ELECTRON SPECTROSCOPIC STUDY OF THE INTERACTION OF OXYGEN WITH CO(1120) AND OF COADSORPTION WITH WATER

被引:32
作者
GRELLNER, F [1 ]
KLINGENBERG, B [1 ]
BORGMANN, D [1 ]
WEDLER, G [1 ]
机构
[1] UNIV ERLANGEN NURNBERG, INST PHYS & THEORET CHEM, D-91058 ERLANGEN, GERMANY
关键词
AES; CO(11(2)OVER-BAR-0); OXYGEN; UPS; WORK FUNCTION; XPS;
D O I
10.1016/0368-2048(94)02261-5
中图分类号
O433 [光谱学];
学科分类号
0703 ; 070302 ;
摘要
Coverage dependence of oxygen adsorption on the hexagonal Co(11 ($) over bar 20) surface is studied at 100 and 320 K by means of Auger electron spectroscopy (AES), photoelectron spectroscopy (XPS, UPS) and change in work function (Delta phi). Adsorption of oxygen at 100 K leads to the formation of Co3O4-like features together with adsorbed oxygen. An influence of a precursor on the adsorption kinetics is proposed. Oxygen at 320 K builds up CoO, and the uptake behaviour is explained best in terms of chemisorption and oxide nucleation followed by island growth of the oxide. The explanation of the nature of a second oxygen species, observed in the Ols XP spectra, and the characterisation of OH are facilitated by a coadsorption experiment with oxygen and water at 100 K.
引用
收藏
页码:107 / 115
页数:9
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