Unexplained transport resistances for low-loaded fuel-cell catalyst layers

2014 ◽  
Vol 2 (41) ◽  
pp. 17207-17211 ◽  
Author(s):  
Adam Z. Weber ◽  
Ahmet Kusoglu
Keyword(s):  
Thin Film ◽  
Fuel Cells ◽  
Fuel Cell ◽  
Mass Transport ◽  
Polymer Electrolyte ◽  
Polymer Electrolyte Fuel Cells ◽  
Fuel Cell Catalyst ◽  
Catalyst Layers

Mass-transport limitations due to the resistances caused by the ionomer thin-film surrounding the catalyst sites must be mitigated to achieve the desired performance with low catalyst loadings, a key for the commercialization of polymer-electrolyte fuel cells.

scholarly journals Mass-transport properties of electrosprayed Pt/C catalyst layers for polymer-electrolyte fuel cells

2019 ◽  
Vol 427 ◽  
pp. 250-259 ◽  
Author(s):  
Julio J. Conde ◽  
M. Antonia Folgado ◽  
P. Ferreira-Aparicio ◽  
Antonio M. Chaparro ◽  
Anamika Chowdhury ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Mass Transport ◽  
Transport Properties ◽  
Polymer Electrolyte ◽  
Polymer Electrolyte Fuel Cells ◽  
Catalyst Layers

Measurement of a new parameter representing the gas transport properties of the catalyst layers of polymer electrolyte fuel cells

2016 ◽  
Vol 18 (18) ◽  
pp. 13066-13073 ◽  
Author(s):  
Hiroshi Iden ◽  
Atsushi Ohma ◽  
Tomomi Tokunaga ◽  
Kouji Yokoyama ◽  
Kazuhiko Shinohara
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Transport Properties ◽  
Polymer Electrolyte ◽  
Gas Transport ◽  
Polymer Electrolyte Fuel Cells ◽  
Cell Performance ◽  
Fuel Cell Performance ◽  
Catalyst Layers ◽  
Gas Transport Properties

The optimization of the catalyst layers is necessary for obtaining a better fuel cell performance and reducing fuel cell cost.

Wetting properties of porous high temperature polymer electrolyte fuel cells materials with phosphoric acid

2019 ◽  
Vol 21 (24) ◽  
pp. 13126-13134 ◽  
Author(s):  
J. Halter ◽  
T. Gloor ◽  
B. Amoroso ◽  
T. J. Schmidt ◽  
F. N. Büchi
Keyword(s):  
Fuel Cells ◽  
High Temperature ◽  
Fuel Cell ◽  
Phosphoric Acid ◽  
Polymer Electrolyte ◽  
Polymer Electrolyte Fuel Cells ◽  
Polymer Electrolyte Fuel Cell ◽  
Wetting Behavior ◽  
Wetting Properties ◽  
Fuel Cell Materials

The influence of phosphoric acid temperature and concentration on the wetting behavior of porous high temperature polymer electrolyte fuel cell materials is investigated.

Effectiveness factor of Pt utilization in cathode catalyst layer of polymer electrolyte fuel cells

2008 ◽  
Vol 86 (7) ◽  
pp. 657-667 ◽  
Author(s):  
Zetao Xia ◽  
Qianpu Wang ◽  
Michael Eikerling ◽  
Zhongsheng Liu
Keyword(s):  
Fuel Cells ◽  
Polymer Electrolyte ◽  
Catalyst Layer ◽  
Polymer Electrolyte Fuel Cells ◽  
Effectiveness Factor ◽  
Cathode Catalyst ◽  
Catalyst Layers ◽  
Effectiveness Factors ◽  
Cathode Catalyst Layer ◽  
Pt Utilization

In this work, we analyze effectiveness factors of Pt utilization in perfluorosulfonate ionomer (PFSI) bonded thin film cathode catalyst layers of polymer electrolyte fuel cells. We define the effectiveness factor of Pt utilization as the apparent rate of current conversion exhibited by a specific catalyst layer design divided by the ideal rate obtained if all Pt atoms were used equally in electrochemical reactions at the specified electrode overpotential and externally provided reactant concentrations. This definition includes statistical factors at all relevant scales as well as non-uniformities of reaction rate distributions under operation. Our model is based on the random composite agglomerated morphology of the catalyst layer. It accounts for the interplay of transport phenomena and electrochemical kinetics. At the mesoscopic scale, limited effectiveness of Pt utilization in agglomerates is mainly an electrostatic effect. We determined spatial distributions of effectiveness factors of agglomerates in the through-plane direction, and thereafter calculated overall effectiveness factors of the cathode catalyst layer. Our results show that small agglomerate radius, low operating current density, high operating temperature, and high oxygen partial pressure result in high effectiveness factors of Pt utilization. Finally, we compared PFSI-bonded thin film cathode catalyst layers with ultrathin two-phase cathode catalyst layers in terms of effectiveness factors. Including the surface to volume atom ratio of Pt nanoparticles, the two different types of structures exhibit similar effectiveness factors of Pt utilization, which are found to be distinctly below 10%.Key words: polymer electrolyte fuel cells, fuel cell modeling, cathode catalyst layer, Pt utilization, effectiveness factor.

Nafion Ionomer Aggregation and its Influence on Proton Conduction and Mass Transport in Fuel Cell Catalyst Layers

2019 ◽  
Vol 16 (2) ◽  
pp. 1811-1816 ◽  
Author(s):  
Zhong Xie ◽  
Titichai Navessin ◽  
Xinsheng Zhao ◽  
Makoto Adachi ◽  
Steven Holdcroft ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Mass Transport ◽  
Proton Conduction ◽  
Fuel Cell Catalyst ◽  
Catalyst Layers
Sign in / Sign up

Export Citation Format

Share Document