Iron-based inert anode with lithium ferrite protective film and preparation method and application of iron-based inert anode

An inert anode, lithium ferrite technology, applied in the field of electrochemistry, can solve the problems of contaminated cathode products, strong anodic oxidation, anode damage, etc., and achieve the effects of low price, simple preparation method and easy processing

Active Publication Date: 2018-02-27
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, molten salt has the characteristics of strong corrosion, high temperature, and strong anodic oxidation. Ordinary metal materials often corrode or actively dissolve, which not only causes anode damage but also pollutes cathode products.

Method used

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  • Iron-based inert anode with lithium ferrite protective film and preparation method and application of iron-based inert anode
  • Iron-based inert anode with lithium ferrite protective film and preparation method and application of iron-based inert anode
  • Iron-based inert anode with lithium ferrite protective film and preparation method and application of iron-based inert anode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation of inert anode: at 650℃, with Li 2 CO 3 -Na 2 CO 3 -K 2 CO 3 (Mole ratio Li 2 CO 3 :Na 2 CO 3 :K 2 CO 3 =43.5:31.5:25) Molten salt is used as the electrolyte, and the pure iron electrode is at 100mA / cm 2 The constant current anode pre-oxidation is carried out at a current density of 10 min to prepare an iron-based inert anode with a lithium ferrite protective film.

[0026] The prepared iron-based inert anodes were tested by SEM and XRD, and the results were as follows: Figure 2-3 Shown. The SEM image shows that the pure iron electrode is covered by a dense octahedral structure oxide crystal ( figure 2 ), XRD analysis test shows that the composition of the surface oxide film is LiFe 5 O 8 ( image 3 ). This proves that the dense LiFe is prepared under the above conditions 5 O 8 Pure iron inert anode with protective film.

[0027] High temperature molten salt electrolysis experiment: at 450℃, with Li 2 CO 3 -Na 2 CO 3 -K 2 CO 3 (Mole ratio Li 2 CO 3 :Na 2 CO 3 ...

Embodiment 2

[0029] Preparation of inert anode: at 700℃, with Li 2 CO 3 -K 2 CO 3 (Mole ratio Li 2 CO 3 :K 2 CO 3 =62:38) Molten salt is used as electrolyte, nickel sheet is used as cathode, and Q235 carbon steel electrode is anodized at constant cell voltage at 2.2V cell voltage for 2h. Under these conditions, dense LiFeO is prepared. 2 Carbon steel inert anode with protective film.

[0030] High temperature molten salt electrolysis experiment: at 450℃, with Li 2 CO 3 -Na 2 CO 3 -K 2 CO 3 (Mole ratio Li 2 CO 3 :Na 2 CO 3 :K 2 CO 3 =43.5:31.5:25) Molten salt is used as electrolyte and nickel sheet is used as cathode to prepare dense LiFeO 2 The carbon steel electrode with protective film is used as inert anode. At 200mA / cm 2 Constant current electrolysis is carried out at the current density of the anode, and carbon dioxide gas is continuously introduced during the electrolysis process to obtain carbon material at the cathode and oxygen at the anode. During the electrolysis for 200 hours, the ...

Embodiment 3

[0032] Preparation of inert anode: at 750℃, with Li 2 CO 3 Molten salt is used as the electrolyte, and the 310S stainless steel electrode is at 0.7V (relative to Ag / Ag + ) Potential anode pre-oxidation for 20 minutes. Under these conditions, dense LiFeO was prepared 2 Stainless steel inert anode with protective film.

[0033] High temperature molten salt electrolysis experiment: at 650℃, with Li 2 CO 3 -Na 2 CO 3 -K 2 CO 3 (Mole ratio Li 2 CO 3 :Na 2 CO 3 :K 2 CO 3 =43.5:31.5:25) Molten salt is used as electrolyte, and iron oxide sheet is used as cathode to prepare dense LiFeO 2 The stainless steel electrode of the protective film is used as the anode. At 250mA / cm 2 Constant current electrolysis is carried out at a current density of the anode to obtain elemental iron at the cathode and oxygen at the anode. During the 20h electrolysis process, the inert anode has strong oxygen evolution capability and can remain stable for a long time. The dense LiFeO prepared in this example 2 ...

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Abstract

The invention relates to an iron-based inert anode with a lithium ferrite protective film and a preparation method and application of the iron-based inert anode. The inner layer of the iron-based inert anode is pure iron or an iron-based alloy, the outer layer of the iron-based inert anode is a lithium ferrite oxide layer, and the pure iron or the iron-based alloy undergoes electrochemical anodicoxidation in lithium-containing molten carbonate to obtain the iron-based inert anode. The iron-based inert anode has good electronic conductivity, excellent oxygen evolution catalytic performance, high stability and good thermal shock resistance; and the iron-based inert anode is low in cost and easy to process and can be used as a stable oxygen evolution inert anode in a high-temperature moltensalt electrolysis system taking carbonate as a main component.

Description

Technical field [0001] The invention belongs to the technical field of electrochemistry, and specifically relates to an iron-based inert anode with a lithium ferrite protective film, and a preparation method and application thereof. Background technique [0002] High-temperature molten salt electrolytes are widely used in metallurgical fields due to their high ion conductivity and wide electrochemical window. Molten salt electrolysis technology plays an important role in smelting metals. Most of the industrial smelting of aluminum, magnesium, rare earth metals, alkali metals and alkaline earth metals uses molten salt electrolysis technology. In recent years, new molten salt electrolysis technologies used in the fields of metallurgy, resources and environment have also appeared continuously, such as molten oxide electrolytic reduction to prepare liquid metal technology, molten salt electrolysis solid oxide metallurgy technology, molten salt capture CO 2 The process of electrochemi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C7/02C25D11/34
CPCC25C7/025C25D11/34
Inventor 汪的华杜开发郑开元朱华肖巍毛旭辉甘复兴
Owner WUHAN UNIV
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