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Preparation method of zero anode potential hydrogen diffusion anode

An anode potential and anode technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of expensive anode cost, achieve the effects of eliminating lead pollution, stabilizing physical and chemical properties, and improving the quality of electrolytic metals

Inactive Publication Date: 2011-12-07
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the limited structural characteristics of the above-mentioned stacked hydrogen diffusion anode, the catalytic layer is coated on the carbon cloth, so the noble metal catalytic layer (the Pt catalytic layer accounts for more than 90% of the cost of the anode material) cannot be reused, resulting in expensive anodes

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  • Preparation method of zero anode potential hydrogen diffusion anode
  • Preparation method of zero anode potential hydrogen diffusion anode
  • Preparation method of zero anode potential hydrogen diffusion anode

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preparation example Construction

[0018] 2) Preparation of the gas diffusion layer: PTFE, anhydrous Na 2 SO 4 , Acetylene black. After stirring evenly, add an appropriate amount of absolute ethanol to fully wet the mixture, and then add a required proportion of PTFE (30%) emulsion and soak for 48 hours. After grinding and stirring in a mortar to form a ball, place it on a film rolling machine at about 70°C and roll repeatedly until the surface becomes fibrous, then stop the rolling, and the thickness is 0.5mm to obtain a gas diffusion layer.

[0019] 3) Preparation of gas catalytic layer: Weigh activated carbon, acetylene black, PTFE and catalyst in a mass ratio of 60:10:20:5, stir evenly, add absolute ethanol to fully wet the mixture, and then add the required proportion of PTFE emulsion (60%), after grinding and stirring in a mortar to form a group, place it on a film rolling machine at about 70°C and roll repeatedly until the surface becomes fibrous and then stops rolling, and the thickness is 0.1mm. to ...

Embodiment 1

[0023] Embodiment 1: With the anode that adopts above-mentioned process to make as anode, with pure aluminum plate as cathode, pole distance 2cm, hydrogen pressure 1.0MPa, electrolysis system temperature is 35 ℃, electrolyte stirring speed 1000r / min., to ① 60g.l -1 ZnH 2 SO 4 +120g.l -1 H 2 SO 4 、②60g.l -1 ZnH 2 SO 4 +180 g.l -1 h2 SO 4 、③60g.l -1 ZnH 2 SO 4 +240 g.l -1 h 2 SO 4 Electrodeposition was performed on three concentrations of electrolyte solutions, and compared with traditional lead-silver alloy anodes applied in the same electrolytic cell for electrowinning. The relationship between electrolyte system and hydrogen overvoltage see figure 1 .

[0024] The results show that the electrolyte concentration is closely related to the hydrogen overvoltage. Under the same current density, the electrolyte concentration is 60g.l -1 ZnH 2 SO 4 +180 g.l -1 h 2 SO 4 The electrolyte system has a lower overvoltage. At a current density of 1000mA / cm 2 Under c...

Embodiment 2

[0025] Embodiment 2: the anode and the cathode are the same as in embodiment 1, the hydrogen flow pressure is 1.0MPa, and the electrolyte concentration is 60g.l -1 ZnH 2 SO 4 +240g.l -1 h 2 SO 4 , The pole distance is 2cm, the temperature of the electrolytic system is 35°C, and the stirring speed of the electrolyte is 1000r / min. Using HDA hydrogen diffusion anode and traditional Pb-Ag anode, the relationship between current density and cell voltage is shown in figure 2 .

[0026] By comparing the cell voltage of the two anodes, it can be seen that under the same current density, electrolyte system, temperature and other conventional conditions, the cell voltage using HDA as the anode is significantly lower than that of the Pb-Ag anode by about 1.2V.

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Abstract

The invention provides a new method for preparing a zero anode potential hydrogen diffusion anode. In the method, a composite anode is formed by laminating a porous carbon layer, a diffusion layer, a catalyst layer and a reverse osmosis membrane layer. The porous carbon layer contains carbon black, activated carbon particles, polyvinylidene fluoride powder, and NaCl pore-forming agent; the diffusion layer contains polytetrafluoroethylene, anhydrous Na2SO4 and acetylene black; the catalytic layer contains activated carbon, acetylene black, polytetrafluoroethylene and catalyst ; The reverse osmosis membrane contains anhydrous Na2SO4 and polytetrafluoroethylene. The invention has simple preparation process, reusable catalytic layer, low preparation cost, adjustable micropores and stable and reliable anode physical and chemical properties. Compared with the traditional electrolytic deposition process, it has the characteristics of energy saving of about 40%, environmental friendliness, and no pollution; compared with the existing hydrogen diffusion anode, it has the characteristics of simple preparation process and low material cost.

Description

technical field [0001] The invention relates to a method for preparing a zero anode potential hydrogen diffusion anode, which belongs to the technical field of material preparation. Background technique [0002] When extracting metals from aqueous solutions by electrolytic deposition, such as from H 2 SO 4 -MeSO 4 -H 2 O system extracts zinc, copper, manganese, nickel, etc., and generally uses alloys (such as Pb-0.5-1%, Ag and Pb-4-12%, Sn, etc.) as insoluble anodes, and the anode reaction is an oxygen evolution process. , the energy consumption of this process accounts for 45-55% of the total electricity consumption of electrowinning. If the potential of the anode electrode is reduced to zero potential, the electrowinning process will save energy by 45-55%. [0003] Taking zinc hydrometallurgy as an example, in the electrowinning process, if the traditional alloy (Pb-Ag) anode is replaced by the new zero anode potential anode-hydrogen diffusion anode (HDA), the oxygen ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C7/02
Inventor 张家涛沈鑫远魏昶樊刚
Owner KUNMING UNIV OF SCI & TECH