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  • 1.
    Liu, Liang
    et al.
    China Univ Geosci, Fac Mat Sci & Chem, Minist Educ, Engn Res Ctr Nanogeo Mat, 388 Lumo Rd, Wuhan 430074, Hubei, Peoples R China..
    Liu, Yanyan
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Li, Lingyao
    China Univ Geosci, Fac Mat Sci & Chem, Minist Educ, Engn Res Ctr Nanogeo Mat, 388 Lumo Rd, Wuhan 430074, Hubei, Peoples R China..
    Wu, Yan
    China Univ Geosci, Fac Mat Sci & Chem, Minist Educ, Engn Res Ctr Nanogeo Mat, 388 Lumo Rd, Wuhan 430074, Hubei, Peoples R China..
    Singh, Manish
    Lund Univ, Pure & Appl Biochem Chem Ctr, S-22241 Lund, Sweden..
    Zhu, Bin
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology. China Univ Geosci, Fac Mat Sci & Chem, Minist Educ, Engn Res Ctr Nanogeo Mat, 388 Lumo Rd, Wuhan 430074, Hubei, Peoples R China.
    The composite electrolyte with an insulation Sm2O3 and semiconductor NiO for advanced fuel cells2018In: International journal of hydrogen energy, ISSN 0360-3199, E-ISSN 1879-3487, Vol. 43, no 28, p. 12739-12747Article in journal (Refereed)
    Abstract [en]

    Novel Sm2O3-NiO composite was prepared as the functional electrolyte for the first time. The total electrical conductivity of Sm2O3-NiO is 0.38 S cm(-1) in H-2/air condition at 550 degrees C. High performance, e.g. 718 mW cm(-2), was achieved using Sm2O3-NiO composite as an electrolyte of solid oxide fuel cells operated at 550 degrees C. The electrical properties and electrochemical performance are strongly depended on Sm2O3 and NiO constituent phase of the compositions. Notably, surprisingly high ionic conductivity and fuel cell performance are achieved using the composite system constituting with insulating Sm2O3 and intrinsic p-type conductive NiO with a low conductivity of 4 x 10(-3) S cm(-1). The interfacial ionic conduction between two phases is a dominating factor giving rise to significantly enhanced proton conduction. Fuel cell performance and further ionic conduction mechanisms are under investigation.

  • 2.
    Liu, Yanyan
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Fan, Liangdong
    Cai, Yixiao
    Zhang, Wei
    Wang, Baoyuan
    Zhu, Binzhu
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
    Superionic Conductivity of Sm3+, Pr3+, and Nd3+ Triple-Doped Ceria through Bulk and Surface Two-Step Doping Approach2017In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 9, no 28, p. 23614-23623Article in journal (Refereed)
    Abstract [en]

    Sufficiently high oxygen ion conductivity of electrolyte is critical for good performance of low-temperature solid oxide fuel cells (LT-SOFCs). Notably, material conductivity, reliability, and manufacturing cost are the major barriers hindering LT-SOFC commercialization. Generally, surface properties control the physical and chemical functionalities of materials. Hereby, we report a Sm3+, Pr3+, and Nd3+ triple-doped ceria, exhibiting the highest ionic conductivity among reported doped-ceria oxides, 0.125 S cm(-1) at 600 degrees C. It was designed using a two-step wet-chemical coprecipitation method to realize a desired doping for Sm3+ at the bulk and Pr3+/Nd3+ at surface domains (abbreviated as PNSDC). The redox couple Pr3+ Pr4+ contributes to the extraordinary ionic conductivity. Moreover, the mechanism for ionic conductivity enhancement is demonstrated. The above findings reveal that a joint bulk and surface doping methodology for ceria is a feasible approach to develop new oxide-ion conductors with high impacts on advanced LT-SOFCs.

  • 3.
    Liu, Yanyan
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Mushtaq, Mahr Naveed
    Hubei Univ, Fac Phys & Elect Sci, Hubei Collaborat Innovat Ctr Adv Organ Chem Mat, Wuhan 430062, Hubei, Peoples R China.;COMSATS Inst Informat Technol, Dept Phys, Lahore 54000, Pakistan..
    Zhang, Wei
    Michigan Technol Univ, Dept Mat Sci & Engn, 1400 Townsend Dr, Houghton, MI 49931 USA..
    Teng, Aijun
    Northeastern Univ, Sch Met, Shenyang 110819, Liaoning, Peoples R China.;Key Lab Liaoning Prov Recycling Sci Met Resources, Shenyang, Liaoning, Peoples R China..
    Liu, Xueqi
    Hubei Univ, Fac Phys & Elect Sci, Hubei Collaborat Innovat Ctr Adv Organ Chem Mat, Wuhan 430062, Hubei, Peoples R China..
    Single-phase electronic-ionic conducting Sm3+/Pr3+/Nd3+ triple-doped ceria for new generation fuel cell technology2018In: International journal of hydrogen energy, ISSN 0360-3199, E-ISSN 1879-3487, Vol. 43, no 28, p. 12817-12824Article in journal (Refereed)
    Abstract [en]

    Co-doped CeO2 materials have exhibited promising potential for low temperature solid oxide fuel cell (LT-SOFC) applications. Sm3+, Pr3+ and Nd3+ triple-doped ceria has been synthesized via two-step wet chemical approach. First samarium doped ceria (SDC) was prepared and then the Pr3+/Nd3+ ions as doping elements (secondary process) was added. The structural structure was studied by X-ray diffraction (XRD), that indicate Sm3+, Prat and Nd3+ ions are doped into the ceria lattice up to the certain limit (Pr3+/Nd3+ 10 wt%). The impurity peaks are detected as doping contents increased above the certain limit (Pr3+/Nd3+ 20 wt %). In this work, further we investigated the effect increasing Pr3+/Nd3+ doping concentration on the performance of SOFC device. Here, we studied that high-concentration triple-doped ceria samples with mixed electrons/ions conductive property, as the semiconductor-ionic conducting layer, combined with commercial p-type semiconductor Ni0.8Co0.15Al0.05LiO2-delta (NCAL) to fabricate the 'sandwich' configuration for a developing fuel cell technology-electrolyte free fuel cells (EFFCs). This button size fuel cell delivered a maximum power output of 1011 mW cm(-2). The demonstrated findings show that the single-phase semiconductor-ionic material-Sm3+/Pr3+/Nd3+ triple-doped CeO2 can be selected potential candidate for the further development the EFFC technology.

  • 4.
    Liu, Yanyan
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Wu, Yan
    Zhang, Wei
    Zhang, Jing
    Wang, Baoyuan
    Xia, Chen
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Afzal, Muhammad
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Li, Junjiao
    Singh, Manish
    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. Hubei University, China.
    Natural CuFe2O4 mineral for solid oxide fuel cells2017In: International journal of hydrogen energy, ISSN 0360-3199, E-ISSN 1879-3487, Vol. 42, no 27, p. 17514-17521Article in journal (Refereed)
    Abstract [en]

    Natural mineral, cuprospinel (CuFe2O4) originated from natural chalcopyrite ore (CuFeS2), has been used for the first time in low temperature solid oxide fuel cells. Three different types of devices are fabricated to explore the optimum application of CuFe2O4 in fuel cells. Device with CuFe2O4 as a cathode catalyst exhibits a maximum power density of 180 mW/cm(2) with an open circuit voltage 1.07 V at 550 degrees C. And a power output of 587 mW/cm(2) is achieved from the device using a homogeneous mixture membrane of CuFe2O4, Li2O-ZnO-Sm0.2Ce0.8O2 and LiNi0.8Co0.15Al0.05O2. Electrochemical impedance spectrum analysis reveals different mechanisms for the devices. The results demonstrate that natural mineral, chalcopyrite, can provide a new implementation to utilize the natural resources for next generation fuel cells being cost-effective and make great contributions to the environmentally friendly sustainable energy.

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