Blar i NTNU Open på forfatter "Wiik, Kjell"
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A comprehensive study on improved power materials for high-temperature thermoelectric generators
Bittner, Michael; Kanas, Nikola; Hinterding, Richard; Steinbach, Frank; Räthel, Jan; Schrade, Mattias; Wiik, Kjell; Einarsrud, Mari-Ann; Feldhoff, Armin (Journal article; Peer reviewed, 2019)Dense Ca3Co4O9-NaxCoO2-Bi2Ca2Co2O9 (CCO-NCO-BCCO) nanocomposites were produced from sol-gel derived Ca2.25Na0.3Bi0.35Tb0.1Co4O9 powder by four methods: Hot-pressing (HP), spark plasma sintering (SPS) and pressureless ... -
A Stability Study of Substoichiometric Silicon Nitride Nanoparticles as Active Anode Material for Li-ion Batteries
Krogsæter, Henrik (Master thesis, 2019)De fremragende elektrokjemiske egenskapene til understøkiometrisk silisium nitrid (SiNx) har gjort dette material til en potensiell kandidat for neste generasjons Li-ion batteri aktive anode materiale. Den først litsieringen ... -
A study on commercial SiC-powders sintered by hot pressing
Mogstad, Kent (Master thesis, 2016)Hot-pressing of a commercial silicon carbide powder was performed with 0, 5 and 10wt% added hexagonal boron nitride. Density, microstructural and compositional development has been studied ex situ with different holding ... -
Al-Doped LLZO Synthesized via Spray Pyrolysis of Carbon-Free Nitrate Precursors
Klokkehaug, Margrethe (Master thesis, 2023)Faststoff elektrolytter blir for tiden undersøkt for bruk i Li-ion batterier som en erstatning for de organiske væskebaserte elektrolyttene som brukes i dagens batterier. Dette vil forbedre batterisikkerheten, kjemisk og ... -
All oxide thermoelectric device based on Ca0.931Mn0.98Ta0.02O3-δ-Ca3Co4O9 pn-junction
Kolobekken, Sara Hizon (Master thesis, 2017)Metal oxides are promising thermoelectric (TE) material candidates for TE modules operational in a range of 300-1200 K in air. In this work a TE oxide module was fabricated by co-sintering the p-type material Ca3Co4O9 ... -
All-oxide thermoelectric module with in situ formed non-rectifying complex p-p-n junction and transverse thermoelectric effect
Kanas, Nikola; Bittner, Michael; Desissa, Temesgen Debelo; Singh, Sathya Prakash; Norby, Truls Eivind; Feldhoff, Armin; Grande, Tor; Wiik, Kjell; Einarsrud, Mari-Ann (Journal article; Peer reviewed, 2018)All-oxide thermoelectric modules for energy harvesting are attractive due to high temperature stability, low cost, and the potential to use non-scarce and non-toxic elements. Thermoelectric modules are mostly fabricated ... -
An experimental investigation of co-sintering of oxygen permeable asymmetric membranes with composition La0.2Sr0.8Fe0.8Ta0.2O3-*.
Bøen, Runar Holten (Master thesis, 2012)Asymmetric membranes of composition La0.2Sr0.8Fe0.8Ta0.2O3 were co-sintered from tape casted membranes and porous supports. The ceramic powders for dense and porous supports were obrained through coarsening and solid state ... -
Are MXenes Suitable as Cathode Material for Rechargeable Mg Batteries?
Kaland, Henning; Hadler-Jacobsen, Jacob; Fagerli, Frode Håskjold; Wagner, Nils Peter; Wang, Zhaohui; Selbach, Sverre Magnus; Vullum-Bruer, Fride; Wiik, Kjell; Schnell, Sondre Kvalvåg (Peer reviewed; Journal article, 2020)MXenes, a type of two-dimensional transition metal carbide/nitride, have received significant attention for electrochemical storage applications. With substantial capacities predicted for Mg ions, MXenes have been considered ... -
Aspects related to the thermal and mechanical stability of oxygen permeable membranes
Sahini, Mtabazi Geofrey (Doctoral theses at NTNU;2017:59, Doctoral thesis, 2017)Fossil fuels causes CO2 emission to the atmosphere after combustion, and to minimize CO2 emission carbon capture and sequestration (CCS) technologies are under development. CCS involves CO2 capture, compression, transport ... -
Bulk substitution of F-terminations from Ti3C2Tx MXene by cation pillaring and gas hydrolysation
Fagerli, Frode Håskjold; Vullum, Per Erik; Grande, Tor; Wang, Zhaohui; Selbach, Sverre Magnus; Wiik, Kjell; Wagner, Nils Peter (Journal article, 2023)Applications of 2D MXenes are limited by the difficulty of controlling bulk termination groups after the initial HF etching step without forming surface oxides. Here, we report on gas hydrolysation using a continuous flow ... -
Cation inter-diffusion and formation of intermediate phases in CoO and La2NiO4+d diffusion couples.
Sahini, Mtabazi Geofrey; Grande, Tor; Wiik, Kjell (Peer reviewed; Journal article, 2022)Cation interdiffusion between La2NiO4+δ (LN) and CoO diffusion couples was investigated by thermal annealing in ambient air at 1200 °C for 48 and 168 h, and analysis of the cross sections by scanning electron microscopy ... -
Chemical stability of Ca3Co4−xO9+δ/CaMnO3−δ p–n junction for oxide-based thermoelectric generators
Gunnæs, Anette Eleonora; Tofan, Raluca; Berland, Kristian; Gorantla, Sandeep Madhukar; Storaas, Thomas Aarflot; Desissa, Temesgen Debelo; Schrade, Matthias; Persson, Clas; Einarsrud, Mari-Ann; Wiik, Kjell; Norby, Truls Eivind; Kanas, Nikola (Peer reviewed; Journal article, 2020)An all-oxide thermoelectric generator for high-temperature operation depends on a low electrical resistance of the direct p–n junction. Ca3Co4−xO9+δ and CaMnO3−δ exhibit p-type and n-type electronic conductivity, respectively, ... -
Chemical tracer diffusion of Sr and Co in polycrystalline Ca-deficient CaMnO3-δ with CaMn2O4 precipitates
Desissa, Temesgen D.; Kanas, Nikola; Singh, Sathya Prakash; Wiik, Kjell; Einarsrud, Mari-Ann; Norby, Truls Eivind (Journal article; Peer reviewed, 2018)Diffusivity on the A- and B-site of polycrystalline perovskite CaMnO3-δ with Ca deficiency and spinel CaMn2O4 (marokite) as a secondary phase was studied using chemical tracers and secondary ion mass spectrometry (SIMS) ... -
Comparison of iron and copper doped manganese cobalt spinel oxides as protective coatings for solid oxide fuel cell interconnects
Talic, Belma; Molin, Sebastian; Wiik, Kjell; Hendriksen, Peter Vang; Lein, Hilde Lea (Journal article; Peer reviewed, 2017)MnCo2O4, MnCo1.7Cu0.3O4 and MnCo1.7Fe0.3O4 are investigated as coatings for corrosion protection of metallic interconnects in solid oxide fuel cell stacks. Electrophoretic deposition is used to deposit the coatings on ... -
Development and ceramic processing of all-oxide thermoelectric module with direct p-n junction
Kanas, Nikola (Doctoral theses at NTNU;2018:91, Doctoral thesis, 2018) -
Development of Asymmeteric Membranes for Oxygen Separation by Tape Casting and Dip Coating
Talic, Belma (Master thesis, 2013)Ceramic membranes made from mixed ionic and electronic conductive oxide materials have received much attention over the last decade due to their ability to separate oxygen from air at 100 % selectivity. The flux through ... -
Development of Composite Cathodes for Solid Oxide Fuel Cells
Angeltveit, Maria (Master thesis, 2017)Solid oxide fuel cells have the potential to become an important device for clean energy production. Today, these cells run at high temperatures, which causes degradation in the cell components and a short life-time of the ... -
Development of oxides with n-type electronic conductivity for applications in high temperature thermoelectric generators (TEGs)
Singh, Sathya Prakash (Doctoral theses at NTNU;2018:378, Doctoral thesis, 2018) -
Development of Thermoelectric n-type Oxides in the La-Sr-Ti-O-System
Sele, Jaran (Master thesis, 2013)Development of donor-doped thermoelectric (TE) perovskite oxides based on strontium titanate (STO) was investigated with respect to synthesis, phase stability, and TE properties. La was employed as an A-site donor-dopant ... -
Diffusion couple study of the interaction between Cr2O3 and MnCo2O4 doped with Fe and Cu
Talic, Belma; Hendriksen, Peter Vang; Wiik, Kjell; Lein, Hilde Lea (Peer reviewed; Journal article, 2019)Manganese cobalt spinel oxides are promising coating materials for the protection of ferritic stainless steel interconnects in solid oxide fuel cell (SOFC) stacks. The interaction between such coatings and the steel is ...