Li?H2 cells with molten alkali chlorides electrolyte

Ito, Hiroshi; Hasegawa, Yasuo; Ito, Yasuhiko

doi:10.1007/s10800-005-0938-y

Cited by 6 publications

(3 citation statements)

References 18 publications

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“…Furthermore, the large negative redox potential of H 2 /H − (−2.2 V with respect to H + /H 2 (SHE) and 0.3–0.5 V with respect to Li + /Li (ref. 13)) may not only be useful for employing H − as a reductant in organic and electrochemical reactions14 but may also facilitate redox reactions inside materials containing H − ions. An example of the latter has been reported for H − ion-doped mayenite151617181920212223242526, in which H − ions are photochemically converted to protons by releasing carrier electrons151617.…”

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confidence: 99%

Hydride ions in oxide hosts hidden by hydroxide ions

et al. 2014

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The true oxidation state of formally ‘H−’ ions incorporated in an oxide host is frequently discussed in connection with chemical shifts of 1H nuclear magnetic resonance spectroscopy, as they can exhibit values typically attributed to H+. Here we systematically investigate the link between geometrical structure and chemical shift of H− ions in an oxide host, mayenite, with a combination of experimental and ab initio approaches, in an attempt to resolve this issue. We demonstrate that the electron density near the hydrogen nucleus in an OH− ion (formally H+ state) exceeds that in an H− ion. This behaviour is the opposite to that expected from formal valences. We deduce a relationship between the chemical shift of H− and the distance from the H− ion to the coordinating electropositive cation. This relationship is pivotal for resolving H− species that are masked by various states of H+ ions.

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confidence: 99%

Hydride ions in oxide hosts hidden by hydroxide ions

et al. 2014

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“…In previous works from our group, − the hydrogen desorption of Mg(BH 4 ) 2 is significantly enhanced by the doping of CNTs due to reducing the strength of the B–H bond. Meanwhile, nickel can effectively decompose and recombine hydrogen in borohydride materials. , In this paper, the Mg(BH 4 ) 2 - x wt% Ni/MWCNTs composites were synthesized by being used as additives. The combination of Ni and MWCNTs has a superb synergistic catalytic effect than that of any single catalyst on the dehydrogenation of Mg(BH 4 ) 2 .…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, nickel can effectively decompose and recombine hydrogen in borohydride materials. 43,44 In this paper, the Mg(BH 4 ) 2 -xwt% Ni/MWCNTs composites were synthesized by being used as additives. The combination of Ni and MWCNTs has a superb synergistic catalytic effect than that of any single catalyst on the dehydrogenation of Mg(BH 4 ) 2 .…”

Section: Introductionmentioning

confidence: 99%

Ni-Doped Carbon Nanotube-Mg(BH₄)₂ Composites for Hydrogen Storage

Yuan

Huang

Jiang

et al. 2021

ACS Appl. Nano Mater.

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Borohydride magnesium is widely studied as a promising hydrogen storage material due to its high gravimetric and volumetric density (14.9 wt % and 112 g/L, respectively). Different types of catalysts play a good catalytic role in enhancing the hydrogen desorption rates in borohydride systems. In the present paper, multiwalled carbon nanotubes supported Ni (Ni/ MWCNTs) were synthesized by a chemical reduction method, and the catalyst was introduced into Mg(BH 4 ) 2 to enhance the dehydrogenation kinetics. The effect of Ni/MWCNTs on the microstructural evolution and hydrogen storage properties of Mg(BH 4 ) 2 is studied. The Mg(BH 4 ) 2 -5wt% Ni/MWCNTs (95M@5NiMWCNTs) sample exhibits the best hydrogen storage performance; it starts to release hydrogen at 93 °C, which is 113 °C lower than that of the primary Mg(BH 4 ) 2 sample. Moreover, it takes only 3600 s to desorb hydrogen completely at 300 °C, showing a significant improvement on hydrogen desorption kinetics. In comparison with the primary Mg(BH 4 ) 2 sample, the dehydriding apparent activation energy of the 95M@5Ni 3 MWCNTs 2 sample is significantly lowered to 119.5 kJ mol −1 . Transmission electron microscopy analysis exhibits that the striking improvement of dehydriding properties of Mg(BH 4 ) 2 is mainly due to the synergistic catalysis of Ni and MWCNTs. This work provides a new method for designing and synthesizing high-performance catalysts in borohydride hydrogen storage materials, which is potentially utilized as a hydrogen supplier for hydrogen fuel cells.

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Applications of Lithium‐Containing Hydrides for Energy Storage and Conversion

Wietelmann

2014

Chemie Ingenieur Technik

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Lithium-containing hydrides and some derivatives are mainly used in synthetic chemistry for the selective reduction of functional groups. Hydrogen storage applications of complex Li hydrides and reactive mixtures with other metal hydrides or amides have been investigated thoroughly, but practical applications are hampered due to limited reversibility and unfavorable conditions for the sorption and desorption of hydrogen. In the field of electrochemical energy storage, complex Li-containing hydrides are investigated as Li-ion-conducting materials and as active materials for anodes of nonaqueous batteries.

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Li?H2 cells with molten alkali chlorides electrolyte

Cited by 6 publications

References 18 publications

Hydride ions in oxide hosts hidden by hydroxide ions

Hydride ions in oxide hosts hidden by hydroxide ions

Ni-Doped Carbon Nanotube-Mg(BH₄)₂ Composites for Hydrogen Storage

Applications of Lithium‐Containing Hydrides for Energy Storage and Conversion

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Li?H2 cells with molten alkali chlorides electrolyte

Cited by 6 publications

References 18 publications

Hydride ions in oxide hosts hidden by hydroxide ions

Hydride ions in oxide hosts hidden by hydroxide ions

Ni-Doped Carbon Nanotube-Mg(BH4)2 Composites for Hydrogen Storage

Applications of Lithium‐Containing Hydrides for Energy Storage and Conversion

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Product

Resources

About

Ni-Doped Carbon Nanotube-Mg(BH₄)₂ Composites for Hydrogen Storage