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  • 1
    Electronic Resource
    Electronic Resource
    Doped LaGaO3 Perovskite Type Oxide as a New Oxide Ionic Conductor (1994)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 116 (1994), S. 3801-3803 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00088a016
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation of Yttria-Stabilized Zirconia Thin Films on Strontium-Doped LaMnO3 Cathode Substrates via Electrophoretic Deposition for Solid Oxide Fuel Cells (2000)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 83 (2000), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A yttria-stabilized zirconia (YSZ) thin film on an La0.8Sr0.2MnO3 porous cathode substrate was prepared, using electrophoretic deposition (EPD) to fabricate a solid oxide fuel cell (SOFC). The electrical conductivity of an La0.8Sr0.2MnO3 substrate is satisfactorily high at room temperature; therefore, YSZ powder could be deposited electrophoretically onto an La0.8Sr0.2MnO3 substrate without any extra surface treatment, such as a metal coating. Successive repetition of EPD and sintering was required to obtain a film without gas leakage, because of the thermal expansion coefficient mismatch between the YSZ and the La0.8Sr0.2MnO3 substrate. On the other hand, the electromotive force of the oxygen concentration in the cell that used YSZ film prepared via EPD increased and attained the theoretical value when the number of deposition and calcination cycles was increased. Six or more successive repetitions were required to obtain a YSZ film without gas leakage. A planar-type SOFC was fabricated, using nickel as the anode and YSZ film (∼10 μm thick) that had been deposited onto the La0.8Sr0.2MnO3 substrate as the electrolyte and cathode. The cell exhibited an open circuit voltage of 1.0 V and a maximum power density of 1.5 W/cm2. Thus, the EPD method could be used as a colloidal process to prepare YSZ thin-film electrolytes for SOFCs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2000.tb01491.x
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  • 3
    Electronic Resource
    Electronic Resource
    Catalytic decomposition of CFCs (1998)
    Springer
    Catalysis surveys from Japan 2 (1998), S. 165-173 
    Details
    ISSN: 1572-8803
    Keywords: chlorofluorocarbons ; catalytic decomposition ; metal oxides ; metalphosphates ; hydrolysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Catalytic decomposition of CCI2F2 was studied over a number of single and complex metal oxides using a fixed-bed reactor. The ZrO2–Cr2O2 catalyst exhibited the highest activity and CO2 and CCIF3 were formed at 350–450°C. Selective decomposition of CCI2F2 required the presence of both oxygen and water vapor over the catalyst. Catalytic activity gradually declined with time on stream because of the fluorination of ZrO2. Treatment of the catalyst with both oxygen and water vapor promoted the removal of fluoride ions in sub-surface layers of the catalyst, which is effective for the recovery of the activity. CCI2F2 was decomposed at 300–450°C over AIPO4. No fluorination of the AIPO4 catalyst took place after the reaction for 1000 h. CH2FCF3, an alternative CFC, was completely decomposed over the mixed catalyst of Ce promoted AIPO4 and Cr2O3 at 400–500°C. Catalytic decomposition is a rational method for destruction of used CFCs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019094828720
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  • 4
    Electronic Resource
    Electronic Resource
    Ni-Fe Bimetallic Anode for Intermediate Temperature Solid Oxide Fuel Cells Using LaGaO〈sub〉3〈/sub〉 Based Oxide Electrolyte (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 1350-1355 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Effects of various additives to Ni anode on SOFC using La0.9Sr0.1Ga0.8Mg0.2O3 basedoxide were investigated in this study. Among the examined additives, it was found that theaddition of small amount of Fe is highly effective for increasing the anodic activity. When 5 wt%Fe was added to Ni anode, the anodic overpotential was as small as 34 mV at 873 K, 0.1A/cm2,which is almost half of pure Ni anode. Since the estimated activation energy for anodic reactiondecreased, addition of Fe to Ni seems to be effective for increasing the activity of Ni for anodicreaction. XRD measurement after power generating property suggests that added Fe was formedalloy with Ni. SEM observation shows the high dispersion of Ni metal was sustained by addition ofsmall amount of Fe. Consequently, this study reveals that Ni-Fe bimetal is highly active foranodic reaction of SOFCs at decreased temperature
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.1350.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Development of Honeycomb-Type Solid Oxide Fuel Cell Consisting of LaGaO〈sub〉3〈/sub〉 Electrolyte (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 544-545 (May 2007), p. 969-972 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: La0.9Sr0.1Ga0.8Mg0.2O3 (LSGM) -based honeycomb cell was first time successfully builtand operated in the case of single-wall used condition and the full 4-walls cell one. Powergeneration characteristic of this honeycomb cell was measured from 700°C to 900°C by usingvarious electrochemical techniques including polarization, current interruption and impedancespectrometry. The LSGM honeycomb cell shows the exact high power density compared with theZrO2 based cell at the operating temperature range, and its value is 394 and 252 mW/cm2 at 800°Cand 700°C, respectively. Thermal stability of this honeycomb cell is also studied and it is seen thatthe good performance through several times thermal cycling is observed. The 4-walls’s cell stack issuccessfully working at 800°C, and the volumetric power density is achieved to a value of about700 mW/cm3
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.544-545.969.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of Dye Mixing on Photocatalytic Splitting of H〈sub〉2〈/sub〉O into H〈sub〉2〈/sub〉 and O〈sub〉2〈/sub〉 on KTaO〈sub〉3〈/sub〉 (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 544-545 (May 2007), p. 51-54 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Effects of mixing dye sensitizer for the photocatalytic activity of dye-sensitizedPt/K0.95Ta0.92Zr0.08O3 was investigated. It was found that the photocatalytic activity was greatlyimproved by mixing dye sensitizer on the catalyst, and among the examined combination of organicdyes, the highest photocatalytic activity was obtained by mixing Cr-tetraphenylporphyrin (Cr-TPP)and Pentametylene bis[4-(10, 15, 20-triphenylporphine-5-yl)benzoate] dizinc(ΙΙ) (Zn-TPP dimer).In order to identify the effect of dye sensitizer, photovoltaic behavior of the dye-sensitized KTaO3was investigated. The lifetime of the photo-exited electron and hole can be improved by coatingwith dye sensitizer. Thus, the effect of porphyrinoids would be explained by the improvedefficiency of charge separation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.544-545.51.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Intermediate Temperature Steam Electrolysis Using Doped Lanthanum Gallate Solid Electrolyte (2) Effects of CeO〈sub〉2〈/sub〉 Interlayer on Activity (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 544-545 (May 2007), p. 1005-1008 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Steam electrolysis is attracting much interest method to produce hydrogen andalso the new energy recovery process of wasted heat energy. Up to now, Y2O3stabilized ZrO2 (YSZ) has been used for a solid electrolyte and so the operatingtemperature is limited down to 1273K. This study is focused on increasing theperformance of steam electrolysis by using LaGaO3 based oxide for electrolyte atintermediate temperature of 873 K, which is upper limit of the obtainable wasted heat.It was found that the formation amount of H2 is almost obeyed the Faraday law up to1.8 V suggesting that the ionic transport number of oxide ion in LaGaO3 was kept tobe 1 under the steam electrolysis condition. The electrolyzing current is improved asfollowing order; La0.6Sr0.4CoO3〈Sm0.5Sr0.5CoO3〈〈 Ba0.6La0.4CoO3 for anode andPt〈Ni〈Ni-Fe for cathode, respectively. Hydrogen production rate higher than 100μmol ml-1 min-1 at 873 K and 300 mA cm-2 were successfully demonstrated at 1.8 V inthis study. Electrolysis reaction under various reaction conditions are also presented.The H2 formation rate increased with increasing total flow rate due to the diffusionresistance
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.544-545.1005.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Capacitive Type Gas Sensors (1998)
    Springer
    Journal of electroceramics 2 (1998), S. 215-228 
    Details
    ISSN: 1573-8663
    Keywords: capacitive type sensors ; CO2 ; NO ; humidity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Current status of capacitive type gas sensor were reviewed in this paper. Although the number of publications on capacitive type sensors has been limited so far, capacitive type sensors have good prospects given that the capacitor structure is so simple enabling miniaturization and achieving high reliability and low cost. Among the reported capacitive type sensors, detection of gas based on a change in dielectric layer thickness is most promising. On this point of view, capacitive type CO2 and NO sensors using depletion layer formed at p-n junction of oxide semiconductor were introduced in detail. In addition, commercial capacitive type sensors for monitoring CO2 based on this principle were mentioned. CO2 concentration in office can be successfully monitored by the developed capacitive type CO2 sensor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009970405804
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  • 9
    Electronic Resource
    Electronic Resource
    CO2 Sensing Property of CuO-BaTiO3 Mixed Oxide Film Prepared by Self-Assembled Multibilayer Film as a Precursor (2000)
    Springer
    Journal of electroceramics 4 (2000), S. 207-214 
    Details
    ISSN: 1573-8663
    Keywords: CO2 sensor ; CuO-BaTiO3 mixed oxide film ; self-assembled multibilayer film
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Preparation of CuO-BaTiO3 mixed oxide thin film by the decomposition of a self-assembled multibilayer film as a molecular template was investigated in this study. Furthermore, CO2 sensing property of the resultant thin film was investigated as a capacitive type sensor. The self-assembled bilayer film of few 1000 layers thickness can be obtained easily by casting an aqueous suspension consisting of dimethyldihexadecylammoiun bromide (DC1-16), Cu(ClO4)2, Ba(TiO(C2H4)2), 2,6-dimetyle-3,5heptadione (DHP), and polyvinyl alcohol. Divalent copper ion (Cu2+)) which is associated with 2 DHP molecules was incorporated into the molecular bilayer film and BaTiO3 precursor exists at the interspace of molecular bilayer film by coordinating with polyvinyl alcohol. Upquenching the organic-inorganic film at 1173 K leads to the uniform film of CuO-BaTiO3 oxide mixture. Although operating temperature shifted to higher temperature, the resultant film exhibits the capacitance change upon exposure to CO2. Consequently, it is concluded that the mixed oxide film of CuO-BaTiO3 prepared by the decomposition of multibilayer film was also an appropriate capacitive type CO2 sensor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009932414244
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  • 10
    Electronic Resource
    Electronic Resource
    Solid-phase modification of chitosan hydrogel membranes and permeability properties of modified chitosan membranes (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 50 (1993), S. 1665-1670 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A novel preparation method for modified chitosan membranes was developed. Chitosan hydrogel membranes were prepared by immersing an aqueous acetic acid solution of chitosan in KOH solution and modified with 3,3′-dithiodipropionic acid (DTPA), which has a functional group that causes the thiol ↔ disulfide transition through a redox reaction. It was smoothly modified with DTPA even in a solid-phase modification when carbodiimides were used as the condensing reagents. The chitosan membrane modified with DTPA was reduced with tri-n-butyl phosphine (MSH membrane) and then oxidized with iodine (MSS membrane). Permeabilities of KCl, sucrose, and urea through these modified chitosan membranes were investigated. The permeability of urea was quite high and followed by KCl and sucrose in that order. The permeabilities of KCl and sucrose through the MSS membrane showed a decrease compared to those through the MSH membrane. The thiol ↔ disulfide transition was responsible for changes in the permeabilities of KCl and sucrose. The permeability of urea was almost the same for both membrane systems, i.e., permeation of urea was not affected by the thiol ↔ disulfide transition, probably due to the break of hydrogen bonding in the membranes. © 1993 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1993.070500921
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