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Overall hydrogen starvation

Overall hydrogen starvation is defined as a state where the hydrogen supply is not sufficient to maintain the current demand. Provided that there are normally operating cells in a stack or there is an external power supply, the current is forced through the hydrogen-starved cell. As a consequence, alternative oxidation reactions have to take place in order to maintain the required flux of electrons and protons. Possible reactions are the oxidation of the carbon support and the... [Pg.553]

Figure 20.5 Gas and potential distribution within a PEMFC at overall hydrogen starvation. Figure 20.5 Gas and potential distribution within a PEMFC at overall hydrogen starvation.
As a summary, we conclude that overall hydrogen starvation results in negative cell voltage and carbon corrosion in addition to water oxidation within the anode catalyst layer. Degradation reaction rates increase with decreasing fuel stoichiometry. [Pg.555]

Measurement of the single cell voltages in a stack allows the detection of cell reversals due to overall hydrogen or oxygen starvation. As soon as the minimum cell voltage falls below a given lower limit, it is possible to prevent cell degradation by reduction of the cell current. [Pg.564]

See other pages where Overall hydrogen starvation is mentioned: [Pg.553]    [Pg.553]    [Pg.554]    [Pg.558]    [Pg.562]    [Pg.1243]    [Pg.553]    [Pg.553]    [Pg.554]    [Pg.558]    [Pg.562]    [Pg.1243]    [Pg.106]    [Pg.12]    [Pg.554]    [Pg.116]    [Pg.96]    [Pg.107]    [Pg.184]    [Pg.303]    [Pg.15]    [Pg.225]   
See also in sourсe #XX -- [ Pg.553 , Pg.554 ]



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