夏长荣
固体氧化物燃料电池及其相关材料,无机膜材料和过程,以及生物质高效能源化
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- 姓名:夏长荣
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学术头衔:
博士生导师
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学科领域:
材料科学基础学科
- 研究兴趣:固体氧化物燃料电池及其相关材料,无机膜材料和过程,以及生物质高效能源化
夏长荣 博士中国科学技术大学材料科学与工程系教授、博士生导师 1996,中国科学技术大学,博士 1993,中国科学技术大学,硕士 1990,中国科学技术大学,学士 2000年5月-02年9月,美国Georgia Institute of Technology博士后研究 1997年1月-97年8月,瑞典Uppsala大学和法国Montpellier大学合作研究 研究兴趣主要集中在无机非金属材料的合成科学,探索应用于洁净能源和环境工程的新材料,同时研究材料的结构和性能的关系。研究领域包括无机固体材料合成化学,固态离子学,固体电化学和能源科学与技术。研究对象主要为固体氧化物燃料电池及其相关材料,无机膜材料和过程,以及生物质高效能源化。 电子信箱 xiacr@ustc.edu.cn 电话 0551-3607475 传真 0551-3606689
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【期刊论文】Boehmite sol properties and preparation of two-layer alumina membrane by a sol-gel process
夏长荣, Xia Changrong a, Wu Feng a, Meng Zhaojing a, Li Fanqing b, Peng Dingkun a, Meng Guangyao a, *
X. Changrong et al./Journal of Membrane Science 116 (1996) 9-16,-0001,():
-1年11月30日
A two layer ultrafiltration alumina membrane was prepared by a sol-gel process using boehmite sol as precursor. The sol was prepared by hydrolysation of aluminium tri-sec-butoxide. Sol properties, such as viscosity as a function of concentration and acidity, were investigated by using capillary viscometry, transmission electron microscopy and laser scattering photometry etc. The viscosity increased with an increase in concentration and a decrease in pH, while the particle shape and size of the sol were mainly determined by pH. The membrane prepared by a dipping procedure was characterized by both scanning electron microscopy and transmission electron microscopy. The results showed that the membrane thickness and surface morphology were affected by the dipping time, the viscosity and the temperature.
Inorganic membrane, Alumina membrane, Boehmite sol, Sol-gel process, Sol property
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夏长荣, Xia Changrong*, Cao Huaqiang, Wang Hong, Yang pinghua, Meng Guangyao, Peng Dingkun
X. Changrong et al./Journal of Membrane Science 162 (1999) 181-188,-0001,():
-1年11月30日
Yttria stabilized zirconia (YSZ) polymeric sols were synthesized by controlled hydrolysis and condensation of zirconium tetra-n-propoxide. Yttrium nitrate was added before hydrolysis as the source of yttria. Acetylacetone was used as chelating ligand to modify the reaction rate of zirconium alkoxide. The dependence of YSZ sol formation as well as gelation time was investigated experimentally on the contents of acetylacetone, n-propanol (solvent) and water for hydrolysis. With a stable sol, YSZ membranes were prepared on porous α-alumina supports by a dip-coating process. The membranes were characterized by scanning electron microscopy and gas permeability testing. Unsupported YSZ membranes were also prepared with the same sol, and were investigated with isothermal nitrogen adsorption/desorption porosimetry and X-ray diffraction. The results show that YSZ membranes with nanosize pores were successfully prepared by the sol-gel technique with the polymeric sols.
YSZ, Sol-gel, Ceramic membrane, YSZ sol, Controlled hydrolysis
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【期刊论文】Reduced-Temperature Solid Oxide Fuel Cells Fabricated by Screen Printing
夏长荣, Changrong Xia, Fanglin Chen, * and Meilin Liu, **, z
Electrochemical and Solid-State Letters, 4 (5) A52-A54 (2001),-0001,():
-1年11月30日
Electrolyte films of samaria-doped ceria (SDC, Sm0.2Ce0.8O1.9) are fabricated onto porous NiO-SDC substrates by a screen printing technique. A cathode layer, consisting of Sm0.5Sr0.5CoO3 and 10 wt% SDC, is subsequently screen printed on the electrolyte to form a single cell, which is tested at temperatures from 400 to 600℃. When humidified (3% H2O) hydrogen or methane is used as fuel and stationary air as oxidant, the maximum power densities are 188 (or 78) and 397 (or 304) mW/cm2 at 500 and 600℃, respectively. Impedance analysis indicates that the performances of the solid oxide fuel cells (SOFCs) below 550℃ are determined primarily by the interfacial resistance, implying that the development of catalytically active electrode materials is critical to the successful development of high-performance SOFCs to be operated at temperatures below 600℃.
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【期刊论文】Low-temperature SOFCs based on Gd0.1Ce0.9O1.95 fabricated by dry pressing
夏长荣, Changrong Xia, Meilin Liu*
C. Xia, M. LiurSolid State Ionics 144 (2001) 249-255,-0001,():
-1年11月30日
Anode-supported solid oxide fuel cells (SOFCs) based on gadolinia-doped ceria (GDC, Gd0.1Ce0.9O1.95) are fabricated by a simple and cost-effective dry-pressing process. With a composite anode consisting of NiO+35wt.% GDC and a composite cathode consisting of Sr0.5Sr0.5CoO3 (SSC) and 10 wt.% GDC, the cells are tested at temperatures from 400 to 6508℃. When humidified (3% H2O) hydrogen is used as fuel and stationary air as oxidant, the maximum power densities are 145 and 400mW/cm2 at 500 and 600℃, respectively. Impedance analysis indicates that the performances of the SOFCs are determined essentially by the interfacial resistances below 5508C. Further, while the anodic polarization resistances are negligible, the cathodic polarization resistances are significant, suggesting that development of new cathode materials is especially important to SOFCs to be operated at low temperatures.
Solid oxide fuel cells, Gd0., 1Ce0., 9O1., 95, Dry pressing
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【期刊论文】Sm0.5Sr0.5CoO3 cathodes for low-temperature SOFCs
夏长荣, Changrong Xia, William Rauch, Fanglin Chen, Meilin Liu*
C. Xia et al./Solid State Ionics 149 (2002) 11-19,-0001,():
-1年11月30日
The electrochemical properties of the interfaces between an Sm0.2Ce0.8O1.9 (samaria-doped ceria, SDC) electrolyte and porous composite cathodes consisting of Sm0.5Sr0.5CoO3 (SSC) and SDC have been investigated in anode-supported single cells at low temperatures (400-600℃). The bilayer structures of the SDC electrolyte films (25 Am thick) and the NiO-SDC anode supports were formed by co-pressing and subsequent co-firing at 1350℃ for 5h. The effect of composition, firing temperature, and microstructure of the composite cathodes on the electrochemical properties is systematically studied. Results indicate that the optimum firing temperature is about 950℃, whereas the optimum content of SDC electrolyte in the composite cathodes is about 30 wt.%. It is noted that the addition of the proper amount of SDC to SSC dramatically improved the catalytic properties of the interfaces; reducing the interfacial resistance by more than one order of magnitude compared with an SSC cathode without SDC.
Solid oxide fuel cells, Low-temperature SOFC, Strontium-doped samarium cobaltite, Interfacial resistance, Cathode
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【期刊论文】Novel Cathodes for Low-Temperature Solid Oxide Fuel Cells**
夏长荣, By Changrong Xia and Meilin Liu*
Adv. Mater. 2002, 14, No.7 April 4,-0001,():
-1年11月30日
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【期刊论文】Functionally Graded Cathodes for Honeycomb Solid Oxide Fuel Cells
夏长荣, Changrong Xia, William Rauch, *, William Wellborn, and Meilin Liu**, z
Electrochemical and Solid-State Letters, 5 (10) A217-A220 (2002),-0001,():
-1年11月30日
Functionally graded cathodes were fabricated by slurry coating process for honeycomb solid oxide fuel cells with yttria-stabilized zirconia (YSZ) electrolytes. The cathodes are composed of strontium-doped lanthanum manganate (LSM), gadolinia-doped ceria, and La0.6Sr0.4Co0.2Fe0.8O3 (LSCF). The LSM content was gradually decreased, while the LSCF content was gradually increased with the increasing distance away from the electolyte-electrode interface. Scanning electron microscopy investigation and electrochemical impedance spectroscopy measurements revealed that the electrochemical performance of the graded cathodes depends sensitively on the microstructures that were primarily determined by firing temperatures. The cathodes graded in composition show interfacial resistances about 10 times lower than traditional LSM-YSZ cathodes that have similar microstructures and thickness. The graded cathode fired at low temperature has an interfacial resistance as low as 0.47Ωcm2 at 750℃, which is very encouraging for developing honeycomb fuel cells operated below 800℃.
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夏长荣, Changrong Xia, Yuelan Zhang, and Meilin Liu a)
Appl. Phys. Lett., Vol. 82, No.6, 10 February 2003,-0001,():
-1年11月30日
Composites consisting of silver and yttria stabilized bismuth oxide (YSB) have been investigated as cathodes for low-temperature honeycomb solid oxide fuel cells with stabilized zirconia as electrolytes. At 600℃, the interfacial polarization resistances of a porous YSB-Ag cathode is about 0.3Ωcm2, more than one order of magnitude smaller than those of other reported cathodes on stabilized zirconia. For example, the interfacial resistances of a traditional YSZ-lanthanum maganites composite cathode is about 11.4Ωcm2 at 600℃. Impedance analysis indicated that the performance of an YSB-Ag composite cathode fired at 850℃ for 2h is severely limited by gas transport due to insufficient porosity. The high performance of the YSB-Ag cathodes is very encouraging for developing honeycomb fuel cells to be operated at temperatures below 600℃.
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【期刊论文】LSM-GDC Composite Cathodes Derived from a Sol-Gel Process
夏长荣, Changrong Xia, Yuelan Zhang, and Meilin Liu*, z
Electrochemical and Solid-State Letters, 6 (12) A290-A292 (2003),-0001,():
-1年11月30日
Electrodes consisting of strontium-doped lanthanum manganite (LSM) and gadolinium-doped ceria (GDC) were developed with a modified sol-gel process for honeycomb solid oxide fuel cells based on stabilized zirconia electrolytes. The sol-gel derived cathodes show much lower interfacial polarization resistances than those prepared by slurry coating or spray deposition. The interfacial polarization resistances were 0.65 and 0.16Ωcm2 at 650 and 750℃, respectively, as determined using impedance spectroscopy. The high performance is attributed to the small grain size, high porosity, and large specific surface area of the cathode, demonstrating the dramatic effect of microstructure on electrode performance.
Manus, c, r, i, p, t, submitted May 3,, 2003, revised manus, c, r, i, p, t, received July 7,, 2003., Available electronically October 15,, 2003.,
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【期刊论文】Low-temperature SOFCs using biomass-produced gases as fuels
夏长荣, YANHONG YIN, WEI ZHU, CHANGRONG XIA*, CEN GAO and GUANGYAO MENG
Journal of Applied Electrochemistry 34: 1287-1291, 2004.,-0001,():
-1年11月30日
The electromotive force (e. m. f) is calculated for solid oxide fuel cells (SOFCs) based on doped ceria electrolytes using biomass-produced gases (BPG, 14.7% CO, 14.2% CO2, 15.3% H2, 4.2% CH4, and 51% N2) as fuels and air as oxidant. It reveals that the BPG derived e.m.f. is very close to hydrogen when doped ceria is used as the electrolyte. A 35-lm-thick samaria-doped ceria based single cell was tested between 450 and 650 C using BPG as fuel. Maximum power density of about 700mW cm-2 was achieved at 650℃ The open-circuit voltage at 450℃ was 0.96V, close to the calculated value. However, the cell power density using BPG as fuel was relatively lower than that using humidified hydrogen (3% H2O), and close to that using humidified methane (3% H2O). Impedance measurements indicate that the relatively lower power output may be attributed to the high anode-electrolyte interfacial polarization resistance when BPG is used as fuel.
biomass,, biomass-produced gases (, BPG), ,, doped ceria,, electromotive force,, solid oxide fuel cells
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