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Journal Articles

Synergic effects of ion irradiations (La, Ce) and alkaline pretreatment (KOH) on hydriding kinetic property of a Mm-Ni based alloy

Abe, Hiroshi; Aone, Shigeo*; Morimoto, Ryo*; Uchida, Hirohisa*

Journal of Alloys and Compounds, 580(Suppl.1), p.S219 - S221, 2013/12

 Times Cited Count:5 Percentile:36.63(Chemistry, Physical)

no abstracts in English

Journal Articles

Effects of ultra-intense laser driven proton beam on the hydriding property of palladium

Abe, Hiroshi; Orimo, Satoshi; Kishimoto, Masahiko*; Aone, Shigeo*; Uchida, Hirohisa*; Daido, Hiroyuki; Oshima, Takeshi

Nuclear Instruments and Methods in Physics Research B, 307, p.218 - 220, 2013/07

 Times Cited Count:1 Percentile:12.7(Instruments & Instrumentation)

We investigated the structure changes of a hydrogen storage alloy by ion irradiations, and its absorption property in order to obtain basic data and to elucidate relevant mechanisms of hydrogen absorption by the influence of the irradiation. In previous studies, the induction of vacancies in a hydrogen absorption alloy was found to be effective to increase in the hydrogen absorption rate. As well known, the rate of hydrogen absorption strongly depends upon the surface state of a hydrogen storage alloy because the dissociation of hydrogen molecules or water molecules needs electron change with the surface in the H$$_{2}$$ gas or electrochemical reaction process. In this study, ion irradiations were made at a room temperature using the laser driven proton beam method, at Kansai Photon Science Institute, Japan Atomic Energy Agency. The beam treatment has several unique properties such as short pulse duration, high peak current, low transverse emittance, and wide energy range from KeV to MeV. The irradiation was used to modify the alloy surface using this equipment. From obtained results, the initial hydrogen absorption rate was found improved by the laser driven proton beam rather more effectively than a mono-energetic proton beam. Discussion is made on the correlation among proton irradiation (laser driven proton or mono-energetic proton) and the initial hydrogen absorption rate of the alloy. We argue about the usefulness of an energy spread beam.

Journal Articles

Improvement of hydrogen absorption characteristics of Pd using irradiation of heavey ions

Abe, Hiroshi; Aone, Shigeo*; Morimoto, Ryo*; Uchida, Hirohisa*; Oshima, Takeshi

Transactions of the Materials Research Society of Japan, 36(1), p.133 - 135, 2011/03

The introduction of vacancies in Pd was found to be effective for an increase in the initial hydrogen absorption rate in a previous study. Also, it was reported that the initial hydrogen absorption rate depends strongly on the surface conditions of metals. Heavy ions with keV ranges can create severe damage and high densities of vacancy near the surface of materials. As well known, the formation of hydride phases can be facilitated by the presence of vacancy because vacancy acts as hydrogen trapping site to form hydrides. Thus, the hydrogen absorption characteristics of Pd may be improved by the irradiation of heavy ions. As a result, the initial hydrogen absorption rate increased due to ion irradiation, and the value became 3$$sim$$10 times higher than un-irradiated Pd.

Journal Articles

Effects of ion irradiation on hydrogen storage characteristics of alkaline pretreatment Mm alloy

Abe, Hiroshi; Aone, Shigeo*; Uchida, Hirohisa*; Oshima, Takeshi

JAEA-Review 2008-055, JAEA Takasaki Annual Report 2007, P. 145, 2008/11

no abstracts in English

Oral presentation

Influence of ion irradiation on the electrochemical hydrogenation characteristic of Pd

Aone, Shigeo*; Morimoto, Ryo*; Abe, Hiroshi; Uchida, Hirohisa*

no journal, , 

no abstracts in English

Oral presentation

Characteristics of electrochemical hydrogen abofsorption of Pd by ion irradiation

Abe, Hiroshi; Morimoto, Ryo*; Aone, Shigeo*; Uchida, Hirohisa*; Oshima, Takeshi

no journal, , 

no abstracts in English

Oral presentation

Effects of surface modification and hydrogen characteristics of Pd using an ion irradiation

Abe, Hiroshi; Morimoto, Ryo*; Aone, Shigeo*; Uchida, Hirohisa*; Oshima, Takeshi

no journal, , 

no abstracts in English

Oral presentation

Effects of copper ion irradiation on the rate of electrochemical hydrogen absorption of Pd

Aone, Shigeo*; Abe, Hiroshi; Uchida, Hirohisa*

no journal, , 

no abstracts in English

Oral presentation

Effects of ion irradiations and KOH pretreatment on hydrogen absorption rate of the MmNi$$_{5-x}$$(Al, Mn, Co)$$_{x}$$ alloy

Aone, Shigeo*; Uchida, Hirohisa*; Abe, Hiroshi

no journal, , 

The effects of ion irradiation and a KOH pretreatment on the rate of electrochemical hydrogen absorption by the MmNi$$_{5-x}$$(Al, Mn, Co)$${x}$$ alloy were investigated. The ion irradiation method is known to produce a high density of vacancy type defects in metals. In previous studies, we reported the remarkable enhancement of the initial rate of hydrogen absorption by the LaNi$$_{5}$$ with pretreatments of alkaline hydroxide solutions such as KOH. In addition, we revealed that the hydriding properties of the alloy and Pd can be improved by ion irradiations at TIARA (Takasaki Ion Accelerators for Advanced Radiation Application), JAEA. In this study, we examined the effects of surface modifications by the alkaline treatment and ion irradiations. The both pretreatments are found effective to improve kinetics of hydrogen absorption by the alloy.

Oral presentation

Effect of surface modifications of Pd by ion irradiation on the characteristics of hydrogen absorption

Abe, Hiroshi; Morimoto, Ryo*; Aone, Shigeo*; Uchida, Hirohisa*; Oshima, Takeshi

no journal, , 

In previous studies, the induction of vacancy in palladium (Pd) was found to be effective for an increase in the initial hydrogen absorption rate. As well known, the initial hydrogen absorption rate depends strongly on the surface conditions of metals. Based on these results, we made surface modifications of Pd using various ions at TIARA, JAEA. In this study, we perform Cr ion irradiation into Pd, and the hydrogen absorption rate of ion irradiation Pd was evaluated. The Pd irradiated at a fluence to 1$$times$$10$$^{17}$$ cm$$^{-2}$$ exhibited the highest rate in all samples, and the hydrogen absorption rate became five times higher than that of un-irradiated Pd. Since vacancy type defects which might act as hydrogen trapping site are introduced by irradiation the enhancement of the hydrogen absorption rate obtained inthi study can be interpreted in terms of an increase of hydrogen trapping saites near the surface region due to irradiation of Cr ion into Pd.

Oral presentation

Effects of ion irradiation and alkaline pretreatment on surface modification for Mm hydrogen alloys

Abe, Hiroshi; Aone, Shigeo*; Uchida, Hirohisa*; Oshima, Takeshi

no journal, , 

no abstracts in English

Oral presentation

Effects of proton irradiation on the hydriding characteristics of hydrogen absorption material

Abe, Hiroshi; Orimo, Satoshi; Kishimoto, Masahiko*; Aone, Shigeo*; Uchida, Hirohisa*; Daido, Hiroyuki; Oshima, Takeshi

no journal, , 

no abstracts in English

Oral presentation

Substitution effect of (La$$_{1-x}$$Ce$$_{x}$$)Ni$$_{5-y}$$(Al, Mn, Co)$$_{y}$$ hydrogen storage alloys

Abe, Hiroshi; Yoneda, Yasuhiro; Aone, Shigeo*; Uchida, Hirohisa*

no journal, , 

no abstracts in English

Oral presentation

Reforming on surface of metallic material for fuel cell by using high-intensity laser driven proton beam

Orimo, Satoshi; Abe, Hiroshi; Daido, Hiroyuki; Nishiuchi, Mamiko; Kishimoto, Masahiko*; Aone, Shigeo*; Uchida, Hirohisa*; Ogura, Koichi; Pirozhkov, A. S.; Suguyama, Hironori*; et al.

no journal, , 

The fuel cell was researched in the Kansai Photon Science Institute, JAEA. It has aimed at the surface modification of a metallic material. The laser driven proton beam is a spectrum of 10 kev-MeV that the pulse duration is about ns. The irradiation did -10-100 shot by 1Hz J-KAREN laser system.

Oral presentation

Synergy effects of electron/ion irradiation and alkaline pretreatment on hydriding property of hydrogen storage alloys

Abe, Hiroshi; Aone, Shigeo*; Kishimoto, Masahiko*; Muraki, Keita*; Uchida, Hirohisa*; Oshima, Takeshi

no journal, , 

no abstracts in English

Oral presentation

Effects of surface modification by ion (H$$^+$$, Bi$$^+$$) irradiation and alkaline treatment on the electrochemical hydrogen absorption rate

Nakajima, Hiroto*; Aone, Shigeo*; Abe, Hiroshi; Uchida, Hirohisa*

no journal, , 

no abstracts in English

Oral presentation

Synergic effects of ion irradiation and alkaline pretreatment on property of hydrogen storage alloy

Abe, Hiroshi; Aone, Shigeo*; Morimoto, Ryo*; Uchida, Hirohisa*; Oshima, Takeshi

no journal, , 

no abstracts in English

17 (Records 1-17 displayed on this page)
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