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  • 1. Hu, Huiging
    et al.
    Lin, Qizhao
    Zhu, Zhigang
    Liu, Xiangrong
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Zhu, Bin
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
    Time-dependent performance change of single layer fuel cell with Li0.4Mg0.3Zn0.3O/Ce0.8Sm0.2O2-delta composite2014In: International journal of hydrogen energy, ISSN 0360-3199, E-ISSN 1879-3487, Vol. 39, no 20, p. 10718-10723Article in journal (Refereed)
    Abstract [en]

    A Large-size engineering single layer fuel cell (SLFC) consisting of a nano-structured Li0.4Mg0.3Zn0.3O2-delta/Ce0.8Sm0.2O2-delta (LMZSDC) composite with an active area of 25 cm(2) (6 cm x 6 cm x 0.1 cm) is successfully fabricated. The SLFC is evaluated by testing the cell durability with a time-dependent degradation using an H-2 fuel and an air oxidant at 600 degrees C for over 120 h. A maximum power of 12.8 W (512 mW cm(-2)) is achieved at 600 degrees C. In the initial operation stage around 50 h, the cell's performance decreases from 12.8 to 11.2 W; however, after this point, the performance was consistently stable, and no significant degradation is observed in the current density or the cell performance. The device performed excellently at low temperatures with a delivered power output of more than 250 mW cm(-2) at a temperature as low as 400 degrees C. By curve fitting the X-ray photoelectron spectroscopy (XPS) results, the ratio of Ce3+/(Ce3++Ce4+) before and after the long-time operation is analyzed. The ratio increased from 28.2% to 31.4% in the electrolyte which indicates a reduction occurs in the beginning operation that causes an initial performance loss for the device power output and OCV. Electrochemical impedance analyses indicate that the LMZSDC had a high ionic transport, and the device had quick dynamic processes and, thus, a high fuel cell performance. The LMZSDC is a new type of ionic material that has been successfully applied to SLFCs.

  • 2. Hu, Huiqing
    et al.
    Lin, Qizhao
    Liu, Xiangrong
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
    Zhu, Bin
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
    Scaled up low-temperature SOFCs with symmetrical electrode for applications2015In: Journal of Solid State Electrochemistry, ISSN 1432-8488, E-ISSN 1433-0768, Vol. 19, no 8, p. 2361-2368Article in journal (Refereed)
    Abstract [en]

    In this study, a new type of the Mg0.4Zn0.6O/Ce0.8Sm0.2O2-delta (MZSDC) composite electrolyte was synthesized using a co-precipitation method. Large-sized engineering cells have been fabricated and tested to meet the demands of applications. X-ray diffraction scanning electron microscopy and X-ray photoelectron spectroscopy have been employed to characterize the microstructure and the morphology of the synthesized samples. MZSDC is a composite system. X-ray electron spectroscopy shows that Ce (3d) binding energy shifted from high to low and the ratio of Ce3+ decreased in comparison to pure CeO2, due to the doping effect. The doping and composite caused the material to have an excellent electrical property, 0.089 S center dot cm(-1), and device performance, with a maximum power of 16.4 W (648 mW center dot cm(-2)) achieved at 600 A degrees C for a larger-sized (6 cm x 6 cm x 1 mm) fuel cell. The open circuit voltage and power of the fuel cell only slightly degrades (less than 1 %) after continually tested for 100 h. This is the first report regarding the large size engineering cell performance for using this new composite electrolyte with both excellent performance and low cost.

  • 3. Hu, Huiqing
    et al.
    Lin, Qizhao
    Zhu, Zhigang
    Liu, Xiangrong
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
    Afzal, Muhammad
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
    He, Yunjuan
    Zhu, Bin
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology. Hubei Univ, Fac Phys & Elect Technol, Hubei Collaborat Innovat Ctr Adv Mat, Wuhan 430062, Hubei, Peoples R China.
    Effects of composition on the electrochemical property and cell performance of single layer fuel cell2015In: Journal of Power Sources, ISSN 0378-7753, E-ISSN 1873-2755, Vol. 275, p. 476-482Article in journal (Refereed)
    Abstract [en]

    In this study, the enhanced electrochemical performance of single layer fuel cells (SLFCs) based upon mixed ion and electron conductors is analyzed as a function of composition. We synthesize a series of Ce0.8Sm0.2O2-delta-Li0.3Ni0.6Cu0.07Sr0.03O2-delta (SDC-LNCS) with different weight ratios. The microstructure and morphology of the composite materials are characterized through X-ray diffraction (XRD), transmission electron microscope (TEM), and energy-dispersive X-ray spectrometer (EDS). Stability of the synthesized samples is evaluated by thermal gravity analysis (TGA). The SLFC with 6SDC-4LNCS exhibits a uniform distribution of the two compositions as well as demonstrates the highest power density of 312 mW cm-2 at 550 mu C. The performance is correlated to the balance of the conduction properties (ionic and electronic) of the functional SLFC layer. The results are a critical contribution to further development of this new energy transfer device.

  • 4.
    Raza, Rizwan
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
    Wang, Xiaodi
    KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.
    Ma, Ying
    KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.
    Liu, Xiangrong
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
    Zhu, Bin
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
    Improved ceria-carbonate composite electrolytes2010In: International journal of hydrogen energy, ISSN 0360-3199, E-ISSN 1879-3487, Vol. 35, no 7, p. 2684-2688Article in journal (Refereed)
    Abstract [en]

    It has been successfully demonstrated that the fuel cells using the ceria-carbonate composite as electrolytes have achieved excellent performances of 200-1150 W/cm(2) at 300-600 degrees C. Previously it was reported these ceria-carbonate composite electrolytes have been prepared with two-step processes: step 1, prepare ion-doped ceria which was prepared usually through the wet-chemical co-precipitation process; step 2, mixing the doped ceria with carbonates in various compositions. We first report here to prepare the SDC-carbonate composites within one-step chemical co-precipitation process, i.e. mixing carbonates and preparing the SDC in the same process. The one-step process has provided a number of advantages: (i) to reduce the involved preparation processes to enhance the production, to make the produced materials in good quality control, more homogenous composites microstructure; (ii) as results, these composites showed also different microstructures and electrical properties. It has significantly improved the ceria-carbonate conductivities and cause the superionic conduction at much lower temperatures; (iii) to reduce manufacturing costs also.

  • 5.
    Zhu, Bin
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology. Haerbin University of Engineering, China.
    Liu, XiangRong
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology.
    Cheng, Y.
    Zhang, M.
    Novel catalytic electrodes for high performance solid oxide fuel cells operated at intermediate temperatures2007In: High-Performance Ceramics IV, Pts 1-3, Trans Tech Publications Inc., 2007, p. 428-433Conference paper (Refereed)
    Abstract [en]

    The all-ceria-composite ITSOFCs have demonstrated extraordinary fuel cell performances since the ceria-composite electrodes are very catalytic and conductive, and the ceria-composite electrolytes are highly conductive and also electrolytic, in addition to excellent compatibility between the electrolyte and electrodes based on the same ceria-based composite materials. The power density outputs from 200 to 800 mWcm -2, were obtained for temperatures between 400 and 700°C. The maximum power density 0.72 Wcm -2 (1500 mAcm -2) at 600°C and 0.82 Wcm -2 (1800 mAcm -2) at 700°C were achieved, respectively. These highly catalytic electrodes functioned extensively for many different fuels, such as hydrogen and hydrocarbon fuels, e.g., natural gas, coal gas, methanol and ethanol etc. In some special cases, the ITSOFCs with the ceria-composite electrodes could also work at as low as 200°C. All these good performances are based on the novel catalyst function of the ceria-composite electrodes and internal reforming mechanism.

  • 6.
    Zhu, Bin
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology.
    Liu, Xiangrong
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology.
    Sun, J.
    Fuel cell studies using the CeO2-La2O3 based electrolytes2007In: High-Performance Ceramics IV, Pts 1-3, Trans Tech Publications Inc., 2007, p. 490-493Conference paper (Refereed)
    Abstract [en]

    The ceria oxide and lanthanum oxide are almost insulators, but the binary CeO2 and La2O3 system created a new type of the electrolyte with high ionic conductivity. The FC studies were carried out by using the CeO2-La2O3 and relevant composites as the electrolytes. The binary CeO2-La2O3 electrolytes showed a fuel cell performance 300 to 650 mWcm-2 at temperatures between 480 and 630°C, and their composites with the carbonates demonstrated the higher performance, 300 to 720 mWcm-2 for temperatures from 390 to 630°C.

  • 7.
    Zhu, Bin
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology. Goeta Technology Development International, Sweden .
    Liu, Xiangrong
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology. Goeta Technology Development International, Sweden .
    Zhu, Z.
    Ljungberg, R.
    Development of low temperature solid oxide fuel cells2006In: Proceedings of 4th International ASME Conference on Fuel Cell Science, Engineering and Technology, 2006Conference paper (Refereed)
    Abstract [en]

    Based on innovative ceria-based composite (CBC) material advantages we have made strong efforts to make technical developments on scaling up material production, fabrication technologies on large cells and stack operated at low temperatures (300 to 600°C). Next generation materials for solid oxide fuel cells (SOFCs) have been developed based on abundant natural resources of the industrial grade mixed rare-earth carbonates named as LCP. Here we show the LCP-based materials used as functional electrolytes to achieve excellent fuel cell performances, 300-800 mWcm2 for low temperatures, exhibiting a great availability for industrialization and commercialization. Copyright

  • 8.
    Zhu, Bin
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology. Institute of Materials and Technology, Dalian Maritime University, China .
    Sun, J.
    Sun, X.
    Li, S.
    Gao, W.
    Liu, Xiangrong
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology. Goeta Technology Development International, Sweden .
    Zhu, Z.
    Compatible cathode materials for high performance low temperature (300-600°C) solid oxide fuel cells2006In: Proceedings of 4th International ASME Conference on Fuel Cell Science, Engineering and Technology, FUELCELL2006, 2006Conference paper (Refereed)
    Abstract [en]

    We have made extensive efforts to develop various compatible electrode materials for the ceria-based composite (CBC) electrolytes, which have been, reported as most advanced LTSOFC electrolyte materials (Zhu, 2003). The electrode materials we have investigated can be classified as four categories: i) LSCCF (LaSrCoCaFeO) and BSCF perovskite oxides applied for our CBC electrolyte LTSOFCs; ii) LFN (LaFeO-based oxides, e.g. LaFe0.8Ni 0.2O3) perovskite oxides; iii) lithiated oxides: e.g. LiNiOx, LiVOx or LiCuOx are typical cathode examples for the CBC LTSOFCs; iv) other mixed oxide systems, most common in a mixture of two-oxide phases, such CuOx-NiOx, CuO-ZnO etc. systems with or without lithiation are developed for the CBC systems, especially for direct alcohol LTSOFCs. These cathode materials used for the CBC electrolyte LTSOFCs have demonstrated excellent performances at 300-600°C, e.g. 1000 mWcm-2 was achieved at 580°C. The LTSOFCs can be operated with a wide range of fuels, e.g. hydrogen, methanol, ethanol etc with great potential for applications. Copyright

1 - 8 of 8
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