By Dr. Christoph Hartnig, Dr. Christina Roth

ISBN-10: 184569774X

ISBN-13: 9781845697747

Polymer electrolyte membrane gasoline cells (PEMFCs) and direct methanol gasoline cells (DMFCs) know-how signify promising low-temperature electrochemical energy new release applied sciences that function on hydrogen and methanol respectively. those applied sciences have attracted excessive around the world commercialization learn and improvement efforts with a wide component of those efforts directed at fabrics advancements for gas cellphone sturdiness and long-term operation.This quantity set provides a accomplished and targeted overview of the basics, functionality, and in situ characterization of PEMFCs and DMFCs.  quantity 2 information in situ characterization, together with experimental and cutting edge recommendations used to appreciate gasoline cellphone operational concerns and fabrics functionality. the outlet part reports more desirable options for characterization of catalyst actions and procedures, akin to X-ray absorption and scattering, complicated microscopy and electrochemical mass spectrometry. Chapters partly overview characterization ideas for water and gasoline administration, together with neutron radiography and tomography, magnetic resonance imaging and Raman spectroscopy. the realization specializes in in the community resolved characterization equipment, from temporary strategies and electrochemical microscopy, to laser-optical equipment and synchrotron radiography.

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As a consequence, high electron doses are necessary during the exposure. Since high electron doses accelerate the degradation of the polymer electrolyte, it is necessary to know the degradation rate to reliably interpret the obtained fluorine concentration maps. For a first estimation, an EELS sequence was acquired from the membrane at electron doses similar to that used for the acquisition of the energy-filtered images. 5% per minute were determined by integration of the intensity of the fluorine edge from the sequence of the EEL spectra.

Made of the same material as the catalyst, using the same experimental set-up. The accurate EXAFS analysis of that sample should provide several important reference values such as σj2 and S02 to be used in successive analysis of the nanocatalyst. g. at room temperature). The obtained S02 value for the bulk sample should not be changed when analysing the EXAFS signal of the nano-catalyst as it is strongly correlated with the signals degeneracies (parameters Nj in Eq. 2 or functions N(n) in Eq.

A substantial decrease of the degeneracies is observable for Pt particles with diameters smaller than 4–5 nm. 7 Calculated trend of the degeneracies of 2-body and 3-body configurations for a quasi-spherical particle of Pt as a function of the particle diameter. The horizontal dashed lines indicate the expected degeneracies for bulk Pt particles. (Source: dapted from Witkowska et al. ) realistic evaluation of nano-particle diameters if complemented by the coordination numbers obtained by a robust EXAFS analysis.

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Polymer electrolyte membrane and direct methanol fuel cell technology: Volume 2: In situ characterization techniques for low temperature fuel cells by Dr. Christoph Hartnig, Dr. Christina Roth

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