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A kind of carbon black supported highly ordered ptco intermetallic compound and its synthesis method and application

A technology of intermetallic compounds and synthesis methods, applied in the field of nanometers, can solve the problems of high cost and scarcity, insufficient activity, degradation, etc., and achieve the effect of excellent stability and catalytic redox activity

Active Publication Date: 2022-07-15
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high cost and scarcity of Pt are the main obstacles to its widespread application
In PEMFC, Pt catalysts often suffer from insufficient activity and degradation problems under high potential and oxidative acidic environment

Method used

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  • A kind of carbon black supported highly ordered ptco intermetallic compound and its synthesis method and application
  • A kind of carbon black supported highly ordered ptco intermetallic compound and its synthesis method and application
  • A kind of carbon black supported highly ordered ptco intermetallic compound and its synthesis method and application

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preparation example Construction

[0030] The invention provides a method for synthesizing a carbon black-supported highly ordered PtCo intermetallic compound, comprising the following steps:

[0031] A) disperse cobalt salt, platinum salt and carbon black in a solvent to obtain a suspension;

[0032] B) After removing the solvent from the suspension, perform high-temperature annealing and slow cooling in sequence to obtain a highly ordered PtCo intermetallic compound supported on carbon black. The temperature of the high-temperature annealing is 900-1100° C. The cooling rate of 1.1~1.3℃ / min will reach 550~650℃, and then cool down naturally.

[0033] In the present invention, cobalt salt, platinum salt and carbon black are first dispersed in a solvent to obtain a suspension. Wherein, the cobalt salt is selected from Co(NO 3 ) 2 ·6H 2 O or CoCl 2 ·6H 2 O, the platinum salt is selected from H 2 PtCl 4 ·6H 2 O.

[0034] The Co(NO 3 ) 2 ·6H 2 O or CoCl 2 ·6H 2 O and H 2 PtCl 4 ·6H 2 The molar rati...

Embodiment 1

[0053] a. 50g commercial carbon black BP2000, 14.7mg H 2 PtCl 4 ·6H 2 O and 10.8 mg Co(NO 3 ) 2 ·6H 2 O was mixed with 50 mL of absolute ethanol, immersed and stirred, and the solvent was removed by a rotary evaporator to obtain a uniformly mixed precursor powder;

[0054] b. After drying the precursor powder in a transfer oven, transfer it to a quartz crucible, put it into a tube furnace, and under a protective atmosphere of 5% hydrogen and 95% argon, raise the powder precursor to a temperature of 5°C / min. 1000 °C for 2 h; then drop to 600 °C at a slow cooling rate of 1.1 °C / min, and then naturally cool to room temperature to obtain a highly ordered PtCo intermetallic compound.

[0055] The PtCo intermetallic compounds obtained above are characterized, and the results are shown in Figure 1 to Figure 4 , figure 1 It is a common TEM picture of the PtCo intermetallic compound prepared in Example 1 of the present invention. The TEM picture shows that the PtCo intermetalli...

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Abstract

The invention provides a method for synthesizing a carbon black-supported highly ordered PtCo intermetallic compound, which comprises the following steps: A) dispersing cobalt salt, platinum salt and carbon black in a solvent to obtain a suspension; B) dispersing the After removing the solvent from the suspension, perform high-temperature annealing and slow cooling in sequence to obtain a highly ordered PtCo intermetallic compound supported by carbon black. , and then natural cooling. In the synthesis method provided by the present invention, after high-temperature annealing is performed, the cooling rate during annealing is adjusted, and the temperature is lowered to 550-650°C at a cooling rate of 1-1.3°C / min, which can not only effectively promote the improvement of the alloy composition inside the particles, At the same time, when the temperature is lower than the phase transition temperature, the alloy can be effectively promoted to transform into an intermetallic compound, that is, an ordered structure is formed. The synthesized highly ordered PtCo catalyst exhibits excellent stability and catalytic redox activity, superior to commercial Pt / C.

Description

technical field [0001] The invention belongs to the field of nanotechnology, and in particular relates to a carbon black-supported highly ordered PtCo intermetallic compound and a synthesis method and application thereof. Background technique [0002] Proton exchange membrane fuel cells (PEMFCs) are considered to be a clean energy source that can be used in electric vehicles, consumer electronics, domestic power plants, and more. Nano-Pt catalysts dispersed on carbon black supports (Pt / C) have been widely used to catalyze the oxygen reduction reaction (ORR) on cathodes. However, the high cost and scarcity of Pt are the main obstacles to its widespread application. In PEMFC, Pt catalysts often suffer from insufficient activity and degradation under high potential and oxidatively acidic environments [0003] At present, in order to reduce the Pt loading and improve the activity of Pt / C catalysts, many efforts have been made, including alloying platinum-based catalysts, and f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/20C25B1/04C25B11/075
CPCB22F9/20C25B1/04Y02E60/36
Inventor 梁海伟曾维杰
Owner UNIV OF SCI & TECH OF CHINA
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