Search Results - "Helmly, Stefan"

Local impact of humidification on degradation in polymer electrolyte fuel cells by Sanchez, Daniel G., Ruiu, Tiziana, Biswas, Indro, Schulze, Mathias, Helmly, Stefan, Friedrich, K. Andreas

“…The water level in a polymer electrolyte membrane fuel cell (PEMFC) affects the durability as is seen from the degradation processes during operation a PEMFC…”
Get full text

Atomic force microscopy studies of conductive nanostructures in solid polymer electrolytes by Hiesgen, Renate, Helmly, Stefan, Morawietz, Tobias, Yuan, Xiao-Zi, Wang, Haijiang, Friedrich, K. Andreas

“…•Different size of conductive structure at LSC and SSC membranes.•Outer skin layer of Aquivion® membrane determined to 5nm.•Different size of conductive areas…”
Get full text

Microscopic analysis of current and mechanical properties of nafion® studied by atomic force microscopy by Hiesgen, Renate, Helmly, Stefan, Galm, Ines, Morawietz, Tobias, Handl, Michael, Friedrich, K Andreas

“…The conductivity of fuel cell membranes as well as their mechanical properties at the nanometer scale were characterized using advanced tapping mode atomic…”
Get full text

Atomic force microscopy and infrared analysis of aging processes of polymer electrolyte membrane fuel cell components by Hiesgen, Renate, Wehl, Ines, Helmly, Stefan, Haug, Andrea, Schulze, Mathias, Bauder, Alexander, Wang, Haijiang, Yuan, Xiao-Zi, Andreas Friedrich, K.

“…► AFM force spectroscopy analysis of degradation of fuel cell microporous layers. ► Adhesion force and energy dissipation depend linear on PTFE content. ►…”
Get full text

Enveloping of catalyst powder by ionomer for dry spray coating in polymer electrolyte membrane fuel cells by Talukdar, Krishan, Helmly, Stefan, Schulze, Mathias, Sanchez, Daniel G., Handl, Michael, Hiesgen, Renate, Kraut, Jürgen, Friedrich, K. Andreas

“…This study presents innovative concepts for improving performance of membrane electrode assemblies (MEAs) prepared by the dry-spraying method introduced by the…”
Get full text