This talk addresses the Oxygen Reduction Reaction (ORR) utilizing Fe- and Co-based non precious metal (NPM) catalysts.  There has long been uncertainty as to the active site for ORR in these materials due to the heterogeneity of the as-prepared catalyst.  We have developed several methods with which to interrogate these materials.  First,  by using a purification scheme which removes and then remetallates the active site we substantially reduce catalyst heterogeneity.  Second, we have developed a method by which to poison some of these active sites.  Third, we use magnetic measurements to probe those sites affected by poisoning.  We show as well that there is a minimum metal requirement for high ORR activity and that the metal must be arranged in certain critical configurations.<br/> <br/>

Identification of active species and mechanisms in non-precious metal oxygen reduction catalysts by poisoning and magnetic measurements

2019 Fall National Meeting

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.