Article
Materials Science, Ceramics
Furkan Toruntay, Gamze Atalmis, Cigdem Timurkutluk, Bora Timurkutluk
Summary: The study showed that with increasing ceramic filler content, the mechanical strength of the samples tends to decrease, but the thermal cycle behavior of samples with ceramic fibers is improved. Especially, for the sample with 4 ceramic fiber interlayers, the mechanical strength shows an increasing trend with the number of thermal cycles.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Cigdem Timurkutluk, Furkan Toruntay, Sezer Onbilgin, Gamze Atalmis, Bora Timurkutluk
Summary: This study investigates the effect of ceramic fibers with different sizes on the sealing performance of glass ceramic seals for microtubular solid oxide fuel cell applications. Experimental results show that sealing pastes with ceramic bulk fiber and ceramic fiber rope gasket can effectively improve the sealing performance, while pastes without filler and with ceramic blanket exhibit poor sealing performance.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Hisashi Nakane, Hiroyuki Shimada, Kunimasa Sagata, Yuki Yamaguchi
Summary: The research finds that ceramic sealing agents exhibit stable sealing properties in a wide temperature range for high-temperature solid oxide cells, with the characteristics of low-temperature curing and optimized thermal expansion coefficient, making them suitable candidates for SOC sealing materials.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Mengyuan Guo, Yiqian Jin, Ruijie Zhang, Zhibin Yang, Suping Peng
Summary: The study demonstrated that glass sealants containing Al2O3 have good gas tightness properties, making them suitable for SOFC stacks. Through analysis of the thermal performance and crystallization behavior of the glass sealing materials, a stable leakage rate can be maintained at high temperatures.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
Sea-Fue Wang, Yung-Fu Hsu, Yi-Le Liao, Yuan-Jie Yang, Piotr Jasinski
Summary: This study evaluates the properties of BaO-Al2O3-SiO2 (SAB) glasses incorporated with CaO and V2O5 as modifiers and additives. The addition of CaO decreases the electrical resistivities of the glasses, while increasing the V2O5 content increases the resistivities due to lower ionic mobility. The presence of V2O5 improves the wettability and fracture strength of the glasses on the substrate. The SAB glass with 20 wt% CaO and 2 wt% V2O5 exhibits excellent sealing properties and compatibility with high-temperature substrates, making it suitable for solid oxide fuel cell applications.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Materials Science, Ceramics
Mengyuan Guo, Zhibin Yang, Jinmei Liu, Yiqian Jin, Xu Wu, Fanglin Chen, Suping Peng
Summary: A feldspar-based glass sealant composed mainly of CaO-K2O-Na2O-BaO has been developed with stable performance and close to theoretical voltage values for solid oxide fuel cell sealing applications.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Paramvir Kaur, Trisha Walia, K. Singh
Summary: This study investigates the compatibility and performance of a mixture of SrZr0.85Cu0.15O3-delta (cathode) and a glass sealant as components for solid oxide fuel cells. The results show that the material mixture exhibits the required thermal expansion coefficient even after extended heat treatment.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Materials Science, Ceramics
Mengyuan Guo, Xiaoqiang Zhang, Ying Li, Martin Andersson, Zhibin Yang, Suping Peng
Summary: A low leakage rate sealant of 10 wt% ZrO2-added CaO-K2O-Na2O-BaO silicate glass for SOFC was studied. The sealant's structure remained stable at high temperatures with leakage rates below 10(-4) sccm.cm(-1), and no crystals, except for ZrO2, were found in XRD analysis after heating at 800 degrees C for 100 hours. ZrO2 was distributed in the glass matrix and played a role in preventing over-softening at operating temperature. SEM analysis at 750 degrees C for 100 hours confirmed good compatibility between the sealant and SUS430 interconnect in both oxidizing and reducing atmospheres.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
V. H. Rangel-Hernandez, Q. Fang, J. Malzbender, M. G. R. Sause, C. Babelot, S. M. Gross-Barsnick, L. Blum
Summary: The study applied the acoustic emission (AE) technique to monitor and characterize the failure process of glass-ceramic sealant under torsional shear strength, showing that AE energy and the average frequency of signals can provide insights into the degree of microscopic damage and fracture mechanisms.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Materials Science, Ceramics
Yan Zhao, Pengjun Zhao, Qing Zhao, Donglin He, Wenwen Kong, Bing Wu, Aimin Chang
Summary: This study investigates the potential of Mg-Al-Si-Ba-O-based glass ceramics as protective coatings for Mn-Co-Ni-O-based NTC thermistors at high temperatures. The glass ceramics were prepared with different compositions and characterized. The results show that the glass ceramic coatings effectively maintain the NTC properties of the sensitive ceramics and exhibit good performance in the thermal shock test.
CERAMICS INTERNATIONAL
(2022)
Article
Polymer Science
Mariana Domnica Stanciu, Horatiu Teodorescu Draghicescu, Ioan Calin Rosca
Summary: The study compared the mechanical properties of two different types of glass fiber-reinforced polyester composite materials (GFRP-RT500 and GFRP-MAT450), revealing differences in elastic modulus, ultimate tensile stress, and performance under cyclic loading.
Article
Chemistry, Physical
S. Bremm, S. Dolling, W. Becker, L. Blum, Ro Peters, J. Malzbender, D. Stolten
Summary: Solid oxide fuel cells provide electrical energy through a highly efficient direct transformation of chemical energy stored in fuels, and understanding the sealing loading conditions and failure assessment is crucial for current and future SOFC designs. The investigation of glass ceramics sealing failure in the present study reveals the complex nature of sealing failure mechanisms and the importance of material properties in different operating temperatures.
JOURNAL OF POWER SOURCES
(2021)
Article
Materials Science, Ceramics
Zhiquan Wang, Chun Li, Jian Cao, Ilaria Ritucci, Peyman Khajavi, Ragnar Kiebach
Summary: In this study, Ag-SiO2 was successfully used to join Ce/Co-coated AISI 441 stainless steels to Solid Oxide Cells. The influence of the braze composition and brazing temperature on the microstructure and mechanical properties of the joints was studied. Enhanced interfacial adherence was achieved through the reaction of SiO2 in the braze and the Co coating of the steel. The obtained joints possess excellent mechanical robustness and gas tightness compared to existing brazing systems.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
M. Fakouri Hasanabadi, J. Malzbender, S. M. Gross-Barsnick, H. Abdoli, A. H. Kokabi, M. A. Faghihi-Sani
Summary: This study investigated the mechanical properties of a sealant material using indentation testing, including elastic modulus, hardness, and fracture toughness. Heat treatment did not significantly alter the mechanical properties, and potential self-healing behavior of the sealant was observed.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Yaoyi Chen, Yanguo Yang, Yue Leng, Yunxiang Si, Fancheng Meng, Haishen Ren, Huixing Lin
Summary: The study systematically investigates and analyzes the inhibiting mechanism of MgO on the phase precipitation and phase transformation of BaAl2Si2O8 in MgO-BaO-CaO-Al2O3-B2O3-SiO2 glass-ceramic. The molecular dynamics simulation results show that the addition of MgO induces structural transformations in the glass, resulting in the replacement of BaAl2Si2O8 phase with other phases such as MgSiO3, Mg2SiO4, BaMgSiO4, Ba2MgSi2O7 and BaCa2Mg(SiO4)2. This implies that Mg ions have a higher reactivity towards silicate structure compared to Al and Ba ions.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Materials Science, Ceramics
Cigdem Timurkutluk, Furkan Toruntay, Sezer Onbilgin, Gamze Atalmis, Bora Timurkutluk
Summary: This study investigates the effect of ceramic fibers with different sizes on the sealing performance of glass ceramic seals for microtubular solid oxide fuel cell applications. Experimental results show that sealing pastes with ceramic bulk fiber and ceramic fiber rope gasket can effectively improve the sealing performance, while pastes without filler and with ceramic blanket exhibit poor sealing performance.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Furkan Toruntay, Gamze Atalmis, Cigdem Timurkutluk, Bora Timurkutluk
Summary: The study showed that with increasing ceramic filler content, the mechanical strength of the samples tends to decrease, but the thermal cycle behavior of samples with ceramic fibers is improved. Especially, for the sample with 4 ceramic fiber interlayers, the mechanical strength shows an increasing trend with the number of thermal cycles.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Sezer Onbilgin, Cigdem Timurkutluk, Bora Timurkutluk, Selahattin Celik
Summary: This study experimentally investigates the effect of contact pressure on the performance of electrolyte supported planar solid oxide fuel cells (SOFCs) by varying the pressure applied on the push rod. The results show that there is no linear relationship between the active area and the applied external pressure, and that adjusting the external load according to the cell size is necessary to achieve similar power densities.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Tolga Altan, Cigdem Timurkutluk, Bora Timurkutluk, Selahattin Celik
Summary: A new production technique combining tape casting and isostatic pressing is proposed for fabricating microtubular supports for solid oxide fuel cells. The results show that the supports fabricated using this method have good microstructural and mechanical properties, as well as reasonable electrochemical performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Tolga Altan, Selahattin Celik, Serkan Toros, Habip Gokay Korkmaz, Bora Timurkutluk
Summary: The redox cycles of Ni-based anodes in solid oxide fuel cells (SOFCs) have a direct impact on cell performance by breaking anode three/triple phase boundary networks at the microscale. These microcracks accumulate with the number of cycles, causing mechanical damage and threatening the service life of SOFC systems. This study proposes a microscale approach to investigate the redox process of Ni-based SOFC anodes, characterizing the anodes and determining the composition with the highest redox tolerance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Cigdem Timurkutluk, Recep Zan, Bora Timurkutluk, Furkan Toruntay, Sezer Onbilgin, Onur Hasret, Ali Altuntepe
Summary: Solid oxide fuel cells (SOFCs) are efficient electrochemical devices that convert the chemical energy of a fuel directly into heat and electrical energy. The electrochemical performance of SOFCs is greatly affected by the materials and microstructure of the electrodes, particularly at the triple phase boundaries (TPBs) within the electrodes. This study investigates the addition of reduced graphene oxide (rGO) to the cathode functional layer (CFL) to improve cell performance by utilizing the high electrical properties of graphene. Experimental results show a significant increase in peak performance for cells coated with a single layer of CFL containing 1 wt % graphene and sintered at 1050 degrees C, compared to the reference cell.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Cigdem Timurkutluk, Fuat Yildirim, Furkan Toruntay, Sezer Onbilgin, Mikail Yagiz, Bora Timurkutluk
Summary: Anode supported microtubular solid oxide fuel cells with LSM catalyst infiltrated LSM-YSZ cathodes are developed to increase triple phase boundary density in the cathode and improve cell performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Cigdem Timurkutluk
Summary: This paper proposes a novel method for manufacturing functionally graded anode supports for microtubular solid oxide fuel cells using tape casting and isostatic pressing. By tape casting, six different anode support strips with various pore former contents are produced. Furthermore, three-layered anode supports composed of different combinations of these tapes are fabricated by isostatic pressing. The results show that both homogeneous and porosity graded anode supports can be successfully manufactured by this method. Moreover, the cell with a porosity graded anode support achieves the highest maximum performance of 0.645 Wcm(-2) at 800 degrees C under 0.3 NLmin(-1) hydrogen and stationary air.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Materials Science, Ceramics
Fuat Yildirim, Cigdem Timurkutluk, Bora Timurkutluk
Summary: This study focuses on the development and optimization of nanostructured anode electrodes for solid oxide fuel cells (SOFCs) by infiltration method. The effects of catalyst loading and infiltration sintering temperature are investigated. The results show that nickel catalyst infiltration is a very effective method to improve the cell performance by providing increased number of electrochemical reaction zones within the anode electrode due to nanostructured nickel catalyst formed around the main YSZ phase.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Tolga Altan, Cigdem Timurkutluk, Sezer Onbilgin, Bora Timurkutluk
Summary: This study presents a new solid oxide fuel cell structure called bolt-microtubular. The anode supports of this structure are formed by winding tape cast anode support strip on a threaded rod and then isostatically pressing. The results show that the bolt-microtubular cells outperform conventional microtubular cells due to the enhanced electrolyte-electrode interfaces and effective current collection. The highest peak electrochemical performance of 0.293 Wcm(-2) is achieved with the bolt-microtubular cell, indicating the promising potential of this design.
JOURNAL OF POWER SOURCES
(2023)
Article
Chemistry, Physical
Gamze Atalmis, Serkan Toros, Bora Timurkutluk, Yuksel Kaplan
Summary: The storage of hydrogen in metal hydride reactors is examined experimentally and numerically, and the thermal properties and temperature distribution in the reactor are improved by coating the storage material with copper. The charging time is also reduced.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Energy & Fuels
Bora Timurkutluk, Yelda Ciflik, Guray Sonugur, Tolga Altan, Omer Genc
Summary: By investigating the role of microstructural properties on high-performance electrodes, artificial neural networks are used to quantitatively study the density of active triple phase boundaries (TPBs), and the effect of microstructural properties on active TPB density is discussed. The results show that reducing particle size increases active TPBs, and volume fractions of phases should be selected based on particle size.
