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a ti 4 o 7 / ti 3 o 5 Miscible fiber electrocatalysts and their applications in oxygen reduction

An electrocatalyst and mixed-phase technology, applied in the direction of circuits, electrical components, battery electrodes, etc., can solve the problems of catalyst stability reduction, low storage, poor stability, etc., achieve high oxygen reduction catalytic activity, simple preparation method, and solve poor stability Effect

Active Publication Date: 2021-06-11
SHAANXI NORMAL UNIV
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Problems solved by technology

[0003] At present, commercial Pt / C is an ideal electrocatalyst in oxygen reduction electrocatalysts, but the low reserves of Pt (only 66000t) and high cost limit its large-scale application. Corrosion causes the dissolution and agglomeration of Pt particles, resulting in a serious reduction in catalyst activity, and the dissolution of Pt is an anode reaction, which will generate a mixed potential on the cathode, which will cause a negative shift in the reversible potential of oxygen reduction (ORR) to stabilize the catalyst. It is reported that the activity of Pt / C catalyst is reduced by 15% after 3 hours of circulation (Small 2018, 14, 1703459)
In order to solve the problems of low reserves, high cost, and poor stability of Pt in commercial Pt / C, it has been reported that the metal oxide TiO with better stability 2 、Ti 4 o 7 and Ti 3 o 5 Doping noble metals Ir, Pd, Pt, etc. (Journal of Catalysis 358 (2018) 287–294, Applied Catalysis B: Environmental 201 (2017) 419–429), but the addition of noble metals makes the oxygen reduction reaction (ORR) in the cathode The overpotential is high. In order to overcome the problem of high potential, it is necessary to increase the load of the catalyst, which leads to an increase in the reaction cost.
In addition, it has been reported that binary or ternary alloys formed by transition metals are used as electrocatalysts (J PhysChem B, 2002, 106:1869-1877p). These catalysts have higher oxygen reduction activity than commercial Pt / C, but It will poison the proton exchange membrane of the battery and affect the performance of the battery

Method used

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  • a ti <sub>4</sub> o <sub>7</sub> / ti <sub>3</sub> o <sub>5</sub> Miscible fiber electrocatalysts and their applications in oxygen reduction
  • a ti <sub>4</sub> o <sub>7</sub> / ti <sub>3</sub> o <sub>5</sub> Miscible fiber electrocatalysts and their applications in oxygen reduction
  • a ti <sub>4</sub> o <sub>7</sub> / ti <sub>3</sub> o <sub>5</sub> Miscible fiber electrocatalysts and their applications in oxygen reduction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Put 0.4g of polyvinylpyrrolidone, 8mL of absolute ethanol, 2mL of acetic acid, and 2.2857g of tetrabutyl titanate in a conical flask, and stir at room temperature for 48 hours to obtain a light yellow solution, and then add 0.5g of dopamine hydrochloride to the solution, Stirring was continued at room temperature for 24 h to obtain a dark red solution. Inject the obtained dark red solution into a 5mL syringe, apply a high voltage of 12kV through the electrospinning device, and collect the fibers at a distance of 24cm from the syringe tip on the receiving plate to obtain amorphous TiO 2 nanofibrous membrane. The resulting amorphous TiO 2 The nanofibrous membrane was placed in a high-temperature tube furnace with argon gas, and the temperature was raised from room temperature to 1000 °C at a rate of 20 °C / min, and kept for 30 min to obtain Ti 4 o 7 / Ti 3 o 5 Miscible nanofibrous electrocatalysts. Such as figure 1 As shown, the phase of the prepared material is Ti ...

Embodiment 2

[0025] Put 0.8g of polyvinylpyrrolidone, 8mL of absolute ethanol, 2mL of acetic acid, and 2.2857g of tetrabutyl titanate in a conical flask, and stir at room temperature for 48 hours to obtain a light yellow solution, and then add 0.4g of dopamine hydrochloride to the solution, Stirring was continued at room temperature for 24 h to obtain a dark red solution. Inject the obtained dark red solution into a 5mL syringe, apply a high voltage of 15kV through the electrospinning device, and collect the fibers at a distance of 24cm from the tip of the syringe on the receiving plate to obtain amorphous TiO 2 nanofibrous membrane. The resulting amorphous TiO 2 The nanofibrous membrane was placed in a high-temperature tube furnace with argon, and the temperature was raised from room temperature to 1100 °C at a rate of 35 °C / min, and kept for 30 min to obtain Ti 4 o 7 / Ti 3 o 5 Miscible nanofibrous electrocatalysts. Obtained Ti 4 o 7 / Ti 3 o 5 The diameter of the miscible nanofi...

Embodiment 3

[0027]Put 0.4g of polyvinylpyrrolidone, 8mL of absolute ethanol, 2mL of acetic acid, and 2.2857g of tetrabutyl titanate in a conical flask, and stir at room temperature for 48 hours to obtain a light yellow solution, then add 1g of dopamine hydrochloride to the solution, and Stirring was continued for 24 h to obtain a dark red solution. The obtained dark red solution was injected into a 5mL syringe, and a high voltage of 15kV was applied through an electrospinning device, and the fibers were collected on the receiving plate at a distance of 24cm from the tip of the syringe to obtain amorphous TiO 2 nanofibrous membrane. The resulting amorphous TiO 2 The nanofibrous membrane was placed in a high-temperature tube furnace with argon, and the temperature was raised from room temperature to 1000 °C at a rate of 35 °C / min, and kept for 30 min to obtain Ti 4 o 7 / Ti 3 o 5 Miscible nanofibrous electrocatalysts. Obtained Ti 4 o 7 / Ti 3 o 5 The diameter of the mixed-phase nano...

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Abstract

The invention discloses a Ti 4 O 7 / Ti 3 O 5 Preparation method of mixed-phase fiber electrocatalyst and its application in oxygen reduction, the electrocatalyst is first prepared by electrospinning TiO 2 nanofibrous membrane; then the TiO 2 The nanofiber membrane is obtained by annealing at 980-1050° C. in an inert environment. Ti of the present invention 4 O 7 / Ti 3 O 5 The preparation method of the mixed-phase fiber electrocatalyst is simple and environmentally friendly, and the diameter of the obtained nanofiber is between 150 and 500 nm. Ti of the present invention 4 O 7 / Ti 3 O 5 When the mixed-phase nanofibers are used as oxygen reduction electrocatalysts, they have high oxygen reduction catalytic activity, methanol resistance and stability, which solves the problems of poor stability and high cost of commercial Pt / C.

Description

technical field [0001] The invention belongs to the technical field of electrocatalytic oxygen reduction, and in particular relates to a preparation method of a mixed-phase titanium oxide nanofiber electrocatalyst and an application of the catalyst in oxygen reduction. Background technique [0002] Fuel cell is the fourth power generation technology after hydropower, thermal power and atomic power. From the perspective of energy saving and ecological environment protection, fuel cell is a promising power generation technology. Oxygen reduction reaction (ORR), as the preferred cathode reaction of fuel cells, plays an important role in the commercialization of various energy storage conversion systems such as fuel cells and chlor-alkali electrolysis. In the fuel cell, in order to catalyze the oxygen reduction reaction, it is necessary to select a suitable oxygen reduction catalyst, so it must have a certain chemical activity to activate oxygen, but also have a certain inertnes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/90B82Y30/00B82Y40/00
CPCY02E60/50
Inventor 孙颉史茹月王芳李妙然
Owner SHAANXI NORMAL UNIV
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