The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform

Qiuwang Wang - One of the best experts on this subject based on the ideXlab platform.

  • Effect of bi-layer Interconnector design on mass transfer performance in porous anode of solid oxide fuel cells
    International Journal of Heat and Mass Transfer, 2020
    Co-Authors: Qiuyang Chen, Qiuwang Wang, Jian Zhang, Jinliang Yuan
    Abstract:

    We propose a novel Interconnector design, termed bi-layer Interconnector, for solid oxide fuel cells (SOFCs). It can disturb the fuel gas and air on the planes normal to the SOFC three-phase-boundary (TPB) layer. In this paper, a two-dimensional half-cell model is developed to study the concentration overpotentials in the fuel side of the SOFC stack with conventional and novel bi-layer Interconnectors. The numerical results show that the novel bi-layer Interconnector can increase the velocity of the fuel gas in the porous anode. The results of mole fraction distribution illustrate that the novel bi-layer Interconnector can effectively disturb the fuel flow. The average H-2 mole fraction in the porous anode of SOFC with bi-layer Interconnector is about 4.7% higher than that of conventional SOFC. The average H-2 mole fraction at TPB interface is about 9.2% higher. The concentration overpotential of the novel SOFC design is lower than that of the conventional SOFC design by 5%. It can enhance the mass transfer in porous electrode and improve the performance of SOFC. (C) 2011 Elsevier Ltd. All rights reserved

  • Mass transfer enhancement of a spiral-like Interconnector for planar solid oxide fuel cells
    Applied Energy, 2015
    Co-Authors: Pei Fu, Min Zeng, Xiang Li, Qiuwang Wang
    Abstract:

    In order to mitigate the fuel shortage in porous electrode of planar Solid Oxide Fuel Cell (SOFC), this work presents a novel spiral-like SOFC Interconnector which could achieve a tight gas sealing and sufficient electrical contact between the Interconnector and electrode or gas supply line. A naphthalene sublimation mass transfer experiment at room temperature is applied to verify the superiority of the new structure. A 3-D model is set up by COMSOL 3.5A and the cell is operated with the mixture of H2 and H2O as fuel at 1023K. The experimental results and simulation results show that this new structure could improve the mass transfer performance of SOFC greatly. Comparing with traditional direct channel Interconnector, this new design could not only improve the gas velocity in porous electrode which parallel to the triple phase boundary (TPB), but also enhance the gas velocity perpendicular to it. The H2 molar fraction in porous anode with this spiral-like Interconnector is almost two orders of magnitude higher than that with direct channel Interconnector both at room temperature and high temperature. These improvements would be helpful to increase the fuel availability and enhance the electrical performance of SOFCs.

  • Numerical Study on Mass Transfer Performance of a Spiral-like Interconnector for Planner Solid Oxide Fuel Cells
    Energy Procedia, 2015
    Co-Authors: Min Zeng, Ting Ma, Pei Fu, Qiuwang Wang
    Abstract:

    Abstract In order to transfer more fuel of a planner SOFC (Solid Oxide Fuel Cell) from gas channel into porous anode, this paper has designed a novel spiral-like SOFC Interconnector, a 3-D model is made by COMSOL 3.5a and the cell was operated with the mixture of H2 and H2O as fuel at 1023K. The result shows that, compared with conventional direct channel Interconnectors, the new Interconnector in this paper could not only improve the gas velocity parallel to the TPB(Triple Phase Boundary), but also with much higher gas velocity perpendicular to it, which has led to the H2 molar fraction close to the TPB in anode is almost two orders of magnitude higher than that of director channel Interconnector SOFC, which would be helpful to improve the electrical performance of SOFCs.

  • Electrical Performance and Carbon Deposition Differences between the Bi-Layer Interconnector and Conventional Straight Interconnector Solid Oxide Fuel Cell
    Energies, 2014
    Co-Authors: Pei Fu, Qiuyang Chen, Qiuwang Wang, Min Zeng, Jaideep Pandit
    Abstract:

    Carbon deposition considered in a solid oxide fuel cell (SOFC) model may be influenced by the operating voltage, inlet water/methane ratio, working temperature and pressure, inlet molar fraction of fuel and so on. The effects of these parameters in a planar SOFC implementing a novel bi-layer Interconnector are not well understood. This paper is focused on the numerical study of carbon deposition and electrical performance of a bi-layer Interconnector planar SOFC. The results illustrate that the electrical performance of the bi-layer Interconnector SOFC is 11% higher than that of the conventional straight Interconnector SOFC with initial state. After 120 days of operation, the electrical performance of the bi-layer Interconnector SOFC has a slight decrease and more carbon deposit because of the increased electrochemical reaction rate. However, these differences minimize if higher operating voltages are involved.

  • optimal design of bi layer Interconnector for sofc based on cfd taguchi method
    International Journal of Hydrogen Energy, 2010
    Co-Authors: Qiuyang Chen, Jian Zhang, Min Zeng, Qiuwang Wang
    Abstract:

    In order to reduce the concentration polarization of SOFC, a novel SOFC with bi-layer Interconnector is presented. This novel bi-layer Interconnector can disturb the fuel and air gas flow in the direction which is normal to the SOFC triple-layer and enhance the mass transfer effectively. In this paper, the effect of bi-layer Interconnector on the performance of SOFC is investigated with computational fluid dynamics (CFD) method. Three controllable parameters of Interconnector are considered. Each parameter has five levels. The Taguchi method is used as a systematic approach to plan and analyze the CFD results. The numerical results show that the novel Interconnector can enhance the mass transfer in porous electrode, reduce the concentration polarization of SOFC, and improve the performance of SOFC. The Taguchi method can reduce the calculation model amount and the calculation time significantly. The optimal levels of controllable parameters for bi-layer interconnects are determined. The contribution ratio of rib height H is the most significant one, for which more attention should be paid during the design and operation stages.

Shaorong Wang - One of the best experts on this subject based on the ideXlab platform.

  • performance of an anode supported tubular solid oxide fuel cells stack with two single cells connected by a co sintered ceramic Interconnector
    International Journal of Hydrogen Energy, 2011
    Co-Authors: Yanjie Xu, Shaorong Wang, Le Shao
    Abstract:

    Abstract Two anode-supported tubular solid oxide fuel cells (SOFCs) have been connected by a co-sintered ceramic Interconnector to form a stack. This novel bilayered ceramic Interconnector consists of La-doped SrTiO 3 (La 0.4 Sr 0.6 TiO 3 ) and Sr-doped lanthanum manganite (La 0.8 Sr 0.2 MnO 3 ), which is fabricated by co-sintering with green anode at 1380 °C for 3 h. La 0.4 Sr 0.6 TiO 3 (LST) acts as a barrier avoiding the outward diffusion of H 2 to the cathode; while La 0.8 Sr 0.2 MnO 3 (LSM) prevents O 2 from diffusing inward to the anode. The compatibility of LST and LSM, as well as their microstructure which co-sintered with anode are both studied. The resistances between anode and LST/LSM Interconnector at different temperatures are determined by AC impedance spectra. The results have showed that the bilayered LST/LSM is adequate for SOFC Interconnector application. The active area is 2 cm 2 for Interconnector and 16 cm 2 for the total cathode of the stack. When operating at 900 °C, 850 °C, 800 °C with H 2 as fuel and O 2 as oxidant, the maximum power density of the stack are 353 mW cm −2 , 285 mW cm −2 and 237.5 mW cm −2 , respectively, i.e., approximately 80% power output efficiency can be achieved compared with the total of the two single cells.

  • a novel bilayered sr0 6la0 4tio3 la0 8sr0 2mno3 Interconnector for anode supported tubular solid oxide fuel cell via slurry brushing and co sintering process
    Journal of Power Sources, 2011
    Co-Authors: Yanjie Xu, Shaorong Wang
    Abstract:

    Abstract Considering that conventional lanthanum chromate (LaCrO 3 ) Interconnector is hard to be co-sintered with green anode, we have fabricated a novel bilayered Interconnector which consists of La-doped SrTiO 3 (Sr 0.6 La 0.4 TiO 3 ) and Sr-doped lanthanum manganite (La 0.8 Sr 0.2 MnO 3 ). Sr 0.6 La 0.4 TiO 3 is conductive and stable in reducing atmosphere, locating on the anode side; while La 0.8 Sr 0.2 MnO 3 is on the cathode side. A slurry-brushing and co-sintering method is applied: the Sr 0.6 La 0.4 TiO 3 and La 0.8 Sr 0.2 MnO 3 slurries are successively brushed onto green anode specimen, followed by co-firing course to form a dense bilayered Sr 0.6 La 0.4 TiO 3 /La 0.8 Sr 0.2 MnO 3 Interconnector. For operating with humidified hydrogen and oxygen at 900 °C, the ohmic resistances between anode and cathode/Interconnector are 0.33 Ω cm 2 and 0.186 Ω cm 2 , respectively. The maximum power density is 290 mW cm −2 for a cell with Interconnector, and 420 mW cm −2 for a cell without it, which demonstrates that nearly 70% of the power output can be achieved using this bilayered Sr 0.6 La 0.4 TiO 3 /La 0.8 Sr 0.2 MnO 3 Interconnector.

  • A novel bilayered Sr0.6La0.4TiO3/La0.8Sr0.2MnO3 Interconnector for anode-supported tubular solid oxide fuel cell via slurry-brushing and co-sintering process
    Journal of Power Sources, 2011
    Co-Authors: Yanjie Xu, Shaorong Wang
    Abstract:

    Abstract Considering that conventional lanthanum chromate (LaCrO 3 ) Interconnector is hard to be co-sintered with green anode, we have fabricated a novel bilayered Interconnector which consists of La-doped SrTiO 3 (Sr 0.6 La 0.4 TiO 3 ) and Sr-doped lanthanum manganite (La 0.8 Sr 0.2 MnO 3 ). Sr 0.6 La 0.4 TiO 3 is conductive and stable in reducing atmosphere, locating on the anode side; while La 0.8 Sr 0.2 MnO 3 is on the cathode side. A slurry-brushing and co-sintering method is applied: the Sr 0.6 La 0.4 TiO 3 and La 0.8 Sr 0.2 MnO 3 slurries are successively brushed onto green anode specimen, followed by co-firing course to form a dense bilayered Sr 0.6 La 0.4 TiO 3 /La 0.8 Sr 0.2 MnO 3 Interconnector. For operating with humidified hydrogen and oxygen at 900 °C, the ohmic resistances between anode and cathode/Interconnector are 0.33 Ω cm 2 and 0.186 Ω cm 2 , respectively. The maximum power density is 290 mW cm −2 for a cell with Interconnector, and 420 mW cm −2 for a cell without it, which demonstrates that nearly 70% of the power output can be achieved using this bilayered Sr 0.6 La 0.4 TiO 3 /La 0.8 Sr 0.2 MnO 3 Interconnector.

Yanjie Xu - One of the best experts on this subject based on the ideXlab platform.

  • performance of an anode supported tubular solid oxide fuel cells stack with two single cells connected by a co sintered ceramic Interconnector
    International Journal of Hydrogen Energy, 2011
    Co-Authors: Yanjie Xu, Shaorong Wang, Le Shao
    Abstract:

    Abstract Two anode-supported tubular solid oxide fuel cells (SOFCs) have been connected by a co-sintered ceramic Interconnector to form a stack. This novel bilayered ceramic Interconnector consists of La-doped SrTiO 3 (La 0.4 Sr 0.6 TiO 3 ) and Sr-doped lanthanum manganite (La 0.8 Sr 0.2 MnO 3 ), which is fabricated by co-sintering with green anode at 1380 °C for 3 h. La 0.4 Sr 0.6 TiO 3 (LST) acts as a barrier avoiding the outward diffusion of H 2 to the cathode; while La 0.8 Sr 0.2 MnO 3 (LSM) prevents O 2 from diffusing inward to the anode. The compatibility of LST and LSM, as well as their microstructure which co-sintered with anode are both studied. The resistances between anode and LST/LSM Interconnector at different temperatures are determined by AC impedance spectra. The results have showed that the bilayered LST/LSM is adequate for SOFC Interconnector application. The active area is 2 cm 2 for Interconnector and 16 cm 2 for the total cathode of the stack. When operating at 900 °C, 850 °C, 800 °C with H 2 as fuel and O 2 as oxidant, the maximum power density of the stack are 353 mW cm −2 , 285 mW cm −2 and 237.5 mW cm −2 , respectively, i.e., approximately 80% power output efficiency can be achieved compared with the total of the two single cells.

  • a novel bilayered sr0 6la0 4tio3 la0 8sr0 2mno3 Interconnector for anode supported tubular solid oxide fuel cell via slurry brushing and co sintering process
    Journal of Power Sources, 2011
    Co-Authors: Yanjie Xu, Shaorong Wang
    Abstract:

    Abstract Considering that conventional lanthanum chromate (LaCrO 3 ) Interconnector is hard to be co-sintered with green anode, we have fabricated a novel bilayered Interconnector which consists of La-doped SrTiO 3 (Sr 0.6 La 0.4 TiO 3 ) and Sr-doped lanthanum manganite (La 0.8 Sr 0.2 MnO 3 ). Sr 0.6 La 0.4 TiO 3 is conductive and stable in reducing atmosphere, locating on the anode side; while La 0.8 Sr 0.2 MnO 3 is on the cathode side. A slurry-brushing and co-sintering method is applied: the Sr 0.6 La 0.4 TiO 3 and La 0.8 Sr 0.2 MnO 3 slurries are successively brushed onto green anode specimen, followed by co-firing course to form a dense bilayered Sr 0.6 La 0.4 TiO 3 /La 0.8 Sr 0.2 MnO 3 Interconnector. For operating with humidified hydrogen and oxygen at 900 °C, the ohmic resistances between anode and cathode/Interconnector are 0.33 Ω cm 2 and 0.186 Ω cm 2 , respectively. The maximum power density is 290 mW cm −2 for a cell with Interconnector, and 420 mW cm −2 for a cell without it, which demonstrates that nearly 70% of the power output can be achieved using this bilayered Sr 0.6 La 0.4 TiO 3 /La 0.8 Sr 0.2 MnO 3 Interconnector.

  • A novel bilayered Sr0.6La0.4TiO3/La0.8Sr0.2MnO3 Interconnector for anode-supported tubular solid oxide fuel cell via slurry-brushing and co-sintering process
    Journal of Power Sources, 2011
    Co-Authors: Yanjie Xu, Shaorong Wang
    Abstract:

    Abstract Considering that conventional lanthanum chromate (LaCrO 3 ) Interconnector is hard to be co-sintered with green anode, we have fabricated a novel bilayered Interconnector which consists of La-doped SrTiO 3 (Sr 0.6 La 0.4 TiO 3 ) and Sr-doped lanthanum manganite (La 0.8 Sr 0.2 MnO 3 ). Sr 0.6 La 0.4 TiO 3 is conductive and stable in reducing atmosphere, locating on the anode side; while La 0.8 Sr 0.2 MnO 3 is on the cathode side. A slurry-brushing and co-sintering method is applied: the Sr 0.6 La 0.4 TiO 3 and La 0.8 Sr 0.2 MnO 3 slurries are successively brushed onto green anode specimen, followed by co-firing course to form a dense bilayered Sr 0.6 La 0.4 TiO 3 /La 0.8 Sr 0.2 MnO 3 Interconnector. For operating with humidified hydrogen and oxygen at 900 °C, the ohmic resistances between anode and cathode/Interconnector are 0.33 Ω cm 2 and 0.186 Ω cm 2 , respectively. The maximum power density is 290 mW cm −2 for a cell with Interconnector, and 420 mW cm −2 for a cell without it, which demonstrates that nearly 70% of the power output can be achieved using this bilayered Sr 0.6 La 0.4 TiO 3 /La 0.8 Sr 0.2 MnO 3 Interconnector.

Min Zeng - One of the best experts on this subject based on the ideXlab platform.

  • Mass transfer enhancement of a spiral-like Interconnector for planar solid oxide fuel cells
    Applied Energy, 2015
    Co-Authors: Pei Fu, Min Zeng, Xiang Li, Qiuwang Wang
    Abstract:

    In order to mitigate the fuel shortage in porous electrode of planar Solid Oxide Fuel Cell (SOFC), this work presents a novel spiral-like SOFC Interconnector which could achieve a tight gas sealing and sufficient electrical contact between the Interconnector and electrode or gas supply line. A naphthalene sublimation mass transfer experiment at room temperature is applied to verify the superiority of the new structure. A 3-D model is set up by COMSOL 3.5A and the cell is operated with the mixture of H2 and H2O as fuel at 1023K. The experimental results and simulation results show that this new structure could improve the mass transfer performance of SOFC greatly. Comparing with traditional direct channel Interconnector, this new design could not only improve the gas velocity in porous electrode which parallel to the triple phase boundary (TPB), but also enhance the gas velocity perpendicular to it. The H2 molar fraction in porous anode with this spiral-like Interconnector is almost two orders of magnitude higher than that with direct channel Interconnector both at room temperature and high temperature. These improvements would be helpful to increase the fuel availability and enhance the electrical performance of SOFCs.

  • Numerical Study on Mass Transfer Performance of a Spiral-like Interconnector for Planner Solid Oxide Fuel Cells
    Energy Procedia, 2015
    Co-Authors: Min Zeng, Ting Ma, Pei Fu, Qiuwang Wang
    Abstract:

    Abstract In order to transfer more fuel of a planner SOFC (Solid Oxide Fuel Cell) from gas channel into porous anode, this paper has designed a novel spiral-like SOFC Interconnector, a 3-D model is made by COMSOL 3.5a and the cell was operated with the mixture of H2 and H2O as fuel at 1023K. The result shows that, compared with conventional direct channel Interconnectors, the new Interconnector in this paper could not only improve the gas velocity parallel to the TPB(Triple Phase Boundary), but also with much higher gas velocity perpendicular to it, which has led to the H2 molar fraction close to the TPB in anode is almost two orders of magnitude higher than that of director channel Interconnector SOFC, which would be helpful to improve the electrical performance of SOFCs.

  • Electrical Performance and Carbon Deposition Differences between the Bi-Layer Interconnector and Conventional Straight Interconnector Solid Oxide Fuel Cell
    Energies, 2014
    Co-Authors: Pei Fu, Qiuyang Chen, Qiuwang Wang, Min Zeng, Jaideep Pandit
    Abstract:

    Carbon deposition considered in a solid oxide fuel cell (SOFC) model may be influenced by the operating voltage, inlet water/methane ratio, working temperature and pressure, inlet molar fraction of fuel and so on. The effects of these parameters in a planar SOFC implementing a novel bi-layer Interconnector are not well understood. This paper is focused on the numerical study of carbon deposition and electrical performance of a bi-layer Interconnector planar SOFC. The results illustrate that the electrical performance of the bi-layer Interconnector SOFC is 11% higher than that of the conventional straight Interconnector SOFC with initial state. After 120 days of operation, the electrical performance of the bi-layer Interconnector SOFC has a slight decrease and more carbon deposit because of the increased electrochemical reaction rate. However, these differences minimize if higher operating voltages are involved.

  • optimal design of bi layer Interconnector for sofc based on cfd taguchi method
    International Journal of Hydrogen Energy, 2010
    Co-Authors: Qiuyang Chen, Jian Zhang, Min Zeng, Qiuwang Wang
    Abstract:

    In order to reduce the concentration polarization of SOFC, a novel SOFC with bi-layer Interconnector is presented. This novel bi-layer Interconnector can disturb the fuel and air gas flow in the direction which is normal to the SOFC triple-layer and enhance the mass transfer effectively. In this paper, the effect of bi-layer Interconnector on the performance of SOFC is investigated with computational fluid dynamics (CFD) method. Three controllable parameters of Interconnector are considered. Each parameter has five levels. The Taguchi method is used as a systematic approach to plan and analyze the CFD results. The numerical results show that the novel Interconnector can enhance the mass transfer in porous electrode, reduce the concentration polarization of SOFC, and improve the performance of SOFC. The Taguchi method can reduce the calculation model amount and the calculation time significantly. The optimal levels of controllable parameters for bi-layer interconnects are determined. The contribution ratio of rib height H is the most significant one, for which more attention should be paid during the design and operation stages.

  • Effect of Bi-Layer Interconnector Design on the Current Density of Solid Oxide Fuel Cells
    ASME 2009 7th International Conference on Fuel Cell Science Engineering and Technology, 2009
    Co-Authors: Qiuyang Chen, Qiuwang Wang, Jian Zhang, Min Zeng
    Abstract:

    The concentration gradient of fuel and oxidant gas is great in the plane normal to the solid oxide fuel cells (SOFC) three-phase-boundary (TPB) layer, especially in the porous electrode. We present a novel Interconnector design, termed bilayer Interconnector, for SOFC. It can distribute the fuel and air gas in the plane normal to the SOFC TPB layer. In this paper, we develop a 3D model to study the current density of the SOFC with conventional and novel bi-layer Interconnectors. The numerical results show that the novel SOFC design Rib1 can slightly enhance the mass transfer in the porous anode and current density. The novel SOFC design Rib2 can improve the current density significantly under low electrical conductivity of Interconnector.© 2009 ASME

Jianxin Tang - One of the best experts on this subject based on the ideXlab platform.

  • electric field assisted charge generation and separation process in transition metal oxide based Interconnectors for tandem organic light emitting diodes
    Advanced Functional Materials, 2012
    Co-Authors: Jinpeng Yang, Yan Xiao, Yanhong Deng, Steffen Duhm, Nobuo Ueno, Yanqing Li, Jianxin Tang
    Abstract:

    The charge generation and separation process in transition metal oxide (TMO)-based Interconnectors for tandem organic light-emitting diodes (OLEDs) is explored using data on electrical and spectral emission properties, interface energetics, and capacitance characteristics. The TMO-based Interconnector is composed of MoO3 and cesium azide (CsN3)-doped 4,7-diphenyl-1,10-phenanthroline (BPhen) layers, where CsN3 is employed to replace the reactive metals as an n-dopant due to its air stability and low deposition temperature. Experimental evidences identify that spontaneous electron transfer occurs in a vacuum-deposited MoO3 layer from various defect states to the conduction band via thermal diffusion. The external electric-field induces the charge separation through tunneling of generated electrons and holes from MoO3 into the neighboring CsN3-doped BPhen and hole-transporting layers, respectively. Moreover, the impacts of constituent materials on the functional effectiveness of TMO-based Interconnectors and their influences on carrier recombination processes for light emission have also been addressed.