{"id":{"repo_id":"buffalo","oai_identifier":"oai:ubir.buffalo.edu:10477/80030"},"canonical_url":"https://search.dev.ndltd.org/etd/buffalo/oai:ubir.buffalo.edu:10477/80030","repository":{"repo_id":"buffalo","name":"Buffalo","base_url":"https://ubir.buffalo.edu/oai/request"},"display":{"title":"Atomically Dispersed Iron Catalysts for Oxygen Reduction and Carbon Dioxide Reduction Reactions","abstract":"Ph.D.","abstract_html":"Ph.D.","abstract_has_math":false,"creators":["Zhang, Hanguang; 0000-0003-4315-6083"],"institution":"State University of New York at Buffalo","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Wu, Gang","Chemical and Biological Engineering"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2019,"date_issued":"2019-07-30T15:11:58Z","date_published":"2019-07-30T15:11:58Z","updated_at":"2026-07-27T19:05:23Z","subjects":["chemical engineering"],"languages":["eng"],"rights":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/10477/80030","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Wu, Gang","Chemical and Biological Engineering"]},{"key":"dc:creator","label":"Author","values":["Zhang, Hanguang; 0000-0003-4315-6083"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2019-07-30T15:11:58Z","2019","2019-05-17 17:46:52"]},{"key":"dc:publisher","label":"Institution","values":["State University of New York at Buffalo"]},{"key":"dc:type","label":"Dc Type","values":["Text","Dissertation"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["chemical engineering"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/10477/80030"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Ph.D.","The transition from non-renewable energy to renewable energy has driven the development of polymer electrolyte fuel cells (PEFCs) using hydrogen fuels to power vehicles free from emissions for sustainable future. However, the high cost of PEFCs is one of the bottlenecks for marketing fuel cell vehicles in large-scale due to the heavy use of expensive platinum group metal catalysts (PGM) for boosting oxygen reduction reaction (ORR), a sluggish electrochemical reaction. Iron-nitrogen-carbon (Fe-N-C) catalysts, a replacement of PGM catalysts, have shown promising activity for ORR in PEFCs as PGM-free catalysts because they contain highly ORR-active Fe-N4 sites formed in the high temperature treatment. However, the ORR activity of current Fe-N-C catalysts is still insufficient to replace PGM catalysts mainly due to their low density of Fe-N4 active sites. This is because Fe in precursors typically tends to form Fe metallic phases over Fe-N4 active sites during high temperature treatment. This dissertation focus on developing Fe-N-C catalysts in high density of Fe-N4 active sites and favorable morphology to achieve high activity and stability for ORR in fuel cells. Chapter 1 summarizes metal-organic frameworks (MOFs) as ideal precursors for preparing Fe-N-C catalysts with decent ORR activity due to their well-defined crystal structure, high surface area and flexible chemistry. In Chapter 2, a facile doping chemistry has been employed to prepare well-defined Fe chemically doped MOF precursor in a controlled manner. Atomically dispersed Fe in Fe-N-C catalysts can be exclusively obtained to build high density of Fe-N4 sites without any Fe metallic phases at optimum Fe content. Such atomically dispersed Fe catalysts with high density of Fe-N4 sites achieve high ORR activity approaching commercial Pt/C catalysts. The Fe content in the synthesis of precursors has be found to be critical to obtain high density of Fe-N4 catalysts with high ORR activity. The promising durability of this atomically dispersed Fe catalyst has been also observed in fuel cells at the practical operation voltages.","**To request an accessible version of the file(s) associated with this item, contact library@buffalo.edu. Please include the item's persistent URL [http://hdl.handle.net/. . .] in your request.**"]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Atomically Dispersed Iron Catalysts for Oxygen Reduction and Carbon Dioxide Reduction Reactions"]}]}],"canonical_facts":{"dc:contributor":["Wu, Gang","Chemical and Biological Engineering"],"dc:creator":["Zhang, Hanguang; 0000-0003-4315-6083"],"dc:date":["2019-07-30T15:11:58Z","2019","2019-05-17 17:46:52"],"dc:description":["Ph.D.","The transition from non-renewable energy to renewable energy has driven the development of polymer electrolyte fuel cells (PEFCs) using hydrogen fuels to power vehicles free from emissions for sustainable future. However, the high cost of PEFCs is one of the bottlenecks for marketing fuel cell vehicles in large-scale due to the heavy use of expensive platinum group metal catalysts (PGM) for boosting oxygen reduction reaction (ORR), a sluggish electrochemical reaction. Iron-nitrogen-carbon (Fe-N-C) catalysts, a replacement of PGM catalysts, have shown promising activity for ORR in PEFCs as PGM-free catalysts because they contain highly ORR-active Fe-N4 sites formed in the high temperature treatment. However, the ORR activity of current Fe-N-C catalysts is still insufficient to replace PGM catalysts mainly due to their low density of Fe-N4 active sites. This is because Fe in precursors typically tends to form Fe metallic phases over Fe-N4 active sites during high temperature treatment. This dissertation focus on developing Fe-N-C catalysts in high density of Fe-N4 active sites and favorable morphology to achieve high activity and stability for ORR in fuel cells. Chapter 1 summarizes metal-organic frameworks (MOFs) as ideal precursors for preparing Fe-N-C catalysts with decent ORR activity due to their well-defined crystal structure, high surface area and flexible chemistry. In Chapter 2, a facile doping chemistry has been employed to prepare well-defined Fe chemically doped MOF precursor in a controlled manner. Atomically dispersed Fe in Fe-N-C catalysts can be exclusively obtained to build high density of Fe-N4 sites without any Fe metallic phases at optimum Fe content. Such atomically dispersed Fe catalysts with high density of Fe-N4 sites achieve high ORR activity approaching commercial Pt/C catalysts. The Fe content in the synthesis of precursors has be found to be critical to obtain high density of Fe-N4 catalysts with high ORR activity. The promising durability of this atomically dispersed Fe catalyst has been also observed in fuel cells at the practical operation voltages.","**To request an accessible version of the file(s) associated with this item, contact library@buffalo.edu. Please include the item's persistent URL [http://hdl.handle.net/. . .] in your request.**"],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/10477/80030"],"dc:language":["eng"],"dc:publisher":["State University of New York at Buffalo"],"dc:rights":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."],"dc:subject":["chemical engineering"],"dc:title":["Atomically Dispersed Iron Catalysts for Oxygen Reduction and Carbon Dioxide Reduction Reactions"],"dc:type":["Text","Dissertation"]},"updated_at":"2026-07-27T19:05:23Z"}