Electrochemical reactions of La(Ni,Cr)O3 and La(Ni,Fe)O3 in acidic aqueous solutions

Electrochemical reactions of La(Ni,Cr)O3 and La(Ni,Fe)O3 in acidic aqueous solutions
复制标题

La(Ni,Cr)O3 和 La(Ni,Fe)O3 在酸性水溶液中的电化学反应

DOI:
--
复制
发表时间:
1999
期刊:
影响因子:
--
通讯作者:
T. Grygar
T. Grygar
中科院分区:
--
文献类型:
--
作者:
T. Grygar

文献摘要

被引文献

相似文献

摘要固定的微晶钙钛矿La(Ni,Cr)O3和La(Ni,Fe)O3的伏安法显示,这些氧化物在酸性水溶液(0.1 M HClO 4)中产生三种类型的反应:不可逆的富铬氧化物的氧化溶解,不可逆的富铁氧化物的还原溶解,和一个准可逆的反应,最有可能涉及改变的Cr,Fe和/或Ni的化合价在固态。La(Cr 1-xNix)O3(x = 0.3和0.5)的样品尤其显示出有限的循环稳定性,这在非常强的酸性溶液中是特别令人惊讶的。
Abstract Voltammetry of immobilised microcrystalline perovskites La(Ni,Cr)O3 and La(Ni,Fe)O3 revealed that these oxides yield three types of reactions in acidic aqueous solutions (0.1 M HClO4): irreversible oxidative dissolution of Cr-rich oxides, irreversible reductive dissolution of Fe-rich oxides, and a quasi-reversible reaction most likely related to alteration of the valencies of Cr, Fe and/or Ni in the solid state. The samples of La(Cr1−xNix)O3 with x = 0.3 and 0.5 especially showed limited cycling stability that is particularly surprising in the very strongly acidic solution.