Article
Chemistry, Physical
A. Cousins, F. T. Zohra, E. MacA. Gray, C. J. Webb, M. Kochanek, S. Edwards, L. Schoeman
Summary: Metal hydrides are a potential method for compressing hydrogen using waste heat. They absorb low-pressure hydrogen at low temperatures and release it at a higher pressure when the temperature is raised. Achieving higher compression ratios may require multiple stages of compression. The challenge lies in finding alloy pairs that can effectively work together to achieve the desired compression. The paper evaluates the selection of 33 hydrides for hydrogen compression, but none of the potential pairs meet the compression target. Modification of parameters or alloy properties could potentially resolve this issue. Overall, the paper highlights the importance of finding suitable alloy pairs for efficient hydrogen compression.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Fangqin Guo, Toshiaki Kisaki, Ankur Jain, Hiroki Miyaoka, Kouji Sakaki, Takayuki Ichikawa
Summary: The thermochemical hydrogen compression properties and cyclic durability of titanium-iron (TiFe) alloy were investigated at various temperatures. The results showed that the TiFe alloy had stable hydrogen compression properties at temperatures below 350 degrees C, while the durability decreased at higher temperatures. Lattice strain and dislocation density of the alloy were induced during the compression cycles, leading to an increase in plateau pressure without affecting the hydrogen storage capacity. The disproportionation of TiFe into TiH2, Fe2Ti, and Ti2Fe phases reduced the hydrogen storage capacity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Dinesh Dashbabu, E. Anil Kumar, I. P. Jain
Summary: This research focuses on studying the suitability and appropriate operating conditions of aluminium based hydrides in Metal Hydride Hydrogen Compressors (MHHCs). The results indicate that hydrides with higher aluminium content can operate at lower supply pressures, while hydrides with lower aluminium content can offer higher thermal efficiency and discharge pressures at the cost of higher supply pressures.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Sruthy Balakrishnan, Terry D. Humphries, Mark Paskevicius, Craig E. Buckley
Summary: Calcium hydride has shown potential as a hydrogen storage and thermochemical energy storage material, but its high operating temperature has limited its application and research on its hydrogen sorption thermodynamics. This study provides experimental data on the thermodynamic properties and activation energy of CaH2 in both solid and molten states, filling the gap in the thermodynamics of the Ca-H system for the first time in over 60 years.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Quan Li, Zhuoya Peng, Wenbin Jiang, Liuzhang Ouyang, Hui Wang, Jiangwen Liu, Min Zhu
Summary: A series of Ti-Zr-Cr-Fe alloys have been designed for a metal hydride hydrogen compressor through orthogonal experiments. The effects of substitution and over-stoichiometry on hydrogen storage properties were investigated, with the (Ti0.85Zr0.15)(1.05)Cr1.1Fe0.9 alloy selected for its maximum storage capacity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
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
Thermodynamics
Mohammad Ranjbar Hasani, L. Garousi Farshi, Ehsanolah Assareh, Navid Nedaei
Summary: This paper evaluates three different designs of compressors in double-effect heat transformers from the perspectives of exergy and energy, comparing them with a simplified configuration. Water-LiBr is used as the working fluid in the systems. A numerical model is introduced to predict irreversibility, exergy coefficient of performance (ECOP), coefficient of performance (COP), and exergy destruction in each key component. The results show that the generator has the highest exergy destruction, accounting for around 46.06% of the total. Additionally, a decrease in absorber temperature increases the ECOP and COP. Systems utilizing water-LiBr have higher absorber outlet temperature, higher condenser temperature, and lower COP. Using a compressor in the basic design improves the absorber temperature.
APPLIED THERMAL ENGINEERING
(2023)
Article
Physics, Multidisciplinary
Mariano Lopez de Haro, Alvaro Rodriguez-Rivas
Summary: This study investigates the thermodynamic properties of the parabolic-well fluid, calculating the analytic second virial coefficient and deriving an equation of state using second-order thermodynamic perturbation theory. By comparing with simulation data, estimates of critical temperature values have been provided.
FRONTIERS IN PHYSICS
(2021)
Article
Crystallography
Nikolay V. Kozyrev, Vladimir V. Gordeev
Summary: In this study, a high-temperature equation of state for tungsten was developed using experimental data. The equation provides a good fit to the experimental data within the measurement uncertainties.
Article
Chemistry, Physical
M. Ismail
Summary: Magnesium hydride (MgH2) is a promising material for solid-state hydrogen storage due to its reversible nature and high storage capacity. However, slow kinetics and high stability have hindered its commercialization. By adding hafnium tetrachloride (HfCl4) as a catalyst, the desorption kinetics and thermodynamics of MgH2 can be improved, with the optimal enhancement observed at 15 wt% HfCl4 doping.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
N. S. C. Mazlan, F. A. Halim Yap, M. S. Yahya, S. B. Mohamed, N. A. Sazelee, N. A. Ali, I. Jusoh, M. Ismail
Summary: This study focuses on the catalytic effect of TiF3 on the hydrogen storage properties of the MgH2-Na3AlH6-LiBH4 system produced by ball milling. The addition of TiF3 catalyst results in a faster hydrogen uptake and release rate compared to the catalyst-free system. The apparent activation energy for the dissociation of Li3AlH6, MgH2, and NaBH4 in the TiF3-doped composite is significantly reduced. TiF3's catalytic performance is attributed to the in-situ production of Al-Ti and Al-F phases during the dehydrogenation process.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Materials Science, Multidisciplinary
Zhen Zhang, Renata M. Wentzcovitch
Summary: In this study, the thermodynamic properties of cubic CaPv in the Earth's lower mantle were investigated using ab initio calculations to accurately capture anharmonic effects. By calculating anharmonic phonon dispersions and free energy, various thermodynamic properties of CaPv were determined, providing insights into the thermoelastic properties of strongly anharmonic materials at high pressures and temperatures.
Article
Physics, Multidisciplinary
E. S. Eyube, J. B. Yerima, A. D. Ahmed
Summary: In this work, the radial part of the Schrödinger equation with Tietz potential was solved to obtain explicit expressions for bound state ro-vibrational energies and radial eigenfunctions, leading to results consistent with literature data. Additionally, analytical expressions for important thermodynamic relations were derived for the Tietz oscillator, providing an effective analysis method for spectroscopic data of the KI diatomic molecule.
Review
Materials Science, Multidisciplinary
Hang Yang, Zhao Ding, Yu-Ting Li, Shao-Yuan Li, Ping-Keng Wu, Quan-Hui Hou, Yang Zheng, Biao Gao, Kai-Fu Huo, Wen-Jia Du, Leon L. Shaw
Summary: Developing safer and more efficient hydrogen storage technology is crucial for the realization of the hydrogen economy. MgH2 has been extensively studied as a promising solid-state hydrogen storage material due to its lightweight, high storage density, and abundant reserves. However, practical applications have been hindered by issues such as stable thermodynamics, sluggish kinetics, and rapid capacity decay.
Article
Chemistry, Physical
Terry D. Humphries, Mark Paskevicius, Ali Alamri, Craig E. Buckley
Summary: Thermal batteries are efficient for storing renewable energies, utilizing reversible thermochemical reactions to drive a heat engine. Studies on the SrH2-2Al system have shown promising properties for high efficiency operation, which could enhance technological applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Carlos Morales, Dietmar Leinen, Eduardo Flores, Esmeralda Munoz-Cortes, Fabrice Leardini, Jose R. Ares, Jan Ingo Flege, Leonardo Soriano, Isabel J. Ferrer, Carlos Sanchez
Summary: The investigation provides new insights into the structure and chemical composition of pyrite thin films, highlighting the chemical inhomogeneities and proposing the hypothesis that the iron sulfuration process induces diffusion, resulting in the formation of a porous layer. The findings suggest that mechanisms operative in the synthesis of surface hollow structures at the nanoscale are also active in the formation of pyrite thin films.
Article
Education, Scientific Disciplines
Sergio Gonzalez-Camara, Soledad Sanz-Alferez, Maria-Isabel Orus, Jose-Ramon Ares
Summary: This article introduces a simple experimental setup that allows students to investigate the mechanism of water ascent, providing direct visualization and quantification of the process. The experimental setup, resembling real trees, offers insights into the impact of environmental and morphological parameters on the water ascension mechanism.
Article
Materials Science, Multidisciplinary
Wenliang Zhang, Qinghua Zhao, Carmen Munuera, Martin Lee, Eduardo Flores, Joao E. F. Rodrigues, Jose R. Ares, Carlos Sanchez, Javier Gainza, Herre S. J. van der Zant, Jose A. Alonso, Isabel J. Ferrer, Tao Wang, Riccardo Frisenda, Andres Castellanos-Gomez
Summary: The use of paper as a substrate for van der Waals (vdW) materials-based devices offers a promising alternative to silicon substrates in applications requiring low-cost electronic components. By fabricating films of various vdW materials on paper, it has been demonstrated that this technique shows great potential for producing electronic devices with high optical quality and exceptionally low electrical resistivity.
APPLIED MATERIALS TODAY
(2021)
Review
Green & Sustainable Science & Technology
Olga Caballero-Calero, Jose R. Ares, Marisol Martin-Gonzalez
Summary: This review article provides an overview of recent research directions in eco-friendly, non-toxic, and earth-abundant thermoelectric materials, showing their potential as an excellent alternative for producing cost-effective, sustainable, and non-toxic thermoelectric generators.
ADVANCED SUSTAINABLE SYSTEMS
(2021)
Article
Chemistry, Physical
Carlos Morales, Dietmar Leinen, Adolfo del Campo, Jose Ramon Ares, Carlos Sanchez, Jan Ingo Flege, Alejandro Gutierrez, Pilar Prieto, Leonardo Soriano
Summary: ZnO thin films were grown by e-beam evaporation at low temperatures on Al2O3 and Si substrates, with no significant differences observed between the two substrates. The growth mode of ZnO at low temperatures was found to be a gradual bilayer system, with the emergence of Zn-rich whiskers at extremely low temperatures. These results provide a promising route to enhance the properties of ZnO films below the typical high temperature window.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Nuria Jimenez-Arevalo, Eduardo Flores, Alessio Giampietri, Marco Sbroscia, Maria Grazia Betti, Carlo Mariani, Jose R. Ares, Isabel J. Ferrer, Fabrice Leardini
Summary: The study investigated heterostructures formed by ultrathin borocarbonitride (BCN) layers grown on TiO2 nanoribbons as photoanodes for photoelectrochemical water splitting. Various analytical techniques were used to characterize the structure and chemical composition of different materials, revealing that TiO2-BCN heterostructures displayed improved performance in a photoelectrochemical cell.
Article
Chemistry, Physical
Carlos Morales, Antonio Pascual, Dietmar Leinen, Eduardo Flores, Esmeralda Munoz-Cortes, Fabrice Leardini, Jose R. Ares, Jan Ingo Flege, Leonardo Soriano, Isabel J. Ferrer, Carlos Sanchez
Summary: This study presents a reaction and kinetic model of the sulfuration reaction of metallic iron thin films into monosulfides. The evolution of the transport properties of the films during their sulfuration reaction was observed by slowing down the reaction. The study reveals that the sulfuration reaction involves two stages, including the transformation of iron into hexagonal pyrrhotite and a partial crystallization of pyrrhotite into ortho-rhombic pyrrhotite.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Esmeralda Munoz-Cortes, Olga L. Ibryaeva, Miguel Manso Silvan, Borja Zabala, Eduardo Flores, Almudena Gutierrez, Jose Ramon Ares, Roman Nevshupa
Summary: This study explored the application of mechanical energy as a non-thermal method to drive hydrogen emission from undoped sodium alanate at room temperature. The results showed that mild rubbing of NaAlH4 pellets under vacuum led to intensive and instantaneous gas emission, with hydrogen being the dominant species. The emission process involved multiple first-order reactions with widely ranged time constants. It was suggested that the tribochemical reactions can be triggered by plastic deformation and shearing. A linked diffusion-wear model of NaAlH4 triboinduced dehydrogenation was proposed to explain the empirical findings.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Carlos Morales, Antonio Pascual, Dietmar Leinen, Eduardo Flores, Esmeralda Munoz-Cortes, Fabrice Leardini, Jose R. Ares, Jan Ingo Flege, Leonardo Soriano, Isabel J. Ferrer, Carlos Sanchez
Summary: This study presents a reaction and kinetic model of the sulfuration reaction of metallic iron thin films into monosulfides. The observation of two stages in the sulfuration process and the explanation of the changes in electrical resistance and Seebeck coefficient of the Fe film provide insights into the transformation process.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Review
Energy & Fuels
Luca Pasquini, Kouji Sakaki, Etsuo Akiba, Mark D. Allendorf, Ebert Alvares, Jose R. Ares, Dotan Babai, Marcello Baricco, Jose Bellosta von Colbe, Matvey Bereznitsky, Craig E. Buckley, Young Whan Cho, Fermin Cuevas, Patricia de Rango, Erika Michela Dematteis, Roman V. Denys, Martin Dornheim, J. F. Fernandez, Arif Hariyadi, Bjrn C. Hauback, Tae Wook Heo, Michael Hirscher, Terry D. Humphries, Jacques Huot, Isaac Jacob, Torben R. Jensen, Paul Jerabek, Shin Young Kang, Nathan Keilbart, Hyunjeong Kim, Michel Latroche, F. Leardini, Haiwen Li, Sanliang Ling, Mykhaylo V. Lototskyy, Ryan Mullen, Shin-ichi Orimo, Mark Paskevicius, Claudio Pistidda, Marek Polanski, Julian Puszkiel, Eugen Rabkin, Martin Sahlberg, Sabrina Sartori, Archa Santhosh, Toyoto Sato, Roni Z. Shneck, Magnus H. Sorby, Yuanyuan Shang, Vitalie Stavila, Jin-Yoo Suh, Suwarno Suwarno, Le Thi Thu, Liwen F. Wan, Colin J. Webb, Matthew Witman, ChuBin Wan, Brandon C. Wood, Volodymyr A. Yartys
Summary: This review summarizes the latest research progress on hydrides based on magnesium and intermetallic compounds for energy storage. It covers topics such as hydrogen sorption mechanisms, synthesis and processing techniques, catalysts, and the development of new compounds. The article highlights the important role of these hydrides in the clean energy transition and the deployment of hydrogen as an energy vector.
PROGRESS IN ENERGY
(2022)
Article
Energy & Fuels
A. R. E. Galvis, F. Leardini, J. R. Ares, F. Cuevas, J. F. Fernandez
JOURNAL OF PHYSICS-ENERGY
(2020)
