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High-stability nano platinum-based intermetallic compound direct methanol fuel cell electrocatalyst and preparation method thereof

A methanol fuel cell and electrocatalyst technology, applied in battery electrodes, nanotechnology, nanotechnology and other directions, can solve the problems of complex preparation, growth, easy agglomeration of nanoparticles, and achieve simple and feasible preparation methods, overcome removal difficulties, The effect of inhibiting migration

Active Publication Date: 2021-12-17
CHONGQING NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of highly stable nano platinum-based intermetallic compound direct methanol fuel cell electrocatalyst and preparation thereof The method is used to solve the problems of complex preparation of electrocatalysts for direct methanol fuel cells, easy agglomeration and growth of nanoparticles, etc.

Method used

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  • High-stability nano platinum-based intermetallic compound direct methanol fuel cell electrocatalyst and preparation method thereof
  • High-stability nano platinum-based intermetallic compound direct methanol fuel cell electrocatalyst and preparation method thereof
  • High-stability nano platinum-based intermetallic compound direct methanol fuel cell electrocatalyst and preparation method thereof

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preparation example Construction

[0050] The purpose of the present invention is to provide a highly stable nano-platinum-based intermetallic compound direct methanol fuel cell electrocatalyst for the shortcomings of the existing intermetallic compound nano-catalyst direct methanol fuel cell electrocatalyst preparation complexity, nano-particles are easy to agglomerate, grow up, etc. A preparation method comprising the steps of:

[0051] First, a layer of polyaniline (PANI) is oxidized and polymerized on the surface of the Pt / C catalyst in situ, and a certain amount of transition metal ions is adsorbed, and then solidified and packaged with an inorganic salt solution to obtain a salt-sealed and cured sample; the salt-sealed solidified Driven by high temperature, the transition metal ions are reduced to transition metal atoms by the reduction of nitrogen-doped carbon (NC) formed by carbonization of polyaniline, and the transition metal atoms gradually diffuse into the Pt lattice to form a Pt-based alloy; Pt At ...

Embodiment 1

[0086] (1), Pt / C catalyst surface coated with polyaniline (PANI)

[0087] Weigh the Pt / C catalyst and aniline according to the mass ratio of Pt / C catalyst:aniline as 1:1, and weigh the ammonium persulfate according to the mass ratio of aniline:ammonium persulfate as 1:3. First add aniline monomer to 0.5mol / L sulfuric acid aqueous solution, after ultrasonic stirring for 20 minutes, add Pt / C catalyst, continue ultrasonic stirring for 20 hours, after the Pt / C catalyst is uniformly dispersed, under the condition of stirring at 0°C, put Ammonium persulfate dissolved in 0.5mol / L sulfuric acid aqueous solution was slowly added dropwise to the mixed solution of Pt / C catalyst and aniline, and the dropping time was controlled at 30 minutes. After the dropping was completed, the reaction was continued for 24 hours; then the product was dried and ground to obtain a polyaniline-coated Pt / C catalyst (PANI@Pt / C).

[0088] (2), metal iron salt adsorption and inorganic salt solution recrystal...

Embodiment 2

[0103] (1), Pt / C catalyst surface coated with polyaniline (PANI)

[0104] Weigh the Pt / C catalyst and aniline according to the mass ratio of Pt / C catalyst:aniline as 1:1, and weigh the ammonium persulfate according to the mass ratio of aniline:ammonium persulfate as 1:3. First add aniline monomer to 0.5mol / L sulfuric acid aqueous solution, after ultrasonic stirring for 20 minutes, add Pt / C catalyst, continue ultrasonic stirring for 20 hours, after the Pt / C catalyst is uniformly dispersed, under the condition of stirring at 0°C, put Ammonium persulfate dissolved in 0.5mol / L sulfuric acid aqueous solution was slowly added dropwise to the mixed solution of Pt / C catalyst and aniline, and the dropping time was controlled at 30 minutes. After the dropping was completed, the reaction was continued for 20 hours; then the product was dried and ground to obtain a polyaniline-coated Pt / C catalyst (PANI@Pt / C).

[0105] (2), metal iron salt adsorption and inorganic salt solution recrystal...

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Abstract

The invention discloses a high-stability nano platinum-based intermetallic compound direct methanol fuel cell electrocatalyst and a preparation method thereof. The preparation method comprises the steps that firstly, a layer of polyaniline is subjected to in-situ oxidative polymerization on the surface of a Pt / C catalyst, transition metal ions are adsorbed, and then a salt-sealed and cured sample is obtained through curing and packaging treatment with an inorganic salt solution; then under high-temperature driving, the transition metal ions are reduced into transition metal atoms under the reduction effect of nitrogen-doped carbon formed through polyaniline carbonization, the transition metal atoms are gradually diffused into Pt crystal lattices, and Pt-based alloy is formed; and Pt and transition metal atoms are subjected to atom rearrangement at a high temperature, and finally, the Pt and the transition metal atoms are mutually converted to form the nano Pt-based intermetallic compound. According to the invention, by constructing an inorganic salt@PANI@Pt / C-transition metal ion system, an alloying-ordering process from pure Pt nanoparticles to a Pt-based intermetallic compound is realized in one step by means of high-temperature thermal driving, and low platinization and stabilization of the direct methanol fuel cell electrocatalyst are realized.

Description

technical field [0001] The invention relates to the technical field of fuel cell electrocatalysts, in particular to a highly stable nano-platinum-based intermetallic compound direct methanol fuel cell electrocatalyst and a preparation method thereof. Background technique [0002] Direct methanol fuel cell (DMFC) is a new type of proton exchange membrane fuel cell that uses liquid methanol as fuel. It not only has high energy efficiency and is environmentally friendly, but also has high stability, good continuous power supply performance, cheap fuel, and easy transportation. Therefore, it is recognized by countries all over the world as the best power generation equipment to replace existing batteries, small generators and become mobile power sources. Methanol oxidation (MOR) is an anode reaction in DMFC, which is mainly catalyzed by platinum (Pt)-based noble metal catalysts. However, due to the scarcity and high price of precious metal platinum resources, the large-scale co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92H01M4/88H01M4/86B82Y30/00
CPCH01M4/921H01M4/926H01M4/8878H01M4/8657B82Y30/00Y02E60/50
Inventor 聂瑶李茹欣程幸方燕温亲青杨婷
Owner CHONGQING NORMAL UNIVERSITY
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