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Method for preparing three-dimensional carbon framework embedded nano platinum-based alloy catalyst

A carbon skeleton, nano-platinum technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of poor stability, low utilization rate of Pt, low activity of Pt-based catalyst, etc. Effective construction, improved utilization, excellent stability and the effect of mass specific activity

Inactive Publication Date: 2017-11-07
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a three-dimensional carbon skeleton inlaid nano-platinum-based alloy for the problems of low activity, poor stability and low utilization of Pt in the existing Pt-based catalysts.

Method used

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  • Method for preparing three-dimensional carbon framework embedded nano platinum-based alloy catalyst
  • Method for preparing three-dimensional carbon framework embedded nano platinum-based alloy catalyst
  • Method for preparing three-dimensional carbon framework embedded nano platinum-based alloy catalyst

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Embodiment 1

[0034] A method for preparing an oxygen reduction three-dimensional carbon skeleton mosaic nano-platinum-cobalt alloy catalyst, the specific method steps comprising:

[0035] (1) Preparation of surfactant-modified Pt nanoparticles dispersion

[0036] According to the methanol solution of chloroplatinic acid: methanol reducing agent: polyvinylpyrrolidone mass ratio is 1: 18: 0.20, take by weighing the methanol solution of chloroplatinic acid, methanol reducing agent and polyvinylpyrrolidone; first the methanol solution of chloroplatinic acid Dissolve it in a hydrochloric acid solution with a concentration of 9mol / L, then add a methanol reducing agent to form a platinum precursor solution with a platinum mass concentration of 9.42mg / mL; then add polyvinylpyrrolidone to the methanol solution of chloroplatinic acid, and ultrasonically stir for 20 Minutes later, adjust the pH to 9-10 with a NaOH organic reducing agent solution with a concentration of 2.92mol / L, then condense and re...

Embodiment 2

[0046] A method for preparing an oxygen reduction three-dimensional carbon skeleton mosaic nano-platinum-cobalt alloy catalyst, the specific method steps comprising:

[0047] (1) Preparation of surfactant-modified Pt nanoparticles dispersion

[0048] According to the methanol solution of chloroplatinic acid: methanol reducing agent: polyvinylpyrrolidone mass ratio is 1: 10: 0.10, take by weighing the methanol solution of chloroplatinic acid, methanol reducing agent and polyvinylpyrrolidone; first the methanol solution of chloroplatinic acid Dissolve it in a hydrochloric acid solution with a concentration of 6mol / L, then add a methanol reducing agent to form a platinum precursor solution with a platinum mass concentration of 7.54mg / mL; then add polyvinylpyrrolidone to the methanol solution of chloroplatinic acid, and ultrasonically stir for 10 Minutes later, adjust the pH to 9-10 with a NaOH organic reducing agent solution with a concentration of 1.25mol / L, then condense and re...

Embodiment 3

[0056] A method for preparing an oxygen reduction three-dimensional carbon skeleton mosaic nano-platinum-cobalt alloy catalyst, the specific method steps comprising:

[0057] (1) Preparation of surfactant-modified Pt nanoparticles dispersion

[0058]According to the mass ratio of methanol solution of potassium chloroplatinite: methanol reducing agent: polyvinylpyrrolidone is 1: 30: 0.30, take by weighing the methanol solution of potassium chloroplatinite, methanol reducing agent and polyvinylpyrrolidone; The methanol solution of potassium platinate is dissolved in the concentration of 12mol / L hydrochloric acid solution, then add methanol reducing agent to form a platinum precursor solution with a platinum mass concentration of 18.84mg / mL; Add polyvinylpyrrolidone, stir ultrasonically for 30 minutes, adjust the pH to 9-10 with a NaOH organic reducing agent solution with a concentration of 4.75mol / L, condense and reflux for 5 hours, and obtain a dispersion of nano-Pt particles; ...

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Abstract

The invention discloses a method for preparing a three-dimensional carbon framework embedded nano platinum-based alloy catalyst, and aims to solve the problems that a conventional Pt-based catalyst is low in activity, poor in stability and Pt utilization rate. According to the method, in the growth process of a zeolite imidazolate framework structural material (ZIF), Pt nanoparticles modified by a surfactant are uniformly wrapped in a ZIF structure, the high-temperature reduction process is precisely regulated, the ZIF carbonization, metal reduction and alloying process is controlled, and thus a catalyst structure of a three-dimensional carbon framework embedded nano platinum alloy is constructed. According to the method, the structural shrinkage effect of the carbonization process is smartly utilized, the ZIF structure is converted into a three-dimensional through carbon framework pore structure, the range limiting function of a ZIF framework at high temperature is smartly utilized, platinum particles and metal ions in the ZIF structure are subjected to in-situ alloying and embedded into the framework structure, then the three-dimensional catalyst of a pore-communicated framework and a nano-grade platinum alloy particle embedded structure is formed, the activity and the stability of the catalyst are greatly improved, and the utilization rate of Pt is greatly increased.

Description

technical field [0001] The invention belongs to the technical field of energy conversion and storage, and in particular relates to a method for preparing functional carbon materials through salt recrystallization and solid state. The invention belongs to the field of fuel cells, in particular to a preparation method of a three-dimensional carbon skeleton inlaid nano-platinum-based alloy. Background technique [0002] A fuel cell is a device that directly converts chemical energy into electrical energy. It has outstanding features such as high energy conversion efficiency, environmental friendliness, and high specific power and specific energy. It is considered to be the most promising chemical power source for electric vehicles and other civilian applications in the future. In the process of fuel cell commercialization, its cost and lifetime have always been the core issues that plague its development. The Pt / C catalyst currently used is highly dispersed on the carbon suppo...

Claims

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Application Information

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IPC IPC(8): H01M4/92B82Y30/00
CPCB82Y30/00H01M4/921H01M4/926Y02E60/50
Inventor 魏子栋汪望兰丁炜陶思成吴光平万小菊李巍
Owner CHONGQING UNIV
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