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Polymer electrolyte fuel cells (PEFCs) or proton exchange m- brane
fuel cells (PEMFCs) have been suggested as alternatives to replace
many existing energy conversion technologies, incl-
inginternalcombustionenginesandbatteries.Themostsigni?cant advances
in PEFC technology achieved in the last decade have
occurredinareasrelatedtoautomotiveapplications,namelyco- start
capabilities, enhanced durability and better understanding of
watermanagementandmasstransportlosses. This volume of Modern
Aspects of Electrochemistry is
intendedtoprovideanoverviewofadvancementsinexperimental
diagnosticsandmodelingofpolymerelectrolytefuelcells.Chapters
byHuangandReifsniderandGuetal.provideanin-depthreview of the
durability issues in PEFCs as well as recent developments in
understanding and mitigation of degradation in the polymer
membraneandelectrocatalyst. Enabling cold start, the startup of
PEFC stacks from subzero temperatures, is a very important
capability achieved only within
thelastfewyears.TajiriandWangprovideatutorialoverviewofthe
requirementsforcoldstart,andprovideasummaryofexperimental
diagnosticsandcold-startmodelingstudies. Chapters 4-6 address
speci?c diagnostic methods in PEFCs. Martin et al. provide a
detailed review of methods for distributed diagnostics of species,
temperature, and current in PEFCs in Chapter 4.In Chapter 5, Hussey
and Jacobson describe the op-
ationalprinciplesofneutronradiographyforin-situvisualizationof
liquidwaterdistribution,andalsooutlineissuesrelatedtotemporal
andspatialresolution.TsushimaandHiraidescribebothmagnetic resonance
imaging (MRI) technique for visualization of water in
PEFCsandtunablediodelaserabsorptionspectroscopy (TDLAS)
formeasurementofwatervaporconcentrationinChapter6.
Diffusionmedia(DM)areproneto?oodingwithliquidwater.
AlthoughtheDMisanessentialcomponentofPEFCsthatenable
distributionofspeciesandcollectionofcurrentandheat,littlewas
knownaboutcapillarytransportinDMsuntilrecently.InChapters7 Gostick
et al. provide a description of liquid water transport in
porousDMduetocapillarityanddescribeexperimentaltechniques
usedtocharacterizeDMproperties. v vi Preface
The?naltwochaptersdiscussmodelingofPEFCs.Mukherjee and Wang provide
an in-depth review of meso-scale modeling of two-phase transport,
while Zhou et al. summarize both the s- ulation of electrochemical
reactions on electrocatalysts and the transport of protons through
the polymer electrolyte using at-
isticsimulationtoolssuchasmoleculardynamicsandMonteCarlo
techniques. Eachchapterinthevolumeisself-contained;thereforetheydo
notneedtobereadinacertainorder. Special thanks are due to 23
authors who contributed to this volume.
Polymer electrolyte fuel cells (PEFCs) or proton exchange m- brane
fuel cells (PEMFCs) have been suggested as alternatives to replace
many existing energy conversion technologies, incl-
inginternalcombustionenginesandbatteries.Themostsigni?cant advances
in PEFC technology achieved in the last decade have
occurredinareasrelatedtoautomotiveapplications,namelyco- start
capabilities, enhanced durability and better understanding of
watermanagementandmasstransportlosses. This volume of Modern
Aspects of Electrochemistry is
intendedtoprovideanoverviewofadvancementsinexperimental
diagnosticsandmodelingofpolymerelectrolytefuelcells.Chapters
byHuangandReifsniderandGuetal.provideanin-depthreview of the
durability issues in PEFCs as well as recent developments in
understanding and mitigation of degradation in the polymer
membraneandelectrocatalyst. Enabling cold start, the startup of
PEFC stacks from subzero temperatures, is a very important
capability achieved only within
thelastfewyears.TajiriandWangprovideatutorialoverviewofthe
requirementsforcoldstart,andprovideasummaryofexperimental
diagnosticsandcold-startmodelingstudies. Chapters 4-6 address
speci?c diagnostic methods in PEFCs. Martin et al. provide a
detailed review of methods for distributed diagnostics of species,
temperature, and current in PEFCs in Chapter 4.In Chapter 5, Hussey
and Jacobson describe the op-
ationalprinciplesofneutronradiographyforin-situvisualizationof
liquidwaterdistribution,andalsooutlineissuesrelatedtotemporal
andspatialresolution.TsushimaandHiraidescribebothmagnetic resonance
imaging (MRI) technique for visualization of water in
PEFCsandtunablediodelaserabsorptionspectroscopy (TDLAS)
formeasurementofwatervaporconcentrationinChapter6.
Diffusionmedia(DM)areproneto?oodingwithliquidwater.
AlthoughtheDMisanessentialcomponentofPEFCsthatenable
distributionofspeciesandcollectionofcurrentandheat,littlewas
knownaboutcapillarytransportinDMsuntilrecently.InChapters7 Gostick
et al. provide a description of liquid water transport in
porousDMduetocapillarityanddescribeexperimentaltechniques
usedtocharacterizeDMproperties. v vi Preface
The?naltwochaptersdiscussmodelingofPEFCs.Mukherjee and Wang provide
an in-depth review of meso-scale modeling of two-phase transport,
while Zhou et al. summarize both the s- ulation of electrochemical
reactions on electrocatalysts and the transport of protons through
the polymer electrolyte using at-
isticsimulationtoolssuchasmoleculardynamicsandMonteCarlo
techniques. Eachchapterinthevolumeisself-contained;thereforetheydo
notneedtobereadinacertainorder. Special thanks are due to 23
authors who contributed to this volume.
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