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Manganite/metalloporphyrin compound layered sandwich nanometer material suitable for electrocatalysis water oxidation

A metalloporphyrin, manganese oxide technology, applied in the direction of organic compound/hydride/coordination complex catalyst, chemical/physical process, physical/chemical process catalyst, etc., can solve the problem of limited application, poor cycle performance, electrical conductivity low problems, to achieve the effect of low price, simple process and no pollution, and improved electrocatalytic activity

Inactive Publication Date: 2019-01-04
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, δ-MnO 2 Due to low conductivity and poor cycle performance, its wide application is limited

Method used

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  • Manganite/metalloporphyrin compound layered sandwich nanometer material suitable for electrocatalysis water oxidation
  • Manganite/metalloporphyrin compound layered sandwich nanometer material suitable for electrocatalysis water oxidation
  • Manganite/metalloporphyrin compound layered sandwich nanometer material suitable for electrocatalysis water oxidation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 1.35g MnSO 4 ·H 2 O and 3.0EDTA-2Na were dissolved in deionized water and stirred for 30 min to obtain a white suspension solution called Sa. Dissolve 1.2g NaOH in 50ml deionized water and stir until completely dissolved, called Sb. Under rapid stirring, slowly drop Sb into Sa, continue to stir for 2 hours after the dropwise addition, filter the precipitate, wash with deionized water several times, and then place it in a vacuum oven at 40°C for 12 hours to finally obtain the birnessite type δ -MnO 2 The test results of powder (XRD, IR, SEM are respectively as figure 2 , image 3 , Figure 4 ). Weigh 2g of birnessite type δ-MnO 2 with 300ml 1mol / L HNO 3 The solution was mixed and stirred at room temperature for 12 hours, filtered with suction, washed to neutrality, dried at 70°C, and ground to obtain acidified birnessite-type δ-MnO without alkali metal ions 2 (XRD, IR test results such as figure 2 , image 3 ). Weigh 1g of birnessite-type δ-MnO after ...

Embodiment 2

[0030] Weigh 2.7MnSO 4 ·H 2 O and 6.0 EDTA were dissolved in deionized water and stirred for 30 min to obtain a white suspension solution called Sa. Dissolve 2.4g KOH in 50ml deionized water and stir until completely dissolved, called Sb. Under rapid stirring, slowly drop Sb into Sa, continue to stir for 2 hours after the dropwise addition, filter the precipitate, wash with deionized water several times, and then place it in a vacuum oven at 40°C for 12 hours. The final product: birnessite Type δ-MnO 2 powder. Weigh 4g of birnessite type δ-MnO 2 Mix with 300ml 2mol / L HCl solution, stir at room temperature for 8 hours, filter with suction, wash the precipitate to neutrality, dry at 70°C, grind, and finally obtain acidified birnessite-type δ-MnO without alkali metal ions 2 . Weigh 1g of birnessite-type δ-MnO after acidification 2 , disperse it in 120ml of deionized water, then add 30ml of tetraethylammonium hydroxide, stir at room temperature for 48h, centrifuge the mixed...

Embodiment 3

[0034] Weigh 3.2MnSO 4 ·H 2 O and 4.8 sodium citrate were dissolved in deionized water, and stirred for 30 minutes to obtain a white suspension solution, called Sa. Dissolve 2.9g LiOH in 50ml deionized water and stir until completely dissolved, called Sb. Under rapid stirring, slowly drop Sb into Sa, continue to stir for 2 hours after the dropwise addition, filter the precipitate, wash with deionized water several times, and then place it in a vacuum oven at 40°C for 12 hours. The final product: birnessite Type δ-MnO 2 powder. Weigh 2g of birnessite type δ-MnO 2 with 300ml 1mol / L HNO 3 The solution was mixed and stirred at room temperature for 12 hours, filtered with suction, washed to neutrality, dried at 70°C, and ground to obtain acidified birnessite-type δ-MnO without alkali metal ions 2 . Weigh 1g of birnessite-type δ-MnO after acidification 2 , dispersed it in 120ml of deionized water, then added 20ml of triethanolamine, stirred at room temperature for 72h, centr...

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Abstract

The invention discloses a preparing method of a manganite / metalloporphyrin compound layered sandwich nanometer material suitable for electrocatalysis water oxidation, and belongs to the field of photoelectrocatalysis decomposition water hydrogen production catalysis materials. The preparing method includes the steps of synthesizing high-purity birnessite type delta-MnO2 through a complexing agent,and stripping into a single-layer birnessite type delta-MnO2 sheet; synthesizing amine porphyrin with electropositivity and placing the sheet and the amine porphyrin in a flask to be mixed and recombined into the novel layered sandwich structure nanometer conductive compound catalysis material. The obtained material presents excellent electrocatalysis water oxidization (OER) performance, the electric potential is kept at 0.91 V when the electric current density is 5 mA cm<-2> and is much increased compared with birnessite type delta-MnO2, the duration reaches 4000 s under the condition of thelarge electric current density of 10 mA cm<-2>, and quite high stability can be kept.

Description

technical field [0001] The invention relates to a preparation method and application performance of a manganese oxide / metal porphyrin composite layered sandwich nanomaterial suitable for electrocatalytic water oxidation. Background technique [0002] With the development of economy and society, human beings' demand for energy continues to increase, and traditional energy sources such as coal, oil, and natural gas are becoming increasingly exhausted. Efficient, clean, and renewable new energy sources have attracted great attention from all over the world. Among many hydrogen production technologies, using solar energy to split water into hydrogen is the best way. This process requires a large number of electrons and protons as reducing agents. The water oxidation process can provide sufficient electrons and protons for this process. Therefore, the water oxidation process is a key step in hydrogen production technology. However, there are thermodynamic unfavorable condition...

Claims

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Application Information

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IPC IPC(8): B01J31/32C25B1/04C25B11/06
CPCC25B1/04C25B11/04B01J31/32B01J35/33Y02E60/36
Inventor 阳卫军刘凡王黎明
Owner HUNAN UNIV
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