Review
Chemistry, Multidisciplinary
Jie Gu, Lulu Jiang, Sara Adeeba Ismail, Hui Guo, Donglin Han
Summary: This review summarizes recent progress on the mechanism, materials, influential factors, and characterization methods of surface protonic conduction on oxide ceramics, and discusses its promising application in low temperature catalysis and solid-state electrochemical devices.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Qaisar Khushi Muhammad, Michael Scherer, Alexander Karl Opitz, Stefanie Taibl, Christin Boehme, Marcus Rohnke, Juergen Janek, Shuang Gao, Juergen Fleig, Till Froemling
Summary: This study investigates the influence of mechanically induced dislocations on the electrical conductivity and oxygen transport in YSZ. Distinctly aligned regions with abundant and deficient dislocations are generated using advanced mechanical deformation methods. Electrical characterization reveals highly conducting effects of dislocation-induced strain within the material. Targeted oxygen tracer diffusion experiments confirm the enrichment of oxygen incorporation within the dislocation bundles. Therefore, mechanically induced dislocations have the potential to serve as a design element for tuning bulk ionic transport in YSZ.
Article
Materials Science, Ceramics
Qiannan Li, Xiandong Hao, Yuxi Gui, Hongju Qiu, Yeqing Ling, Hewen Zheng, Mamdouh Omran, Lei Gao, Jin Chen, Guo Chen
Summary: In this study, 3 mol% yttria-doped tetragonal zirconia polycrystal material was prepared using optimised pressureless sintering process and the effect of sintering temperature on the properties of the material was analysed. The results showed that sintering promoted the transformation of the monoclinic phase into the tetragonal phase, leading to improved crystallinity of the sample. Zirconia material sintered at 1000 degrees C demonstrated the lowest porosity and highest density among the studied temperatures.
CERAMICS INTERNATIONAL
(2021)
Article
Nanoscience & Nanotechnology
Sangbong Ryu, In Won Choi, Yang Jae Kim, Sanghoon Lee, Wonyeop Jeong, Wonjong Yu, Gu Young Cho, Suk Won Cha
Summary: In order to improve the sluggish oxygen-ion conduction in the electrolytes of low-temperature solid-oxide fuel cells (SOFCs), researchers have focused on fabricating thin-film electrolytes. This study used reactive sputtering to deposit yttria-stabilized zirconia (YSZ) as a thin-film electrolyte. By varying the sputtering chamber pressure, the researchers were able to achieve high surface area, large grain size, and residual tensile stress, resulting in improved electrolyte performance. The thin-film SOFC with YSZ deposited at 15 mTorr exhibited the highest maximum power density at low operating temperature. Evaluation: 8 out of 10.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Ceramics
M. Morales, S. Garcia-Gonzalez, J. Rieux, E. Jimenez-Pique
Summary: An effective strategy to reduce cathode polarization in a SOFC is to enlarge the cathode-electrolyte interface by corrugating the surface of the electrolyte, and this study analyzes the microstructural and phase changes as well as collateral damage caused by laser machining of the 8YSZ electrolyte surface. The results show the presence of a limited heat affected zone with microcracking and directional recrystallization, larger in 8YSZ than in 3Y-TZP, but no significant changes in the mechanical response and chemical composition of the machined surface.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
M. Yarahmadi, J. J. Roa, J. Zhang, L. Cabezas, L. Ortiz-Membrado, L. Llanes, G. Fargas
Summary: This study investigates the micromechanical properties of yttria-doped zirconia ceramics produced by Direct-Ink Writing (DIW) and Cold Isostatic Pressing (CIP). The results show that DIW samples have 20-25% lower hardness values compared to the corresponding CIP samples due to microstructural defects like porosity. However, at the local level, the hardness and elastic modulus achieved by nanoindentation are closer between printed and CIP samples.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Ammar Eqbal, Tamoghna Chakrabarti
Summary: Flash Sintering has the potential to significantly reduce sintering time and temperature. However, the presence of hotspots and electrochemical effects lead to heterogeneity in densification and microstructure in flash-sintered samples. By adding ZnO dopant (0.75-3 mol%) during flash sintering of 3YSZ, the extent of electrochemical reaction can be varied. Increasing the dopant concentration results in a substantial increase in grain size. Adding 0.75 mol% ZnO dopant significantly improves densification and reduces the presence of cracks, while also increasing electrochemical blackening.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Siyao Li, Shoulei Xu, Xiangyu Wang, Daini Wang, Bernard A. Goodman, Xing Hong, Wen Deng
Summary: Cubic zirconia single crystals stabilized with yttria and doped with Gd2O3 were prepared and characterized using various spectroscopic techniques. The absorption and emission spectra showed distinct peaks, with peak intensities changing with varying Gd3+ concentrations. The quenching effect observed in the emission spectra is attributed to dipole-dipole interactions, and supported by the broadening of Gd3+ EPR spectra with increasing concentration.
CERAMICS INTERNATIONAL
(2021)
Article
Nanoscience & Nanotechnology
Mohammad Nisar, Yecheng Ma, Shahid Khan, Rabia Khatoon, Gang Xu, Yong Liu, Gaorong Han
Summary: Based on density functional calculations, the impact of Fe (III) doping on BaZrO3 was explored, revealing a transition from a semiconducting cubic phase to a conducting tetragonal phase when Fe content exceeded 12.5%. Correct predictions of half-metallicity in BaFexZr1-xO3 were observed at doping concentrations of 12.5% and 25%.
Article
Chemistry, Multidisciplinary
Sang Eun Lee, Sung Yeb Jung, Jun Seo, Jong Hoon Joo, Jaekwang Lee, Young-Min Kim, Kyu Hyoung Lee, Yong In Kim, Hee Jung Park
Summary: The study developed a 2D titanium-oxide film with high protonic conductivity, demonstrating its electrical properties under different temperatures and environments. The film exhibits protonic conduction dominance at low temperatures and electronic conduction dominance at high temperatures, with significantly higher conductivity compared to conventional 3D titanium-oxide.
ADVANCED MATERIALS INTERFACES
(2021)
Article
Chemistry, Physical
Muhammad Naeem Iqbal, Zhijian James Shen, Tore Bengtsson, Mirva Eriksson
Summary: The biocompatibility of yttria (3 mol%) stabilized zirconia ceramics, 3Y-TZP, is significantly affected by protein adsorption from human saliva, which depends on the material's surface properties. Variations in nano-roughness levels of 3Y-TZP discs were tested for their specificity and selectivity towards size and uptake of human salivary protein.
Article
Engineering, Multidisciplinary
Tomohiro Harai, Masayoshi Mizutani, Shunichi Shishido, Keisuke Nakamura, Hitoshi Ohmori, Toyohiko J. Konno, Tsunemoto Kuriyagawa
Summary: Low-temperature degradation (LTD) is a problem for the integrity of zirconia implants. This study investigated the LTD properties of zirconia with surface treatment using nanosecond and picosecond pulsed lasers. The results showed that laser treatments deteriorated the LTD resistance of the materials and additional annealing hindered LTD propagation.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Sudeshna Madhual, P. Padma Kumar
Summary: Yttria-doped ceria is a promising solid electrolyte for solid oxide fuel cells, and its oxygen ion conductivity shows a maximum at 14 mol% yttrium doping and decreases afterward. This variation is related to the non-monotonic residence time of oxygen ions at their tetrahedral locations in the fluorite lattice. Additionally, the presence of yttrium influences the energy barriers for ion hops along different channels, which explains the observed conductivity variation.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Materials Science, Ceramics
Samuel Margueron, Ausrine Bartasyte
Summary: This study investigates the high temperature phase of t'-YSZ thermal barrier coatings using ultraviolet Raman scattering and finds that the strong Raman scattering intensity of t'YSZ may originate from the photoelasticity effect of the ferroelastic phase.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Chemistry, Inorganic & Nuclear
Ya-Zhe Xing, Yin-Ni Men, Xiao Feng, Ji-Hua Geng, Zhi-Rui Zou, Fu-Hua Chen
Summary: The effect of CuO addition on the microstructure and ionic conductivity of 8YSZ was investigated. The results show that with increasing CuO doping content, the lattice parameter decreases, while the relative density and mean grain size increase. 2 mol% CuO-doped 8YSZ exhibits the lowest activation energy and the highest ionic conductivity.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Electrochemistry
Yuta Kimura, Keita Funayama, Mahunnop Fakkao, Takashi Nakamura, Naoaki Kuwata, Tatsuya Kawada, Junichi Kawamura, Koji Amezawa
Summary: The experimental results show that the mu(Li) in two-phase electrode materials immediately changes after loading and then gradually changes while maintaining a constant mechanical load. Loading and unloading lead to mu(Li) variations in the opposite direction. This characteristic mu(Li) variations can be explained by considering the change in the phase equilibrium between the two phases.
Article
Multidisciplinary Sciences
Kota Motohashi, Yosuke Matsukawa, Takashi Nakamura, Yuta Kimura, Naoaki Kuwata, Yoshiharu Uchimoto, Koji Amezawa
Summary: This study proposes a new material design for fast anion conductors, using flexible molecular cation as a host cation. It demonstrates successful fluoride ion conduction in NH4MgF3 and (NH4)2MgF4 based materials. The findings suggest the potential of molecular cation-containing compounds as attractive material groups for fast anion conductors.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Physical
Shogo Miyoshi, Yoshihiko Nishihara, Kazunori Takada
Summary: This study investigates the influence of cobalt introduction on the sintering behavior and phase equilibrium of LATP. It is found that a slight cobalt doping can improve the sinterability of LATP and form a stable second phase LiPO3. Under specific cobalt content conditions, the relative density of sintered LATP can reach 100%.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Naoya Masuda, Kiyoshi Kobayashi, Futoshi Utsuno, Tetsuo Uchikoshi, Naoaki Kuwata
Summary: This article discusses the application of argyrodite materials containing phosphorus sulfides in all-solid-state lithium-ion batteries, presents a new model for ion-conducting path, and introduces materials with higher ionic conductivity.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Naoaki Kuwata, Yasutaka Matsuda, Tatsunori Okawa, Gen Hasegawa, Osamu Kamishima, Junichi Kawamura
Summary: In this study, in situ Raman spectroscopy was used to investigate the structural changes of LixMn2O4 in thin-film batteries. The results show that the Raman intensity of LixMn2O4 exhibits hysteresis during charging and discharging when observed from the front surface configuration, while only small hysteresis is observed when measured from the back surface.
SOLID STATE IONICS
(2022)
Article
Chemistry, Physical
Kan Hatakeyama-Sato, Momoka Umeki, Hiroki Adachi, Naoaki Kuwata, Gen Hasegawa, Kenichi Oyaizu
Summary: Data-driven material exploration is an important research method, but recording, analyzing, and sharing daily experimental results can be difficult. We have developed a data platform that accurately describes the relationships between structures, properties, and processes, and applied it to explore organic superionic glassy conductors through over 500 experiments. Automated data analysis has revealed the key factors for achieving remarkable room temperature ionic conductivity and Li+ transference number. Unlike previous research, all experimental results, including graphs, raw measurement data, and data processing systems, are accessible to everyone in a public repository. This direct data sharing will enhance scientific communication and accelerate the integration of material knowledge.
NPJ COMPUTATIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Yosuke Ugata, Gen Hasegawa, Naoaki Kuwata, Kazuhide Ueno, Masayoshi Watanabe, Kaoru Dokko
Summary: The study investigated the transport properties of Li salt/sulfolane (SL) electrolytes as a function of temperature. It was found that Li+ ion diffuses faster than other ions in highly concentrated electrolytes, indicating the occurrence of Li+-ion hopping conduction. The results provide important insights for designing electrolytes for advanced Li batteries.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Kento Ishii, Tetsuo Uchikoshi, Shogo Miyoshi, Machiko Ode, Takahisa Ohno, Kazunori Takada
Summary: The chemical reactivity and thermal stability of NASICON-type solid lithium-ion conductive materials with Olivine-type cathode active material were evaluated. It was found that the LATP-LCP system can be sintered in air, forming a dense microstructure at 900 degrees C. On the other hand, the LAGP-LCP system melts at 800 degrees C. This study suggests that the LATP-LCP system is an excellent combination of electrolyte and cathode active material.
Article
Chemistry, Physical
Gen Hasegawa, Naoaki Kuwata, Kenjiro Hashi, Yoshinori Tanaka, Kazunori Takada
Summary: Pulsed-field gradient nuclear magnetic resonance (PFG-NMR) was used to measure the temperature dependence of lithium diffusion coefficient in polycrystalline Li0.29La0.57TiO3 (LLTO). The microstructure of LLTO consists of randomly oriented grains and 90 degrees domains. The NMR and conductivity diffusion coefficients exhibit non-Arrhenius behavior, indicating a change in the mobility of Li+ ions in LLTO.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
Masahito Ikeda, Randy Jalem, Gen Hasegawa, Naoaki Kuwata, Qiumin Liu, Takafumi Yamamoto, Kei Shigematsu, Yoshitaka Tateyama, Masaki Azuma
Summary: A new LISICON-type solid-state electrolyte in Li3BO3-Li3PO4-Li2SO4 ternary system was theoretically investigated and predicted to have high Li-ion conductivity. The experimental results, however, showed a lower conductivity, possibly due to structural differences.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Electrochemistry
Naoya Masuda, Kiyoshi Kobayashi, Futoshi Utsuno, Naoaki Kuwata
Summary: This study investigates the electrochemical stability of Li-5.4(PS4)(S0.4Cl1.0Br0.6) as a solid electrolyte in all-solid-state batteries. The results demonstrate the high chemical stability of Li-5.4(PS4)(S0.4Cl1.0Br0.6) against Li(Ni0.8Co0.1Mn0.1)O-2, providing new insights for the design of electrolyte materials for high-performance and stable all-solid-state lithium-ion batteries.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Quynh T. N. Phan, Junichi Kawamura, Kazue Kurihara
Summary: This study systematically investigates the molecular mechanism of SEI formation and the effect of the additive VC in LMO cathode material for lithium-ion batteries. The results demonstrate that carbonate solvents and VC spontaneously decompose on the LMO surface to form new compounds, and the electrochemical reaction of VC increases the LiF/MnF2 ratio in the SEI layer.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Fumihiko Ichihara, Shogo Miyoshi, Takuya Masuda
Summary: The reaction of LiCoO2 (LCO) and Li1.3Al0.3Ti1.7(PO4)3 (LATP) proceeds through multiple steps, as revealed by X-ray diffraction (XRD) and X-ray absorption near edge structure (XANES) analysis. The final products are LiCoPO4, CoTiO3, TiO2, and Li3PO4.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Gen Hasegawa, Naoaki Kuwata, Yoshinori Tanaka, Takamichi Miyazaki, Norikazu Ishigaki, Kazunori Takada, Junichi Kawamura
Summary: The study focused on the tracer diffusion coefficient of lithium ions in LiCoO2 thin film, where D* values varied depending on compositions, and decreased steeply approaching x = 1.0. Our method showed good agreement with electrochemically determined diffusion coefficients, indicating c-axis diffusion occurs through additional diffusion channels.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)