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Compound metal oxide water oxidation catalyst and electrostatic spinning preparation method thereof

A composite oxide, electrospinning technology, applied in the preparation of electrospinning technology, amorphous composite metal oxide water oxidation catalyst field, can solve the problem of low abundance, unstable catalytic activity, and limit the practical application of water oxidation catalyst and other problems, to achieve the effects of stable catalytic activity, excellent electrocatalytic water oxidation activity, and simple and easy technology.

Inactive Publication Date: 2015-03-11
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the most active solid-state water oxidation catalysts are noble metal oxides of ruthenium and iridium, which have extremely low abundance on the earth, and chemical decomposition will occur during the catalytic process of water oxidation, resulting in unstable catalytic activity (J.Am. Chem.Soc.,2014,136,7077-7084), thus limiting its practical application as a water oxidation catalyst

Method used

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  • Compound metal oxide water oxidation catalyst and electrostatic spinning preparation method thereof
  • Compound metal oxide water oxidation catalyst and electrostatic spinning preparation method thereof
  • Compound metal oxide water oxidation catalyst and electrostatic spinning preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 1 g of polyvinylpyrrolidone (PVP) into 10 mL of ethanol and 3 mL of DMF mixed solvent, and stir at room temperature for 30 min until the PVP is completely dissolved and becomes a colorless transparent solution. Under stirring, 0.5 mmol of nickel nitrate hexahydrate and 1 mmol of iron acetylacetonate were sequentially added, and stirred at room temperature for 12 hours to obtain a uniform solution. Pour the solution into a 5mL syringe, the inner diameter of the needle is 0.41mm, the aluminum foil is used as the cathode receiving plate, and the nanofiber product is collected, the distance between the aluminum foil and the two pole plates of the needle is 22cm, the applied voltage is 23kV, the temperature is 25°C, and the humidity is 20% , followed by electrospinning, and nanofiber precursors were obtained on the receiving plate after 25 h. The nanofiber precursor was dried at 70° C. for 24 hours, and the obtained dry nanofiber precursor was calcined at 250° C. for 3 h...

Embodiment 2

[0030] Same as Example 1, just change the quality of iron acetylacetonate into 0.5mmol. The electrocatalytic performance of the obtained sample: under alkaline conditions, the current density of the electrode made of this material reaches 10mA / cm 2 , its overpotential is 341mV.

Embodiment 3

[0032] Same as Example 1, just change the quality of iron acetylacetonate into 0.25mmol. The electrocatalytic performance of the obtained sample: under alkaline conditions, the current density of the electrode made of this material reaches 10mA / cm 2 , its overpotential is 373mV.

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Abstract

The invention discloses a compound metal oxide water oxidation catalyst and a preparation method thereof adopting an electrostatic spinning technology, and belongs to the technical field of electrocatalyst synthesis. The preparation method of the compound metal oxide water oxidation catalyst comprises the steps of preparing a nanometer fiber precursor by using an electrostatic spinning technology, and performing calcination processing on the preparing nanometer fiber precursor, so as to obtain an amorphous compound metal oxide nano-fiber, wherein the molar ratio of indispensable metallic elements to auxiliary metallic elements is 2:(1-10), and the indispensable metallic elements and the auxiliary metallic elements are not the same; the indispensable metallic elements are iron, cobalt, nickel or manganese, and the auxiliary metallic elements are iron, cobalt, nickel, manganese, copper, zinc, calcium, magnesium, barium, strontium, lanthanum, chromium, molybdenum, gallium or cerium; the catalyst has excellent electrocatalysis water oxidation activity in a strong alkaline solution with the pH value of 14, is equivalent to a noble metal IrOx / C in catalytic property, and has stable catalytic activity. The electrostatic spinning technology adopted by the invention is simple, convenient, feasible, low in price, efficient, excellent in controllability and repeatability, and suitable for larger-scale preparation.

Description

technical field [0001] The invention belongs to the technical field of electrocatalyst synthesis, and in particular relates to an amorphous composite metal oxide water oxidation catalyst and its preparation method using electrostatic spinning technology. Background technique [0002] With the rapid expansion of the global economy, energy demand is also increasing. At present, non-renewable fossil fuels such as oil, coal, and natural gas are still the main energy sources. However, the non-renewability of these fuels, the environmental pollution caused by combustion, and the severe impact on the climate cannot be ignored. For the sustainable development of mankind, people pay more and more attention to the development and utilization of economical and clean new energy. Hydrogen energy is known as the ultimate clean energy for mankind and will play an important role in the future energy landscape. Water is the most abundant renewable "hydrogen source" on earth, and water spl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/08D01F9/10D01D5/00B01J23/755C25B11/06
Inventor 李国栋周丽景邹晓新樊梅红陈辉
Owner JILIN UNIV
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