Article
Chemistry, Multidisciplinary
Yasukazu Kobayashi, Tomota Nagaura, Azhar Alowasheeir, Shohei Tada, Yusuke Yamauchi
Summary: CsCl-type intermetallic compounds TiM (M=Co, Fe) with nanoscale layered structures were obtained by deoxidizing MTiO3 with CaH2 at 600 degrees C. The formation of Li2TiO3-like intermediate helped maintain the layered structure during deoxidation.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Yasukazu Kobayashi, Tomota Nagaura, Azhar Alowasheeir, Shohei Tada, Yamauchi Yusuke
Summary: CsCl-type intermetallic compounds TiM (M=Co, Fe) were obtained by deoxidizing trigonal ilmenite-type MTiO3 with a reducing agent CaH2 in molten LiCl at 600 degrees C. The formation of nanoscale layered structures and the substitution of M in MTiO3 by Li from the molten LiCl were revealed by various analyses. The presence of Li2TiO3-like intermediate compound helped maintain the original layered structure during deoxidation and alloying at low temperatures.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
V. N. Fokin, P. V. Fursikov, E. E. Fokina, B. P. Tarasov
Summary: By adding the Mg2Ni intermetallic compound to a mechanical mixture of magnesium powder, high-purity magnesium hydride can be achieved at relatively low temperatures and high pressures, without the need for high-energy preactivation. The mixture releases high-purity hydrogen suitable for laboratory and small-scale work in high-temperature metal hydride hydrogen accumulators.
INORGANIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
J. F. Zhao, H. P. Wang, B. Wei
Summary: A new thermodynamically stable Nb2Ni intermetallic compound has been discovered in the Nb-Ni binary system, refreshing the current equilibrium phase diagram. Experimental verification confirmed the structure and properties of this new phase.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Jussara Barale, Federico Nastro, Davide Violi, Paola Rizzi, Carlo Luetto, Marcello Baricco
Summary: This study comprehensively presents the on-site compression of green hydrogen using metal hydrides, including the setup of a metal hydride compressor and the energy consumption and efficiency considerations. The compressor achieves compression of hydrogen from 28 bar to 250 bar, with high isentropic efficiency and average hydrogen flowrate.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Jussara Barale, Jose Ramon Ares, Paola Rizzi, Marcello Baricco, Jose Francisco Fernandez Rios
Summary: To replace mechanical compressors in hydrogen infrastructures, new compositions are needed to achieve a pressure of 700 bar. This study synthesized and characterized Ti1.1(Cr,Mn,V)2 and Ti1.1(Cr,Mn,V,Fe)2 compositions based on Laves (C14) intermetallic compounds, which show increased plateau pressure and hysteresis gap due to the substitution of Cr with Mn and Fe. These alloys have suitable thermodynamics for high-pressure hydrogen compression, easy activation at room temperature, and fast reaction rates. The most promising composition, Ti1.1Cr0.9Mn0.8V0.1Fe0.2, is estimated to release hydrogen at 700 bar and 150 degrees C. The integration of these alloys in a metal hydride compressor is evaluated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Physics, Multidisciplinary
Xiao Zhang
Summary: Using Raman spectroscopy, the chemical reaction products of elemental sulfur, selenium, and molecular hydrogen at high pressures and room temperature were investigated. Various compounds were synthesized, including H2S, H2Se, and a van der Waals compound with a guest-host structure. The study revealed the pressure dependence and stability of different molecules within these compounds.
Article
Multidisciplinary Sciences
Xue Ming, Ying-Jie Zhang, Xiyu Zhu, Qing Li, Chengping He, Yuecong Liu, Tianheng Huang, Gan Liu, Bo Zheng, Huan Yang, Jian Sun, Xiaoxiang Xi, Hai-Hu Wen
Summary: Researchers synthesized nitrogen-doped lutetium hydride and found no evidence of low-temperature superconductivity at ambient pressure.
Article
Chemistry, Physical
Charlotte Croise, Khaled Alabd, Sophie Tence, Etienne Gaudin, Antoine Villesuzanne, Xavier Courtois, Nicolas Bion, Fabien Can
Summary: This study investigates the influence of rare-earth (R) element in Ru/RScSi electride-like intermetallic catalysts for ammonia synthesis under mild conditions. The catalytic performances follow the lanthanides series and appear correlated with the formation of the hydride phase. Ru-1.7/CeScSi shows remarkable catalytic activity associated with its reversible hydrogen storage-release properties. It is suggested that NHX formation could be the rate determining step rather than the N-2 cleavage over these catalysts.
Article
Chemistry, Physical
Tomoaki Takayama, Mitsuki Sakai, Seiji Yamazoe, Takayuki Komatsu
Summary: The study reveals that alloyed PdIn nanoparticles are electrocatalysts that can achieve artificial photosynthetic CO2 reduction using renewable energy. The combination of PdIn/KB electrocatalyst with a CoOx-loaded BiVO4:Mo photoanode in an aqueous electrolyte demonstrates successful CO2 reduction under simulated solar light. PdIn nanoparticles exhibit both high activity for CO2 reduction and durability against CO poisoning.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Crystallography
Galina Politova, Irina Tereshina, Ioulia Ovchenkova, Abdu-Rahman Aleroev, Yurii Koshkid'ko, Jacek Cwik, Henryk Drulis
Summary: In this study, the magnetocaloric effect in the TbCo2-H system near the Curie temperature was investigated using direct and indirect methods. The magnetic and magnetothermal properties of TbCo2-H with high hydrogen content were examined, and the mechanisms responsible for the change in the Curie temperature were established. The field and temperature dependences of the magnetocaloric effect were analyzed, and the magnetocaloric properties of various systems based on TbCo2 compound were compared. The regularities of the change in the MCE value and the Curie temperature depending on the composition were discovered and discussed.
Article
Metallurgy & Metallurgical Engineering
Miao Chen, Wu Qin, Yixuan Hu, Yiren Wang, Yong Jiang, Xiaosong Zhou, Shuming Peng, Yibei Fu
Summary: This study used first-principles calculations to investigate the hydrogenation of Zr and its alloys, revealing the presence of different stable phase structures for ZrHx under various temperatures and pressures. Additionally, thermodynamically stable and metastable phase stability diagrams were constructed to predict the formation of ZrH(x) during hydrogenation, which may be influenced by the environment.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2021)
Article
Chemistry, Inorganic & Nuclear
Khrystyna Miliyanchuk, Silvie Maskova-Cerna, Ladislav Havela, Nazar Saidov, Yaroslav Tokaychuk, Milan Dopita, Roman Gladyshevskii
Summary: Hydrogenation effects on the crystal structures and magnetic properties of Tb2Co2Ga, Tb2Co2Ga, and Tb3Co3Ga were studied, revealing that hydrogenation leads to lattice volume expansion, decrease of Curie temperature, and suppression of antiferromagnetic ordering. Tb2Ni2Ga acts as a typical 4f-electron system with dominating RKKY exchange interactions.
JOURNAL OF SOLID STATE CHEMISTRY
(2021)
Article
Chemistry, Physical
I. S. Tereshina, S. V. Veselova, V. N. Verbetsky, M. A. Paukov, D. Gorbunov, E. A. Tereshina-Chitrova
Summary: The structural and magnetic properties of (R,R')(2) Fe-17-type compounds and (R,R')(2) Fe17Hy hydrides have been studied, with hydrides showing increased unit cell size and Curie temperature. Hydrides with high hydrogen concentration are obtained by direct hydrogen absorption by the intermetallics. Strong magnetic fields induce phase transitions in compounds with a high content of heavy rare earth elements.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Thermodynamics
D. Sergeev, E. K. Simanjuntak, M. Ziegner, M. Mueller
Summary: The thermodynamic properties of the intermediate compound KCaCl(NO3)2 are crucial for understanding the KCl-CaCl2-KNO3-Ca(NO3)2 reciprocal system and its applications in thermal energy storage. X-ray diffraction analysis confirmed the formation of KCaCl(NO3)2 as an intermediate compound in this system, along with other crystalline phases. Kinetic effects were observed, with the enthalpy of fusion depending on the cooling rate and the ratio of crystallized phases. The heat capacity and enthalpy increment of KCaCl(NO3)2 in solid and liquid phases were determined, and the obtained data was confirmed to be reliable.
CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY
(2023)
