Demonstration of Mg2FeH6 as heat storage material at temperatures up to 550 °C

Urbanczyk, Robert; Meggouh, Mariem; Moury, Romain; Peinecke, Kateryna; Peil, Stefan; Felderhoff, Michael

doi:10.1007/s00339-016-9811-6

Cited by 35 publications

(20 citation statements)

References 14 publications

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“…Complex hydrides with suitable range of operating pressures and temperatures are promising for this application 103a,116. Although there are a few issues, such as corrosion problem at high temperatures and high hydrogen pressures, need to be addressed, some thermal storage systems have been demonstrated in a scale unit of several kilograms of hydrides, showing clear practical potential 100b,117…”

Section: Thermal Energy Storagementioning

confidence: 99%

“…Although no material could meet all the DOE targets for onboard application, a few intensively investigated systems, such as NaAlH 4 , Mg(NH 2 ) 2 ‐2LiH and LiBH 4 ‐MgH 2 , possess suitable hydrogen capacities and thermodynamic properties, and show practical potential 56d,176. Some prototypes of hydrogen storage tanks 37c,56d,177 and thermal energy storage systems 100b,117 have been built. Comparatively, less effort was given to organic hydrogenous compounds albeit there are a large number of candidates there which, in principle, can undergo hydrogenation and dehydrogenation via forming or breaking CH bonds.…”

Section: Perspectivementioning

confidence: 99%

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Complex Hydrides for Energy Storage, Conversion, and Utilization

2019

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functionalities and exhibit great potentials for the applications in the energy transfer chain (Figure 1).In chemistry, a hydride is a compound having negatively charged hydrogen anion. [2] Nowadays, however, hydrogenous compounds having hydrogen bonded to metals or nonmetal in ionic, metallic or covalent manner are collectively referred as hydrides. [3] Complex hydride is such a class of compound having a general formula of M(XH n ) m , where M is usually a metal cation and X is a metal or nonmetal element which sets up covalent or ionocovalent bonding with H. [4] The M[XH n ] m is H-rich and can decompose selectively to H 2 allowing complex hydrides of light-weight elements potential hydrogen storage media. As a matter of fact, since the pioneering work of Ti-catalyzed NaAlH 4 in 1997, [5] extensive investigations on hydrogen storage over alanates, [6] amide-hydride composites, [7] borohydrides, [8] amidoboranes [9] as well as metallorganic hydrides [10] were carried out and tremendous progress has been made (Figure 2). [1,4a] The break and setup of XH bonding would be endergonic and exergonic, respectively. The energy input and output in hydrogen desorption and reabsorption over a complex hydride depends strongly on its thermodynamic stability, which also offers an opportunity of using complex hydrides as thermal energy storage materials to cope up with the intermittent, fluctuating and unstable supply of renewable energies. Owning to their exclusive advantages of diversity, high energy densities and tunability, complex hydrides have been actively pursued for this application since year 2000. [11] Solid electrolytes with fast conduction of Li, Na, or Mg ions are highly demanded for all-solid-state batteries with high energy density and safety. Coincidentally, complex hydrides are composed of those cations and a relatively large sized [XH n ] anion. The coordination flexibility of the large anion with alkali or alkaline earth cation would create some favorable structural features, such as defects and/or low-barrier diffusion channels, to facilitate cation migration within the lattice of complex hydrides. [12] Starting from the finding of high Li-ion conduction in the high-temperature-phase LiBH 4 , [13] a variety of complex hydrides has been developed, some of which show superior ion conductivity to their nonhydride peers. [14] Hydrogen storage over complex hydride would undergo dihydrogen dissociation into surface H atoms followed by H Functional materials are the key enabling factor in the development of clean energy technologies. Materials of particular interest, which are reviewed herein, are a class of hydrogenous compound having the general formula of M(XH n ) m , where M is usually a metal cation and X can be Al, B, C, N, O, transition metal (TM), or a mixture of them, which sets up an iono-covalent or covalent bonding with H. M(XH n ) m is generally termed as a complex hydride by the hydrogen storage community. The rich chemistry between H and B/C/N/O/Al/TM allows complex hydrides of diverse compo...

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Section: Thermal Energy Storagementioning

confidence: 99%

Section: Perspectivementioning

confidence: 99%

Complex Hydrides for Energy Storage, Conversion, and Utilization

2019

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“…The high value of ∆H hydr makes Mg 2 FeH 6 a suitable material for heat storage at relatively high temperatures (up to 550 • C) [11][12][13]. Indeed, during the discharge of hydrogen, the material absorbs heat, while the released H 2 can be stored for further use.…”

Section: Of 14mentioning

confidence: 99%

“…Conversely, during hydrogen recharging, the stored heat can be used to generate electricity [10]. This process can be useful to compensate for fluctuations in the production from renewable energy sources, such as solar power plants [11]. Finally, magnesium iron hydride was proposed as an innovative negative electrode material for lithium batteries.…”

Section: Of 14mentioning

confidence: 99%

Extremely Pure Mg2FeH6 as a Negative Electrode for Lithium Batteries

et al. 2018

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Nanocrystalline samples of Mg-Fe-H were synthesized by mixing of MgH2 and Fe in a 2:1 molar ratio by hand grinding (MIX) or by reactive ball milling (RBM) in a high-pressure vial. Hydrogenation procedures were performed at various temperatures in order to promote the full conversion to Mg2FeH6. Pure Mg2FeH6 was obtained only for the RBM material cycled at 485 °C. This extremely pure Mg2FeH6 sample was investigated as an anode for lithium batteries. The reversible electrochemical lithium incorporation and de-incorporation reactions were analyzed in view of thermodynamic evaluations, potentiodynamic cycling with galvanostatic acceleration (PCGA), and ex situ X-ray Diffraction (XRD) tests. The Mg2FeH6 phase underwent a conversion reaction; the Mg metal produced in this reaction was alloyed upon further reduction. The back conversion reaction in a lithium cell was here demonstrated for the first time in a stoichiometric extremely pure Mg2FeH6 phase: the reversibility of the overall conversion process was only partial with an overall coulombic yield of 17% under quasi-thermodynamic control. Ex situ XRD analysis highlighted that the material after a full discharge/charge in a lithium cell was strongly amorphized. Under galvanostatic cycling at C/20, C/5 and 1 C, the Mg2FeH6 electrodes were able to supply a reversible capacity with increasing coulombic efficiency and decreasing specific capacity as the current rate increased.

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“…Recent years have seen a resurgence of interest into the synthesis and characterisation of complex metal hydrides [1][2][3] and complex transition metal hydrides (CTMH). [4][5][6] Their thermal stability and hydrogen storage capacity have made this class of materials applicable for implementation as hydrogen storage materials, thermal energy storage (TES) materials [7][8][9] and possibly as neutron moderators or nuclear fuel components in nuclear reactors. 10 Furthermore, the rich and diverse chemistry made possible by the variety of cations (i.e.…”

Section: Introductionmentioning

confidence: 99%