Article
Chemistry, Physical
Jin Goo Lee, Aaron B. Naden, Cristian D. Savaniu, Paul A. Connor, Julia L. Payne, Jonathan M. Skelton, Alexandra S. Gibbs, Jianing Hui, Stephen C. Parker, John T. S. Irvine
Summary: This study shows an enhanced proton conductivity of defective calcium titanate Ca0.92TiO2.84(OH)(0.16) prepared by replacing lattice oxygens with hydroxyl groups via a solvothermal route, exhibiting a bulk conductivity one order of magnitude higher than hydrated stoichiometric CaTiO3. Additionally, replacement of Ca2+ by Ni2+ in the Ca1-xTi1O3-2x(OH)(2)(x) is demonstrated, leading to the exsolution of metallic Ni nanoparticles along orthorhombic crystal planes upon reduction. These results suggest a new strategy for targeted energy applications by tailoring defect chemistry through hydration or cation doping followed by exsolution.
ADVANCED ENERGY MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Xiangyu Xu, Jian Yang, Yaqiong Guo, Shuangfeng Wu, Qin Cao, Jiazhen Wu, Jungu Xu
Summary: Accepter-doped LaNbO4 is a promising proton conductor, but its low proton conductivity hinders its widespread application. In this study, Li-doped La1-x Li x NbO4-x materials were prepared and studied, revealing a low solubility for Li at the La site.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2022)
Article
Chemistry, Physical
Jinchang Sun, Wenjun Cui, Chenghao Xie, Tian Yu, Fan Yan, Zhiquan Chen, Xiahan Sang, Xinfeng Tang, Gangjian Tan
Summary: In this study, the presence of Pb vacancies in Sn-substituted Pb0.98Na0.02Se was effectively inhibited by doping a dilute amount of Te, leading to a remarkable recovery of carrier mobility. Moreover, Te doping resulted in a significant reduction in lattice thermal conductivity by reinforcing phonon scattering. As a result, the average ZT value of Pb0.97Sn0.01Na0.02Se was doubled upon 6 mol % Te doping between 300 and 773 K.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Materials Science, Ceramics
A. S. Lesnichyova, S. A. Belyakov, A. Yu Stroeva, A. V. Kuzmin
Summary: Through a series of experiments, it was found that La0.9Sr0.1ScO3-delta exhibits the highest proton conductivity at 800 degrees Celsius, making it suitable for various electrochemical devices. The study results indicate that an increase in Sr dopant concentration will increase the partial conductivity of each charge carrier.
CERAMICS INTERNATIONAL
(2021)
Article
Spectroscopy
N. Tarasova, A. Galisheva, I Animitsa
Summary: The local structure of acceptor and donor doped solid solutions based on BaLaInO4 was investigated, confirming the appearance of new defects in the crystal lattice. Both solid solutions showed an increase in symmetry and interlayer space with dopant concentration. The transport properties exhibited similar tendencies, with increases in ionic conductivity at low concentration and decreases at high concentrations due to different factors. The most conductive material identified was Ba1.1La0.9InO3.95 with a Ruddlesden-Popper structure.
JOURNAL OF RAMAN SPECTROSCOPY
(2021)
Article
Chemistry, Physical
Anastasia V. Egorova, Ksenia G. Belova, Irina E. Animitsa
Summary: The LaIn1-xZnxO3-1/2x samples were synthesized for the first time via solid-state reaction method. The effect of Zn2+ doping on the structure, water uptake and electrical properties of LaInO3 was investigated. The results show that Zn2+ is a good alternative to alkaline earth metals and improves the conductivity of the ceramics. The phase exhibits oxygen-ionic transport at temperatures below 500°C and protonic transport at temperatures below 600°C.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Review
Materials Science, Multidisciplinary
Rotraut Merkle, Maximilian F. Hoedl, Giulia Raimondi, Reihaneh Zohourian, Joachim Maier
Summary: The study focuses on the defect behavior and applications of oxides with mixed protonic and p-type electronic conductivity, discussing their potential value and future development trends in protonic ceramic electrochemical cells.
ANNUAL REVIEW OF MATERIALS RESEARCH, VOL 51, 2021
(2021)
Article
Electrochemistry
R. D. Andreev, I. A. Anokhina, D. V. Korona, A. R. Gilev, I. E. Animitsa
Summary: The complex oxide Ba5In1.9Y0.1Al2ZrO13 with hexagonal perovskite structure was successfully synthesized. Protons in the structure are present as energetically different OH--groups involved in hydrogen bonds. Yttrium-doping does not significantly affect the oxygen-ion-conductivity, but acceptor doping increases it by 1.3 times. Both doping types enhance the proton conductivity and concentration. The degree of hydration depends on the cell parameters and the availability of space for OH--groups. Below 600℃ in a humid atmosphere, proton transport dominates in Ba5In2Al2ZrO13, Ba5In2.1Al2Zr0.9O12.95, and Ba5In1.9Y0.1Al2ZrO13 phases.
RUSSIAN JOURNAL OF ELECTROCHEMISTRY
(2023)
Article
Materials Science, Ceramics
Inna A. Zvonareva, Anna V. Kasyanova, Artem P. Tarutin, Gennady K. Vdovin, Julia G. Lyagaeva, Dmitry A. Medvedev
Summary: Systematic studies on BaZr0.8-xSnxSc0.2O3-delta revealed that the composition with x = 0.1 exhibits the highest values in terms of ionic and grain conductivities. Low-level substitution of Zr4+ with Sn4+ ions shows promise in designing new proton-conducting electrolytes for high-temperature applications.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
Hiroki Uehara, Akihiro Ishii, Itaru Oikawa, Hitoshi Takamura
Summary: A new mixed proton-hole conducting material is developed by doping cobalt into BaZr1-xScxO3-delta, which exhibits high hole conductivity. The study investigates the phases present, proton incorporation, and electrical conductivity of BaCoxZr0.9-xSc0.1O3-delta. It is found that Sc doping increases the cobalt solubility limit in BaZrO3 and conductive protons are incorporated in the bulk portion of Co, Sc-doped BaZrO3. BaCoxZr0.9Sc0.1O3-delta shows higher conductivity than Fe or Pr doped BaMxZr1-x-yYyO3-delta. The maximum conductivity is achieved for BaCo0.2Zr0.7Sc0.1O3-delta in both wet and dry oxidizing atmospheres.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
A. V. Shlyakhtina, N. V. Lyskov, T. Salkus, A. Kezionis, M. V. Patrakeev, I. A. Leonidov, L. G. Shcherbakova, S. A. Chernyak, K. I. Shefer, E. M. Sadovskaya, N. F. Eremeev, V. A. Sadykov
Summary: In this study, new compounds of erbium and thulium molybdates were analyzed using various methods, revealing their different ionic conductivity in dry and wet environments, showing mixed oxygen-electronic conductors at high temperatures, and demonstrating that fluorites have higher oxygen ion mobility compared to bixbyites.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Materials Science, Multidisciplinary
M. Siblani, M. Ollivier, L. Favergeon, P. Chartrand
Summary: The high affinity of Ti-6Al-4 V (Ti64) powder to oxygen affects its quality in additive manufacturing. The oxide scale is composed of an outer layer of α-Al2O3 and an inner layer of TiO2. Experimental and thermodynamic findings provide insights into the formation of these two oxide layers. The inert marker demonstrates anionic growth of the duplex oxide scale. The thermodynamic results indicate that interstitial aluminum rapidly infiltrates and diffuses within TiO2 (rutile) to form Al2O3 on the surface. Additionally, α-Al2O3 is a non-stoichiometric oxide with a slight oxygen excess at high oxygen partial pressures. Impurities significantly impact the concentration of native point defects in this phase. Finally, a reaction mechanism with elementary steps for the oxidation of Ti64 powder is proposed.
Article
Materials Science, Multidisciplinary
Joseph Ngugi Kahiu, Samuel Kimani Kihoi, Ho Seong Lee
Summary: Substituting Bi on the Sb site in the Nb0.8Ti0.2FeSb half-Heusler thermoelectric material can effectively improve the thermoelectric performance, leading to a 36% higher ZT at 973 K compared to the sample without Bi doping.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Review
Energy & Fuels
Clarita Y. Regalado Vera, Hanping Ding, David Peterson, William T. Gibbons, Meng Zhou, Dong Ding
Summary: Doped barium zirconate is a material with high proton conductivity and chemical stability, considered promising for proton-conducting solid oxide electrochemical cells. While its proton conduction has been extensively studied, the specific phenomena behind its conduction properties are not fully understood. Specialized techniques and computational tools are beginning to elucidate the phenomena governing the material's conduction properties.
JOURNAL OF PHYSICS-ENERGY
(2021)
Article
Electrochemistry
Lei He, Feng Zhang, Yan Xuan, Lei Zhang, Huiying Gao, Huaqing Pan, Sen Lian, Mingyue Wang, Jikang Yin, Xue Chen, Junfeng Ren, Meina Chen
Summary: This study utilized first-principles calculations to investigate the effects of Nd and Y co-doping on the surface and bulk properties of hydration reaction and proton conduction in BaZrO3. The results showed that Nd and Y promoted the accumulation of oxygen vacancies and protons on the surface, facilitating the hydration reaction and promoting proton transmission. The segregation of Nd and Y also had beneficial effects on proton transport through grain boundaries in BZNY.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Chemistry, Applied
Kaiqi Xu, Athanasios Chatzitakis, Sanne Risbakk, Mingyi Yang, Paul Hoff Backe, Mathieu Grandcolas, Magnar Bjoras, Truls Norby
Summary: In this study, Co-based cocatalysts were electrodeposited on mesoporous Ta3N5 nanotubes to achieve a photocurrent density of 6.3 mA/cm(2) at 1.23 V vs. SHE under simulated solar illumination. The best performing electrode not only exhibited high photocurrent density, but also improved stability under intense photoelectrochemical water splitting conditions. The dual function of the cocatalyst in enhancing both photoelectrochemical performance and stability was highlighted.
Article
Chemistry, Physical
A. Lysik, T. Wejrzanowski, K. Cwieka, J. Skibinski, J. Milewski, F. M. B. Marques, T. Norby, W. Xing
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Article
Chemistry, Physical
Iga Szpunar, Ragnar Strandbakke, Magnus Helgerud Sorby, Sebastian Lech Wachowski, Maria Balaguer, Mateusz Tarach, Jose M. Serra, Agnieszka Witkowska, Ewa Dzik, Truls Norby, Maria Gazda, Aleksandra Mielewczyk-Gryn
Article
Materials Science, Multidisciplinary
J. Mayandi, R. K. Madathil, C. Abinaya, K. Bethke, V. Venkatachalapathy, K. Rademann, T. Norby, T. G. Finstad
Summary: This study reports on the structural and electrical characterization of zinc oxide material containing aluminum prepared using a co-precipitation technique with different zinc and aluminum precursors. The resulting material exhibits a nanostructured form with significantly reduced thermal conductivity.
Article
Chemistry, Physical
Xiaolan Kang, Chrysanthi Berberidou, Augustinas Galeckas, Calliope Bazioti, Einar Sagstuen, Truls Norby, Ioannis Poulios, Athanasios Chatzitakis
Summary: Defect-engineering of TiO2 can significantly affect its photocatalytic properties for degrading persistent pollutants. Introducing a combination of defects through post-annealing under different reducing atmospheres can improve the photocatalytic performance, especially for water purification and disinfection under visible light illumination.
Article
Instruments & Instrumentation
Raphael Schuler, Reshma K. Madathil, Truls Norby
Summary: The high temperature thermoelectric test setup is designed for the NORECS ProboStat (TM) sample holder cell, allowing testing of various interconnects and thermoelectric materials performance in controlled atmospheres.
The comparison between predicted and actual module performance highlights the importance of testing materials in combination, including interconnects.
The versatile four-leg setup enables match-screening, performance evaluation, and long-term stability studies under realistic operational conditions.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
Article
Chemistry, Physical
K. Cwieka, A. Lysik, T. Wejrzanowski, T. Norby, W. Xing
Summary: This paper demonstrates the influence of modifications in microstructure and chemical composition on the electrochemical behavior of cathodes for molten carbonate fuel cells (MCFCs). By designing new three-layer cathode structures, combining porous silver, nickel oxide, and nickel foam layers, it is possible to enhance cell performance, decrease internal resistance, and improve charge transfer and mass transport efficiency.
JOURNAL OF POWER SOURCES
(2021)
Article
Chemistry, Physical
Kaiqi Xu, Athanasios Chatzitakis, Paul Hoff Backe, Qiushi Ruan, Junwang Tang, Frode Rise, Magnar Bjoras, Truls Norby
Summary: This study achieved stable and efficient reduction of CO2 to formate in a bio-hybrid PEC cell using a novel cathode and efficient regeneration mechanism, approaching the efficiency of natural photosynthesis.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Vijayan Sobhana Dilimon, Ragnar Strandbakke, Truls Norby
Summary: This study investigated the impedance spectroscopy of Au electrodes on GDC-LNC composite electrolytes in O2 and O2+CO2 atmospheres. The results suggest that CO2 adsorption in O2+CO2 atmospheres hinders oxygen adsorption and slows down oxygen reduction kinetics. Incorporating LNC melt into GDC reduces polarisation resistance in O2 atmospheres, but increases it in O2+CO2 atmospheres due to the blocking adsorption of CO2.
JOURNAL OF POWER SOURCES
(2022)
Article
Chemistry, Inorganic & Nuclear
Reshma K. K. Madathil, Truls Norby
Summary: This study introduces the use of stable and highly conducting ceramic oxide as interconnects in oxide thermoelectric generators, reducing contact resistance and improving performance and durability.
SOLID STATE SCIENCES
(2022)
Article
Chemistry, Physical
Xiaolan Kang, Athanasios Chatzitakis, Thomas Aarholt, Xinwei Sun, Chiara Negri, Truls Norby
Summary: Water adsorption and surface protonic conduction on different crystal facets of nanocrystalline TiO2 have been investigated in wet atmospheres. The adsorption behavior and protonic conductivity vary significantly depending on the crystal facets. The structure of the water layers, coverage of dissociable water, and activation enthalpies for proton migration all contribute to the differences observed in surface properties.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Article
Chemistry, Multidisciplinary
Xiaolan Kang, Vilde Mari Reinertsen, Kevin Gregor Both, Augustinas Galeckas, Thomas Aarholt, Oystein Prytz, Truls Norby, Dragos Neagu, Athanasios Chatzitakis
Summary: There is a growing demand to control and enhance the stability and efficacy of nanoparticles (NPs) for photo- and electrochemical energy conversion applications. The galvanic replacement/deposition method offers a simpler and safer approach to produce a wide range of hybrid nanostructures with increased tailorability. These bimetallic nanostructures, supported on SrTiO3, show exceptional activity in plasmon-assisted photoelectrochemical water oxidation reactions.
Article
Chemistry, Multidisciplinary
Lulu Jiang, Truls Norby, Donglin Han
Summary: We investigated the proton conducting properties of doped SrZrO3 and found that it exhibits higher transport numbers and other advantages as an electrolyte in proton ceramic electrochemical cells. Through analysis of the chemical expansion properties of SrZr0.9Y0.1O3-δ (SZY10), we determined the partial conductivities of ions and electron holes, as well as the high ionic transport numbers in oxidizing atmospheres and the high electron transport numbers in reducing atmospheres. These results are explained based on defect chemistry and a brick layer model.
Article
Chemistry, Multidisciplinary
Maki Torimoto, Shuhei Ogo, Yudai Hisai, Naoya Nakano, Ayako Takahashi, Quanbao Ma, Jeong Gil Seo, Hideaki Tsuneki, Truls Norby, Yasushi Sekine
Article
Chemistry, Multidisciplinary
Yudai Hisai, Kota Murakami, Yukiko Kamite, Quanbao Ma, Einar Vollestad, Ryo Manabe, Taku Matsuda, Shuhei Ogo, Truls Norby, Yasushi Sekine
CHEMICAL COMMUNICATIONS
(2020)
