Article
Materials Science, Ceramics
Stephan Stich, Kuan Ding, Qaisar Khushi Muhammad, Lukas Porz, Christian Minnert, Wolfgang Rheinheimer, Karsten Durst, Juergen Roedel, Till Froemling, Xufei Fang
Summary: Experimental modulation of dislocation-based plasticity in single-crystal SrTiO3 by increasing oxygen vacancy concentration impacts dislocation nucleation and motion. This is evidenced by nanoindentation and bulk compression tests on a nano-/microscale level.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Review
Engineering, Environmental
Jinchang Sun, Yu Zhang, Yuting Fan, Xinfeng Tang, Gangjian Tan
Summary: This review article summarizes recent research progress on PbSe-based thermoelectric materials. It provides a general introduction to the properties of IV-VI semiconductors, discusses the crystal and electronic band structures of PbSe, and explores how dopants regulate its carrier concentrations. The article also elaborates on the impact of electronic band structure engineering and microstructural architecturing on charge and phonon transport properties of PbSe. It concludes by discussing future directions for improving the thermoelectric properties of PbSe and promoting its applications.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Biomedical
Subhasmita Swain, Chris Bowen, Tapash Rautray
Summary: Strontium substitution was achieved in hydroxyapatite and barium titanate composites to mimic the electrical properties of natural bone. The 10SrHA-10BST composite showed superior osteoblast activity and polarized composites exhibited promising antibacterial effects against Staphylococcus aureus.
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A
(2021)
Article
Chemistry, Physical
Arindom Chatterjee, Zhenyun Lan, Dennis Valbjorn Christensen, Federico Bauitti, Alex Morata, Emigdio Chavez-Angel, Simone Sanna, Ivano E. Castelli, Yunzhong Chen, Albert Tarancon, Nini Pryds
Summary: The study focused on the fabrication of thermoelectric thin films doped with SrTiO3-based oxides, showing a decrease in electrical conductivity, carrier density, and thermoelectric Seebeck coefficient as the film thickness decreases.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Ji-Eun Lee, Kyoo Kim, Van Quang Nguyen, Jinwoong Hwang, Jonathan D. Denlinger, Byung Il Min, Sunglae Cho, Hyejin Ryu, Choongyu Hwang, Sung-Kwan Mo
Summary: The thermoelectric performance of SnSe is strongly influenced by the low-energy electron band structure, which provides a high density of states in a narrow energy range due to the multi-valley valence band maximum (VBM). The binding energy of the VBM in SnSe is found to be tuned by the population of Sn vacancies, which is determined by the cooling rate during sample growth, as revealed by angle-resolved photoemission spectroscopy measurements and first-principles calculations. The shift in VBM closely correlates with the thermoelectric power factor, while the effective mass remains largely unchanged with variations in Sn vacancy population. These findings demonstrate that the low-energy electron band structure plays a crucial role in the high thermoelectric performance of hole-doped SnSe, offering a promising route to engineering intrinsic defect-induced thermoelectric performance through sample growth conditions without requiring additional ex-situ processes.
Article
Materials Science, Ceramics
Matthaeus Siebenhofer, Federico Baiutti, Juan de Dios Sirvent, Tobias M. Huber, Alexander Viernstein, Stefan Smetaczek, Christopher Herzig, Maciej Oskar Liedke, Maik Butterling, Andreas Wagner, Eric Hirschmann, Andreas Limbeck, Albert Tarancon, Jurgen Fleig, Markus Kubicek
Summary: The defect chemistry and electronic trapping energies in undoped single crystalline SrTiO3 were investigated using electrochemical impedance spectroscopy and positron annihilation lifetime spectroscopy. The results showed that the chemical capacitance is a valuable tool for establishing a defect model based on electrochemical measurements and analyzing defect concentrations. The chemical capacitance analysis and positron annihilation lifetime spectroscopy are consistent in quantifying the defect concentrations in SrTiO3.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Zhouhui Li, Ao Huang, Shuang Yang, Lvping Fu, Meijie Zhang, Huazhi Gu
Summary: In this study, AZO/SrTiO3 composites were successfully fabricated, and it was found that the addition of SrTiO3 promoted the densification of the composites, increased the electrical conductivity, and enhanced the thermoelectric performance, making it a promising high-temperature thermoelectric material.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Yuqiao Zhang, Hai Jun Cho, Kenyu Sugo, Masashi Mikami, Sungmin Woo, Myung-Chul Jung, Yao-Hua Zhuang, Bin Feng, Yu-Miin Sheu, Woosuck Shin, Woo Seok Choi, Myung Joon Han, Yuichi Ikuhara, Hiromichi Ohta
Summary: The study shows that the thermal conductivity of electron-doped SrTiO3 is lower than assumed, with the highest ZT exceeding 0.1 at room temperature. The impact of carrier concentration on thermal conductivity varies in different solid solutions, providing insights for the future design of electron-doped SrTiO3-based thermoelectric materials.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Nanoscience & Nanotechnology
Siru Chen, Xuan Liu, Jiabin Xiong, Liwei Mi, Yanqiang Li
Summary: Electrochemical nitrogen reduction reaction is a green and sustainable process that can replace the high energy and carbon-emitting Haber-Bosch reaction for ammonia synthesis. MoS2-based electrocatalysts have attracted significant research attention and shown promising progress in enhancing NRR performance through phase engineering, defect engineering, heteroatom doping, and interface engineering.
MATERIALS TODAY NANO
(2022)
Review
Chemistry, Multidisciplinary
Tingjun Wu, Jiwon Kim, Jae-Hong Lim, Min-Seok Kim, Nosang V. Myung
Summary: Thermoelectric devices have attracted significant attention in the 21st century due to their potential for sustainable energy harvesting and the development of higher performance materials through nanoscale science and defect engineering. Electrodeposition is a promising synthesis method for fabricating devices as it allows control over material morphology, composition, and crystal structure, with higher growth rates and environmental friendliness compared to vacuum processes.
FRONTIERS IN CHEMISTRY
(2021)
Article
Materials Science, Ceramics
Yu S. Orlov, S. N. Vereshchagin, S. Novikov, A. T. Burkov, A. A. Borus, M. Sitnikov, L. A. Solovyov, M. N. Volochaev, V. A. Dudnikov
Summary: The properties of Sr1-xSmxTiO3 solid solutions are significantly influenced by the preliminary mechanochemical activation, with samples reduced in hydrogen showing the highest thermoelectric power factor within a specific concentration range. Increasing the annealing temperature of mechanically activated samples leads to a further increase in electrical conductivity and power factor.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Zhiqiang Gao, Qingyu Yang, Pengfei Qiu, Tian-Ran Wei, Shiqi Yang, Jie Xiao, Lidong Chen, Xun Shi
Summary: This study reports the first p-type plastic inorganic TE material, which achieved both good plasticity and p-type conduction by alloying Cu in n-type plastic Ag2S0.7Se0.3. The hexagonal structure (Ag0.2Cu0.8)(2)S0.7Se0.3 exhibited a maximum zT of 0.42 at 800 K, and by introducing Cu deficiencies, the maximum zT was greatly enhanced to 0.95 at 800 K, a record-high value for plastic TE materials.
ADVANCED ENERGY MATERIALS
(2021)
Article
Crystallography
Christian Rodenbuecher, Christo Guguschev, Carsten Korte, Sebastian Bette, Kristof Szot
Summary: Recent research has found that the behavior of SrTiO3 under reducing conditions differs from traditional understanding, as it can transition from an insulating to a metallic state and remain stable. However, samples that have been oxidized at high temperatures cannot be transformed back to a metallic state through reduction, instead exhibiting semiconducting behavior.
Article
Chemistry, Physical
Xiangmei Yan, Sikang Zheng, Zizhen Zhou, Hong Wu, Bin Zhang, Yuling Huang, Xu Lu, Guang Han, Guoyu Wang, Xiaoyuan Zhou
Summary: This study reports significantly improved thermoelectric performance in Sb, Mn-codoped SnTe synthesized by energy-efficient melt spinning, achieving peak zT values that are 110% and 340% higher than those of SnTe. The enhancement in performance is attributed to intensified phonon scattering and valence band convergence, demonstrating the effectiveness of microstructure and band structure engineering in improving thermoelectric properties.
Article
Materials Science, Ceramics
N. Yalini Devi, K. Vijayakumar, P. Rajasekaran, A. S. Alagar Nedunchezhian, D. Sidharth, Shimomura Masaru, M. Arivanandhan, R. Jayavel
Summary: In this study, oxide thermoelectric materials were prepared with varying concentrations of Gd to achieve high crystalline cubic structured nanocomposites with different morphologies and electrical resistivity. The co-substituted samples showed higher Seebeck coefficient and power factor at high temperatures compared to the singly substituted samples.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Rui G. Pinto, Jorge R. Frade, Aleksey A. Yaremchenko
Summary: Single-phase cerium aluminate was successfully synthesized through controlled milling and firing in reducing or inert atmospheres. High-energy milling improved reactivity by promoting homogeneity and reducing Al oxidation, resulting in higher conversion rates. The choice of firing atmosphere also influenced the reaction outcome.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Daniela Lopes, Nuno F. Santos, Jorge P. Moura, Antonio J. S. Fernandes, Florinda M. Costa, Andrei Kovalevsky
Summary: Efficient energy storage from intermittent renewables can rely on alkaline electrolysis for converting temporary energy excess into oxygen and green hydrogen. Electrodes made of laser-induced graphene (LIG) materials are promising for water splitting but require proper design and processing optimization. This study focuses on the effects of laser processing on LIG electrode performance in alkaline media and provides guidelines for hydrogen production by selecting suitable laser processing conditions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Materials Science, Ceramics
I. Antunes, L. C. M. Ruivo, L. A. C. Tarelho, A. A. Yaremchenko, A. V. Kovalevsky, J. R. Frade
Summary: The manganese ferrite was synthesized by milling reactive siderite and MnO2 powder mixtures, with and without subsequent heat treatment. The impact of milling conditions and calcination temperature on conversion of precursors was assessed, based on XRD peaks intensities and thermogravimetry. The best conditions for complete conversion were obtained by milling at 650 rpm for 6 h and calcination at 650 degrees C. The processing conditions affected the structural features of the spinel phase, and the conversion of FeCO3 occurred more readily than MnO2.
CERAMICS INTERNATIONAL
(2023)
Article
Thermodynamics
Luis Ruivo, Tiago Silva, Daniel Neves, Luis Tarelho, Jorge Frade
Summary: The aim of this study was to develop a graphical approach to support the operation of iron-based catalysts under gasification conditions. Experimental data and thermodynamic modelling were used to understand the dependence of catalyst performance on the thermochemical conditions of producer gas. The results suggest that controlled process parameters can enhance the tolerance of iron-based materials to deactivation and stabilize relevant active phases.
Article
Materials Science, Multidisciplinary
N. M. Ferreira, F. Carreira, A. V. Kovalevsky, F. M. Costa, M. A. Valente
Summary: In this study, Ca1-xPrxMnO3 (x = 0.03, 0.06, 0.1) materials were prepared using the Laser Floating Zone (LFZ) technique under different pulling rates (25-100 mm/h) in air and argon atmospheres. The formation of secondary phases in (Ca,Pr)MnO3 fibers was promoted by the processing conditions, and the perovskite phase was observed at slower pulling rates. The effects of LFZ conditions on the phase composition, microstructural features, electric and magnetic properties of the fibers were analyzed and discussed. The results showed that LFZ processing conditions greatly influenced the electrical and magnetic properties of the prepared manganites. The formation of secondary phases increased with pulling rate, but additional heat treatment at high temperatures minimized their effects and improved the electrical conductivity and magnetization of the thermally-treated fibers.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Electrochemistry
Clara Boehme, Maksim Starykevich, Gabriel Constantinescu, Andrei V. Kovalevsky, Daniela V. Lopes
Summary: Iron ore can be used as a potential feedstock for the electrowinning of iron, but the presence of different iron oxide types poses difficulties and further studies are required to establish electrowinning as an alternative technology for iron production. Previous studies have shown adverse effects on the Faradaic efficiency when using magnetite as feedstock. This study demonstrates, for the first time, the possibility of obtaining relatively high Faradaic efficiencies (66%) with hematite-magnetite mixtures at low temperature (80 degrees C).
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Magdalena Kosiorek, Agnieszka Zurawska, Leszek Ajdys, Anna Kolasa, Yevgeniy Naumovich, Paulina Wiecinska, Aleksey Yaremchenko, Jakub Kupecki
Summary: This study focuses on the preparation and characterization of composite gaskets for sealing solid oxide cell stacks operating below 700 degrees C. The gaskets were made of BaO-Al2O3-CaO-SiO2 glass matrix with various additions of 3 mol.% yttria partially stabilized zirconia. The results showed that glass-ceramic composites, particularly the one with 40 wt.% YSZ, exhibited promising properties for gaskets in SOC stacks.
Article
Chemistry, Physical
Kiryl Zakharchuk, Andrei Kovalevsky, Aleksey Yaremchenko
Summary: Ruddlesden-Popper La2-xBaxNiO4 +/-delta (x = 0-1.1) nickelates were synthesized and evaluated for electrocatalytic applications. The study included characterization of structural, microstructural, and dilatometric properties, determination of oxygen nonstoichiometry, measurement of electrical conductivity and oxygen permeability, and assessment of chemical compatibility. The formation of phase-pure solid solutions was limited to x = 0.5. The substitution of lanthanum by barium in La2-xBaxNiO4+delta resulted in a decrease in oxygen excess and the generation of electron-holes, leading to an increase in p-type electronic conductivity. The ceramics showed moderate thermal expansion coefficients and good chemical compatibility with BaZr0.85Y0.15O3-delta solid electrolyte.
Article
Chemistry, Physical
Denis Alikin, Kiryl Zakharchuk, Wenjie Xie, Konstantin Romanyuk, Maria J. Pereira, Blanca I. Arias-Serrano, Anke Weidenkaff, Andrei Kholkin, Andrei V. Kovalevsky, Alexander Tselev
Summary: Thermoelectric conversion could play a significant role in future energy technologies. Oxide-based thermoelectric composite ceramics have attracted attention as a promising approach to control electrical and thermal conductivity for improved thermoelectric performance. However, the variability of composite properties, even with identical preparation routes, requires detailed studies of thermal transport at the local scale in order to be understood.
Article
Engineering, Biomedical
Maria P. P. Sousa, Catarina T. T. Passos, Marian Fuersatz, Haeshin Lee, Sonia G. Patricio, Joao F. Mano, Sylvia Nuernberger
Summary: Articular cartilage injuries are a major health concern due to their limited self-renewal capacity, leading to increased economic burden in the healthcare system. The development of cell implantation strategies using a suitable delivery platform holds promise for increasing cell retention and providing sufficient cells for cartilage repair. This study reports the development of anisotropically patterned mussel-inspired membranes with nanotopography and catechol molecular cues for efficient cell delivery. The membranes demonstrate successful cell migration and retention on cartilage surfaces, making them a promising strategy for cell-based therapies.
ADVANCED NANOBIOMED RESEARCH
(2023)
Article
Chemistry, Physical
Martin Fabian, Blanca I. Arias-Serrano, Jaroslav Briancin, Aleksey Yaremchenko
Summary: Gadolinium aluminate and its calcium-substituted derivates were prepared through mechanochemical processing of oxide precursors. Sintering at 1450 degrees C resulted in porous ceramics. The electrical conductivity of the sintered samples increased significantly with calcium substitution but had limited effect with further doping. Grain boundaries were found to contribute significantly to the total resistivity of the calcium-substituted ceramics.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Kiryl Zakharchuk, Andrei Kovalevsky, Aleksey Yaremchenko
Summary: The phase relationships in the BaFe1-x-yZryNixO3-delta system were investigated for the potential application in solid electrolyte cells. Co-substitutions of zirconium and nickel into barium ferrite resulted in a stable perovskite structure in a limited range. The characterization of BaFe0.7Zr0.3-xNixO3-delta perovskites included the determination of oxygen nonstoichiometry variations, electrical conductivity measurements, thermal expansion studies, and chemical compatibility assessment. The optimal doping level was found to be x = y = 0.15 as it exhibited the best chemical compatibility with selected solid electrolytes.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Vanessa C. D. Graca, Laura I. V. Holz, Francisco J. A. Loureiro, Glenn C. Mather, Duncan P. Fagg
Summary: In recent years, there has been increasing interest in transition metal oxynitrides due to their attractive properties, such as high conductivity, hardness, and catalytic activity. Among them, niobium oxynitrides have shown great potential for various applications. This study focuses on the impact of ammonolysis conditions on the crystalline phase formation of niobium oxynitride compounds. The results demonstrate that careful control of ammonolysis conditions can tailor the anion composition, cation/anion ratio, and crystallographic structure of the materials.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)