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Quenching modification method for improving electrocatalytic property of metal oxide, prepared metal oxide electrocatalyst and application

A technology for the electro-catalytic performance of oxides, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, fuel cell-type half-cells and primary battery-type half-cells, etc. Catalytic performance improvement, complex synthesis steps, resource consumption and other problems, to achieve the effect of improving electrocatalytic activity, good ORR performance, and low cost

Active Publication Date: 2020-04-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned modification methods all involve relatively complex synthesis steps, which are cumbersome, and even require high-temperature calcination again, which consumes resources, and the electrocatalytic performance needs to be improved.

Method used

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  • Quenching modification method for improving electrocatalytic property of metal oxide, prepared metal oxide electrocatalyst and application
  • Quenching modification method for improving electrocatalytic property of metal oxide, prepared metal oxide electrocatalyst and application
  • Quenching modification method for improving electrocatalytic property of metal oxide, prepared metal oxide electrocatalyst and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] (1) Add 2.622 g ammonium molybdate, 4.362 g nickel nitrate and 0.45 g urea into a 100 ml reaction kettle, then add 70 ml deionized water, stir for 30 minutes, and then react at 160 °C for 12 h. After cooling, the powder was separated with a centrifuge, washed alternately with deionized water and ethanol, and then dried under vacuum at 60 °C to obtain NiMoO 4 Precursor.

[0072] (2) Take 200 mg NiMoO 4 The precursor was placed in a muffle furnace, and the temperature was raised to 500 °C at a heating rate of 5 °C / min and kept constant for 2 h, then the powder was quickly taken out and placed in a container containing 1 M Fe(NO 3 ) 3 In the ice water solution, the Fe(NO 3 ) 3 The temperature of the ice-water solution was 0 °C and stirred for 1 h at a stirring rate of 700 rpm. Suction filtration was then performed to separate the powder, washed with a large amount of deionized water, and finally air-dried at 60°C, and recorded as NMO-Fe-1.

[0073] (3) The working el...

Embodiment 2

[0076] (1) Add 2.622 g ammonium molybdate, 4.362 g nickel nitrate and 0.45 g urea into a 100 ml reaction kettle, then add 70 ml deionized water, stir for 30 minutes, and then react at 160 °C for 12 h. After cooling, the powder was separated with a centrifuge, washed alternately with deionized water and ethanol, and then dried under vacuum at 60 °C to obtain NiMoO 4 Precursor.

[0077] (2) Take 200 mg NiMoO 4 The precursor was placed in a muffle furnace, and the temperature was raised to 500 °C at a heating rate of 5 °C / min and kept constant for 2 h, then the powder was quickly taken out and placed in a container containing 1 M Co(NO 3 ) 2 In the ice water solution, the Co(NO3 ) 2 The temperature of the ice-water solution was 0 °C and stirred for 1 h at a stirring speed of 700 rpm. Suction filtration was then performed to separate the powder, washed with a large amount of deionized water, and finally air-dried at 60°C, and recorded as NMO-Co-1.

[0078] (3) The working ele...

Embodiment 3

[0080] (1) Add 2.622 g ammonium molybdate, 4.362 g nickel nitrate and 0.45 g urea into a 100 ml reaction kettle, then add 70 ml deionized water, stir for 30 minutes, and then react at 160 °C for 12 h. After cooling, the powder was separated with a centrifuge, washed alternately with deionized water and ethanol, and then dried under vacuum at 60 °C to obtain NiMoO 4 Precursor.

[0081] (2) Take 200 mg NiMoO 4 The precursor was placed in a muffle furnace, and the temperature was raised to 500 °C at a heating rate of 5 °C / min and kept constant for 2 h, then the powder was quickly taken out, and placed in a 0.1 M Cr(NO 3 ) 3 In the ice water solution, the Cr(NO 3 ) 3 The temperature of the ice-water solution was 0 °C and stirred for 1 h at a stirring rate of 700 rpm. Suction filtration was then performed to separate the powder, washed with a large amount of deionized water, and finally air-dried at 60°C, and recorded as NMO-Cr-0.1.

[0082] (3) The working electrode was prep...

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Abstract

The invention discloses a quenching modification method for improving the electro-catalytic property of a metal oxide and application. The method comprises the following steps: calcining a synthesizedmetal oxide precursor at a high temperature, rapidly taking out the calcined metal oxide precursor, and rapidly cooling the calcined metal oxide precursor in an ice salt solution with a certain concentration; the method provided by the invention not only can dope metal ions into the metal oxide, but also can perform structure modification on the surface of the metal oxide. Through doping of the metal ions, the valence state of elements in the catalyst is changed, surface adsorption of oxygen is facilitated, and deprotonation of OOH is promoted; meanwhile, different crystal structures are arranged on the surface of the catalyst, so that the catalyst has lower crystallinity and more defects. Electrochemical tests show that the metal oxide catalyst prepared on the basis of the quenching modification method has good electrocatalytic performance, reduces overpotential and has good catalytic stability. Meanwhile, the method is simple in process, low in cost, wide in application range and beneficial to promoting the manufacturing development of the electrocatalyst.

Description

technical field [0001] The invention relates to the field of manufacturing process modification of metal catalysts, in particular to a quenching modification method for improving the electrocatalytic performance of metal oxides, the prepared metal oxide electrocatalyst and its application. Background technique [0002] The growing concern about the energy crisis and environmental pollution issues has prompted an urgent search for renewable energy alternatives to fossil fuels, and accordingly, efficient energy storage devices have been explored. Among various energy storage devices, rechargeable metal-air batteries are an ideal and promising electrochemical energy storage device (Wang S, Qin J, Meng T, et al. Metal–organic framework-induced construction of actiniae- like carbon nanotube assembly as advanced multifunctional electrocatalysts for overall watersplitting and Zn-air batteries[J]. Nano Energy, 2017, 39: 626-638.). However, the efficiency of oxygen evolution (OER) a...

Claims

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Application Information

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IPC IPC(8): B01J23/883B01J23/882B01J23/887B01J23/889B01J23/75B01J23/755B01J23/86H01M4/88H01M4/90H01M12/06C25B1/04C25B11/06
CPCB01J23/883B01J23/882B01J23/8878B01J23/8898B01J23/75B01J23/755B01J23/864B01J23/002H01M4/8885H01M4/9016H01M12/06C25B1/04B01J2523/00C25B11/095B01J35/33B01J2523/68B01J2523/842B01J2523/847B01J2523/845B01J2523/67B01J2523/72Y02E60/36
Inventor 丘勇才叶常春陈覃
Owner SOUTH CHINA UNIV OF TECH
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