Remarkable Hydrogen Storage, Structural and Optical Properties in Multi-layered Pd/Mg Thin Films

Fujii, H.; Higuchi, Kei; Yamamoto, Kenichi; Kajioka, H.; Orimo, Shin Ichi; Toiyama, Kiyokazu

doi:10.2320/matertrans.43.2721

Cited by 48 publications

(25 citation statements)

References 15 publications

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“…Multi-layered Pd/Mg films prepared by RF-sputtering display remarkable hydrogen storage properties (5 wt.% in Mg at 373 K and 0.1 MPa) due to cooperative phenomena in nano-composite interface regions between the Pd and Mg layers [1][2][3]. We report hereafter the structural and electrochemical hydriding properties of nanostructured PdMg films synthesized by means of pulsed laser deposition (PLD).…”

Section: Introductionmentioning

confidence: 98%

Hydrogen electrosorption and structural properties of nanostructured Pd–Mg thin films elaborated by pulsed laser deposition

Paillier

Roué

2005

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 98%

Hydrogen electrosorption and structural properties of nanostructured Pd–Mg thin films elaborated by pulsed laser deposition

Paillier

Roué

2005

Journal of Alloys and Compounds

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“…This confirms that MgH 2 is applicable for practical use if we can modify bulk MgH 2 into suitable nano-structure. 84,85) Prior to the studies of catalytic effect on H-storage properties of MgH 2 , we examined the correlation between H-storage properties and structural characteristics in mechanically milled magnesium hydride MgH 2 itself.…”

Section: Hydrogen Storage Properties Of Magnesium Based Materialsmentioning

confidence: 99%

Composite Materials based on Light Elements for Hydrogen Storage

et al. 2005

Self Cite

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In this paper, we review our recent experimental results on hydrogen storage properties of light elements Li, C and Mg based nanocomposite materials. The results are summarized as follows: In the Li-N-H system, such as the ball milled 1:1 mixture of Li amide and Li hydride containing a small amount of TiCl 3 (1 mol%), a large amount of hydrogen ($6 mass%) is absorbed and desorbed in the temperature range from 150 to 250 C with good reversibility and high reaction rate. Furthermore, in the ball milled mixture of 3Mg(NH 2 ) 2 and 8LiH, $7 mass% of hydrogen is reversibly stored in the temperature from 140 to 220 C, indicating one of the suitable hydrogen storage materials. In graphite containing a small amount of nanometer sized Fe ($2 at.%), a large amount of hydrogen ($7 mass%) is chemisorbed by ball milling for 80 h under less than 1 MPa of H 2 -gas pressure. However, the chemisorbed hydrogen capacity decreases with increase in the milling pressure for the 80 h ball milled graphite (down to $4:1 mass% at 6 MPa), while the physisorbed hydrogen capacity in graphite increases with increase in the milling pressure, reaching up to 0:5$1:0 mass% at 6 MPa. Unfortunately, the desorption temperature of chemisorbed hydrogen is higher than 300 C. Therefore, some break-through is necessary for the development of carbon-based materials as one of the hydrogen storage systems. On the other hand, some nano-composite Mg catalyzed by Ni nano-particle or Nb oxide reveals superior reversible hydrogen storage properties: $6:5 mass% of hydrogen is reversibly stored in the temperature range from 150 to 250 C. Especially, the Nb metals uniformly dispersed in nanometer scale on the surface of MgH 2 , which was produced by reduction of Nb 2 O 5 , is the best catalyst we have studied so far. Thus, it seems that some Mg nano-composites catalyzed by nano-particles of d-electron transition metals is acceptable for practical applications.

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“…Although there are many and varied techniques for ALD in terms of the chemistries and process conditions used, metal-organic precursors are popular because of their good stability, low deposition temperature requirements, and concerns with residues from halide chemistries. [5,6] Pd and its alloys have recently been investigated for a variety of applications, including acting as a seed layer for both electroless plating [7] and electroplating [8] in IC interconnect applications, hydrogen storage, [9,10] and hydrogen detection. [11] Surface modification of polymers has been thoroughly investigated over the past two decades, with techniques including mechanical treatments, wet-chemical treatments, and plasma treatments.…”

Section: Introductionmentioning

confidence: 99%

Plasma‐Enhanced Atomic Layer Deposition of Palladium on a Polymer Substrate

Eyck

Pimanpang

Juneja

et al. 2007

Chemical Vapor Deposition

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In this paper, a method for the plasma-enhanced (PE) atomic layer deposition (ALD) of palladium on air-exposed, annealed poly(p-xylylene) (Parylene-N, or PPX) is presented. Palladium is successfully deposited on PPX at 80°C using a remote, inductively coupled, hydrogen/nitrogen plasma with palladium (II) hexafluoroacetylacetonate (Pd II (hfac) 2 ) as the precursor. By optimizing the mixture of hydrogen and nitrogen, the polymer surface is modified to introduce active sites allowing the chemisorption of the Pd II (hfac) 2 . In addition, enough free hydrogen atoms are available at the surface for ligand removal and Pd reduction, while at the same time, enough hydrogen atoms are consumed in the plasma to ensure there is no visible degradation of the PPX. X-ray photoelectron spectroscopy (XPS) measurements of the substrate after hydrogen/nitrogen plasma treatment at 50 W clearly show the presence of nitrogen bound to the substrate surface. XPS measurements of the deposited Pd films indicate good quality for both substrates, suggesting that the substrate temperature was low enough to prevent dissociation of the hfac ligand and adequate scavenging of the hfac ligand by the available atomic hydrogen. The remote hydrogen/nitrogen plasma enables Pd film deposition on polymer surfaces, which do not typically react with the Pd precursor, and are not catalysts for the dissociation of molecular hydrogen.

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Remarkable Hydrogen Storage, Structural and Optical Properties in Multi-layered Pd/Mg Thin Films

Cited by 48 publications

References 15 publications

Hydrogen electrosorption and structural properties of nanostructured Pd–Mg thin films elaborated by pulsed laser deposition

Hydrogen electrosorption and structural properties of nanostructured Pd–Mg thin films elaborated by pulsed laser deposition

Composite Materials based on Light Elements for Hydrogen Storage

Plasma‐Enhanced Atomic Layer Deposition of Palladium on a Polymer Substrate

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