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Composite material and catalyst supported by composite material and its preparation and application

A technology of composite materials and catalysts, applied in the direction of catalyst carriers, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as poor conductivity, small specific surface area, and complicated preparation methods

Active Publication Date: 2020-10-09
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Qing Lv et al. TiO 2 Nanoparticles and carbon black are ultrasonically dispersed and mixed, immersed in ethylene glycol solution of chloroplatinic acid, and Pt / TiO is prepared by ultrasonic irradiation. 2 -C electrocatalyst, compared with Pt / C electrocatalyst, has improved activity and stability (J.Power Sources,2012,218:93), but the nanoparticle-shaped support has poor conductivity and small specific surface area
Subsequently, Xu-Lei Sui et al. used TiO 2 The mixed system of nanotubes (TNTs) and carbon powder prepares Pt / C-TNTs electrocatalysts, which further improves the activity and stability (J.Power Sources, 2014, 255:43.), but the preparation method is relatively complicated and requires first The Ti foil is degreased, then anodized by the two-electrode system, and then TNTs are obtained by high-temperature calcination, and then TNTs and carbon black are ultrasonically dispersed, and then Pt is introduced into the Pt salt solution of ethylene glycol by microwave radiation.

Method used

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  • Composite material and catalyst supported by composite material and its preparation and application
  • Composite material and catalyst supported by composite material and its preparation and application
  • Composite material and catalyst supported by composite material and its preparation and application

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Embodiment 1

[0028]Weigh 0.2g of carbon powder (XC-72R carbon powder) and ultrasonically disperse it in 8g of ethanol, then add it to the ethanol solution of polyvinylpyrrolidone (the content of polyvinylpyrrolidone is 7.4wt.%), stir while ultrasonically, and then add 2g of acetic acid, then add 1g of butyl titanate, stir for 2 hours to get a black spinning solution, put it into a syringe after static defoaming, and then fix it on the electrospinning workbench, the distance between the workbench and the roller or stainless steel plate The feeding speed of the spinning solution is 0.02mm / min, the working voltage of 20kV is applied, and the aluminum foil is fixed on the roller to collect the fibers. The rotation speed of the roller is 120rpm, or 100-300rpm. Finally, the fibers were removed from the aluminum foil paper, put into a muffle furnace and calcined at 400°C for 4 hours to obtain titanium oxide-carbon (TiO 2 -C) Nanofibers. figure 1 For the prepared TiO 2 -SEM image of C.

[0029]...

Embodiment 2

[0031] One-step preparation of TiO by electrospinning 2 -C-Pt electrocatalyst: Weigh 0.2g of carbon powder (XC-72R carbon powder) and ultrasonically disperse it in 10g of ethanol, then add it to the ethanol solution of polyvinylpyrrolidone (the content of polyvinylpyrrolidone is 10wt.%). Stir while ultrasonic, then add 2 g of acetic acid, then add 1 g of butyl titanate, stir for 2 hours, then add 0.15 g of chloroplatinic acid ethanol solution (the concentration of chloroplatinic acid solution is 0.15 g / mL) dropwise to the above black solution In the final spinning solution is obtained. Subsequently, the spinning solution was left to defoam and then moved into a syringe for electrospinning, as in Example 1, and finally the obtained fibers were put into a muffle furnace for 350°C for 2 hours, and the Ti salt and the Pt salt were decomposed while the polymer was decomposed. decomposed into TiO 2 and Pt, and finally get TiO 2 -C-Pt electrocatalysts. Figure 4 The XRF character...

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Abstract

The invention relates to a composite material and a catalyst with the composite material as a carrier and its preparation and application. Specifically, it is based on electrospinning technology and solution method to prepare composite fiber / MO based on metal oxide-conductive material. 2 ‑C and its electrocatalyst N / MO as a carrier 2 -C. Its electrocatalyst carrier / MO 2 ‑C is a metal oxide‑conductive carbon material composite fiber. The introduction of the catalyst Pt can be done by dispersing the catalyst carrier into the solution and then introducing the Pt catalyst particles by reduction method, or by adding a Pt salt precursor to the spinning solution, and then a one-step method Preparation of Pt-based electrocatalysts. Through the addition of conductive carbon materials and the one-step low-temperature treatment of polymer nanofibers in the later stage, the present invention not only ensures the loose porous structure of the prepared carrier, but also ensures the conductivity and structural stability of the carbon material in the carrier. In addition, air or The one-step low-temperature treatment under an oxygen atmosphere not only ensures the oxidation of the metal precursor salt, but also ensures the decomposition of the polymer precursor and the stable existence of the carbon material.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a composite material and a catalyst supported by the composite material and its preparation and application. Background technique [0002] Pt is currently the most common electrocatalyst for proton exchange membrane fuel cells, among which carbon-supported Pt (Pt / C) is the most widely used, but the interaction between Pt nano-ions and carbon supports is weak, and carbon supports in It is easy to corrode under high temperature, strong acid and strong electric field, which seriously affects the long-term operation stability of fuel cells. [0003] To alleviate these problems, catalysts are usually prepared using novel supports. Metal oxides, especially low d-electron metal oxides such as TiO 2 and CeO 2 etc., in addition to having excellent electrical / chemical stability and acid and alkali corrosion resistance, it also shows a catalytic increase effect, and there is a strong ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00B01J23/42B01J35/06B01J35/10H01M4/92
CPCH01M4/925H01M4/926B01J23/42B01J35/58B01J35/60Y02E60/50
Inventor 孙公权李印华王素力
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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