The Disputation will be live streamed for everyone else.
The livestream will be activated 15 minutes before the Defense starts.
Trial lecture
October 24th, 10:15 AM, Auditorium 4, Chemistry building
Trial lecture title:
"The application of neutron scattering techniques to characterize hydrogen (both protons and hydride ions) in oxides"
Kreeringssammendrag/Conferral summary
Dette doktorgradsarbeidet undersøker holdbarheten og ytelsen til protonkeramiske elektrokjemiske reaktorer (PCER) under dynamisk drift. Forskningen identifiserte nøkkelfaktorer som påvirker effektiviteten og langtidsstabiliteten til PCER, inkludert ytelsesbegrensninger på grunn av gassdiffusjon og nedbrytning relatert til protonmigrasjon.
Main research findings
Hydrogen is becoming a crucial energy source, especially for reducing carbon emissions in transportation and industry. However, traditional methods of producing hydrogen are often inefficient and harmful to the environment. This thesis explores a new technology called Proton Ceramic Electrochemical Reactors (PCERs). The findings show that while PCERs are generally stable, certain conditions can lead to degradation, particularly at high temperatures. However, with careful management, these reactors could play a significant role in a cleaner and more efficient way to produce hydrogen.
The research focuses on understanding how these reactors perform under different conditions, including long-term use and varying power levels. Changing power levels revealed distinct performance regions, showing that high current densities limit cell performance due to gas diffusivity issues and other factors. Long-term stability tests identified significant degradation primarily due to proton migration, with heating cycles having a greater impact than operation duration.
Overall, this thesis provides valuable insights into improving PCER technology, paving the way for its future use in a hydrogen-powered world.
Candidate contact information
LinkedIn: www.linkedin.com/in/ireneyustir
E-post: iyuste@coorstek.com
Tel.: +47 93949953
Adjudication committee
Professor Ryan O'Hayre
Colorado School of Mines, USA
Professor Wolff-Ragnar Kiebach
DTU, Denmark
Professor Unni Olsbye
Department of Chemistry, University of Oslo, Norway
Supervisors
Professor Truls Norby
Department of Chemistry, University of Oslo, Norway
CTO Christian Kjølseth
CoorsTek Membrane Sciences AS, Norway
Professor Jose Manuel Serra Alfaro
Instituto de Technologia Quimica, Valencia Polythechnic Univeristy, Spain
Chair of defence
Professor Harald Walderhaug
Department of Chemistry, University of Oslo, Norway