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Development of hydriding alloys with multi-functionally-graded properties and their applications to energy conversion devices; Keishagata fukugo kino wo hyomen ni motsu suiso kyuzo gokin no kaihatsu to energy henkan gijutsu eno oyo

Abstract

This paper describes the formation of fluoride layer on the surface of hydriding alloys. The fluoride formation reaction consists of a reduction removal process of surface oxide and a fluorination process. Specific surface area of alloy grains can be increased by the hydrogenation reaction in the surface layer accompanied with the removal of surface oxide, which results in easier permeation of molecular hydrogen into fluoride layer. During the fluorination process, a large amount of Ni in the alloy components is eluted, which results in the reduction of Ni distribution immediately under the fluoride layer in the alloy. Consequently, collector sites near the surface are reduced, and conductivity among alloy grains is degraded. To enhance the hydrogen collector sites, specific surface area of alloy grains can be increased by controlling the pH value of fluorination treatment solution in a given range. Moreover, performance of fluoride layer can be advanced by electrochemically dispersing metal Ni in the fluoride layer using Ni complex ion mixed in the treatment solution. 2 refs., 3 figs.
Authors:
Suda, S; Kadoma, H; Nagamoto, H; Okura, T [1] 
  1. Kogakuin University, Tokyo (Japan)
Publication Date:
Feb 01, 1997
Product Type:
Conference
Report Number:
CONF-970283-
Reference Number:
SCA: 080201; 300800; 360600; PA: NEDO-97:820057; EDB-97:110418; SN: 97001833138
Resource Relation:
Conference: Report meeting for the results of `the publicly applied proposal type and hi-tech (emphasized) field research and development in fiscal 1995`, 1995 nendo teian kobogata saisentan (juten) bun`ya kenkyu kaihatsu seika hokokukai, Tokyo (Japan), 12-14 Feb 1997; Other Information: PBD: Feb 1997; Related Information: Is Part Of Preprint of the results of `the publicly applied proposal type and hi-tech (emphasized) field research and development in fiscal 1995`; PB: 469 p.; `1995 nendo teian kobogata saisentan (juten) bun`ya kenkyu kaihatsu` seika hokokukai yokoshu
Subject:
08 HYDROGEN FUEL; 30 DIRECT ENERGY CONVERSION; 36 MATERIALS SCIENCE; HYDROGEN STORAGE; ALLOYS; HYDRIDES; ENERGY CONVERSION; FLUORIDES; FLUORINATION; LAYERS; INTERMETALLIC COMPOUNDS; HYDRIDATION; DEHYDRIDATION; SPECIFIC SURFACE AREA; NICKEL
OSTI ID:
510512
Research Organizations:
New Energy and Industrial Technology Development Organization, Tokyo (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE97757283; TRN: 97:820057
Availability:
Available from New Energy and Industrial Technology Development Organization, Sunshine 60, 30F 1-1, 3-chome, Higashi-Ikebukuro, Toshima-ku, Tokyo, Japan; OSTI as DE97757283
Submitting Site:
NEDO
Size:
pp. 436-437
Announcement Date:

Citation Formats

Suda, S, Kadoma, H, Nagamoto, H, and Okura, T. Development of hydriding alloys with multi-functionally-graded properties and their applications to energy conversion devices; Keishagata fukugo kino wo hyomen ni motsu suiso kyuzo gokin no kaihatsu to energy henkan gijutsu eno oyo. Japan: N. p., 1997. Web.
Suda, S, Kadoma, H, Nagamoto, H, & Okura, T. Development of hydriding alloys with multi-functionally-graded properties and their applications to energy conversion devices; Keishagata fukugo kino wo hyomen ni motsu suiso kyuzo gokin no kaihatsu to energy henkan gijutsu eno oyo. Japan.
Suda, S, Kadoma, H, Nagamoto, H, and Okura, T. 1997. "Development of hydriding alloys with multi-functionally-graded properties and their applications to energy conversion devices; Keishagata fukugo kino wo hyomen ni motsu suiso kyuzo gokin no kaihatsu to energy henkan gijutsu eno oyo." Japan.
@misc{etde_510512,
title = {Development of hydriding alloys with multi-functionally-graded properties and their applications to energy conversion devices; Keishagata fukugo kino wo hyomen ni motsu suiso kyuzo gokin no kaihatsu to energy henkan gijutsu eno oyo}
author = {Suda, S, Kadoma, H, Nagamoto, H, and Okura, T}
abstractNote = {This paper describes the formation of fluoride layer on the surface of hydriding alloys. The fluoride formation reaction consists of a reduction removal process of surface oxide and a fluorination process. Specific surface area of alloy grains can be increased by the hydrogenation reaction in the surface layer accompanied with the removal of surface oxide, which results in easier permeation of molecular hydrogen into fluoride layer. During the fluorination process, a large amount of Ni in the alloy components is eluted, which results in the reduction of Ni distribution immediately under the fluoride layer in the alloy. Consequently, collector sites near the surface are reduced, and conductivity among alloy grains is degraded. To enhance the hydrogen collector sites, specific surface area of alloy grains can be increased by controlling the pH value of fluorination treatment solution in a given range. Moreover, performance of fluoride layer can be advanced by electrochemically dispersing metal Ni in the fluoride layer using Ni complex ion mixed in the treatment solution. 2 refs., 3 figs.}
place = {Japan}
year = {1997}
month = {Feb}
}