Nanosheet-structured NiFeCr composite hydroxide oxygen evolution material prepared by chemical oxidation method

A technology of composite hydroxide and nano-flakes, which is applied in the direction of electrolysis process, electrolysis components, electrodes, etc., can solve the problem that the electrochemical treatment method cannot be used in large-scale and large-scale, so as to save electrolysis energy consumption and avoid easy Shedding problem, avoid practical effect

Pending Publication Date: 2022-05-31
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of them use hydrothermal method, electrochemical treatment method, potassium permanganate / chlorine gas and sodium hypochlorite oxidation method to modify the surface, but because the hydrothermal method requires a long time and high temperature and high pressure process, the limitation of electrolytic devices such as electrolyzers The electrochemical treatment method cannot be used on a large scale and on a large scale, so we add a persulfate oxidant under alkaline conditions to carry out surface oxidation treatment under mild conditions. It is worth noting that, compared with the traditional chemical oxidation method Compared with persulfate oxidants, they are more environmentally friendly than chlorine-containing oxidants, and have stronger oxidizing ability in alkaline solution, so it is easy to form NiFeCr hydroxide with high oxygen evolution catalytic activity

Method used

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  • Nanosheet-structured NiFeCr composite hydroxide oxygen evolution material prepared by chemical oxidation method
  • Nanosheet-structured NiFeCr composite hydroxide oxygen evolution material prepared by chemical oxidation method
  • Nanosheet-structured NiFeCr composite hydroxide oxygen evolution material prepared by chemical oxidation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Cut the stainless steel fiber felt into a shape of 1cm × 1cm, ultrasonically remove the surface oil stains in absolute ethanol for 10 minutes, and then put it in 1mol L -1 The surface oxides were removed by sonication in HCl for 5 min, and finally washed with deionized water and vacuum dried for use.

[0018] (2) 0.1mol L -1 of ammonium persulfate and 5mol L -1 The mixed solution of sodium hydroxide was used as the reaction solution, the treated stainless steel fiber felt was placed in the above reaction solution, reacted at 80 °C for 45 min, the stainless steel fiber felt was taken out, washed repeatedly with deionized water, and vacuum dried to obtain a nano-sheet structure. NiFeCr composite hydroxide oxygen evolution material. The obtained electrode material is in 0.5mol L -1 Na 2 CO 3 / NaHCO 3 showed good oxygen evolution catalytic performance in 10mAcm -2 and 100mA cm -2 Only 273mV and 397mV overpotentials are required at the current density of .

Embodiment 2

[0020] Referring to the electrode preparation method of Example 1, metal oxide / hydroxide electrode materials were prepared at different concentrations of sodium hydroxide. The concentrations of sodium hydroxide were 1, 3, 5, and 7 mol L -1 , the rest of the conditions are the same as the implementation case 1. The prepared electrode material was taken out, rinsed repeatedly with deionized water, and then vacuum-dried. The obtained electrode material was 0.5 mol L. -1 Na 2 CO 3 / NaHCO 3 The catalytic performance of oxygen evolution is shown in Table 1.

[0021] Table 1 Catalytic performance for oxygen evolution of stainless steel fiber felt electrodes treated with different concentrations of sodium hydroxide

[0022]

[0023]

Embodiment 3

[0025] Referring to the electrode preparation method of Example 1, the metal oxide / hydroxide electrode material was prepared by changing the concentration of ammonium persulfate. The concentration of ammonium persulfate is 0.05mol L -1 , the rest of the conditions are the same as the implementation case 1. The prepared electrode material was taken out, rinsed repeatedly with deionized water, and dried in vacuum. The obtained electrode material is in 0.5mol L -1 Na 2 CO 3 / NaHCO 3 demonstrated good oxygen evolution catalytic performance at 10 mA cm -2 and 100mA cm -2 Overpotentials of 362 mV and 495 mV are required at the current density of .

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Abstract

The invention provides a preparation method of an electro-catalytic moisture desorption oxygen desorption catalyst in a carbonate system, and belongs to the field of chemical oxidation and electro-catalytic moisture desorption oxygen desorption. Comprising the steps that a stainless steel material containing a nickel source, an iron source and a chromium source serves as a substrate, oil stains and oxides on the surface of the stainless steel material are removed, then the stainless steel material reacts in an alkaline solution containing a persulfate oxidizing agent at the temperature of 20-110 DEG C for 0.25-3 h, a product is taken out, washed to be clean and then subjected to vacuum drying, and the NiFeCr composite hydroxide oxygen evolution material with the nanosheet structure is obtained. The electrode can greatly reduce the oxygen evolution overpotential for catalyzing water decomposition in a carbonate system, a test result shows that the electrode treated by adopting a potassium persulfate oxidizing agent has excellent oxygen evolution catalytic performance, and the oxygen evolution overpotential is 263 mV and 384 mV respectively when the current density is 10 mA cm <-2 > and 100 mA cm <-2 > in 0.5 mol L <-1 > Na2CO3/NaHCO3. The stainless steel substrate used in the method is cheap and easy to obtain, the treatment method is simple and easy to operate, conditions are mild, and the method is suitable for large-scale production.

Description

technical field [0001] The invention prepares an anode material with excellent electrocatalytic performance through simple and rapid chemical oxidation treatment, which is used for electrocatalytic water splitting in a carbonate system. Background technique [0002] The depletion of traditional fossil fuels and the pollution to the environment make people need to find a sustainable energy source such as hydrogen to replace traditional fossil fuels. Among all the current hydrogen production processes, the method of electrocatalytic water splitting for hydrogen production is favored by researchers because of its high efficiency and no pollution. Compared with traditional electrolytes, the electrolytic carbonate system can generate not only hydrogen and oxygen, but also sodium hydroxide and bicarbonate products, which are used in industry, but because the oxygen evolution reaction involves a four-electron transfer process. , the oxygen evolution kinetics in the carbonate syste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/091C25B1/04
CPCC25B1/04Y02E60/36
Inventor 孙艳芝常翠萍潘军青陈咏梅
Owner BEIJING UNIV OF CHEM TECH
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