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International journal of hydrogen energy 51건

  1. [해외논문]   Editorial Board   SCI SCIE


    International journal of hydrogen energy v.39 no.12 ,pp. iii - iv , 2014 , 0360-3199 ,

    초록

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  2. [해외논문]   Solvothermal synthesis of La9.33Si6O26 nanocrystals and their enhancing impacts on sintering and oxygen ion conductivity of Sm0.2Ce0.8O1.9/La9.33Si6O26 composite electrolytes   SCI SCIE

    Yin, S. , Zeng, Y. , Cai, T. , Li, C. , Chen, X. , Cao, L.
    International journal of hydrogen energy v.39 no.12 ,pp. 6295 - 6306 , 2014 , 0360-3199 ,

    초록

    La 9.33 Si 6 O 26 (LSO) nanocrystals, quasi-spherical in shape and of an average size ca. 45 nm, were synthesized via a solvothermal process and used to mix with Sm 0.2 Ce 0.8 O 1.9 (SDC) ultrafine powder to fabricate SDC-LSO composite electrolytes for the applications in IT-SOFCs. The microstructures and phase components of LSO nanocrystals and SDC-LSO composite electrolytes were characterized by XRD, TEM and HRTEM and, in particular, the sintering performance and oxide ion conductivity of SDC-LSO composites with different SDC/LSO volume ratios were studied. It has been found that the LSO nanocrystals are homogeneously dispersed in the as-sintered SDC-LSO composites and no impurity phases due to chemical reactions can be detected between SDC and LSO particles by XRD, but the sintering performance is remarkably improved with a temperature reduction by 100-250 o C, compared to that for the individual constituent phases. Moreover, the oxide ions conductivity of SDC-LSO composites can be conspicuously enhanced with the sample SL7525 (SDC/LSO = 0.75/0.25) showing the highest enhancement by 118%, i.e. 1.62 times that of SDC at 800 o C. The SDC/LSO hetero-interfaces with high energy and appropriate residual thermal stresses in the SDC-LSO composite microstructures are considered responsible for their improved sintering performance and significant enhancements in oxide ions conductivity.

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  3. [해외논문]   Proton exchange membrane water electrolysis with short-side-chain Aquivion® membrane and IrO2 anode catalyst   SCI SCIE

    Skulimowska, A. , Dupont, M. , Zaton, M. , Sunde, S. , Merlo, L. , Jones, D.J. , Roziere, J.
    International journal of hydrogen energy v.39 no.12 ,pp. 6307 - 6316 , 2014 , 0360-3199 ,

    초록

    A series of three membrane types has been screened for medium temperature solid polymer electrolyte water electrolysis in membrane electrode assemblies coated with 2 mg cm -2 of iridium oxide as a catalyst for the oxygen evolution reaction, synthesised via a hydrolysis method from the hexachloroiridic acid precursor, and deposited on the membrane either directly by spray deposition or by decal transfer. The short-side-chain perfluorosulfonic acid Aquivion ? ionomer of equivalent weight 870 meq g -1 , in membranes of thickness 120 μm, gives higher water electrolysis performance at 120 o C than a composite membrane of Aquivion ? with zirconium phosphate, while a sulfonated ether-linked polybenzimidazole, sulfonated poly-[(1-(4,4'-diphenylether)-5-oxybenzimidazole)-benzimidazole], shows promising performance and no transport limitations up to 2 A cm -2 . The lowest cell voltage was observed at 120 o C for an MEA prepared using spray-coating directly on the Aquivion ? membrane, 1.57 V at 1 A cm -2 .

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  4. [해외논문]   Improved kinetic model for water splitting thermochemical cycles using Nickel Ferrite   SCI SCIE

    Kostoglou, M. , Lorentzou, S. , Konstandopoulos, A.G.
    International journal of hydrogen energy v.39 no.12 ,pp. 6317 - 6327 , 2014 , 0360-3199 ,

    초록

    In a previous work of the authors (AIChE Journal 2013; 59(4): 1213-1225) on the characterization of the performance of redox material compositions during two-step thermochemical splitting of water, it was observed that fitting of the obtained hydrogen and oxygen concentration profiles with a reaction model based on simple first order reaction rates could describe adequately only the first part of the evolution curves. This suggested that more complicated reaction models taking into account the structure of the redox material are needed to describe the whole extent of the experimental data. Based on the above, a minimum set of experiments for water splitting thermochemical cycles over a Nickel-ferrite was deigned and performed involving an increased duration of the reaction steps. A new extended model was derived for the water splitting and thermal reduction reactions, which considers two oxygen storage regions of the redox material communicating to each other by a solid state diffusion mechanism. The inclusion of two state variables instead of one has a significant effect on the reaction dynamics and renders the model capable to explain the dynamics of the convergence of the thermochemical cycles to a periodic steady state, observed experimentally in the previous work.

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  5. [해외논문]   Study of hydrogen production and storage based on aluminum-water reaction   SCI SCIE

    Elitzur, S. , Rosenband, V. , Gany, A.
    International journal of hydrogen energy v.39 no.12 ,pp. 6328 - 6334 , 2014 , 0360-3199 ,

    초록

    The rate and yield of hydrogen production from the reaction between activated aluminum and water has been investigated. The effect of different parameters such as water-aluminum ratio, water temperature and aluminum particle size and shape was studied experimentally. The aluminum activation method developed in-house involves 1%-2.5% of lithium-based activator which is diffused into the aluminum particles, enabling sustained reaction with tap water or sea water at room temperature. Hydrogen production rates in the range of 200-600 ml/min/g Al, at a yield of about 90%, depending on operating parameters, were demonstrated. The work further studied the application in proton exchange membrane (PEM) fuel cells in order to generate green electric energy, demonstrating theoretical specific electric energy storage that can exceed batteries by 10-20 folds.

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  6. [해외논문]   Improving photocatalytic activity for hydrogen evolution over ZnIn2S4 under visible-light: A case study of rare earth modification   SCI SCIE

    Tian, F. , Zhu, R. , He, Y. , Ouyang, F.
    International journal of hydrogen energy v.39 no.12 ,pp. 6335 - 6344 , 2014 , 0360-3199 ,

    초록

    A series of rare earth (RE) ions (La 3+ , Ce 3+ , Gd 3+ , Er 3+ or Y 3+ ) modified ZnIn 2 S 4 photocatalysts (RE-ZnIn 2 S 4 ) were prepared using the hydrothermal method and characterized by various analysis techniques, such as UV-Vis diffusive reflectance spectroscopy, X-ray diffraction, scanning electron microscopy, Brunauer-Emmett-Teller surface analyzer, photoluminescence spectroscopy and X-ray photoelectron spectroscopy. The results indicated that the RE element exists as the oxide RE 2 O 3 and their modification can reduce ZnIn 2 S 4 crystallite size, inhibit ZnIn 2 S 4 grain growth, promote ZnIn 2 S 4 crystallite self-organization into a micro-sphere flower-like morphology, increase ZnIn 2 S 4 surface area and total pore volume, and bring rich defects to ZnIn 2 S 4 . The photocatalytic activities of RE-ZnIn 2 S 4 were evaluated based on photocatalytic hydrogen production from water under visible-light irradiation and the hydrogen production efficiency increased by 46%, 53%, 61%, 69%, and 106% after adding 2.0 wt% of Y, Gd, Er, Ce and La, respectively. The relationship between the photocatalytic activity of RE-ZnIn 2 S 4 and the RE properties was discussed.

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  7. [해외논문]   Synergistic effect of Cu2O/TiO2 heterostructure nanoparticle and its high H2 evolution activity   SCI SCIE

    Xi, Z. , Li, C. , Zhang, L. , Xing, M. , Zhang, J.
    International journal of hydrogen energy v.39 no.12 ,pp. 6345 - 6353 , 2014 , 0360-3199 ,

    초록

    Cu 2 O/TiO 2 nanoparticles were prepared by solvothermal method, which formed the heterostructure of Cu 2 O/TiO 2 . Due to the heterostructure, the H 2 evolution rate under simulated solar irradiation was increasingly promoted. Meanwhile a certain amount of Cu particles which were confirmed by Transmission Electro Microscopy (TEM) and X-Ray Photoelectron Spectroscopy (XPS), formed on the surface of Cu 2 O/TiO 2 , and the photoactivity was accordingly further enhanced. The stabilized activity was maintained after many times irradiation. It is interesting that after a few hours irradiation the amount of Cu particles on the surface kept unchanged in the presence of Cu 2 O and TiO 2 . The Cu particles that formed during hydrogen generation reaction play a key role in the further enhancement of the hydrogen production activity. In this study, it is the first time to study the details on the formation of the stable ternary structure under simulated solar irradiation and their synergistic effect on the photoactivity of the water splitting.

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  8. [해외논문]   Synthesis of g-C3N4/TiO2 with enhanced photocatalytic activity for H2 evolution by a simple method   SCI SCIE

    Wang, J. , Huang, J. , Xie, H. , Qu, A.
    International journal of hydrogen energy v.39 no.12 ,pp. 6354 - 6363 , 2014 , 0360-3199 ,

    초록

    A photocatalyst composed of graphite-like carbon nitride (g-C 3 N 4 ) and TiO 2 was fabricated by a simple method to calcine the mixture of melamine and TiO 2 precursor. The photocatalyst has enhanced photoactivity for hydrogen evolution from water. Characterization by XRD, FTIR, SEM and elemental analysis showed that the crystal structure and morphologies of composites were affected by the amount of melamine in the composite. The UV-Vis characterization displayed that the optical absorption range of g-C 3 N 4 /TiO 2 hybrid was broadened with a synergistic effect. The photoactivity for H 2 evolution was shown that the best result obtained from the composite with 67 wt% melamine has about 5 times improvement compared with bare TiO 2 or pure g-C 3 N 4 . The enhanced photoactivity might be related with the favorable structure resulted from heat-treatment temperature, and the content of g-C 3 N 4 participating in wide optical absorption, separation and transportation of electronic-holes, as well as morphology of composite.

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  9. [해외논문]   Effects of atmospheric aerosol on the direct normal irradiance on the earth's surface   SCI SCIE

    Mao, Q. , Yuan, Y. , Shuai, Y.
    International journal of hydrogen energy v.39 no.12 ,pp. 6364 - 6370 , 2014 , 0360-3199 ,

    초록

    Direct normal irradiance (DNI) plays a key role on the quantity and rate of hydrogen production. The accurate calculation of DNI has very important significance for low-cost hydrogen economy and efficient utilization of solar energy. This study mainly takes account of the influence of atmospheric aerosol on DNI and the experimental tests. The main idea of this paper is: obtaining the distribution characteristics of aerosol particles in the atmosphere and the optical depth of aerosol spectrum based on inversion method of ground observation station data; calculating the attenuation coefficient of solar spectrum with classical Mie scattering theory and particle system radiation characteristics; calculating aerosol attenuation coefficient under full spectrum, namely the aerosol correction factor (defined as the ratio of the attenuation coefficient of aerosol atmosphere to standard atmosphere under full spectrum) with Planck model, Rosseland model and Planck-Rosseland model respectively; choosing with the theoretical calculation model of aerosol correction factor based on the solar spectrum radiation calculated by SMARTS software; verifying the accuracy of this theoretical model with experimental DNI in city Harbin. The results show that there is a good agreement with a minimum variation of 3.08% and a maximum variation of 9.97%.

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  10. [해외논문]   Catalytic pyrolysis of distillers dried grain with solubles: An attempt towards obtaining value-added products   SCI SCIE

    Liu, W.w. , Wang, X.p. , Hu, C.w. , Tong, D.m. , Zhu, L.f. , Li, G.y.
    International journal of hydrogen energy v.39 no.12 ,pp. 6371 - 6383 , 2014 , 0360-3199 ,

    초록

    Catalytic pyrolysis of distillers dried grain with solubles by nickel-based catalysts was performed. The effects of pyrolysis temperature, catalytic carrier and components on the products were investigated. The catalysts were characterized with NH 3 -TPD, XPS, H 2 -TPR. The average higher heating value (HHV) of the bio-oil was about 61% of the HHV of gasoline. GC/MS analysis indicated that the bio-oil contained some value-added compounds such as 2-furaldehyde, 2-furanmethanol, 3-pyridinol, dodecane, etc. The pyrolysis gas rich in hydrogen was obtained under the direct catalysis of nickel-based catalysts. For Ni-Pd-γ-Al 2 O 3 , the volume percentage of hydrogen in gas reached 55.6 vol.% at 500 o C, revealing that there was a strong synergistic effect between Ni and Pd. According to the experimental results the possible mechanism was proposed. It was considered that the metal species over catalyst was the most important factor for its performance, and the influence from its Lewis acidity could not be ignored.

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