SELF RESTORING OF THE ACTIVE SURFACE IN LANI5

被引：71

作者：

SCHLAPBACH, L ^{[1
]}

SEILER, A ^{[1
]}

SIEGMANN, HC ^{[1
]}

WALDKIRCH, TV ^{[1
]}

ZURCHER, P ^{[1
]}

BRUNDLE, CR ^{[1
]}

机构：

[1] IBM CORP,RES LAB,SAN JOSE,CA 95193

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 1979年 / 4卷 / 01期

关键词：

D O I：

10.1016/0360-3199(79)90126-5

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Investigations of LaNi5 by means of photoemission spectroscopy, Auger electron spectroscopy and measurements' of the magnetic susceptibility and magnetization show that in a surface layer La diffuses to the surface and metallic Ni precipitations are formed. This surface segregation is enhanced by the presence of oxygen. The segregation continues with each cycle of hydrogenation. This represents a self restoring mechanism of the active surface, since the highly reactive La oxidizes and keeps the Ni metallic. Dissociative adsorption of H2 then occurs at the Ni precipitations. © 1979.

引用

页码：21 / 28

页数：8

共 15 条

[1]

BAER Y, UNPUBLISHED

[2]

BRUNDLE CR, 1977, 7TH P INT VAC C 3RD, P1171

[3]

BRUNNER J, 1977, HELV PHYS ACTA, V50, P142

[4]

BURTON JJ, 1975, J CATAL, V37, P106, DOI 10.1016/0021-9517(75)90138-4

[5]

BUSCH G, 1977, 2ND P INT C HYDR MET

[6]

BUSCH GE, UNPUBLISHED

[7]

DAVIS LE, 1976, HDB AUGER ELECTRON S

[8]

FISCHER P, 1977, HELV PHYS ACTA, V50, P421

[9] CONTROL OF HYDROGEN ABSORPTION AND DESORPTION OF RARE-EARTH INTERMETALLIC COMPOUNDS [J].

GUALTIERI, DM ;

NARASIMHAN, KSVL ;

TAKESHITA, T .

JOURNAL OF APPLIED PHYSICS, 1976, 47 (08) :3432-3435

[10] SURFACE COMPOSITION OF BINARY-SYSTEMS - PREDICTION OF SURFACE PHASE-DIAGRAMS OF SOLID-SOLUTIONS [J].

OVERBURY, SH ;

BERTRAND, PA ;

SOMORJAI, GA .

CHEMICAL REVIEWS, 1975, 75 (05) :547-560

← 1 2 →