IN-SITU X-RAY-ABSORPTION FINE-STRUCTURE MEASUREMENTS OF LANI5 ELECTRODES IN ALKALINE ELECTROLYTES

被引：20

作者：

TRYK, DA ^{[1
]}

BAE, IT ^{[1
]}

HU, YN ^{[1
]}

KIM, SH ^{[1
]}

ANTONIO, MR ^{[1
]}

SCHERSON, DA ^{[1
]}

机构：

[1] ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 1995年 / 142卷 / 03期

关键词：

D O I：

10.1149/1.2048542

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

In situ Ni K-edge and La L(m)-edge x-ray absorption fine structure (XAFS) measurements of LaNi5 electrodes supported on hydrophobic carbon black-polytetrafluoroethylene (PTFE) layers were carried out in strongly alkaline electrolytes as a function of the state of charge. The Ni K-edge x-ray absorption near-edge structure (XANES) for the material in the discharged (and uncharged) and charged states were essentially identical to those reported earlier for crystalline LaNi5 before and after exposure to gas-phase hydrogen, respectively. The Ni K-edge extended x-ray absorption fine structure (EXAFS) analysis of the most prominent shell yielded average Ni-Ni nearest neighbor distances of 2.52 +/- 0.02 Angstrom for the charged compared to 2.47 +/- 0.02 Angstrom for the discharged and uncharged electrodes. For the La L(m)-edge XANES, the white line was found to be significantly more intense for the charged than for the uncharged LaNi5, an effect consistent with an increase in the density of empty d-like states just above the Fermi level on hydrogen injection.

引用

页码：824 / 828

页数：5

共 36 条

[1] COORDINATION AND VALENCE OF NIOBIUM IN TIO2 NBO2 SOLID-SOLUTIONS THROUGH X-RAY ABSORPTION-SPECTROSCOPY [J].