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Composite porous electrode for sulfuric acid system and preparation method thereof

A porous electrode and sulfuric acid system technology, applied in the field of electrochemistry, can solve problems such as the difficulty of direct compounding of substrates and porous layers, complex casting devices and casting processes, shortening the life of composite porous electrodes, etc., to achieve easy control of the seepage process and high yield , the effect of a reasonable structure

Inactive Publication Date: 2011-01-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the corrosion resistance of the reinforced metal substrate listed in the patent 200810031807.6 is limited in sulfuric acid solution, which greatly shortens the life of the composite porous electrode, or forms a high-impedance passivation film on the surface, causing the cell voltage to rise sharply and affect the power efficiency.
Furthermore, when the material of the reinforced metal substrate is non-Pb or Pb alloy, the direct compounding of the substrate and the porous layer is difficult, requiring complex casting devices and casting processes

Method used

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  • Composite porous electrode for sulfuric acid system and preparation method thereof
  • Composite porous electrode for sulfuric acid system and preparation method thereof
  • Composite porous electrode for sulfuric acid system and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Immerse an 8mm thick Pb-Ca(0.09wt.%)-Sn(0.98wt.%)-Al(0.011wt.%) plate in a Pb-Ag(0.8wt.%) melt at 330°C for 5s to obtain 0.05mm thick Pb-Ag transition layer, and then the reinforced metal substrate coated with Pb-Ag transition layer on the surface and K with a particle size of 0.8mm-1.0mm 2 SO 4 The filler particles are made into prefabricated blocks. Put the prefabricated block into the infiltration chamber and heat it to 250°C; heat the Pb-Ag(0.8wt.%)-Bi(0.3wt.%) alloy to 400°C to melt, and apply the filling pressure to drive the molten Pb-Ag ( 0.8wt.%)-Bi(0.3wt.%) alloy enters the percolation chamber at a speed of 0.05m / s, is filled and cooled naturally, and then the filler particles are removed by washing with hot water at 50°C to obtain Pb-Ca (0.09wt. %)-Sn(0.98wt.%)-Al(0.011wt.%) / Pb-Ag(0.8wt.%) / Pb-Ag(0.8wt.%)-Bi(0.3wt.%) composite porous electrode.

Embodiment 2

[0043] Place 304 stainless steel plate in PbCl 2 (70wt.%)-CaCl 2 (14wt.%)-NaCl (15wt.%) plating system Pb coating in molten salt, described 304 stainless steel plate thickness is 0.5mm, and described molten salt temperature is 480 ℃; Then immediately in 400 ℃ of Pb-Nd (0.1 wt.%) alloy melt for 20s to obtain a Pb-Nd transition layer with a thickness of 0.1mm. K with a particle size of 1.0mm-1.2mm 2 SO 4 The filler particles and the stainless steel plate coated with Pb-Nd transition layer are put into the infiltration chamber together and preheated to 200°C; the Pb-Ag (0.8wt.%) alloy is heated to 400°C to melt. Apply the filling pressure, drive the molten Pb-Ag (0.8wt.%) alloy to enter the infiltration chamber from the bottom of the infiltration chamber along the anti-gravity direction at a speed of 0.2m / s, and cool naturally after filling, and then remove the filler particles with clean water to obtain Steel / Pb-Nd(0.1wt.%) / Pb-Ag(0.8wt.%) composite porous electrode.

Embodiment 3

[0045] A 1mm thick Al-Si (1wt.%) alloy radial frame was exposed to PbCl at 500°C 2 (80wt.%)-CaCl 2 (9wt.%)-NaCl(10wt.%)-SnCl 2 (1wt.%) Pb-Sn alloy was plated in molten salt, and immersed in molten Pb-Sn (20wt.%) alloy at 400°C for 5s to obtain a 0.15mm thick Pb-Sn alloy transition layer. Al-Si (1wt.%) alloy radial frame coated with a Pb-Sn alloy transition layer on the surface and CaSO with a particle size of 1.6mm to 2.0mm 4 The filler particles are made into prefabricated blocks, and the prefabricated blocks are placed in the percolation chamber, and the filler particles together with the reinforced substrate are preheated to 300°C; Pb-Ag(0.3wt.%)-Ca(0.03wt.%)-Sr(0.03wt. %) alloy is heated to 500°C to melt, and the filling pressure is applied to drive the molten Pb-Ag(0.3wt.%)-Ca(0.03wt.%)-Sr(0.03wt.%) alloy from The bottom of the seepage chamber enters the seepage chamber along the anti-gravity direction, it is filled and cooled, and the NH 4 HCO 3 Aqueous solution rem...

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Abstract

The invention discloses a composite porous electrode for a sulfuric acid system and a preparation method thereof. From inside to outside, the electrode is sequentially provided with an enhanced metal substrate, a Pb or Pb-based alloy (Pb-Me') transition layer and a Pb or Pb-based alloy (Pb-Me'') porous layer. The preparation method for the electrode comprises the following steps of: preparing the transition layer by performing chemical plating and metal melt immersion plating in the molten salts of chlorides or directly by performing the metal melt immersion plating, and preparing the porous layer by adopting an infiltration method or an antigravity infiltration method. Due to the adoption of the transition layer, the enhanced metal substrate and the porous layer in the composite porous electrode are combined more firmly, even electrolyte cannot permeate into and corrode the substrate through the porous layer, and the electrode has longer service life. The method of the invention has the advantages of preparing the composite porous electrode with firm combination among composite layers, strong strength, high corrosion resistance and long service life, and solving the long-term problems of short service life and weak strength of the electrode in the sulfuric acid system, along with simplicity and rational structure.

Description

technical field [0001] The invention relates to a composite porous electrode for a sulfuric acid system and a preparation method thereof, in particular to a preparation method of a composite porous anode for metal electrowinning or electroplating and a composite porous electrode for organic electrosynthesis. It belongs to the field of electrochemical technology. Background technique [0002] Sulfuric acid is a widely used electrolyte, but its strong corrosive properties make few anodes that can be used in this electrolyte system. Pb or Pb-based alloy electrodes can form a layer of PbO with strong corrosion resistance when anodized in sulfuric acid solution. 2 It has become the most commonly used electrode material in the sulfuric acid electrolyte system, especially as an insoluble anode for metal electrodeposition or electroplating and as a corrosion-resistant cathode or anode for organic electrosynthesis. [0003] The current density of organic electrosynthesis is general...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/03C25B11/04C25C7/02
CPCH01M4/14H01M4/667H01M4/16H01M4/82H01M4/0452H01M4/0454Y02E60/126H01M4/0485Y02E60/10
Inventor 赖延清蒋良兴李劼刘业翔吕晓军刘宏专郝科涛洪波李渊
Owner CENT SOUTH UNIV
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