Håkon Andersen

• Andersen, Håkon; Xu, Kaiqi; Malyshkin, Dmitry; Strandbakke, Ragnar & Chatzitakis, Athanasios Eleftherios (2020). A highly efficient electrocatalyst based on double perovskite cobaltites with immense intrinsic catalytic activity for water oxidation. Chemical Communications. ISSN 1359-7345. 56(7), s. 1030–1033. doi: 10.1039/c9cc08765f.

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• Andersen, Håkon; Larring, Yngve & Haugsrud, Reidar (2024). Kinetic study of novel oxygen carriers for chemical looping for hydrogen production: Ca0.6La0.4Ti0.1CrxMn0.9-xO3-δ (x = 0.3, 0.45 & 0.6).
• Andersen, Håkon (2023). Fundamental studies of oxygen carrier materials: surface kinetics, thermodynamics, and transport properties.
• Andersen, Håkon; Larring, Yngve & Haugsrud, Reidar (2023). Particle size effects on pulse isotope exchange measurements.
• Strandbakke, Ragnar; Balaguer, María; Carrillo, Alfonso; Wachowski, Sebastian Lech; Mielewczyk-Gryń, Aleksandra & Szpunar, Iga [Vis alle 13 forfattere av denne artikkelen] (2021). Hydration and electrochemistry of mixed conducting cobaltites.
• Andersen, Håkon; Norby, Truls Eivind & Strandbakke, Ragnar (2020). Functional Properties and Electrochemical Performance of New Positrode Materials for Proton Ceramic Electrochemical Cells. Universitetet i Oslo. Vis sammendrag

  Proton Ceramic Electrochemical Cells (PCECs) exhibit high efficiency at lower temperatures due to the low activation energy ofproton transport. PCECs havealso obtained a great interest for its fuel utilisation, which result in a higher operating cell voltage and efficiency. However, the development of efficient commercial PCECs has been held back by the lack ofanefficient electrode at the oxygen steam side, also known as positrode.BaGd0.8La0.2Co2O6-δ (BGLC82) has shown to be a state of the art positrode, with Mixed Proton and Electronic Conductivity (MPEC). By using BGLC82 as a backbone in developing new and efficient electrode materials, the primary object of this thesis is to study the functional properties of selected doped BGLC82 materials, with their focus as positrodematerials for PCECs. BGLC82 was 10 % doped with the chosen materials zinc, titanium and zirconia (BaGd0.8La0.2Co1.8X0.2O6-δX=Zn, Ti, Zr). The BGLC82 compositionswere synthesised by solid-state reaction (SSR). BGLC82 Ti and Zn showed to obtain single phases, whereasBGLC82: Zr exhibit a secondary phase of BaZrO3. To try to obtain a single phase of BGLC82: Zr sol-gel (SG) synthesis was used. BGLC82: Zr still exhibited the same secondary phase obtained for SSR, but with a lower amount. This implies that the solubility of Zr in BGLC82 was exceeded.BGLC82 Ti and Zn were tested for proton uptake by Thermogravimetric Analysis (TGA)at 300 –500 °C. The measurementsshowed that BGLC82: Ti exhibitsa higher proton uptake than BGLC82, whereas BGLC82: Zn obtain lower proton uptake than BGLC82. This implies that the donor dopant stabilises the protonic defectsin the BGLC82 structure, dueto the basisety of the cation. For the experimental setup, small pellets of the BGLC82 composites were placed on top of a BaZr0.7Ce0.2Y0.1O3-δ(BZCY72) at the same time and held in place by a spring load. To obtain the best contact between the electrodes and the electrolyte, the surfaces in contact were polished. Platinumwas used as counter and reference electrode,placed on the opposite side of the BGLC82 composite electrodes.

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