Corrigendum to “Hydrogen storage property of MgH2 synthesized by hydriding chemical vapor deposition” [J. Alloys Compd. 446–447 (2007) 80–83]

Saita, Itoko; Toshima, Takeshi; Tanda, Satoshi; Akiyama, Tomohiro

doi:10.1016/j.jallcom.2009.04.001

Cited by 8 publications

(18 citation statements)

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“…In a scanning electron microscopy (SEM) image from a previous study, the air-exposed fiber appeared in uniformly white contrast 17) or in black-and-white contrast like zebra stripes. 22) The white fiber and the white part of the fiber are considered to be Mg crystals in an oxide tube, as observed in this study.…”

Section: Resultsmentioning

confidence: 92%

“…17,18,22) The MgH 2 fiber reversibly desorbed and absorbed hydrogen with a higher reaction rate than conventional bulk Mg did. 17,18,22) The pressure-composition (PC) isotherm of the MgH 2 fiber showed a hydrogen absorption pressure (P eq,fiber ) of 1.3 MPa at 578 K. 17,18,22) This pressure was higher than both the CVD condition to produce MgH 2 (P CVD ) and the absorption pressure for bulk Mg (P eq,bulk ) at the same temperature, which were 0.4 MPa 23) and 0.2 MPa, 24) respectively. While the difference between P CVD and P eq,bulk can be regarded as a deviation of the CVD process from the equilibrium state, the difference between P eq,fiber and P eq,bulk , both measured at the equilibrium state, has a different explanation.…”

Section: Introductionmentioning

confidence: 98%

“…The MgH 2 synthesized by CVD consists of irregularly curving fiber and straight fiber of a single crystal with a diameter of several hundreds of nanometers and a length of several micrometers. [16][17][18] Such single crystal fiber of MgH 2 has also been obtained incidentally by a vaporliquid-solid (VLS) or vapor-solid (VS) process during hydrogen absorption and desorption cycles of Mg 19,20) or Mg-based alloys, 21) but the hydrogen storage properties of those fibers have not been measured because of the difficulty of separating the fiber from the base materials. Since the CVD method produces MgH 2 fiber separately from the Mg, it makes it possible to investigate the hydrogen storage properties of the MgH 2 fiber.…”

Section: Introductionmentioning

confidence: 99%

“…Since the MgH 2 fibers in previous studies were exposed to air before analysis, 17,18,22) it is possible that surface oxidation affected the hydrogen storage properties. In order to discuss the high hydrogen absorption pressure of the MgH 2 fiber, knowledge of the inherent hydrogen storage property without surface oxidation is essential.…”

Section: Introductionmentioning

confidence: 99%

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Decomposition of Magnesium Hydride Fiber Observed Using TEM and <I>In-Situ</I> AFM

et al. 2011

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The thermodynamics and the decomposition behavior of an MgH 2 fiber of a single crystal synthesized by chemical vapor deposition were investigated using in-situ atomic force microscopy and transmission electron microscopy. The MgH 2 fiber without oxidation decomposed into polycrystalline Mg with a crystalline size of 20-50 nm. The polycrystalline Mg absorbed hydrogen at a pressure similar to the equilibrium pressure of bulk Mg. On the other hand, the MgH 2 fiber with surface oxidation decomposed into Mg crystals larger than 100 nm. The surface oxide layer affected the decomposition behavior of the MgH 2 fiber and prevented polycrystallization. These results suggest that surface oxidation increases the equilibrium pressure for hydrogen absorption of the MgH 2 fiber.

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Section: Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Decomposition of Magnesium Hydride Fiber Observed Using TEM and <I>In-Situ</I> AFM

et al. 2011

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“…Recently, several authors have reported first results on the hydrogen sorption properties of magnesium (hydride) nanostructures with different shapes, such as wires, platelets and spheres grown from the vapor phase [65][66][67]. In general, the hydrogen sorption kinetics were very fast compared to bulk, non-catalyzed magne- sium (hydride), and no activation cycles were needed.…”

Section: Ionic Hydrides Focussing On Magnesium Hydridementioning

confidence: 99%

Nanoparticles and 3D Supported Nanomaterials

Jongh

Adelhelm

2010

Handbook of Hydrogen Storage

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Many light metal hydride systems are discussed in this book. However, none of them is currently able to meet all the demands for practical on-board hydrogen storage: high volumetric and gravimetric density, reasonably high hydrogen equilibrium pressure at room-or fuel cell operating-temperature, fast kinetics for both loading and unloading and ample reversibility. A variety of strategies is being pursued to meet these goals: ball-milling to improve the kinetics and add catalysts, searching for new yet unknown material compositions, and mixing several different compounds (reactive hydride composites or destabilized hydrides) [1-6]. Some approaches are remarkably successful, such as ball-milling in general to improve the kinetics [2,3], and the addition of a small amount of a Ti-based catalyst to improve the kinetics of both hydrogenation and dehydrogenation of NaAlH 4 [1]. However although steady progress is reported, we are still far from meeting simultaneously all criteria for on-board storage.In this chapter we discuss an alternative approach: altering the properties of a given material by nanosizing and/or supporting the material. Although this approach is relatively new for hydrogen storage applications, it has been known for a long time in other fields such as heterogeneous catalysis, where a high surface/volume ratio is essential. Interesting material classes are unsupported clusters, nanoparticles and nanostructures, and 3D supported (or scaffolded) nanomaterials. In general the crystallite size of the materials discussed is below 10 nm. This is a clear distinction from materials prepared by ball-milling, presently the most common processing technique, by which crystallite sizes of 10-30 nm or above (depending on the material) are achieved. Furthermore, in general (though not always) the alternative preparation techniques used to obtain these nanosized materials (gas-phase deposition, melt infiltration, or solution-based synthesis techniques) allow a much better Handbook of Hydrogen Storage. Edited by Michael Hirscher

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A Free Cyanohydrin as Arms and Armour of Marasmius oreades

Caspar

Spiteller

2015

ChemBioChem

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Cyanogenic plants and fungi are widespread in nature. Although the origin of hydrocyanic acid in plants has been studied in detail, little is known about its origin in fungi. Here, we report the identification of the cyanohydrin of glyoxylic acid as the precursor of hydrocyanic acid in the fungus Marasmius oreades and several other cyanogenic fungi. Moreover, a feeding experiment revealed glycine as biosynthetic precursor of the cyanohydrin of glyoxylic acid. Thus, the cyanogenesis of M. oreades and other fungi is fundamentally different from cyanogenesis in plants.

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Corrigendum to “Hydrogen storage property of MgH2 synthesized by hydriding chemical vapor deposition” [J. Alloys Compd. 446–447 (2007) 80–83]

Cited by 8 publications

References 0 publications

Decomposition of Magnesium Hydride Fiber Observed Using TEM and <I>In-Situ</I> AFM

Decomposition of Magnesium Hydride Fiber Observed Using TEM and <I>In-Situ</I> AFM

Nanoparticles and 3D Supported Nanomaterials

A Free Cyanohydrin as Arms and Armour of Marasmius oreades

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