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  • fuel cells  (2)
  • 82.50.-m  (1)
  • 82.80 Bi  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Preparation, morphology and effective electrocatalytic activity of gas evolving and gas consuming electrodes
    Amsterdam : Elsevier
    Electrochimica Acta 39 (1994), S. 1749-1756 
    Details
    ISSN: 0013-4686
    Keywords: electrocatalysis ; fuel cells ; gas evolving electrodes ; water electrolysis
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0013-4686(94)85160-3
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Laser desorption jet-cooling of organic molecules (1990)
    Springer
    Applied physics 51 (1990), S. 395-403 
    Details
    ISSN: 1432-0649
    Keywords: 35.80 s ; 82.80 Bi ; 47.45 Nd
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Laser desorption followed by jet-cooling allows wavelength-selective as well as mass-selective detection of molecules desorbed from a surface without fragmentation. The cooling characteristics and detection sensitivity of laser desorption jet-cooling of organic molecules are investigated. From the rotational contour of the electronic origin of the S 1 ← S 0 transition of laser-desorbed anthracene, rotational cooling to 5–10 K is demonstrated. Vibrational cooling is studied for laser-desorbed diphenylamine, a molecule with low-energy vibrations, and a vibrational temperature below 15 K is found. The absolute detection sensitivity is determined for the perylene molecule. Using two-color (1+1) resonance enhanced multi-photon ionization (with a measured ionization efficiency of 0.25) for detection, it is found that one ion is produced in the detection region for every 2×105 perylene molecules evaporated from the desorption laser spot. A two-color (1+1) REMPI spectrum (400 points) of perylene is recorded using only 30 picogram of material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00329101
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Laser FM spectroscopy with photochemical modulation (1984)
    Springer
    Applied physics 35 (1984), S. 105-111 
    Details
    ISSN: 1432-0649
    Keywords: 0.7.65.Eh ; 82.50.-m ; 33.20.Kf
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have combined the techniques of frequency-modulation spectroscopy (FMS) and photochemical-modulation spectroscopy to carry out high-resolution, high-sensitivity absorption measurements on the formyl and amino radicals. Using the (0,90, 0)-(0,01, 0) band of theÃ,2 A″- $$\tilde X$$ ,2 A′ transition of HCO at 614 nm, we obtained a sensitivity limit for absorption of 1.5×10−6. Reconstructed spectra of several HCO lines are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00697429
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Porosity and catalyst utilization of thin layer cathodes in air operated PEM-fuel cells (1998)
    Springer
    Journal of applied electrochemistry 28 (1998), S. 277-282 
    Details
    ISSN: 1572-8838
    Keywords: fuel cells ; PEMFC ; oxygen cathode ; electrode porosity ; mass transport
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Better performance of and higher electrocatalyst utilization in proton-exchange membrane fuel cells equipped with thin film electrodes is achieved by exploiting pore forming additives in the electrode recipe formulation. Preparing the membrane–electrode assembly by a hot spraying procedure already provides 35% porosity. Additional coarse porosity is obtained by adding pore formers to the electrocatalyst slurry which is used for the hot spraying process. This allows for a better access of oxygen from air to the depth of the cathode. For air operation at ambient pressure and low catalyst loading of 0.15mgPtcm-2 a current density of 200mAcm-2 at 0.7V cell voltage can be obtained with such electrodes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003259531775
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    Paper (German National Licenses)
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