Amir Masoud Dayaghi

• Quina, Imanol; Almar, Laura; Catalán-Martínez, David; Dayaghi, Amir Masoud; Martínez, Agustin & Norby, Truls [Show all 8 contributors for this article] (2023). Direct electrocatalytic CO<inf>2</inf> reduction in a pressurized tubular protonic membrane reactor. Chem Catalysis. ISSN 2667-1093. 3(10). doi: 10.1016/j.checat.2023.100766.
• Dayaghi, Amir Masoud; Polfus, Jonathan M.; Strandbakke, Ragnar; Pokle, Anuj; Almar, Laura & Escolastico, Sonia [Show all 10 contributors for this article] (2023). Effects of sintering additives on defect chemistry and hydration of BaZr0.4Ce0.4(Y,Yb)0.2O3−δ proton conducting electrolytes. Solid State Ionics. ISSN 0167-2738. 401. doi: 10.1016/j.ssi.2023.116355.
• Luo, Yadan; Li, Ying; Huang, Wenlong; Dayaghi, Amir Masoud; Zhou, Gaopeng & Ding, Yushi [Show all 8 contributors for this article] (2023). Chemical stability and electrical properties of Ba1−xCaxCe0.8Gd0.2O3−δ (0 ≤ x ≤ 0.06) proton conductor. International Journal of Hydrogen Energy. ISSN 0360-3199. 48(15), p. 5656–5667. doi: 10.1016/j.ijhydene.2022.11.072.
• Sata, Noriko; Han, Feng; Zheng, Haoyu; Dayaghi, Amir Masoud; Norby, Truls & Stange, Marit Synnøve Sæverud [Show all 8 contributors for this article] (2021). Development of Proton Conducting Ceramic Cells in Metal Supported Architecture . ECS Transactions. ISSN 1938-5862. 103(1), p. 1779–1789. doi: 10.1149/10301.1779ecst. Show summary

  Metal-Supported (MS) architecture offers various advantages over state-of-the-art ceramic supported SOCs, such as high tolerance towards thermal/redox cycling that are key features for flexible and reliable operation in high temperature fuel cell and electrolysis applications. Our target is to develop Proton-conducting Ceramic Cells (PCC) in MS architecture, of which combination can provide potentially high performances, mechanical stability, and flexibility for wide range of electrochemical applications. The key challenge in the development of MS-PCC is to find a feasible process to fabricate gas-tight electrolyte on the porous metal substrate without degrading the metal support and the electrolyte. Our strategy is implementing multilayers combining wet chemical processes below 1000°C for the functional electrode and dry Physical Vapor Deposition (PVD) techniques below 800°C for the gas-tight electrolyte coating. In this paper, we present our recent results in the development of MS-PCC half cells. The materials selection for MS and PCC components, functional layer processing, and electrolyte layer deposition techniques are discussed.

• Dayaghi, Amir Masoud; Haugsrud, Reidar; Stange, Marit Synnøve Sæverud; Larring, Yngve; Strandbakke, Ragnar & Norby, Truls Eivind (2021). Increasing the thermal expansion of proton conducting Y-doped BaZrO3 by Sr and Ce substitution. Solid State Ionics. ISSN 0167-2738. 359. doi: 10.1016/j.ssi.2020.115534. Full text in Research Archive Show summary

  Proton conducting oxide electrolytes find potential application in proton ceramic fuel cells and electrolyzers operating at intermediate temperatures, e.g. 400–600 °C. However, state-of-the-art proton conducting ceramics based on Y-doped BaZrO3 (BZY) have lower thermal expansion coefficient (TEC) than most commonly applied or conceived supporting electrode structures, making the assembly vulnerable to degradation due to cracks or spallation. We have increased the TEC of 20 mol% Y-doped BZY (BZY20) by partially substituting Ba and Zr with Sr and Ce, respectively, to levels which still maintain the cubic structure and sufficiently minor n-type conduction; (Ba0.85Sr0.15)(Zr0.7Ce0.1Y0.2)O2.9 (BSZCY151020). High temperature XRD shows that this material has a cubic structure (space group ) in the temperature range of 25–1150 °C and a linear TEC of ~10 × 10−6 K−1, as compared to the ~8 × 10−6 K−1 for BZY. It exhibited a DC conductivity of ~5 mS cm−1 at 600 °C in wet H2. This electrolyte with increased TEC may find application in proton ceramic electrochemical cells in general and metal supported ones in particular.

• Han, Feng; Zhou, Xingping; Dayaghi, Amir Masoud; Norby, Truls Eivind; Stange, Marit Synnøve Sæverud & Sata, Noriko [Show all 7 contributors for this article] (2019). Development of Metal Supported Cells Using BaZrO3-Based Proton Conducting Ceramics . ECS Transactions. ISSN 1938-5862. 91(1), p. 1035–1045. doi: 10.1149/09101.1035ecst.
• Stange, Marit Synnøve Sæverud; Dayaghi, Amir Masoud; Denonville, Christelle; Larring, Yngve; Rørvik, Per Martin & Haugsrud, Reidar [Show all 7 contributors for this article] (2019). Fabrication of metal-supported proton-conducting electrolysers with thin film Sr- And Ce-doped BZY electrolyte. ECS Transactions. ISSN 1938-5862. 91(1), p. 941–949. doi: 10.1149/09101.0941ecst. Show summary

  n this work, we present fabrication and initial testing of metal-supported proton ceramic electrolyser (MS-PCEC) single cells with a thin electrolyte. Plansee ITM porous metal is used as metal support. Spray-coating is used to deposit a conducting layer of La1-xSrxTi1-yNiyO3-δ (LSTN) which is used for low temperature (600-800 °C) deposition of a gas-tight, thin-film layer (~2 μm) of electrolyte by pulsed laser deposition (PLD). Post-annealing of the electrolyte is evaluated to improve its performance. In order to have a smaller thermal expansion coefficient (TEC) mismatch towards LSTN (~10-11 × 10-6 K-1), we developed a new Sr- and Ce-doped proton-conducting electrolyte, yielding a larger TEC (~10-11 × 10-6 K-1) compared to BZY (~8 × 10-6 K-1). The cell with Pt as air electrode shows acceptable open circuit voltage and low overpotentials at 600 °C, demonstrating the potential of developing the first working MS-PCEC.

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• Stefan, Elena; Fontaine, Marie-Laure; Dayaghi, Amir Masoud; Vigen, Camilla Kaori; Vøllestad, Einar & Almar, Laura [Show all 11 contributors for this article] (2023). Ceramic membrane reactors for the electrocatalytic conversion of CO2 into chemical energy carriers .
• Stange, Marit Synnøve Sæverud; Denonville, Christelle; Stefan, Elena; Dayaghi, Amir Masoud; Larring, Yngve & Rørvik, Per Martin [Show all 9 contributors for this article] (2022). Fabrication and testing of thin-film based metal-supported proton ceramic electrochemical cells.
• Talic, Belma; Dayaghi, Amir Masoud; Vøllestad, Einar; Stefan, Elena; Sunding, Martin Fleissner & Polfus, Jonathan (2022). Chemical Stability of Proton Conducting BaZr1-xCexO3-Based Electrolytes in Pressurized CO2-Containing Atmospheres. Show summary

  Acceptor doped barium cerates and zirconates are attractive electrolyte materials for use in various proton ceramic electrochemical devices such as fuel cells and hydrogen pumps. However, the long-term durability of these materials may be challenged by poor chemical stability in CO2-containing atmospheres. In this work, the chemical stability of the electrolyte material BaZr0.8Ce0.1Y0.1O3 (BZCY81) is studied in CO2 and CO2-H2. Dense pellets prepared by sintering with NiO as a sintering aid were exposed to up to 10 bar CO2(-H2) for up to 150 h at elevated temperatures (400-800°C). After exposure, the pellet surface was analyzed by grazing incidence X-ray diffraction (XRD), scanning electrode microscopy (SEM), and X-ray photoelectron spectroscopy (XPS) to search for BaCO3 formation. Overall, the electrolyte material displayed excellent stability towards CO2. A small increase in apparent BaCO3 concentration on the pellet surface was only detected by XPS for samples aged in CO2 and CO2-H2 at 800 °C. However, BaCO3 was not visible by XRD and SEM-EDS, indicating that the reactivity is limited to a nm-thick region of the electrolyte surface. The impact of processing conditions such as sintering temperature and use of NiO sintering aid on the electrolyte stability will be discussed.

• Dayaghi, Amir Masoud; Polfus, Jonathan; Strandbakke, Ragnar; Vøllestad, Einar; Haugsrud, Reidar & Norby, Truls (2022). Effects of NiO, ZnO and CuO sintering additives on the hydration of BaZr0.4Ce0.4(Y,Yb)0.2O3-δ proton conducting electrolytes.
• Stange, Marit Synnøve Sæverud; Stefan, Elena; Dayaghi, Amir Masoud; Denonville, Christelle; Larring, Yngve & Rørvik, Per Martin [Show all 8 contributors for this article] (2021). Pulsed Laser Deposition of Electrolytes for Metal-Supported Proton-Conducting Electrolysis Cells.
• Stefan, Elena; Fontaine, Marie-Laure; Dayaghi, Amir Masoud; Vigen, Camilla Kaori; Vøllestad, Einar & Almar, Laura [Show all 11 contributors for this article] (2021). Development of protonic membrane reactors for the electrocatalytic conversion of CO2 into chemical energy carriers .
• Norby, Truls; Dayaghi, Amir Masoud; Storhaug, Sjur; Chen, Henry; Haugsrud, Reidar & Stange, Marit Synnøve Sæverud [Show all 9 contributors for this article] (2021). BSZCY151020: A proton ceramic electrolyte with increased TEC for planar applications .
• Stange, Marit Synnøve Sæverud; Stefan, Elena; Denonville, Christelle; Dayaghi, Amir Masoud; Larring, Yngve & Rørvik, Per Martin [Show all 11 contributors for this article] (2021). Processing route for Metal Supported Proton Conducting Ceramic Cells.
• sata, noriko; han, feng; costa, remi; Zhou, Xingping; Stange, Marit Synnøve Sæverud & Dayaghi, Amir Masoud [Show all 7 contributors for this article] (2019). Development of Metal Supported Cells Using BaZrO3-Based Proton Conducting Ceramics.
• Stange, Marit Synnøve Sæverud; Dayaghi, Amir Masoud; Denonville, Christelle; Larring, Yngve; Rørvik, Per Martin & Haugsrud, Reidar [Show all 7 contributors for this article] (2019). Fabrication of Metal-Supported Proton-Conducting Electrolysers with Thin Film Sr- and Ce-Doped BZY Electrolyte.
• Dayaghi, Amir Masoud; Stange, Marit Synnøve Sæverud; Denonville, Christelle; Larring, Yngve; Rørvik, Per Martin & Haugsrud, Reidar [Show all 7 contributors for this article] (2019). Thin-film electrolyte with TEC optimized for metal-supported proton ceramic electrochemical cell.
• Stange, Marit Synnøve Sæverud; Dayaghi, Amir Masoud; Denonville, Christelle; Larring, Yngve; Rørvik, Per Martin & Haugsrud, Reidar [Show all 7 contributors for this article] (2019). Key challenges in fabrication of metal-supported thin film proton conducting electrolyser cells.
• Dayaghi, Amir Masoud; Stange, Marit Synnøve Sæverud; Denonville, Christelle; Larring, Yngve; Rørvik, Per Martin & Norby, Truls Eivind (2018). Key challenges in fabrication of metal-supported proton conducting electrolyser cells .
• Stange, Marit Synnøve Sæverud; Dayaghi, Amir Masoud; Denonville, Christelle; Rørvik, Per Martin; Larring, Yngve & Norby, Truls Eivind (2018). Fabrication of Metal Supported Protonic Ceramic Electrolyser Cells (PCEC).
• Chen, Henry; Norby, Truls; Haugsrud, Reidar & Dayaghi, Amir Masoud (2022). Sintering Behavior and Conductivity of (Ba0.85Sr0.15)(Zr0.7Ce0.1Y0.2)O3-δ Doped with ZnO as Sintering Aid. Universitetet i Oslo.

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