INTERFACIAL ELECTROSTATIC BEHAVIOR OF OXIDES - CORRELATIONS WITH STRUCTURAL AND SURFACE PARAMETERS OF THE PHASE

被引:33
作者
ARDIZZONE, S
CATTANIA, MG
LUGO, P
机构
[1] UNIV MILAN,CNR,CSRSRC,I-20133 MILAN,ITALY
[2] UNIV MILAN,DEPT CHEM PHYS,I-20133 MILAN,ITALY
关键词
OXIDES; DOUBLE LAYER; SURFACE HETEROGENEITY;
D O I
10.1016/0013-4686(94)85128-X
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
The electrochemical behaviour of aqueous suspensions of ZrO2 powders, either pure phase (monoclinic and tetragonal) or mixtures of polymorphs, was investigated. Surface charge and total capacitance vs. pH curves, for the pure oxides, were regular showing different values of points of zero charge and low inner layer capacitance values. The mixtures of the polymorphs presented atypical interfacial electrochemical features which were interpreted as due to patch wise heterogeneity. This latter hypothesis was supported by XPS analyses of the powders which indicated, in the case of the mixtures of the polymorphs, the presence of heterogeneity both in composition and in the acid-base character of the surface sites.
引用
收藏
页码:1509 / 1517
页数:9
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