70 results on '"Puszkiel, Julián"'
Search Results
52. KNH2–KH: a metal amide–hydride solid solution
- Author
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Santoru, Antonio, primary, Pistidda, Claudio, additional, Sørby, Magnus H., additional, Chierotti, Michele R., additional, Garroni, Sebastiano, additional, Pinatel, Eugenio, additional, Karimi, Fahim, additional, Cao, Hujun, additional, Bergemann, Nils, additional, Le, Thi T., additional, Puszkiel, Julián, additional, Gobetto, Roberto, additional, Baricco, Marcello, additional, Hauback, Bjørn C., additional, Klassen, Thomas, additional, and Dornheim, Martin, additional
- Published
- 2016
- Full Text
- View/download PDF
53. Kinetic alteration of the 6Mg(NH2)2–9LiH–LiBH4 system by co-adding YCl3 and Li3N.
- Author
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Cao, Hujun, Zhang, Weijin, Pistidda, Claudio, Puszkiel, Julián, Milanese, Chiara, Santoru, Antonio, Karimi, Fahim, Castro Riglos, Maria Victoria, Gizer, Gökhan, Welter, Edmund, Bednarcik, Jozef, Etter, Martin, Chen, Ping, Klassen, Thomas, and Dornheim, Martin
- Abstract
The 6Mg(NH
2 )2 –9LiH–LiBH4 composite system has a maximum reversible hydrogen content of 4.2 wt% and a predicted dehydrogenation temperature of about 64 °C at 1 bar of H2 . However, the existence of severe kinetic barriers precludes the occurrence of de/re-hydrogenation processes at such a low temperature (H. Cao, G. Wu, Y. Zhang, Z. Xiong, J. Qiu and P. Chen, J. Mater. Chem. A, 2014, 2, 15816–15822). In this work, Li3 N and YCl3 have been chosen as co-additives for this system. These additives increase the hydrogen storage capacity and hasten the de/re-hydrogenation kinetics: a hydrogen uptake of 4.2 wt% of H2 was achieved in only 8 min under isothermal conditions at 180 °C and 85 bar of H2 pressure. The re-hydrogenation temperature, necessary for a complete absorption process, can be lowered below 90 °C by increasing the H2 pressure above 185 bar. Moreover, the results indicate that the hydrogenation capacity and absorption kinetics can be maintained roughly constant over several cycles. Low operating temperatures, together with fast absorption kinetics and good reversibility, make this system a promising on-board hydrogen storage material. The reasons for the improved de/re-hydrogenation properties are thoroughly investigated and discussed. [ABSTRACT FROM AUTHOR]- Published
- 2017
- Full Text
- View/download PDF
54. Structural and kinetic investigation of the hydride composite Ca(BH4)2 + MgH2 system doped with NbF5 for solid-state hydrogen storage
- Author
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Karimi, Fahim, primary, Klaus Pranzas, P., additional, Pistidda, Claudio, additional, Puszkiel, Julián A., additional, Milanese, Chiara, additional, Vainio, Ulla, additional, Paskevicius, Mark, additional, Emmler, Thomas, additional, Santoru, Antonio, additional, Utke, Rapee, additional, Tolkiehn, Martin, additional, Minella, Christian B., additional, Chaudhary, Anna-Lisa, additional, Boerries, Stefan, additional, Buckley, Craig E., additional, Enzo, Stefano, additional, Schreyer, Andreas, additional, Klassen, Thomas, additional, and Dornheim, Martin, additional
- Published
- 2015
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- View/download PDF
55. CARACTERIZACIÓN CINÉTICA Y TERMODINÁMICA DEL HIDRURO COMPLEJO Mg2FeH6
- Author
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Puszkiel, Julián, P. Arneodo Larochette, and F.C. Gennari
- Subjects
hidruros ,Mg-Fe-H ,almacenamiento ,molienda mecánica ,hidrógeno - Abstract
En el presente trabajo se sintetizó el hidruro complejo Mg2FeH6 por medio de la molienda mecánica (MM) en atmósfera de argón, partiendo de una mezcla de polvos de composición 2Mg-Fe, seguida de un sinterizado en condiciones de alta presión y temperatura. Los cambios estructurales, la evolución de la microestructura y el comportamiento térmico de los materiales obtenidos en las diferentes etapas de la síntesis fueron analizados empleando Difracción de Rayos X (DRX), Microscopía Electrónica de Barrido (MEB) y Calorimetría Diferencial de Barrido (CDB). Las propiedades termodinámicas fueron caracterizadas mediante las curvas de presión - composición-temperatura (PCT), utilizando un equipo volumétrico tipo Sieverts. En el proceso de absorción se observó un único plateau, que corresponde a la formación de MgH2 y Mg2FeH6, y dos plateaus durante la desorción, uno correspondiente a la descomposición del MgH2 (mayor presión) y el otro a la descomposición del Mg2FeH6 (menor presión). A partir de estas mediciones, se construyó el diagrama van’t Hoff y se calculó la entalpía y la entropía de descomposición de los hidruros. Los valores termodinámicos obtenidos fueron comparados con los de la literatura. Además se caracterizó la cinética de absorción y desorción, para analizar la dependencia de la velocidad de reacción con la temperatura y el número de ciclos de absorción- desorción.
- Published
- 2007
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56. Preparation and study of the Mg2FeH6 complex hydride for hydrogen storage (in Spanish)
- Author
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Puszkiel, Julián, F. Gennari, and P. Arneodo Larochette
- Subjects
Kinetics ,Synthesis ,Complex hydrides ,Thermodynamics ,Mg2FeH6 ,hydrogen storage - Abstract
With the increasing problems in energy supply and the growing environmental concerns of greenhouse gas emission from the burning of fossil fuels, the demand for an efficient and clean fuel alternative has increased in the recent years. Hydrogen has the best potential of becoming the fuel of the future because it is lightweight, highly abundant and its oxidation product (water) is environmentally benign. Moreover hydrogen can be produced from sustainable, renewable sources and may contribute to meet the growth in world energy demand. In spite of its potential, the efficient use of hydrogen as a fuel, compacting it for mobile applications is a key issue. Several alternatives have been investigated, such as compressed gas, condensation into liquid or chemically-bonded in solid hydrides. The last option seems to be the safest, most compact and economic alternative, but the quest of a material that gathers all the technological requirements is still unfinished. Complex hydrides are a good alternative as reversible hydrogen storage. In this group, the ternary hydride Mg2FeH6 shows the highest known volumetric hydrogen density of 150 Kg/m3 and its gravimetric hydrogen density exceeds 5 wt. %. Nevertheless, its main drawbacks are its high stability and the difficulties that its production represents. In the present work the synthesis of the complex hydride Mg2FeH6 has been first synthesized by mechanical milling from 2Mg - Fe powder under argon atmosphere followed by sintering under high pressure and temperature conditions. Afterwards, the direct synthesis of Mg2FeH6 was attempted via reactive mechanical milling from 2Mg–Fe powder under hydrogen atmosphere. The complex could be successfully produced by mechanical milling followed by sintering and the highest yield was about 50 wt. %. On the other hand, no formation of Mg2FeH6 has been observed even after log hours (265 hours) of reactive mechanical milling. Only β – MgH2 was formed. The equilibrium properties of different Mg – H - Fe systems were characterized by absorption and desorption pressure-composition-temperature curves (PCT) measured using a Sieverts - type volumetric equipment. One plateau was observed in the absorption process associated to the Mg2FeH6 formation, and two during the process of desorption, one for MgH2 decomposition and the other one for Mg2FeH6 decomposition. Enthalpy and entropy of decomposition were determined from the Van’t Hoff plot constructed with the PCT measurements. The values obtained were compared with those found in publications and books and used in the calculus. The results from the thermodynamic studies have shown that the systems characterized had a similar behavior. The kinetic of the systems were characterized by absorption and desorption kinetic curves using the same Sieverts-type volumetric equipment used for the thermodynamic characterization. The measurements were carried out to study the influence of the production method on the kinetic behavior, absorption/desorption kinetic variations as a function of temperature and the number of absorption/desorption cycles. Finally, a comparative analysis of the results obtained was carried out and the conclusions were exposed.
- Published
- 2006
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57. KNH2–KH: a metal amide–hydride solid solution.
- Author
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Santoru, Antonio, Pistidda, Claudio, Sørby, Magnus H., Chierotti, Michele R., Garroni, Sebastiano, Pinatel, Eugenio, Karimi, Fahim, Cao, Hujun, Bergemann, Nils, Le, Thi T., Puszkiel, Julián, Gobetto, Roberto, Baricco, Marcello, Hauback, Bjørn C., Klassen, Thomas, and Dornheim, Martin
- Subjects
POTASSIUM hydride ,HYDRIDES ,AMINES ,ADDITION polymerization ,NEUTRON diffraction - Abstract
We report for the first time the formation of a metal amide–hydride solid solution. The dissolution of KH into KNH
2 leads to an anionic substitution, which decreases the interaction among NH2 − ions. The rotational properties of the high temperature polymorphs of KNH2 are thereby retained down to room temperature. [ABSTRACT FROM AUTHOR]- Published
- 2016
- Full Text
- View/download PDF
58. In Situ Formation of TiB2Nanoparticles for Enhanced Dehydrogenation/Hydrogenation Reaction Kinetics of LiBH4–MgH2as a Reversible Solid-State Hydrogen Storage Composite System
- Author
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Karimi, Fahim, Riglos, María V. C., Santoru, Antonio, Hoell, Armin, Raghuwanshi, Vikram S., Milanese, Chiara, Bergemann, Nils, Pistidda, Claudio, Nolis, Pau, Baro, Maria D., Gizer, Gökhan, Le, Thi-Thu, Pranzas, P. Klaus, Dornheim, Martin, Klassen, Thomas, Schreyer, Andreas, and Puszkiel, Julián
- Abstract
To enhance the dehydrogenation/rehydrogenation kinetic behavior of the LiBH4–MgH2composite system, TiF4is used as an additive. The effect of this additive on the hydride composite system has been studied by means of laboratory and advanced synchrotron techniques. Investigations on the synthesis and mechanism upon hydrogen interaction show that the addition of TiF4to the LiBH4–MgH2composite system during the milling procedure leads to the in situ formation of well-distributed nanosized TiB2particles. These TiB2nanoparticles act as nucleation agents for the formation of MgB2upon dehydrogenation process of the hydride composite system. The effect of TiB2nanoparticles is maintained upon cycling.
- Published
- 2018
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59. Structural and kinetic investigation of the hydride composite Ca(BH4)2 + MgH2 system doped with NbF5 for solid-state hydrogen storage.
- Author
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Karimi, Fahim, Klaus Pranzas, P., Pistidda, Claudio, Puszkiel, Julián A., Milanese, Chiara, Vainio, Ulla, Paskevicius, Mark, Emmler, Thomas, Santoru, Antonio, Utke, Rapee, Tolkiehn, Martin, Minella, Christian B., Chaudhary, Anna-Lisa, Boerries, Stefan, Buckley, Craig E., Enzo, Stefano, Schreyer, Andreas, Klassen, Thomas, and Dornheim, Martin
- Abstract
Designing safe, compact and high capacity hydrogen storage systems is the key step towards introducing a pollutant free hydrogen technology into a broad field of applications. Due to the chemical bonds of hydrogen–metal atoms, metal hydrides provide high energy density in safe hydrogen storage media. Reactive hydride composites (RHCs) are a promising class of high capacity solid state hydrogen storage systems. Ca(BH
4 )2 + MgH2 with a hydrogen content of 8.4 wt% is one of the most promising members of the RHCs. However, its relatively high desorption temperature of ∼350 °C is a major drawback to meeting the requirements for practical application. In this work, by using NbF5 as an additive, the dehydrogenation temperature of this RHC was significantly decreased. To elucidate the role of NbF5 in enhancing the desorption properties of the Ca(BH4 )2 + MgH2 (Ca-RHC), a comprehensive investigation was carried out via manometric measurements, mass spectrometry, Differential Scanning Calorimetry (DSC), in situ Synchrotron Radiation-Powder X-ray Diffraction (SR-PXD), X-ray Absorption Spectroscopy (XAS), Anomalous Small-Angle X-ray Scattering (ASAXS), Scanning and Transmission Electron Microscopy (SEM, TEM) and Nuclear Magnetic Resonance (NMR) techniques. [ABSTRACT FROM AUTHOR]- Published
- 2015
- Full Text
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60. Sorption behavior of the MgH2–Mg2FeH6 hydride storage system synthesized by mechanical milling followed by sintering.
- Author
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Puszkiel, Julián, Gennari, Fabiana, Larochette, Pierre Arneodo, Karimi, Fahim, Pistidda, Claudio, Gosalawit-Utke, Rapee, Jepsen, Julian, Jensen, Torben R., Gundlach, Carsten, von Colbe, José Bellosta, Klassen, Thomas, and Dornheim, Martin
- Subjects
- *
MAGNESIUM hydride , *SORPTION , *ENERGY storage , *SINTERING , *HYDROGEN production , *MECHANICAL alloying - Abstract
Abstract: The hydrogen sorption behavior of the Mg2FeH6–MgH2 hydride system is investigated via in-situ synchrotron and laboratory powder X-ray diffraction (SR-PXD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), particle size distribution (PSD) and volumetric techniques. The Mg2FeH6–MgH2 hydride system is obtained by mechanical milling in argon atmosphere followed by sintering at high temperature and hydrogen pressure. In-situ SR-PXD results show that upon hydriding MgH2 is a precursor for Mg2FeH6 formation and remained as hydrided phase in the obtained material. Diffusion constraints preclude the further formation of Mg2FeH6. Upon dehydriding, our results suggest that MgH2 and Mg2FeH6 decompose independently in a narrow temperature range between 275 and 300 °C. Moreover, the decomposition behavior of both hydrides in the Mg2FeH6–MgH2 hydride mixture is influenced by each other via dual synergetic-destabilizing effects. The final hydriding/dehydriding products and therefore the kinetic behavior of the Mg2FeH6–MgH2 hydride system exhibits a strong dependence on the temperature and pressure conditions. [Copyright &y& Elsevier]
- Published
- 2013
- Full Text
- View/download PDF
61. Enhanced Hydrogen Storage Properties of Li-RHC System with In-House Synthesized AlTi 3 Nanoparticles.
- Author
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Le, Thi-Thu, Pistidda, Claudio, Puszkiel, Julián, Castro Riglos, María Victoria, Dreistadt, David Michael, Klassen, Thomas, and Dornheim, Martin
- Subjects
HYDROGEN storage ,DEHYDROGENATION kinetics ,NANOPARTICLES ,CATALYTIC dehydrogenation ,DEHYDROGENATION ,HYDROGENATION - Abstract
In recent years, the use of selected additives for improving the kinetic behavior of the system 2LiH + MgB
2 (Li-RHC) has been investigated. As a result, it has been reported that some additives (e.g., 3TiCl3 ·AlCl3 ), by reacting with the Li-RHC components, form nanostructured phases (e.g., AlTi3 ) possessing peculiar microstructural properties capable of enhancing the system's kinetic behavior. The effect of in-house-produced AlTi3 nanoparticles on the hydrogenation/dehydrogenation kinetics of the 2LiH + MgB2 (Li-RHC) system is explored in this work, with the aim of reaching high hydrogen storage performance. Experimental results show that the AlTi3 nanoparticles significantly improve the reaction rate of the Li-RHC system, mainly for the dehydrogenation process. The observed improvement is most likely due to the similar structural properties between AlTi3 and MgB2 phases which provide an energetically favored path for the nucleation of MgB2 . In comparison with the pristine material, the Li-RHC doped with AlTi3 nanoparticles has about a nine times faster dehydrogenation rate. The results obtained from the kinetic modeling indicate a change in the Li-RHC hydrogenation reaction mechanism in the presence of AlTi3 nanoparticles. [ABSTRACT FROM AUTHOR]- Published
- 2021
- Full Text
- View/download PDF
62. Tuning LiBH4 for Hydrogen Storage: Destabilization, Additive, and Nanoconfinement Approaches.
- Author
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Puszkiel, Julián, Gasnier, Aurelien, Amica, Guillermina, Gennari, Fabiana, and Rönnebro, Ewa C. E.
- Subjects
- *
HYDROGEN storage , *HYDROGEN as fuel , *RARE earth metals , *FOSSIL fuels , *HYDRIDES , *HYDROGEN , *THERMODYNAMICS - Abstract
Hydrogen technology has become essential to fulfill our mobile and stationary energy needs in a global low–carbon energy system. The non-renewability of fossil fuels and the increasing environmental problems caused by our fossil fuel–running economy have led to our efforts towards the application of hydrogen as an energy vector. However, the development of volumetric and gravimetric efficient hydrogen storage media is still to be addressed. LiBH4 is one of the most interesting media to store hydrogen as a compound due to its large gravimetric (18.5 wt.%) and volumetric (121 kgH2/m3) hydrogen densities. In this review, we focus on some of the main explored approaches to tune the thermodynamics and kinetics of LiBH4: (I) LiBH4 + MgH2 destabilized system, (II) metal and metal hydride added LiBH4, (III) destabilization of LiBH4 by rare-earth metal hydrides, and (IV) the nanoconfinement of LiBH4 and destabilized LiBH4 hydride systems. Thorough discussions about the reaction pathways, destabilizing and catalytic effects of metals and metal hydrides, novel synthesis processes of rare earth destabilizing agents, and all the essential aspects of nanoconfinement are led. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
63. Designing an AB2-Type Alloy (TiZr-CrMnMo) for the Hybrid Hydrogen Storage Concept
- Author
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'Puszkiel, Julián Atilio
64. Tuning LiBH4 for Hydrogen Storage: Destabilization, Additive, and Nanoconfinement Approaches
- Author
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'Puszkiel, Julián Atilio
65. 2LiBH4–MgH2–0.13TiCl4 confined in nanoporous structure of carbon aerogel scaffold for reversible hydrogen storage.
- Author
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Gosalawit-Utke, Rapee, Milanese, Chiara, Javadian, Payam, Girella, Alessandro, Laipple, Daniel, Puszkiel, Julián, Cattaneo, Alice S., Ferrara, Chiara, Wittayakhun, Jatuporn, Skibsted, Jørgen, Jensen, Torben R., Marini, Amedeo, Klassen, Thomas, and Dornheim, Martin
- Subjects
- *
LITHIUM compounds , *MAGNESIUM hydride , *TITANIUM chlorides , *NANOPOROUS materials , *CARBON , *AEROGELS , *HYDROGEN storage , *CHEMICAL structure - Abstract
Highlights: [•] Nanoconfined 2LiBH4–MgH2–0.13TiCl4 was simply prepared by solution impregnation and melt infiltration. [•] Up to two times faster desorption kinetics as compared with nanoconfined 2LiBH4–MgH2. [•] Significant low onset dehydrogenation temperature (T= 140°C). [•] New reactive phase formations during de/rehydrogenation. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
66. Nanoconfined 2LiBH4–MgH2–TiCl3 in carbon aerogel scaffold for reversible hydrogen storage
- Author
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Gosalawit-Utke, Rapee, Milanese, Chiara, Javadian, Payam, Jepsen, Julian, Laipple, Daniel, Karmi, Fahim, Puszkiel, Julián, Jensen, Torben R., Marini, Amedeo, Klassen, Thomas, and Dornheim, Martin
- Subjects
- *
LITHIUM borohydride , *MAGNESIUM hydride , *TITANIUM chlorides , *AEROGELS , *HYDROGEN storage , *DEHYDROGENATION , *BULK solids - Abstract
Abstract: Nanoconfinement of 2LiBH4–MgH2–TiCl3 in resorcinol–formaldehyde carbon aerogel scaffold (RF–CAS) for reversible hydrogen storage applications is proposed. RF–CAS is encapsulated with approximately 1.6 wt. % TiCl3 by solution impregnation technique, and it is further nanoconfined with bulk 2LiBH4–MgH2 via melt infiltration. Faster dehydrogenation kinetics is obtained after TiCl3 impregnation, for example, nanoconfined 2LiBH4–MgH2–TiCl3 requires ∼1 and 4.5 h, respectively, to release 95% of the total hydrogen content during the 1st and 2nd cycles, while nanoconfined 2LiBH4–MgH2 (∼2.5 and 7 h, respectively) and bulk material (∼23 and 22 h, respectively) take considerably longer. Moreover, 95–98.6% of the theoretical H2 storage capacity (3.6–3.75 wt. % H2) is reproduced after four hydrogen release and uptake cycles of the nanoconfined 2LiBH4–MgH2–TiCl3. The reversibility of this hydrogen storage material is confirmed by the formation of LiBH4 and MgH2 after rehydrogenation using FTIR and SR-PXD techniques, respectively. [Copyright &y& Elsevier]
- Published
- 2013
- Full Text
- View/download PDF
67. Tuning LiBH 4 for Hydrogen Storage: Destabilization, Additive, and Nanoconfinement Approaches.
- Author
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Puszkiel J, Gasnier A, Amica G, and Gennari F
- Subjects
- Catalysis, Kinetics, Magnesium Compounds chemistry, Metals chemistry, Nanostructures chemistry, Particle Size, Thermodynamics, Borohydrides chemistry, Hydrogen chemistry, Lithium Compounds chemistry
- Abstract
Hydrogen technology has become essential to fulfill our mobile and stationary energy needs in a global low-carbon energy system. The non-renewability of fossil fuels and the increasing environmental problems caused by our fossil fuel-running economy have led to our efforts towards the application of hydrogen as an energy vector. However, the development of volumetric and gravimetric efficient hydrogen storage media is still to be addressed. LiBH
4 is one of the most interesting media to store hydrogen as a compound due to its large gravimetric (18.5 wt.%) and volumetric (121 kgH2 /m3 ) hydrogen densities. In this review, we focus on some of the main explored approaches to tune the thermodynamics and kinetics of LiBH4 : (I) LiBH4 + MgH2 destabilized system, (II) metal and metal hydride added LiBH4 , (III) destabilization of LiBH4 by rare-earth metal hydrides, and (IV) the nanoconfinement of LiBH4 and destabilized LiBH4 hydride systems. Thorough discussions about the reaction pathways, destabilizing and catalytic effects of metals and metal hydrides, novel synthesis processes of rare earth destabilizing agents, and all the essential aspects of nanoconfinement are led., Competing Interests: The authors declare no conflict of interest.- Published
- 2019
- Full Text
- View/download PDF
68. CO 2 reutilization for methane production via a catalytic process promoted by hydrides.
- Author
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Grasso ML, Puszkiel J, Fernández Albanesi L, Dornheim M, Pistidda C, and Gennari FC
- Abstract
CO2 emissions have been continuously increasing during the last half of the century with a relevant impact on the planet and are the main contributor to the greenhouse effect and global warming. The development of new technologies to mitigate these emissions poses a challenge. Herein, the recycling of CO2 to produce CH4 selectively by using Mg2FeH6 and Mg2NiH4 complex hydrides as dual conversion promoters and hydrogen sources has been demonstrated. Magnesium-based metal hydrides containing Fe and Ni catalyzed the hydrogenation of CO2 and their total conversion was obtained at 400 °C after 5 h and 10 h, respectively. The complete hydrogenation of CO2 depended on the complex hydride, H2 : CO2 mol ratio, and experimental conditions: temperature and time. For both hydrides, the activation of CO2 on the metal surface and its subsequent capture resulted in the formation of MgO. Investigations on the Mg2FeH6-CO2 system indicated that the main process occurs via the reversed water-gas shift reaction (WGSR), followed by the methanation of CO in the presence of steam. In contrast, the reduction of CO2 by the Mg-based hydride in the Mg2NiH4-CO2 system has a strong contribution to the global process. Complex metal hydrides are promising dual promoter-hydrogen sources for CO2 recycling and conversion into valuable fuels such as CH4.
- Published
- 2019
- Full Text
- View/download PDF
69. Kinetic alteration of the 6Mg(NH 2 ) 2 -9LiH-LiBH 4 system by co-adding YCl 3 and Li 3 N.
- Author
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Cao H, Zhang W, Pistidda C, Puszkiel J, Milanese C, Santoru A, Karimi F, Castro Riglos MV, Gizer G, Welter E, Bednarcik J, Etter M, Chen P, Klassen T, and Dornheim M
- Abstract
The 6Mg(NH
2 )2 -9LiH-LiBH4 composite system has a maximum reversible hydrogen content of 4.2 wt% and a predicted dehydrogenation temperature of about 64 °C at 1 bar of H2 . However, the existence of severe kinetic barriers precludes the occurrence of de/re-hydrogenation processes at such a low temperature (H. Cao, G. Wu, Y. Zhang, Z. Xiong, J. Qiu and P. Chen, J. Mater. Chem. A, 2014, 2, 15816-15822). In this work, Li3 N and YCl3 have been chosen as co-additives for this system. These additives increase the hydrogen storage capacity and hasten the de/re-hydrogenation kinetics: a hydrogen uptake of 4.2 wt% of H2 was achieved in only 8 min under isothermal conditions at 180 °C and 85 bar of H2 pressure. The re-hydrogenation temperature, necessary for a complete absorption process, can be lowered below 90 °C by increasing the H2 pressure above 185 bar. Moreover, the results indicate that the hydrogenation capacity and absorption kinetics can be maintained roughly constant over several cycles. Low operating temperatures, together with fast absorption kinetics and good reversibility, make this system a promising on-board hydrogen storage material. The reasons for the improved de/re-hydrogenation properties are thoroughly investigated and discussed.- Published
- 2017
- Full Text
- View/download PDF
70. KNH 2 -KH: a metal amide-hydride solid solution.
- Author
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Santoru A, Pistidda C, Sørby MH, Chierotti MR, Garroni S, Pinatel E, Karimi F, Cao H, Bergemann N, Le TT, Puszkiel J, Gobetto R, Baricco M, Hauback BC, Klassen T, and Dornheim M
- Abstract
We report for the first time the formation of a metal amide-hydride solid solution. The dissolution of KH into KNH
2 leads to an anionic substitution, which decreases the interaction among NH2 - ions. The rotational properties of the high temperature polymorphs of KNH2 are thereby retained down to room temperature.- Published
- 2016
- Full Text
- View/download PDF
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