Article
Materials Science, Multidisciplinary
Seda Aysel Tepe, Murat Danisman, Nurhan Cansever
Summary: Titanium and titanium dioxide are popular and promising materials in today's world. Anodic oxidation of titanium thin films can alter their crystalline structure and electrochemical properties, and induce compressive stress in the oxide films.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
K. Naveen Kumar, Habibuddin Shaik, Jyothi Gupta, Sheik Abdul Sattar, R. Imran Jafri, Amulya Pawar, V Madhavi, Ashok G. Reddy, G. Nithya
Summary: Tungsten oxide thin films and nano pillars were grown using DC magnetron sputtering, with oxygen partial pressure and surface to volume ratio having a significant impact on coloration efficiency.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Energy & Fuels
Daniela De Luca, V. Amrutha, V. Praveen Kumar, S. Latha, Parthasarathi Bera, Antonio Caldarelli, Eliana Gaudino, Roberto Russo, Harish C. Barshilia
Summary: Thin films of hafnium and hafnium carbide were deposited using pulsed magnetron sputtering in an atmosphere of argon and acetylene. Different flow rates of acetylene gas were used to form distinct HfCx compounds and analyze their properties. The accurate knowledge of the complex refractive index of HfCx is essential for designing optical structures for energy conversion purposes.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2023)
Article
Materials Science, Multidisciplinary
Diederik Depla
Summary: The chemical stability of silver films with a thickness below 50 nanometer deposited on glass using DC magnetron sputtering was investigated. The films were exposed to a droplet of a HCl solution in a humid atmosphere and the affected area was monitored. It was found that the affected area increased linearly with time, indicating a diffusive mechanism. The diffusivity was measured as a function of the acid concentration, the presence of an aluminum seed layer, and film thickness, showing a linear correlation with acid concentration and a more complex behavior with film thickness.
Article
Materials Science, Multidisciplinary
K. Naveen Kumar, Habibuddin Shaik, V Madhavi, R. Imran Jafri, Jyothi Gupta, G. Nithya, Sheik Abdul Sattar, G. V. Ashok Reddy
Summary: This study investigates the characteristics of tungsten oxide thin films grown using the GLAD technique at different substrate angles. The results show that the films have an amorphous structure, with columnar growth and surface porosity. As the GLAD angle increases, the optical transmittance and bandgap of the films decrease. The study also reveals that the GLAD angle influences the coloration efficiency and diffusion coefficient.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Chemistry, Physical
B. F. Malvasio, L. M. Isola, M. F. Giordana, J. A. Malarria
Summary: In this study, Ti-rich NiTiCo thin films were produced and annealed at different temperatures to investigate their microstructures and shape memory behavior. It was found that the sample annealed at 773 K exhibited Guinier-Preston (GP) zones, while Ti2Ni precipitates were observed in the samples annealed at 873 K and 973 K. A higher recoverable strain and negligible irreversible strain were observed in the 773 K annealed sample compared to the others.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Coatings & Films
Thomas R. Koenig, Zhaoxia Rao, Eric Chason, Garritt J. Tucker, Gregory B. Thompson
Summary: The study investigates the stress and microstructural evolution of Ni thin films under various sputtering conditions. A kinetic model is used to understand the factors contributing to the intrinsic stress development and their relationship with microstructure. It was found that bimodal grain size distribution in films deposited at the lowest pressure deviated from the model's predictions, impacting the overall fit of the model to experimental data.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Chemistry, Physical
Angel Trivino-Pelaez, Domingo Perez-Coll, Jadra Mosa, Clemens Ritter, Ulises Amador, Glenn C. Mather
Summary: This study focuses on the influence of barium deficiency on the structure, stability, and electrical conductivity of BCY20, showing that barium-deficient materials have greater distortion, free volume, and conductivity compared to BCY20.
JOURNAL OF POWER SOURCES
(2021)
Article
Materials Science, Multidisciplinary
Nicolas Martin, Jean-Marc Cote, Joseph Gavoille, Valerie Potin
Summary: Tantalum oxide thin films were deposited using DC reactive magnetron sputtering from a tantalum metallic target and argon + oxygen. The introduction time of the reactive gas, t(ON), during the deposition was found to be a key parameter in the formation of either homogeneous tantalum oxides or periodic Ta/TaOx multilayers. It was also discovered that the optical transmittance and electrical conductivity of the films exhibited a gradual evolution from metallic to semiconducting and finally to dielectric properties as a function of the oxygen concentration.
Article
Materials Science, Ceramics
Berceste Beyribey, Hwan Kim, Joshua Persky
Summary: BaCe0.7Zr0.1Y0.16Zn0.04O3-δ perovskite shows great potential as an electrolyte in industrial steam electrolysis applications, with excellent protonic conductivity and stability, especially at elevated temperatures. The formation/degradation of secondary phases in wet atmospheres is attributed to the formation of Ba(OH)2 and CeO2 around 500 degrees C. This material is a promising candidate for industrial fuel cells and steam electrolysers.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Coatings & Films
Jimmy Thornberg, Stanislav Mraz, Justinas Palisaitis, Fedor F. Klimashin, Pavel Ondracka, Babak Bakhit, Peter Polcik, Szilard Kolozsvari, Lars Hultman, Ivan Petrov, Per O. a. Persson, Jochen M. Schneider, Johanna Rosen
Summary: Understoichiometric Ti(1-x)Al(x)B(2-y) diboride coatings were successfully deposited using DCMS and HiPIMS. The mechanical properties of the coatings were evaluated, showing a decrease in hardness and elastic modulus with increasing Al concentration. The oxidation behavior of the coatings was also studied, revealing that the films with low B content exhibited better oxidation resistance compared to films with higher B content.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Christopher Perez, Aaron J. Mcleod, Michelle E. Chen, Su-In Yi, Sam Vaziri, Ryan Hood, Scott T. Ueda, Xinyu Bao, Mehdi Asheghi, Woosung Park, A. Alec Talin, Suhas Kumar, Eric Pop, Andrew C. Kummel, Kenneth E. Goodson
Summary: Aluminum nitride (AlN) is an electrically insulating material with excellent thermal conductivity. This study demonstrates the deposition of AlN films at low temperatures using sputtering, and analyzes their thermal properties based on grain size and interfacial quality. The results show that varying the partial pressure of reactive N2 can significantly alter the thermal conductivity of the films, and the defect densities can be estimated from the measurements, providing insights for optimizing the thermal engineering of AlN.
Article
Chemistry, Multidisciplinary
Jesse Daughtry, Abdulrahman S. Alotabi, Liam Howard-Fabretto, Gunther G. Andersson
Summary: The research aims to examine the properties required for producing thin films of TiO2 using RF plasma, with the ability to modify the films through heating to induce defects and change their characteristics. Different deposition regimes were studied to minimize unwanted contaminants and the resulting TiO2 films showed a lower cost alternative to single-crystal TiO2 with known elemental composition and modifiable properties.
NANOSCALE ADVANCES
(2021)
Article
Materials Science, Coatings & Films
Babak Bakhit, Daniel Primetzhofer, Eduardo Pitthan, Mauricio A. Sortica, Eleni Ntemou, Johanna Rosen, Lars Hultman, Ivan Petrov, Grzegorz Greczynski
Summary: Boron-containing materials exhibit unique properties dependent on their chemical bonding and elemental compositions. Compositional analysis of transition-metal diboride thin films using various techniques reveals discrepancies in measuring boron content, emphasizing the importance of combining methods for accurate composition determination.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2021)
Article
Electrochemistry
Erwin Hueger, Chao Jin, Harald Schmidt
Summary: The C-rate capability of two thicknesses (230 nm and 16 nm) of ion-beam sputter-deposited amorphous carbon films in lithium-ion batteries was investigated. The films showed irreversible losses during the first five cycles and then reversible cycling similar to graphite. Differential charge and differential capacity curves revealed three Li+ uptake and release peaks. Irreversible Li bonding was found at the surface and in the bulk, while reversible Li bonding might occur in nano-domains and defects.
JOURNAL OF APPLIED ELECTROCHEMISTRY
(2022)
Correction
Chemistry, Physical
R. A. Budiman, S. Hashimoto, Y. Fujimaki, T. Nakamura, K. Yashiro, K. Amezawa, T. Kawada
SOLID STATE IONICS
(2021)
Article
Energy & Fuels
Qiuyu Liu, Chenghao Jia, Mengzhen Zhou, Zuyun He, Zhiheng Gong, Yihan Ling, Xinxin Wang, Keiji Yashiro, Yan Chen
Summary: By shrinking the size of SrNb0.1Co0.7Fe0.2O3-delta (SNCF) to the nanoscale, a modulated reaction pathway has been reported which leads to significantly enhanced OER activity. Oxygen vacancies on the surface of SNCF nanofibers were found to decouple the proton and electron transfer, as revealed by pH dependence study and H/D isotopic labeling experiments.
Article
Chemistry, Multidisciplinary
Masahiro Nishimoto, Sho Kitano, Damian Kowalski, Yoshitaka Aoki, Hiroki Habazaki
Summary: Commercial FeNiCo alloy can be converted to a highly active electrocatalyst for oxygen evolution reaction through galvanostatic anodizing, demonstrating high activity and durability for OER. Fluorides containing Fe, Ni, and Co are excellent precursors for forming oxyhydroxides with high OER activity and durability.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Chemistry, Physical
Shinichi Hata, Keita Iwamoto, Sho Kitano, Hiroki Habazaki, Akari Hirakawa, Nanami Tani, Yukou Du, Yukihide Shiraishi, Naoki Toshima
Summary: A room-temperature wet chemical method was developed for preparing a Pd/ZIF-8 catalyst with high crystallinity and large surface area, suitable for the reduction of isomeric nitrophenols.
COLLOID AND INTERFACE SCIENCE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Yige Wang, Chuan Jia, Zewei Lyu, Minfang Han, Junwei Wu, Zaihong Sun, Fumitada Iguchi, Keiji Yashiro, Tatsuya Kawada
Summary: The study demonstrates that dense GDC interlayers with a thickness of 1 mm can be successfully manufactured using the physical vapor deposition method. The GDC interlayer sintered at 1100 degrees C exhibits the lowest degradation rate during cell operation, attributed to its most effective inhibition of Sr diffusion.
JOURNAL OF MATERIOMICS
(2022)
Article
Chemistry, Physical
Ruijie Zhu, Huijun Yang, Wei Cui, Laras Fadillah, Tianhong Huang, Zetao Xiong, Chunmei Tang, Damian Kowalski, Sho Kitano, Chunyu Zhu, Daniel R. King, Takayuki Kurokawa, Yoshitaka Aoki, Hiroki Habazaki
Summary: This study successfully eliminates the growth of dendritic zinc crystals on the anode by using a high strength hydrogel polymer electrolyte, resulting in a long-lasting and stable zinc anode. This achievement brings high capacity and long lifespan zinc-ion batteries one step closer to practical application.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Materials Science, Multidisciplinary
Yuta Kimura, Takashi Nakamura, Koji Amezawa, Keiji Yashiro, Tatsuya Kawada
Summary: This study evaluated the elastic moduli of LN214, a potential cathode material for SOFCs, using the resonance method, finding that the elastic moduli decrease with increasing interstitial oxygen concentration. Analysis based on numerically obtained lattice energy showed that the P(O-2) dependence of the Young's modulus of LN214 is essentially explained by variations in the c-lattice constant triggered by changes in interstitial oxygen concentration. These findings contribute to a better understanding of the relationship between lattice defects and mechanical properties, ultimately improving the mechanical stability of SOFCs.
Article
Chemistry, Physical
Yoshitaka Aoki, Shinichi Nishimura, SeongWoo Jeong, Sho Kitano, Hiroki Habazaki
Summary: This study presents the development of hydrogen-permeable metal support electrolysis cells (HMECs) with a heterojunction of H+-conducting BaZrxCe0.8-xY0.2O3-delta electrolyte and H-permeable Pd. The HMECs showed a higher voltage and Faradaic efficiency than predicted for ceramic electrolysis cells, which could be attributed to a decrease in hole carriers near the BZCY/Pd heterointerface.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Junya Tanaka, Kazuhisa Sato, Keiji Yashiro, Tatsuya Kawada, Toshiyuki Hashida
Summary: This study investigates the deformation behavior of the anode during reduction and the effect of reduction conditions using NiO-YSZ. It is found that the Ni volume fraction is a major factor, with low Ni volume fraction samples showing expansion and high Ni volume fraction samples showing shrinkage. The expansion behavior is due to the release of compressive residual stress on the YSZ side during reduction.
JOURNAL OF POWER SOURCES
(2022)
Article
Chemistry, Physical
Junya Tanaka, Kazuhisa Sato, Keiji Yashiro, Tatsuya Kawada, Toshiyuki Hashida
Summary: The microstructure of anodes significantly affects their deformation, with different deformation mechanisms classified based on analysis. Numerical analysis demonstrates that larger anode deformation leads to higher cell stress, potentially impacting mechanical reliability of cells. Selecting optimal anode composition can prevent cell stress change due to anode deformation. The YSZ-Ni content diagram provides fundamental knowledge for designing optimal microstructure in anodes of SOFCs.
JOURNAL OF POWER SOURCES
(2022)
Article
Electrochemistry
Mirai Takeda, Keiji Yashiro, Riyan Achmad Budiman, Shinichi Hashimoto, Tatsuya Kawada
Summary: Electrochemical measurements are conducted on a Ni-dense electrode in a YSZ electrolyte to investigate the relationship between capacitance and double-phase boundary (DPB) of Ni-YSZ. By varying the electrode diameter, the capacitance is found to be proportional to the DPB area. This correlation is further confirmed in electrochemical measurements of the Ni-YSZ porous electrode using a transmission-line model.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Riyan Achmad Budiman, Shin-Ichi Hashimoto, Deni Shidqi Khaerudini, Keiji Yashiro, Tatsuya Kawada
Summary: This study determines the oxygen vacancy concentration (delta), electrochemical reaction, and durability of LaNiO3-delta, a perovskite-type oxide, as functions of temperature (773-1073 K) and oxygen partial pressure. The results show that LaNiO3-delta has a higher oxygen partial molar enthalpy at delta approximate to 0, indicating the ease of oxygen vacancy formation. The electrochemical properties and durability of LaNiO3-delta were investigated, and impedance spectra analysis revealed three components of the electrode reaction. Further experiments demonstrated the stable performance of the LaNiO3-delta porous electrode under specific conditions.
SOLID STATE IONICS
(2023)
Article
Chemistry, Physical
Hiroyuki Okada, Etsushi Tsuji, Miho Hisada, Sho Kitano, Hiroki Habazaki, Satoshi Suganuma, Naonobu Katada
Summary: In this study, a sol-gel method was used to synthesize Ca2Fe2-xCoxO5 composite oxide, which was then tested for the oxygen evolution reaction (OER) under neutral conditions. The results showed that Ca2Fe2-xCoxO5 exhibited higher activity and durability compared to other perovskite-type oxides. The brownmillerite structure played an important role in the catalytic activity under neutral conditions.
SUSTAINABLE ENERGY & FUELS
(2022)
Article
Chemistry, Physical
Chunmei Tang, Katsuya Akimoto, Ning Wang, Laras Fadillah, Sho Kitano, Hiroki Habazaki, Yoshitaka Aoki
Summary: By using La0.5Sr0.5CoO3-delta (LSC) thin film as an anode functional layer, the electrolysis performance of Protonic solid oxide steam electrolysis cells (P-SOECs) based on BaZrxCe0.8-xYb0.1Y0.1O3-delta proton conductors can be significantly improved. This improvement reduces both the ohmic and polarization resistances of the cell at high temperatures, leading to increased electrolysis current and Faraday efficiency.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Article
Chemistry, Physical
Ruijie Zhu, Huijun Yang, Laras Fadillah, Zetao Xiong, Damian Kowalski, Chunyu Zhu, Sho Kitano, Yoshitaka Aoki, Hiroki Habazaki
Summary: The new design of the lithium anode significantly improves cycling stability by reducing proton transport resistance and concentration polarization, achieving automatic cleaning of dead Li.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
