FeCo/MXene compound, and preparation method and application thereof

A compound and sediment technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve problems such as high overpotential, poor durability, scarce supply, etc., and achieve simple, safe and good operation Catalytic effect, effect of cheap material

Active Publication Date: 2019-05-03
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, to drive the charge transfer process through the use of highly efficient electrocatalysts, the high overpotential and slow kinetics need to be overcome.
Noble metal oxides (such as RuO 2 , IrO 2 ) represent one of the most active OER catalysts, but the disadvantages of higher cost, scarce supply, and poor durability cannot be ignored

Method used

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  • FeCo/MXene compound, and preparation method and application thereof
  • FeCo/MXene compound, and preparation method and application thereof
  • FeCo/MXene compound, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) FeCo / MXene composite (FeCo / Ti 3 C 2 ) preparation

[0032] Including the following steps:

[0033] 1. MXene (Ti 3 C 2 ) preparation:

[0034] 1) Weigh 2g Ti in a 50mL centrifuge tube 3 AlC 2 , slowly added 30 mL of 40% HF, stirred at room temperature for 48 h, centrifuged the obtained reaction solution (3500 rpm, 10 min), and discarded the supernatant. Add 40 mL of deionized water to the sediment in the centrifuge tube, shake it by hand to mix the sediment and deionized water evenly, put the centrifuge tube into a high-power ultrasonic machine for ultrasonic dispersion (750W, 10min), take it out and continue centrifuging (3500rpm, 10min) discard the supernatant, repeat several times, until the pH value of the supernatant poured out after centrifugation is above 5, preferably, the pH value is 5-7, and the final precipitate is obtained.

[0035] 2) Add 40 mL of ethanol to the final precipitate in the centrifuge tube obtained in step 1), ultrasonically disperse...

Embodiment 2

[0048] Effect of Coating Different Compounds on Electrocatalytic Anodic Water Oxidation

[0049] (1) Preparation of catalyst

[0050] 1. The present invention - FeCo / Ti 3 C 2 Composite: get the product prepared in Example 1

[0051] 2. Comparative example - FeCo composite: Weigh 0.1212g Fe(NO 3 ) 3 9H 2 O, 0.0873gCo(NO 3 ) 2 ·6H 2 O and 1.8g urea, add 2mL of deionized, ultrasonically dissolved, pour into a Shleck bottle, under the protection of nitrogen, heat and stir at 100°C for 5h; put the obtained reactant into a centrifuge tube, centrifuge (10000 rpm, 10min) three times, and water Wash repeatedly. Put it into a freeze dryer to freeze to obtain a powdery substance, which is FeCo hydroxide compound.

[0052] (2) Electrode preparation

[0053] Take 4mg FeCo / Ti respectively 3 C 2 Composite powder, few layers of Ti 3 C 2 Add 485 μl of deionized water, 500 μl of absolute ethanol and 10 μl of Nafion to the powder and FeCo hydroxide complex, respectively, ultrasoni...

Embodiment 3

[0058] Different Fe(NO 3 ) 3 9H 2 O and Co(NO 3 ) 2 ·6H 2 The effect of the molar ratio of O species on electrocatalytic anodic water oxidation (1) Catalyst preparation

[0059] 1. Few layers of Ti 3 C 2 The preparation of powder: with embodiment 1.

[0060] 2. FeCo / Ti 3 C 2 Preparation of complex

[0061] 1) Weigh 5mg of few-layer Ti 3 C 2 powder, add 500 μL of deionized water, after ultrasonic dispersion, add 2 mL of N-methylpyrrolidone as a stabilizer, continue ultrasonic dispersion, and obtain few layers of Ti 3 C 2 Dispersions.

[0062] 2) Weigh Fe(NO 3 ) 3 9H 2 O and Co(NO 3 ) 2 ·6H 2 O and 1.8g urea, add 2mL deionized, ultrasonically dissolved.

[0063] Table 1

[0064] ratio of substances

1:2

1:3

2:1

3:1

1:1

Fe(NO 3 ) 3 .9H 2 o / g

0.1212

0.1212

0.2424

0.3636

0.1212

Co(NO 3 ) 2 .6H 2 o / g

0.1746

0.2619

0.0873

0.0873

0.0873

[0065] 3) Mix the solution obtain...

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PUM

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Abstract

The invention discloses a FeCo/MXene compound, and a preparation method and application thereof. The method comprises the following steps: taking a MAX phase of a ternary stratified material as a rawmaterial, and repeatedly carrying out washing and centrifuging by an etching method to obtain multi-layer MXene in the lower-layer liquid and obtain few-layer MXene in the upper layer liquid; and mixing water solutions of ferric salt, cobalt salt and urea with a dispersion liquid of the few-layer MXene, carrying out heating under protection of nitrogen, carrying out stirring for reacting, and centrifuging and washing the obtained reactant to obtain the FeCo/MXene compound. The method for preparing the MXene has the advantages that operation is simple and safe, a glassy-carbon electrode supporting the FeCo/MXene compound is used as a working electrode to research a process of electrocatalysis of anode water oxidation, the initial potential is low, and the catalytic effect is good.

Description

technical field [0001] The invention belongs to the field of electrocatalytic water splitting, in particular, FeCo / MXene composites are obtained by loading iron-cobalt bimetal on two-dimensional layered MXene, which can improve the water oxidation effect of electrocatalytic anodes. Background technique [0002] With the rapid depletion of fossil fuels and the worsening of environmental pollution, how to realize the effective conversion of renewable energy has become an important and urgent problem for scientists to solve. Among various energy conversion approaches, electrocatalysis is a common and effective energy conversion method, which converts renewable electrical energy into chemical energy. This energy conversion method plays an important role in solving the current energy crisis. The oxygen evolution reaction (OER) is a bottleneck step in many important renewable energy applications, such as water splitting and metal-air batteries. However, the high overpotential and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/22C25B1/04C25B11/06
CPCY02E60/36
Inventor 姜毅田明夏立新
Owner LIAONING UNIVERSITY
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