of planar-type SOFC unit cells using the tape-casting/lamination/co-Firing Method
    International Journal of Hydrogen Energy, 2012
    Co-Authors: Jaeha Myung, Hyun Jun Ko, Haegu Park, Moon Hwan, Sanghoon Hyun
    Abstract:

    Abstract In this study, solid oxide fuel cells (SOFCs) consisting of a NiO-YSZ anode, a NiO/YSZ-YSZ functional layer, YSZ electrolyte and a (La0.8Sr0.2)MnO3 + yttria-stabilized zirconia (LSM-YSZ) cathode were fabricated by tape-casting, lamination, and a co-Firing process. NiO/YSZ-YSZ nano-composite powder was synthesized for the anode functional layer via the Pechini process in order to improve cell performance. After optimization of the slurries for the anode functional anode, electrolyte and cathode, all components were casted so as to fabricate the monolithic laminate. The co-Firing temperature was optimized to minimize second phase formation between the (La0.8Sr0.2)MnO3 (LSM) and yttria-stabilized zirconia (YSZ) and to increase the sinterability of the YSZ electrolyte. The YSZ electrolyte was fully sintered with the addition of 0.5 wt% CuO, and the second phases of La2Zr2O7 and SrZrO3 did not form at 1350 °C. Ni-YSZ anode-supported unit cells were fabricated by co-Firing at 1250–1400 °C. The unit cells co-fired at 1250 °C, 1300 °C, 1325 °C, 1350 °C and 1400 °C had maximum power densities of 0.18, 0.18, 0.30, 0.46 and 0.036 W/cm2, respectively, in humidified hydrogen (∼3% H2O) and air at 800 °C.