REDOX PROCESSES AT IRON HYDROXIDE LAYERS FORMED ON PLATINUM SUBSTRATES IN ALKALINE-SOLUTIONS

被引:9
作者
GALINDO, MC [1 ]
MARTINS, ME [1 ]
VILCHE, JR [1 ]
ARVIA, AJ [1 ]
机构
[1] NATL UNIV LA PLATA,FAC CIENCIAS EXACTAS,INST INVEST FISICOQUIM TEOR & APLICADAS,RA-1900 LA PLATA,ARGENTINA
关键词
D O I
10.1007/BF01012478
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Redox processes taking place at precipitated hydrous iron hydroxide layers chemically formed on platinum substrates in sodium hydroxide solutions are investigated at 25°C. The electrochemical behaviour of these layers depends considerably on the electroreduction level reached in chargedischarge cycles. The accumulation of Fe3O4 during oxidation-reduction cycles can produce an increasing irreversibility of the Fe(II)/Fe(III) redox couple. Data are compared to results obtained with iron hydroxide layers formed by electrochemical and chemical methods on massive iron electrodes. Results are discussed in terms of a composite structure for the iron hydroxide layers. © 1990 Chapman and Hall Ltd.
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页码:102 / 109
页数:8
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