Disputation: Reshma Krishnan Madathil

Doctoral candidate Reshma Krishnan Madathil at the Department of Chemistry, Faculty of Mathematics and Natural Sciences, is defending the thesis Novel approaches and interface engineering for the fabrication and stability of thermoelectric components and modules for the degree of Philosophiae Doctor.

Image may contain: A dark haired woman with glasses and a bindi standing in front of a green background.

Reshma Krishnan Madathil. Photo credit: Private.

The Disputation will be live streamed for everyone else.
The livestream will be activated 15 minutes before the Defence starts.

Trial lecture

Desember, 10:15 AM, Auditorium 3, Chemistry building

Trial lecture title: The application of thermoelectric materials as heat flux sensors

The trial lecture will be live streamed for everyone else.
The livestream will be activated 15 minutes before the trial lecture starts.

Kreeringssammendrag/Conferral summary 

Termoelektriske materialer kan omdanne varmegradienter til elektrisk energi og omvendt. I dette prosjektet ble forskjellige sammenkoblinger mellom termoelektriske oksidkeramer undersøkt for å øke ytelse og levetid ved høye temperaturer. Dette kan brukes i termoelektriske generatorer for utnyttelse av spillvarme fra metallurgisk og kjemisk industri, kraftverk, etc., som vil øke systemeffektiviteten og kan minske klimagassutslipp. Studien har vært en del av en innovasjonsklynge for termoelektriske materialer ved Universitetet i Oslo og har gitt resultater som kan brukes til utvikling av nye måleinstrumenter, bedre materialer, og nye fabrikasjonsteknikker.

Main research findings

Sustainable energy harvesting systems such as wind turbines, solar cells, thermoelectric generators, and piezoelectric and electromagnetic devices have gained increased attention over the past few decades to address the energy and climate crises. Thermoelectric generators can transform thermal waste energy into electrical energy and thereby contribute increase system efficiencies of heat intensive processes and reduce emissions.

Traditional thermoelectric alloy materials have good performance, but tend to be toxic, scarce, and oxidizable in air, which limits their application for heat recovery from high temperature processes under ambient conditions. Metal oxides are alternative candidates for thermoelectrics tending to be of low costs, low toxicity, high abundance, and long-term stability at high temperatures, although lower power conversion efficiencies. The research in thermoelectric oxides has so far mainly focused on improving the material properties, while minimization of electrical contact resistance with non-noble-metal contacts is important, but not much considered.

In this project, the oxidation of an intermetallic thermoelectric material was characterised and parameterised. A sample holder for testing materials and interconnects in a 4-leg module at high temperatures was developed and commercialised. The feasibility of omitting the metal interconnect for oxide thermoelectric modules was investigated, by inherently coexistent oxide couples and using conducting oxides. The results give guidance to fabrication of simple, cheap, and stable oxide-based generators for high temperature applications.

Candidate contact information

 

Web adress: https://www.researchgate.net/profile/Reshma-Madathil

E-mail address: Reshma.madathil@smn.uio.no                     

Phone number: +91 9074743251

Published Nov. 1, 2022 12:12 PM - Last modified Nov. 25, 2022 11:43 AM