Formation of nickel hydrides by hydrogen evolution in alkaline media: effect of temperature

被引：16

作者：

Bernardini, M ^{[1
]}

Comisso, N ^{[1
]}

Mengoli, G ^{[1
]}

Sinico, L ^{[1
]}

机构：

[1] CNR, IPELP, Ist Polarografia, I-35127 Padua, Italy

来源：

JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 1998年 / 457卷 / 1-2期

关键词：

electrolytic reduction; hydrogen (deuterium) evolution reaction (her); nickel hydrides; temperature effects;

D O I：

10.1016/S0022-0728(98)00307-6

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The effect of temperature on the hydrogenation of sintered Ni by the hydrogen evolution reaction (her) in 0.6 M K2CO3 + H2O electrolyte was investigated in the range 25-95 degrees C. At 25 degrees C, hydrogenation leads to the formation of three different species, provisionally identified as beta-NI-, hexagonal-Ni- and alpha-Ni-hydride phases, based on their respective redox potentials and thermostability. Their penetration into the metal ranged from a few tens to a few hundred monolayers. Above room temperature, the overall efficiency and penetration of Ni hydrogenation increased significantly. Furthermore, there is definite evidence that, at T greater than or equal to 65 degrees C, the beta-Ni-hydride phase evolves into new Ni-hydrogen species of higher thermal stability, regarding which there is no previous knowledge. The results of electrolytic Ni deuteration by electrolysis of K2CO3 + D2O conformed to those obtained in light water. (C) 1998 Elsevier Science S.A. All rights reserved.

引用

页码：205 / 219

页数：15

共 22 条

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