Surface passivation of metal hydrides for applications
- Kogakuin Univ., Hachioji, Tokyo (Japan). Dept. of Environmental and Chemical Engineering
Properties and characteristics of hydriding alloys are strongly dependent on surface compositions and morphologies. For instance, oxides such as La{sub 2}O{sub 3} on AB{sub 5} alloys and ZrO{sub 2} on AB{sub 2}, AB, and body-centered-cubic (BCC) alloys act as the barriers for the conversion of molecular and ionic hydrogen to atomic hydrogen at the surface, thus reducing the kinetics in both the gas-solid and electrochemical reactions. Alloy surfaces chemically treated by an aqueous F-ion containing solution have been developed to solve such problems. F-treated surfaces exhibit significantly improved characteristics in regard to the hydrogen uptakes and the protection against impurities and electrolyte solution. In addition, highly conductive metallic Ni layers can be formed on the surface of the alloy particles by the fluorination. The authors report the properties and characteristics of fluorinated hydriding alloys, mainly of a typical AB{sub 2} Laves phase material which represents the difficult activation characteristics and poor long-term durability during electrochemical charge/discharge cycles.
- OSTI ID:
- 308087
- Report Number(s):
- CONF-980405-; TRN: IM9907%%13
- Resource Relation:
- Conference: Spring meeting of the Materials Research Society, San Francisco, CA (United States), 13-17 Apr 1998; Other Information: PBD: 1998; Related Information: Is Part Of Hydrogen in semiconductors and metals; Nickel, N.H. [ed.] [Hahn-Meitner-Inst., Berlin (Germany)]; Jackson, W.B. [ed.] [Xerox Palo Alto Research Center, CA (United States)]; Bowman, R.C. [ed.] [Jet Propulsion Lab., Pasadena, CA (United States)]; Leisure, R.G. [ed.] [Colorado State Univ., Fort Collins, CO (United States)]; PB: 469 p.; Materials Research Society symposium proceedings, Volume 513
- Country of Publication:
- United States
- Language:
- English
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