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US 2025/0167249 A1Published application
Grafted catalyst
AssigneeRobert Bosch GmbH
InventorsNicola Molinari, Karim Gadelrab, Bjoern Stuehmeier, Felipe Mojica
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Abstract
Catalyst with polymeric chains grafted thereto are disclosed. The polymeric chains provide steric hinderance to eliminate or mitigate catalyst poisoning from an ionomer in a fuel cell. In a variation short stiff polymeric chains may be grafted to the catalyst to provide adequate steric hindrance. In a refinement, the polymeric chains are deposited on less active facets of the catalyst.
Claims20
An electrochemical cell comprising:
- a pair of electrodes;
- and
- a plurality of catalyst particles deposited on a catalyst support, each catalyst particle having sections with greater activity, sections with less activity, and polymeric chains grafted to the sections with less activity, the polymeric chains providing steric hindrance proximate the catalyst to reduce catalyst poisoning.
A catalyst layer comprising:
- a catalyst support;
- a catalyst deposited on the catalyst support;
- and
- a plurality of polymeric chains grafted to the catalyst, the plurality of polymeric chains providing steric hindrance to mitigate catalyst poisoning.
1 more element
A method of preparing a catalyst layer comprising:
- providing a catalyst supported by a catalyst support;
- and
- grafting polymeric chains to less active facets of the catalyst.
Dependencies are inferred from the claim text.