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Carbon black loaded highly-ordered PtNi intermetallic compound, synthesis method and application thereof

A technology of intermetallic compounds and synthesis methods, applied in the field of nanomaterials, can solve problems such as insufficient kinetic diffusion, low phase transition temperature, and insufficient thermodynamic driving force, and achieve good electrocatalytic oxygen reduction activity.

Active Publication Date: 2021-08-10
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

However, the current relatively difficult synthesis of PtNi intermetallics is due to the low phase transition temperature at which the kinetic diffusion is insufficient, and the thermodynamic driving force at higher temperatures is insufficient.

Method used

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  • Carbon black loaded highly-ordered PtNi intermetallic compound, synthesis method and application thereof
  • Carbon black loaded highly-ordered PtNi intermetallic compound, synthesis method and application thereof
  • Carbon black loaded highly-ordered PtNi intermetallic compound, synthesis method and application thereof

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preparation example Construction

[0028] The present invention provides a kind of synthetic method that prepares carbon black loading highly ordered PtNi intermetallic compound by two-step heat treatment, comprises the following steps:

[0029] A) nickel salt, platinum salt and carbon black are dispersed in a solvent to obtain a suspension;

[0030] B) removing the solvent from the suspension and performing high-temperature annealing and low-temperature annealing in sequence to obtain a highly ordered PtNi intermetallic compound loaded with carbon black.

[0031] In the present invention, nickel salt, platinum salt and carbon black are firstly dispersed in a solvent to obtain a suspension. Wherein, the nickel salt is selected from NiCl 2 ·6H 2 O; the platinum salt is selected from H 2 PtCl 4 ·6H 2 O.

[0032] The molar ratio of the nickel salt to the platinum salt is 1.2-1.5:1, preferably 1.2:1, 1.3:1, 1.4:1, 1.5:1, or any value between 1.2-1.5:1.

[0033] The mass ratio of the total mass of the nickel ...

Embodiment 1

[0054] a. 50g commercial carbon black BP2000, 14.7mg H 2 PtCl 4 ·6H 2 O and 10.2 mg NiCl 2 ·6H 2 O was mixed with 50mL absolute ethanol, soaked and stirred overnight, and the solvent was removed by a rotary evaporator to obtain a uniformly mixed precursor powder;

[0055] b. After drying the precursor powder in an oven, transfer it to a quartz crucible, put it into a tube furnace, and raise the powder precursor to 5°C / min under a protective atmosphere of 5% hydrogen and 95% argon. 1100°C, keep for 2h; then cool to 550°C for 30 minutes and keep for 12 hours, then naturally cool to room temperature to obtain a highly ordered PtNi intermetallic compound;

[0056] Characterization of highly ordered PtNi intermetallic compounds, the results are shown in Figure 1~4 . figure 1 The transmission electron microscope picture of the PtNi intermetallic compound prepared in Example 1 of the present invention shows that the PtNi intermetallic compound is evenly dispersed on the commer...

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Abstract

The invention provides a synthesis method for preparing a carbon black loaded highly-ordered PtNi intermetallic compound through two-step heat treatment. The method comprises the following steps: A) dispersing a nickel salt, a platinum salt and carbon black in a solvent to obtain a suspension; and B) removing the solvent from the suspension, and sequentially carrying out high-temperature annealing and low-temperature annealing to obtain the carbon black loaded highly-ordered PtNi intermetallic compound. According to the method provided by the invention, the completion of particle alloying is firstly promoted in a high-temperature stage, the alloy proportion is promoted to reach the required stoichiometric ratio, and then the alloy is promoted to be converted into an intermetallic compound to form an ordered structure at the temperature lower than the PtNi phase transformation temperature by long-time heat preservation, so that the highly ordered PtNi intermetallic compound catalyst is obtained; and the catalyst shows good electrocatalytic oxygen reduction activity, and is superior to commercial Pt / C sold in the market.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a highly ordered PtNi intermetallic compound supported by carbon black, a synthesis method and an application thereof. Background technique [0002] Fuel cells are a very promising energy conversion device that can theoretically convert chemical energy into electricity more efficiently than currently used heat engine technologies. Achieving the efficiency and reliability required for commercial applications remains a challenge. sex task. In this study, the focus challenge was proton exchange membrane fuel cells (PEMFC) operating at or near room temperature. Current PEMFCs suffer from many material limitations. For example, better catalyst materials require higher activity, less poisoning performance, longer lifetime and lower cost. Currently the best catalyst for use in PEMFC is Pt / C catalyst, but Pt is not only a noble metal and has limited reserves. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92B22F9/22B22F1/00
CPCB22F1/0003H01M4/921H01M4/926B22F9/22B22F2301/40Y02E60/50
Inventor 梁海伟曾维杰
Owner UNIV OF SCI & TECH OF CHINA
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