Comparison of hydrogen absorption properties of Ti mechanically milled with hexagonal boron nitride (h-BN) and with graphite

Kondo, Toshihiko; Shindo, Kazuhiko; Sakurai, Yasuhisa

doi:10.1016/j.jallcom.2004.04.147

Cited by 25 publications

(22 citation statements)

References 18 publications

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“…Ti metal is known to be a good absorber of hydrogen. 20) Therefore, it is considered that the hydrogen gas that formed at the cathode 21) was absorbed by Ti during the electrodeposition. In Fig.…”

Section: Methodsmentioning

confidence: 99%

Coating of hydroxyapatite films on titanium substrates by electrodeposition under pulse current

Hayakawa

Kawashita

Takaoaka

2008

J. Ceram. Soc. Japan

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Titanium (Ti) metal substrates were etched in sulfuric acid (H 2 SO 4 ) with concentrations of 25, 50, 75 and 97 at 60°C for 30 min. Hydroxyapatite (HA) films were deposited onto unetched and etched substrates by an electrodeposition method under a pulse current. The electrolyte was metastable calcium phosphate solution that had 1.5 times the ion concentrations of human body fluid, but did not contain magnesium ion at 36.5°C. Deposition times were 90 min. We used the average current density of 0.01 A/cm 2 and ON time equal to OFF time of 15 s. In the electrodeposition, hydrogen was incorporated into the surface of the Ti substrates to form titanium hydride (TiH 2 ) on the substrate surfaces. After the electrodeposition, all specimens were heated at 600°C for 60 min. The adhesion between apatite and substrates were greatly improved by the heat treatment for the substrates etched in 50 and 75 H 2 SO 4 . It is considered that in these specimens the anchoring effect due to the microstructural roughness formed by etching was enhanced by the shrinking of HA crystals during the heat treatment.

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Section: Methodsmentioning

confidence: 99%

Coating of hydroxyapatite films on titanium substrates by electrodeposition under pulse current

Hayakawa

Kawashita

Takaoaka

2008

J. Ceram. Soc. Japan

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“…Following the work, BN sheets were prepared by exposing borazine on the transition metal surface [16][17][18]. Hydrogen storage properties of BN nanotubes have been well investigated, however only little attention has been paid to sheets [19][20][21][22][23]. Alonso et al using DFT method claimed that adsorption capacity of h-BN sheets is similar to carbon nanotubes [24].…”

Section: Introductionmentioning

confidence: 99%

First-principles study of hydrogen storage over Ni and Rh doped BN sheets

et al. 2009

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a b s t r a c tAbsorption of hydrogen molecules on Nickel and Rhodium-doped hexagonal boron nitride (BN) sheet is investigated by using the first principle method. The most stable site for the Ni atom was the on top side of nitrogen atom, while Rh atoms deservers a hollow site over the hexagonal BN sheet. The first hydrogen molecule was absorbed dissociatively over Rh atom, and molecularly on Ni doped BN sheet. Both Ni and Rh atoms are capable to absorb up to three hydrogen molecules chemically and the metal atom to BN sheet distance increases with the increase in the number of hydrogen molecules. Finally, our calculations offer explanation for the nature of bonding between the metal atom and the hydrogen molecules, which is due to the hybridization of metal d orbital with the hydrogen s orbital. These calculation results can be useful to understand the nature of interaction between the doped metal and the BN sheet, and their interaction with the hydrogen molecules.

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“…It has been reported that milling with graphite improves the kinetics of hydrogen absorption and if the milling time is short, it does not affect the hydrogen absorption capacity [7,8]. Furthermore, we need not worry about the thermal decomposition or phase transition of the alloy because this activation treatment does not require a high temperature.…”

Section: Hydrogen Absorption-desorption Propertiesmentioning

confidence: 99%

Hydrogen absorption–desorption properties of Mg–Ca–V BCC alloy prepared by mechanical alloying

Kondo

Sakurai

2006

Journal of Alloys and Compounds

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Comparison of hydrogen absorption properties of Ti mechanically milled with hexagonal boron nitride (h-BN) and with graphite

Cited by 25 publications

References 18 publications

Coating of hydroxyapatite films on titanium substrates by electrodeposition under pulse current

Coating of hydroxyapatite films on titanium substrates by electrodeposition under pulse current

First-principles study of hydrogen storage over Ni and Rh doped BN sheets

Hydrogen absorption–desorption properties of Mg–Ca–V BCC alloy prepared by mechanical alloying

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