Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • fuel cells  (2)
  • 35.80.+s  (1)
  • 47.45 Nd  (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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 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
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Pulsed laser desorption near a jet orifice: Concentration profiles of entrained perylene vapor (1988)
    Springer
    Applied physics 46 (1988), S. 165-173 
    Details
    ISSN: 1432-0649
    Keywords: 35.80.+s ; 82.80.Di ; 47.45.Nd.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have investigated the entrainment in a jet expansion of material vaporized with a laser pulse from a surface below but closely adjacent to the jet orifice. Jets of He and Ar were used as carriers, and perylene was the test substance. Its distribution in space and time far from the nozzle was measured by laser-induced fluorescence and one-dimensional imaging with an optical multichannel analyzer. The width of the perylene concentration profile was found to be much narrower than the width of the gas expansion, especially in He. This makes it possible to extract a useful portion of the entrained material through a skimmer. Depending on the values of experimental parameters, the center of the profile first appears above, on, or below the jet axis and then moves lower with time. Effects of several parameters on shape and time-dependent position of the profile were investigated. The results can be used to optimize the overlap of the concentration pulse with a skimmer or other probe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00686471
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...