Electrochemical behavior of Fe(III) in Na2SiO3-SiO2-Fe2O3 molten salt

被引：1

作者：

Feng, Sen ^{[1
]}

Zhang, Jun-jie ^{[1
]}

Diop, Mouhamadou Aziz ^{[1
]}

Liu, Ai-min ^{[1
]}

Wang, Zhao-wen ^{[1
]}

Boca, Miroslav ^{[2
]}

Shi, Zhong-ning ^{[3
]}

机构：

[1] Northeastern Univ, Key Lab Ecol Met Multimet Mineral, Minist Educ, Shenyang 110819, Peoples R China

[2] Slovak Acad Sci, Inst Inorgan Chem, Dubravska cesta 9, SK-84536 Bratislava, Slovakia

[3] Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110819, Peoples R China

来源：

JOURNAL OF CENTRAL SOUTH UNIVERSITY | 2024年 / 31卷 / 09期

基金：

中国国家自然科学基金;

关键词：

molten oxide electrolysis (MOE); electrochemical behavior; cyclic voltammetry; potentiostatic electrolysis; diffusion coefficients; Fe(III); IRON; SILICON; ELECTRODEPOSITION; REDUCTION; COMPLEXES; OXIDE;

D O I：

10.1007/s11771-024-5803-4

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The high-temperature requirement for liquid iron smelting via molten oxide electrolysis presents significant challenges. This study investigates the electrochemical reduction of Fe(III) in a novel low-temperature electrolyte, Na2SiO3-SiO2-Fe2O3, utilizing cyclic voltammetry and square wave voltammetry techniques. The results show that Fe(III) reduction occurs in two steps: Fe(III)+e(-)-> Fe(II), Fe(II)+2e(-)-> Fe, and that the redox process of Fe(III)/Fe(II) at the tungsten electrode is an irreversible reaction controlled by diffusion. The diffusion coefficients of Fe(III) in the molten Na2SiO3-SiO2-Fe2O3 in the temperature range of 1248-1278 K are between 1.86x10(-6) cm(2)/s and 1.58x10(-4) cm(2)/s. The diffusion activation energy of Fe(III) in the molten salt is 1825.41 kJ/mol. As confirmed by XRD analysis, potentiostatic electrolysis at -0.857 V (vs. O-2/O-(complex)(2-)) for 6 h produces metallic iron on the cathode.

引用

页码：3024 / 3033

页数：10

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