{"id":{"repo_id":"tu-berlin","oai_identifier":"oai:depositonce.tu-berlin.de:11303/24314"},"canonical_url":"https://search.dev.ndltd.org/etd/tu-berlin/oai:depositonce.tu-berlin.de:11303/24314","repository":{"repo_id":"tu-berlin","name":"Technische Universität Berlin","base_url":"https://api-depositonce.tu-berlin.de/server/oai/request"},"display":{"title":"Enhanced performance and durability of shape-controlled octahedral PtNiX catalysts for advanced fuel cell applications","abstract":"The rapid population growth and industrial development has intensified energy demand and climate issues, emphasizing the urgent need to shift from fossil fuels to more sustainable energy alternatives such as “green” hydrogen. Hydrogen fuel cell technologies are attractive as zero-emission solutions in transportation and other power sectors. However, the wider adoption of hydrogen fuel cells is bottlenecked by high costs associated with fuel cell stacks, more specifically of platinum group metal (PGM) catalysts, as well as insufficient performance and limited long-term durability. This thesis addresses the development, characterization, and performance evaluation of advanced octahedral Pt-based cathode ORR catalysts of proton exchange membrane fuel cells (PEMFCs), with a focus on better PGM utilization and enhanced catalyst durability. The work is structured of two primary aspects: i) optimization of catalyst synthesis, including a seed-mediated route for octahedral PtNi nanoparticles with high Pt loading, as well as rhodium and iridium doping to increase electrochemical surface area (ECSA), ORR activity, and stability; and ii) systematic evaluation of the key factors that influence the translation of high catalytic activity from liquid half-cell measurements to membrane electrode assembly (MEA) testing. Detailed studies on the morphology, structure, composition, and ORR performance and durability are conducted using techniques like rotating disk electrode (RDE), floating electrode technique (FET), and MEA. Advanced in situ and online methods were employed for time-resolved and potential-dependent analyses to further understand catalyst mechanisms. In summary, this thesis provides valuable insights into the design of robust and efficient fuel cell catalysts for practical applications.","abstract_html":"The rapid population growth and industrial development has intensified energy demand and climate issues, emphasizing the urgent need to shift from fossil fuels to more sustainable energy alternatives such as “green” hydrogen. Hydrogen fuel cell technologies are attractive as zero-emission solutions in transportation and other power sectors. However, the wider adoption of hydrogen fuel cells is bottlenecked by high costs associated with fuel cell stacks, more specifically of platinum group metal (PGM) catalysts, as well as insufficient performance and limited long-term durability. This thesis addresses the development, characterization, and performance evaluation of advanced octahedral Pt-based cathode ORR catalysts of proton exchange membrane fuel cells (PEMFCs), with a focus on better PGM utilization and enhanced catalyst durability. The work is structured of two primary aspects: i) optimization of catalyst synthesis, including a seed-mediated route for octahedral PtNi nanoparticles with high Pt loading, as well as rhodium and iridium doping to increase electrochemical surface area (ECSA), ORR activity, and stability; and ii) systematic evaluation of the key factors that influence the translation of high catalytic activity from liquid half-cell measurements to membrane electrode assembly (MEA) testing. Detailed studies on the morphology, structure, composition, and ORR performance and durability are conducted using techniques like rotating disk electrode (RDE), floating electrode technique (FET), and MEA. Advanced in situ and online methods were employed for time-resolved and potential-dependent analyses to further understand catalyst mechanisms. In summary, this thesis provides valuable insights into the design of robust and efficient fuel cell catalysts for practical applications.","abstract_has_math":false,"creators":["Pan, Lujin"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Strasser, Peter"],"committee_chairs":[],"committee_members":[],"year":2025,"date_issued":"2025","date_published":"2025","updated_at":"2026-07-27T21:28:31Z","subjects":[],"languages":["en"],"rights":[],"rights_urls":["http://rightsstatements.org/vocab/InC/1.0/"],"identifier_entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://doi.org/10.14279/depositonce-23128"],"render_values":[{"text":"https://doi.org/10.14279/depositonce-23128","href":"https://doi.org/10.14279/depositonce-23128","code":true}]}]},"links":{"outbound_url":"https://depositonce.tu-berlin.de/handle/11303/24314","outbound_label":"Repository record","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Strasser, Peter"]},{"key":"dc:creator","label":"Author","values":["Pan, Lujin"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2025-04-15T13:39:17Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2025-04-15T13:39:17Z"]},{"key":"dc:date.issued","label":"Date","values":["2025"]},{"key":"dc:type","label":"Dc Type","values":["Doctoral Thesis"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]},{"key":"dc:rights.uri","label":"Rights URI","values":["http://rightsstatements.org/vocab/InC/1.0/"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://depositonce.tu-berlin.de/handle/11303/24314","https://doi.org/10.14279/depositonce-23128"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The rapid population growth and industrial development has intensified energy demand and climate issues, emphasizing the urgent need to shift from fossil fuels to more sustainable energy alternatives such as “green” hydrogen. Hydrogen fuel cell technologies are attractive as zero-emission solutions in transportation and other power sectors. However, the wider adoption of hydrogen fuel cells is bottlenecked by high costs associated with fuel cell stacks, more specifically of platinum group metal (PGM) catalysts, as well as insufficient performance and limited long-term durability. This thesis addresses the development, characterization, and performance evaluation of advanced octahedral Pt-based cathode ORR catalysts of proton exchange membrane fuel cells (PEMFCs), with a focus on better PGM utilization and enhanced catalyst durability. The work is structured of two primary aspects: i) optimization of catalyst synthesis, including a seed-mediated route for octahedral PtNi nanoparticles with high Pt loading, as well as rhodium and iridium doping to increase electrochemical surface area (ECSA), ORR activity, and stability; and ii) systematic evaluation of the key factors that influence the translation of high catalytic activity from liquid half-cell measurements to membrane electrode assembly (MEA) testing. Detailed studies on the morphology, structure, composition, and ORR performance and durability are conducted using techniques like rotating disk electrode (RDE), floating electrode technique (FET), and MEA. Advanced in situ and online methods were employed for time-resolved and potential-dependent analyses to further understand catalyst mechanisms. In summary, this thesis provides valuable insights into the design of robust and efficient fuel cell catalysts for practical applications.","Das rasche Bevölkerungswachstum und die industrielle Entwicklung haben die Energienachfrage und die Klimaproblematik verschärft, was die dringende Notwendigkeit unterstreicht, von fossilen Brennstoffen auf nachhaltigere Energiealternativen wie „grünen“ Wasserstoff umzusteigen. Die Wasserstoff-Brennstoffzellentechnologie zeichnet sich dadurch aus, dass sie im Verkehrswesen und in anderen Sektoren emissionsfreie Lösungen bietet. Die breitere Einführung von Wasserstoff-Brennstoffzellen wird jedoch durch die hohen Kosten der Platingruppenmetall-Katalysatoren (PGM) sowie durch die unzureichende Leistung und die begrenzte langfristige Haltbarkeit behindert. Diese Doktorarbeit befasst sich mit der Entwicklung, Charakterisierung und Leistungsbewertung fortschrittlicher oktaedrischer Pt-basierter Kathoden-ORR-Katalysatoren für Protonenaustauschmembran-Brennstoffzellen (PEMFCs), wobei der Schwerpunkt auf einer besseren PGM-Ausnutzung und einer verbesserten Haltbarkeit des Katalysators liegt. Die Arbeit gliedert sich in zwei Hauptaspekte: i) Optimierung der Katalysatorsynthese, einschließlich einer Seed-vermittelten Route für oktaedrische PtNi-Nanopartikel mit hoher Pt-Beladung sowie Rhodium- und Iridium-Dotierung, um die elektrochemische Oberfläche (ECSA), die ORR-Aktivität und die Stabilität zu erhöhen; und ii) systematische Bewertung der Schlüsselfaktoren, die die Übertragung einer hohen katalytischen Aktivität von Flüssigkeits-Halbzellenmessungen auf Membran-Elektroden-Anordnungen (MEA) beeinflussen. Detaillierte Studien zu Morphologie, Struktur, Zusammensetzung, ORR-Leistung und Haltbarkeit werden mit Techniken wie der rotierenden Scheibenelektrode (RDE), der schwimmenden Elektrode (FET) und der MEA durchgeführt. Fortgeschrittene in-situ und online Methoden wurden angewendet, um zeitaufgelöste und potenzialabhängige Analysen zur genaueren Untersuchung der Katalysatormechanismen durchzuführen. Zusammenfassend liefert diese Dissertation wertvolle Erkenntnisse für das Design robuster und effizienter Brennstoffzellenkatalysatoren für praktische Anwendungen."]},{"key":"dc:title","label":"Title","values":["Enhanced performance and durability of shape-controlled octahedral PtNiX catalysts for advanced fuel cell applications"]}]}],"canonical_facts":{"dc:contributor.advisor":["Strasser, Peter"],"dc:creator":["Pan, Lujin"],"dc:date.accessioned":["2025-04-15T13:39:17Z"],"dc:date.available":["2025-04-15T13:39:17Z"],"dc:date.issued":["2025"],"dc:description.abstract":["The rapid population growth and industrial development has intensified energy demand and climate issues, emphasizing the urgent need to shift from fossil fuels to more sustainable energy alternatives such as “green” hydrogen. Hydrogen fuel cell technologies are attractive as zero-emission solutions in transportation and other power sectors. However, the wider adoption of hydrogen fuel cells is bottlenecked by high costs associated with fuel cell stacks, more specifically of platinum group metal (PGM) catalysts, as well as insufficient performance and limited long-term durability. This thesis addresses the development, characterization, and performance evaluation of advanced octahedral Pt-based cathode ORR catalysts of proton exchange membrane fuel cells (PEMFCs), with a focus on better PGM utilization and enhanced catalyst durability. The work is structured of two primary aspects: i) optimization of catalyst synthesis, including a seed-mediated route for octahedral PtNi nanoparticles with high Pt loading, as well as rhodium and iridium doping to increase electrochemical surface area (ECSA), ORR activity, and stability; and ii) systematic evaluation of the key factors that influence the translation of high catalytic activity from liquid half-cell measurements to membrane electrode assembly (MEA) testing. Detailed studies on the morphology, structure, composition, and ORR performance and durability are conducted using techniques like rotating disk electrode (RDE), floating electrode technique (FET), and MEA. Advanced in situ and online methods were employed for time-resolved and potential-dependent analyses to further understand catalyst mechanisms. In summary, this thesis provides valuable insights into the design of robust and efficient fuel cell catalysts for practical applications.","Das rasche Bevölkerungswachstum und die industrielle Entwicklung haben die Energienachfrage und die Klimaproblematik verschärft, was die dringende Notwendigkeit unterstreicht, von fossilen Brennstoffen auf nachhaltigere Energiealternativen wie „grünen“ Wasserstoff umzusteigen. Die Wasserstoff-Brennstoffzellentechnologie zeichnet sich dadurch aus, dass sie im Verkehrswesen und in anderen Sektoren emissionsfreie Lösungen bietet. Die breitere Einführung von Wasserstoff-Brennstoffzellen wird jedoch durch die hohen Kosten der Platingruppenmetall-Katalysatoren (PGM) sowie durch die unzureichende Leistung und die begrenzte langfristige Haltbarkeit behindert. Diese Doktorarbeit befasst sich mit der Entwicklung, Charakterisierung und Leistungsbewertung fortschrittlicher oktaedrischer Pt-basierter Kathoden-ORR-Katalysatoren für Protonenaustauschmembran-Brennstoffzellen (PEMFCs), wobei der Schwerpunkt auf einer besseren PGM-Ausnutzung und einer verbesserten Haltbarkeit des Katalysators liegt. Die Arbeit gliedert sich in zwei Hauptaspekte: i) Optimierung der Katalysatorsynthese, einschließlich einer Seed-vermittelten Route für oktaedrische PtNi-Nanopartikel mit hoher Pt-Beladung sowie Rhodium- und Iridium-Dotierung, um die elektrochemische Oberfläche (ECSA), die ORR-Aktivität und die Stabilität zu erhöhen; und ii) systematische Bewertung der Schlüsselfaktoren, die die Übertragung einer hohen katalytischen Aktivität von Flüssigkeits-Halbzellenmessungen auf Membran-Elektroden-Anordnungen (MEA) beeinflussen. Detaillierte Studien zu Morphologie, Struktur, Zusammensetzung, ORR-Leistung und Haltbarkeit werden mit Techniken wie der rotierenden Scheibenelektrode (RDE), der schwimmenden Elektrode (FET) und der MEA durchgeführt. Fortgeschrittene in-situ und online Methoden wurden angewendet, um zeitaufgelöste und potenzialabhängige Analysen zur genaueren Untersuchung der Katalysatormechanismen durchzuführen. Zusammenfassend liefert diese Dissertation wertvolle Erkenntnisse für das Design robuster und effizienter Brennstoffzellenkatalysatoren für praktische Anwendungen."],"dc:identifier.uri":["https://depositonce.tu-berlin.de/handle/11303/24314","https://doi.org/10.14279/depositonce-23128"],"dc:language.iso":["en"],"dc:rights.uri":["http://rightsstatements.org/vocab/InC/1.0/"],"dc:title":["Enhanced performance and durability of shape-controlled octahedral PtNiX catalysts for advanced fuel cell applications"],"dc:type":["Doctoral Thesis"]},"updated_at":"2026-07-27T21:28:31Z"}