Evolution of the PtNi Bimetallic Alloy Fuel Cell Catalyst under Simulated Operational Conditions

2020 ◽  
Vol 12 (15) ◽  
pp. 17602-17610 ◽  
Author(s):  
Ivan Khalakhan ◽  
Marco Bogar ◽  
Mykhailo Vorokhta ◽  
Peter Kúš ◽  
Yurii Yakovlev ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Operational Conditions ◽  
Fuel Cell Catalyst ◽  
Bimetallic Alloy

scholarly journals Electron Tomography of PEM Fuel Cell Catalyst Coarsening on Alternate Carbon Supports

2017 ◽  
Vol 23 (S1) ◽  
pp. 2090-2091
Author(s):  
Brian T. Sneed ◽  
David A. Cullen ◽  
Kimberly S. Reeves ◽  
Karren L. More
Keyword(s):  
Fuel Cell ◽  
Electron Tomography ◽  
Pem Fuel Cell ◽  
Carbon Supports ◽  
Fuel Cell Catalyst ◽  
Pem Fuel Cell Catalyst

Tracking the Catalyst Layer Depth-Dependent Electrochemical Degradation of a Bimodal Pt/C Fuel Cell Catalyst: A Combined Operando Small- and Wide-Angle X-Ray Scattering Study

2021 ◽  
Author(s):  
Johanna Schröder ◽  
Rebecca K. Pittkowski ◽  
Isaac Martens ◽  
Raphaël Chattot ◽  
Jakub Drnec ◽  
...  
Keyword(s):  
Particle Size ◽  
Fuel Cell ◽  
Ostwald Ripening ◽  
Catalyst Layer ◽  
Wide Angle ◽  
Layer Depth ◽  
X Ray ◽  
Fuel Cell Catalyst ◽  
X Ray Scattering ◽  
Size Population

The combination of operando small- and wide-angle X-ray scattering (SAXS, WAXS) is here presented to provide insights into the changes in mean particle sizes and phase fractions in fuel cell catalyst layers during accelerated stress tests (ASTs). As fuel cell catalyst, a bimodal Pt/C catalyst was chosen that consists of two distinguishable particle size populations. The presence of the two different sizes should favor and uncover electrochemical Ostwald ripening as degradation mechanism, i.e., the growth of larger particles in the Pt/C catalyst at the expense of the smaller particles via the formation of ionic metal species. However, instead of electrochemical Ostwald ripening, the results point toward classical Ostwald ripening via the local diffusion of metal atoms on the support. Furthermore, the grazing incidence mode provides insights into the catalyst layer depth-dependent degradation. While the larger particles show the same particle size changes close to the electrolyte-catalyst interface and within the catalyst layer, the smaller Pt nanoparticles exhibit a slightly decreased size at the electrolyte-catalyst interface. During the AST, both size populations increase in size, independent of the depth. Their phase fraction, i.e., the ratio of smaller to larger size population, however, exhibits a depth-dependent behavior. While at the electrolyte-catalyst interface the phase fraction of the smaller size population decreases, it increases in the inner catalyst layer. The results of a depth-dependent degradation suggest that employing a depth-dependent catalyst design can be used for future improvement of catalyst stability.

A Methodology for Assessing Fuel Cell Performance Under a Wide Range of Operational Conditions: Results for Single Cells

2006 ◽  
Vol 3 (3) ◽  
pp. 226-233 ◽  
Author(s):  
Andrea Baratella ◽  
Roberto Bove ◽  
Piero Lunghi
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Single Cells ◽  
Cell Performance ◽  
Effective Parameters ◽  
Test Procedures ◽  
Operational Conditions ◽  
Fuel Cell Performance ◽  
Wide Range ◽  
The University

Testing the performance of fuel cells is an important key for verifying technology improvements and for demonstrating their potential. However, due to the novelty of this technology, there is not a standardized procedure for testing fuel cell performance. In order to fully investigate fuel cell performance, the behavior must be known under a wide range of operational conditions. Furthermore, in order to compare results coming from different test teams, a set of procedures and parameters to evaluate single cell performance should be defined. The research group of the Fuel Cell Laboratory of the University of Perugia is conducting performance tests on single cells, focusing on defining test procedures to find effective parameters to be used to compare tests performed by different teams. This work demonstrates how the testing parameters developed by the team allow one to perform advanced control on test procedures, to understand test results, and to compare them with tests carried out under different operational conditions. The entire analysis is easily conducted by using a single parameter variation hyperspace approach. The experimental results obtained on single fuel cells are reported.

Gravure Coating for Roll-to-Roll Manufacturing of Proton-Exchange-Membrane Fuel Cell Catalyst Layers

2018 ◽  
Vol 165 (11) ◽  
pp. F1012-F1018 ◽  
Author(s):  
Scott A. Mauger ◽  
K. C. Neyerlin ◽  
Ami C. Yang-Neyerlin ◽  
Karren L. More ◽  
Michael Ulsh
Keyword(s):  
Fuel Cell ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Fuel Cell Catalyst ◽  
Catalyst Layers ◽  
Roll To Roll ◽  
Exchange Membrane

Electron Promotion by Surface Functional Groups of Single Wall Carbon Nanotubes to Overlying Metal Particles in a Fuel-Cell Catalyst

2012 ◽  
Vol 124 (28) ◽  
pp. 7104-7107 ◽  
Author(s):  
Patraporn Luksirikul ◽  
Karaked Tedsree ◽  
Mark G. Moloney ◽  
Malcolm L. H. Green ◽  
Shik Chi Edman Tsang
Keyword(s):  
Carbon Nanotubes ◽  
Fuel Cell ◽  
Functional Groups ◽  
Metal Particles ◽  
Single Wall Carbon Nanotubes ◽  
Surface Functional Groups ◽  
Single Wall Carbon ◽  
Fuel Cell Catalyst
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