scholarly journals Tunable synthetic approaches for the optimization of nanostructured fuel cell catalysts: An overview

2004 ◽  
Vol 58 (6) ◽  
pp. 271-279 ◽  
Author(s):  
H. Bönnemann ◽  
K.S. Nagabhushana
Keyword(s):  
Particle Size ◽  
Fuel Cell ◽  
Catalytic Properties ◽  
Metal Catalysts ◽  
Highly Active ◽  
Fuel Cell Catalysts ◽  
Metal Composition ◽  
Synthetic Methodologies ◽  
Synthetic Approaches ◽  
Nanostructured Metal

Highly active nanostructured pluri-metal catalysts for fuel cell applications can be obtained by designing synthetic protocol where the particle size, metal composition and morphology can be readily tailored. Tunable synthesis relates to combining the various synthetic methodologies available for generating nanostructured metal catalysts with desired catalytic properties. Herein, we discuss some of these synthetic methodologies which were developed to combine the advantages of each pathway in generating efficient fuel cell catalysts and to learn how the composition and morphology of the metals be fine tuned.

Particle Size Analysis for Fuel Cell Catalysts Using Electron Microscopy: Bright Field or HAADF Images?

2012 ◽  
Vol 18 (S2) ◽  
pp. 1364-1365 ◽  
Author(s):  
Y. Zhao ◽  
Y. Tang ◽  
G. Vaughan ◽  
D. Ozkaya
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Fuel Cell ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Bright Field ◽  
Fuel Cell Catalysts

Extended abstract of a paper presented at Microscopy and Microanalysis 2012 in Phoenix, Arizona, USA, July 29 – August 2, 2012.

scholarly journals A New Approach to Probe the Degradation of Fuel Catalysts Under Realistic Conditions: Combining Tests in a Gas Diffusion Electrode Setup with Small Angle X-Ray Scattering

2020 ◽  
Author(s):  
Johanna Schröder ◽  
Jonathan Quinson ◽  
Jette K. Mathiesen ◽  
Jacob J. K. Kirkensgaard ◽  
Shima Alinejad ◽  
...  
Keyword(s):  
Particle Size ◽  
Fuel Cell ◽  
Particle Size Distribution ◽  
Small Angle ◽  
Catalyst Layer ◽  
Gas Diffusion ◽  
New Approach ◽  
X Ray ◽  
X Ray Scattering ◽  
Fuel Cell Catalysts

A new approach for efficiently investigating the degradation of fuel cell catalysts under realistic conditions is presented combining accelerated stress tests (ASTs) in a gas diffusion electrode (GDE) setup with small angle X-ray scattering (SAXS). GDE setups were recently introduced as a novel testing tool combining the advantages of classical electrochemical cells with a three-electrode setup and membrane electrode assemblies (MEAs). SAXS characterization of the catalyst layer enables an evaluation of the particle size distribution of the catalyst and its changes upon applying an AST. The straight-forward approach not only enables stability testing of fuel cell catalysts in a comparative and reproducible manner, it also allows mechanistic insights into the degradation mechanism. In contrast to standard rotating disk electrode measurements or identical location microscopy, typical metal loadings for proton exchange membrane fuel cells (PEMFCs), i.e. 0.2 mgPt cm-2geo, are applied in the GDE and the degradation of the overall (whole) catalyst layer is probed. For the first time, realistic degradation tests can be performed comparing a set of catalysts with several repeats within reasonable time. It is demonstrated that independent of the initial particle size in the pristine catalyst, for ASTs simulating load cycle conditions in a PEMFC, all catalysts degrade to a similar particle size distribution. <br>

scholarly journals A New Approach to Probe the Degradation of Fuel Catalysts Under Realistic Conditions: Combining Tests in a Gas Diffusion Electrode Setup with Small Angle X-Ray Scattering

2020 ◽  
Author(s):  
Johanna Schröder ◽  
Jonathan Quinson ◽  
Jette K. Mathiesen ◽  
Jacob J. K. Kirkensgaard ◽  
Shima Alinejad ◽  
...  
Keyword(s):  
Particle Size ◽  
Fuel Cell ◽  
Particle Size Distribution ◽  
Small Angle ◽  
Catalyst Layer ◽  
Gas Diffusion ◽  
New Approach ◽  
X Ray ◽  
X Ray Scattering ◽  
Fuel Cell Catalysts

A new approach for efficiently investigating the degradation of fuel cell catalysts under realistic conditions is presented combining accelerated stress tests (ASTs) in a gas diffusion electrode (GDE) setup with small angle X-ray scattering (SAXS). GDE setups were recently introduced as a novel testing tool combining the advantages of classical electrochemical cells with a three-electrode setup and membrane electrode assemblies (MEAs). SAXS characterization of the catalyst layer enables an evaluation of the particle size distribution of the catalyst and its changes upon applying an AST. The straight-forward approach not only enables stability testing of fuel cell catalysts in a comparative and reproducible manner, it also allows mechanistic insights into the degradation mechanism. In contrast to standard rotating disk electrode measurements or identical location microscopy, typical metal loadings for proton exchange membrane fuel cells (PEMFCs), i.e. 0.2 mgPt cm-2geo, are applied in the GDE and the degradation of the overall (whole) catalyst layer is probed. For the first time, realistic degradation tests can be performed comparing a set of catalysts with several repeats within reasonable time. It is demonstrated that independent of the initial particle size in the pristine catalyst, for ASTs simulating load cycle conditions in a PEMFC, all catalysts degrade to a similar particle size distribution. <br>

A New Approach to Probe the Degradation of Fuel Catalysts Under Realistic Conditions: Combining Tests in a Gas Diffusion Electrode Setup with Small Angle X-Ray Scattering

2020 ◽  
Author(s):  
Johanna Schröder ◽  
Jonathan Quinson ◽  
Jacob J. K. Kirkensgaard ◽  
Shima Alinejad ◽  
Vladislav A. Mints ◽  
...  
Keyword(s):  
Particle Size ◽  
Fuel Cell ◽  
Particle Size Distribution ◽  
Small Angle ◽  
Catalyst Layer ◽  
Gas Diffusion ◽  
New Approach ◽  
X Ray ◽  
X Ray Scattering ◽  
Fuel Cell Catalysts

A new approach for efficiently investigating the degradation of fuel cell catalysts under realistic conditions is presented combining accelerated stress tests (ASTs) in a gas diffusion electrode (GDE) setup with small angle X-ray scattering (SAXS). GDE setups were recently introduced as a novel testing tool combining the advantages of classical electrochemical cells with a three-electrode setup and membrane electrode assemblies (MEAs). SAXS characterization of the catalyst layer enables an evaluation of the particle size distribution of the catalyst and its changes upon applying an AST. The straight-forward approach not only enables stability testing of fuel cell catalysts in a comparative and reproducible manner, it also allows mechanistic insights into the degradation mechanism. In contrast to standard rotating disk electrode measurements or identical location microscopy, typical metal loadings for proton exchange membrane fuel cells (PEMFCs), i.e. 0.2 mgPt cm-2geo, are applied in the GDE and the degradation of the overall (whole) catalyst layer is probed. For the first time, realistic degradation tests can be performed comparing a set of catalysts with several repeats within reasonable time. It is demonstrated that independent of the initial particle size in the pristine catalyst, for ASTs simulating load cycle conditions in a PEMFC, all catalysts degrade to a more or less identical particle size distribution. The presented new approach will help to pave the way to develop improved PEMFC catalysts.

Particle Size Effect on Platinum Dissolution: Considerations for Accelerated Stability Testing of Fuel Cell Catalysts

ACS Catalysis ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 6281-6290 ◽  
Author(s):  
Daniel J. S. Sandbeck ◽  
Niklas Mørch Secher ◽  
Florian D. Speck ◽  
Jakob Ejler Sørensen ◽  
Jakob Kibsgaard ◽  
...  
Keyword(s):  
Particle Size ◽  
Fuel Cell ◽  
Size Effect ◽  
Particle Size Effect ◽  
Stability Testing ◽  
Accelerated Stability ◽  
Fuel Cell Catalysts ◽  
Platinum Dissolution

scholarly journals Advancements in rationally designed PGM-free fuel cell catalysts derived from metal–organic frameworks

2017 ◽  
Vol 4 (1) ◽  
pp. 20-37 ◽  
Author(s):  
Heather M. Barkholtz ◽  
Di-Jia Liu
Keyword(s):  
Fuel Cell ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Metal Organic Frameworks ◽  
Reduction Reaction ◽  
Comprehensive Review ◽  
Highly Active ◽  
Fuel Cell Catalysts ◽  
Metal Organic

A comprehensive review revealed metal–organic frameworks as promising precursors for preparing highly active PGM-free electro-catalysts for oxygen reduction reaction.

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