分析电化学的见解 开放获取

抽象的

Electrochemical Investigation on the Stable Iron Species in Molten FLINAK

Hao Peng, Miao Shen, Chenyang Wang, Yong Zuo, Leidong Xie

The electrochemical behavior of Fe(III) in molten LiF–NaF–KF [46.5:11.5:42 (mol%)] [FLINAK] salt was studied by cyclic voltammetry (CV), chronopotentiometry (CP) and square wave voltammetry (SWV) at 600°C. It was found that Fe(III) was initially reduced to Fe(II) at +2.0 V (vs. alkalis) followed by reduction of Fe(II) to Fe at +1.4 V (vs. alkalis) and both reduction processes were controlled by ion diffusion. Diffusion coefficients of Fe(III) in molten FLINAK were calculated through CV and CP. The reduction peak of Fe(III)/Fe(II) was still observed in SWVs even though only FeF2 was added to FLINAK. This result showed that Fe(II) was converted to Fe(III), which exists stably in FLINAK melts.