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A preparation method and application of wood airgel for oxygen and hydrogen production by alkaline seawater electrolysis

An aerogel and wood technology, which is applied in electrolysis components, electrolysis process, electrodes, etc., can solve the problems of insufficient activity of full electrolysis bifunctional catalysts, catalyst poisoning, etc.

Active Publication Date: 2022-02-11
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of insufficient activity of the fully electrolytic bifunctional catalyst in alkaline seawater, the precipitation of insoluble magnesium hydroxide / calcium hydroxide and some interfering ions from seawater to the electrode surface, thereby poisoning the OER / HER catalyst, And provide a kind of preparation method and application of wood aerogel for oxygen production and hydrogen production by alkaline seawater electrolysis

Method used

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  • A preparation method and application of wood airgel for oxygen and hydrogen production by alkaline seawater electrolysis
  • A preparation method and application of wood airgel for oxygen and hydrogen production by alkaline seawater electrolysis
  • A preparation method and application of wood airgel for oxygen and hydrogen production by alkaline seawater electrolysis

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specific Embodiment approach 1

[0036] Specific Embodiment 1: In this embodiment, a method for preparing wood airgel for alkaline seawater electrolysis to produce oxygen and hydrogen is completed according to the following steps:

[0037] 1. First remove lignin and hemicellulose from natural porous wood, then wash, and finally freeze-dry to obtain wood airgel from which lignin and hemicellulose have been removed;

[0038] 2. Immerse the wood airgel with lignin and hemicellulose removed in NaBH 4 / NaOH mixed solution for activation to obtain activated wood airgel;

[0039] 3. Immerse the activated wood airgel in the plating solution for plating, take it out and dry it in vacuum to obtain the wood airgel loaded with nickel-molybdenum-phosphorus alloy;

[0040] The plating solution described in the step 3 is made of NiSO 4 ·6H 2 O, Na 2 MoO 4 .2H 2 O, NaH 2 PO 2 ·H 2 O, CH 3 COONa, C 6 h 5 Na 3 o 7 2H 2 O, NH 3 ·H 2 O mixed with water;

[0041] 4. Putting the wood airgel loaded with nickel-mol...

specific Embodiment approach 2

[0047] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is: the method for removing lignin and hemicellulose of natural porous wood in step 1 is: first, immerse the natural porous wood in a temperature of 90°C to 100°C. NaOH and Na 2 SO 3 8h~10h in the mixed solution, then immersed in the NaOH solution at a temperature of 70°C~80°C for 6h~8h, and finally immersed in 40°C~60°C H 2 o 2 1h~3h in the solution. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0048] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: NaOH and NaOH described in step one 2 SO 3 The concentration of NaOH in the mixed solution is 80g / L~100g / L, NaOH 2 SO 3 The concentration of the NaOH solution is 40g / L~50g / L; the mass fraction of the NaOH solution is 5%~8%; the H 2 o 2 The concentration of the solution is 65g / L-85g / L. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a preparation method and application of wood aerogel for alkaline seawater electrolysis to produce oxygen and hydrogen, and relates to a preparation method and application of wood aerogel. The purpose of the present invention is to solve the problem of insufficient activity of the all-electrolytic bifunctional catalyst in alkaline seawater, insoluble magnesium hydroxide / calcium hydroxide and some interfering ions precipitate from seawater to the electrode surface, thereby poisoning the OER / HER catalyst. Methods: 1. removing lignin and hemicellulose of natural porous wood; 2. activating; 3. immersing the activated wood airgel in a plating solution for plating; 4. etching and activating; 5. drying in vacuum. Wood airgel for oxygen and hydrogen production by electrolysis of alkaline seawater is used for full electrolysis of oxygen and hydrogen in alkaline seawater. The invention can obtain a wood aerogel used for alkaline seawater electrolysis to produce oxygen and hydrogen.

Description

technical field [0001] The invention relates to a preparation method and application of wood airgel. Background technique [0002] Hydrogen production by electrolysis of water is one of the production routes for green and sustainable hydrogen fuels, however, many water electrolyzers containing alkaline or acidic electrolytes are prepared from fresh water, and the shortage of fresh water resources is worsening, which seriously hinders more advanced water separation. Craft development. In contrast, our planet is rich in sea water and also contributes to the ionic conductivity of the electrolyte due to the abundance of dissolved salts. Therefore, the direct electrolysis of seawater, instead of freshwater, is very beneficial and promising. However, the main problem of seawater splitting technology lies in the competition between oxygen evolution reaction (OER) and chlorine evolution reaction (CER) at the anode. Under alkaline conditions, chloride ions are easily converted to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/054C25B11/069C25B11/091C25B1/04
CPCC25B1/04Y02E60/36
Inventor 惠彬陈洪姣杨东江夏延致李坚邹译慧张克伟
Owner QINGDAO UNIV
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