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Pt or Au modified porous PdFe intermetallic compound, and preparation method and application thereof

A technology of intermetallic compounds and porous structures, applied in the field of electrochemistry, can solve the problems of low catalytic activity and poor cycle stability, achieve good electrochemical stability, high cathode oxygen reduction electrocatalytic activity and stability, prevent The effect of particle aggregation

Active Publication Date: 2019-09-10
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention solves the technical problems of low catalytic activity and poor cycle stability in fuel cells in the prior art

Method used

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  • Pt or Au modified porous PdFe intermetallic compound, and preparation method and application thereof
  • Pt or Au modified porous PdFe intermetallic compound, and preparation method and application thereof
  • Pt or Au modified porous PdFe intermetallic compound, and preparation method and application thereof

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Effect test

Embodiment 1

[0037] A preparation method of a Pt-modified porous PdFe intermetallic compound electrocatalyst, comprising the following steps:

[0038] (1) Preparation of PdFe intermetallic compound: Weigh 70 mg of carbon carrier and add it to 4 mL of acetic acid solution. After fully ultrasonically dispersed, add 42.65 mg of palladium acetate and 33.06 mg of ferrous acetate. dry solvent, after drying, the precursor sample was obtained, wherein the mass fraction of Pd in ​​the precursor (including carbon support) was 20%; the obtained black powder was heated to 700°C in an argon flow for thermal decomposition treatment, and after 120min Cool to room temperature, that is.

[0039] (2) Porous PdFe intermetallic compound: Add a certain amount of the black powder prepared above into a mixed solvent of ethanol and hydrochloric acid aqueous solution (1:1, volume ratio), soak for 2 hours, and make the Fe atoms on the surface of the PdFe intermetallic compound generate Etching, enriching Pd at the...

Embodiment 2

[0042] A method for preparing a Pt-modified porous PdFe intermetallic compound electrocatalyst, comprising the following steps:

[0043] (1) Weigh 70mg carbon carrier, 42.65mg Pd(Ac) 2 and 33.06mg Fe(Ac) 2 Sequentially added to 4mL acetic acid solution, fully ultrasonicated and homogenized, the solvent was evaporated, and the precursor sample was obtained after drying, wherein the mass fraction of Pd in ​​the precursor (including carbon support) was 20%. The obtained black powder was programmed to heat up to 650° C. for thermal decomposition in a nitrogen gas stream, kept for 120 min and then cooled to room temperature to obtain a PdFe intermetallic compound.

[0044] (2) Add a certain amount of black powder prepared in step (1) into a mixed solvent of ethanol and 0.5mol / L hydrochloric acid aqueous solution (1:1, volume ratio), soak for 2 hours, and make the Fe atoms on the surface of the PdFe intermetallic compound Etching occurs, and Pd is enriched at the same time; the Pd...

Embodiment 3

[0047] A method for preparing a Pt-modified porous PdFe intermetallic compound electrocatalyst, comprising the following steps:

[0048] (1) Weigh 85mg Pd(Ac) 2 and 66mg Fe(Ac) 2 Add it into 8mL acetic acid solution, add 140mg of carbon black after ultrasonic homogenization, evaporate the solvent after ultrasonic homogenization, and obtain a precursor sample after drying, wherein the mass fraction of Pd in ​​the precursor (including carbon support) is 20%. The obtained black powder was programmed to heat up to 650° C. for thermal decomposition in a nitrogen gas stream, kept for 120 min and then cooled to room temperature to obtain a PdFe intermetallic compound.

[0049] (2) Porous PdFe intermetallic compound: Add a certain amount of black powder prepared in step (1) into a mixed solvent of 0.5M hydrochloric acid aqueous solution and ethylene glycol, soak for 1 hour, and make the Fe atoms on the surface of the PdFe intermetallic compound be engraved. At the same time, Pd is e...

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Abstract

The invention discloses a Pt or Au modified porous PdFe intermetallic compound, and a preparation method and an application thereof, and belongs to the technical field of electrochemistry. An intermetallic compound is a nanoparticle; an inner core of the nanoparticle is an ordered PdFe intermetallic compound; the surface of the nanoparticle is of a porous structure with uniformly distributed Pd; and the surface of the porous structure is modified with Pt or Au. The preparation method comprises the steps of using palladium acetate and ferric salt as metal sources, and loading the metal sourceson a carbon carrier; then thermally decomposing acetate in a protective atmosphere to obtain a supported PdFe intermetallic compound; and after Fe on the surface is etched away, adopting a surface modification technology to prepare the Pt or Au modified PdFe intermetallic compound with the porous surface and the ordered inner core. The Pt or Au modified porous PdFe intermetallic compound preparedby the method shows relatively high activity and stability as a negative oxygen reduction reaction catalyst and a positive hydrogen oxidation reaction catalyst of a fuel cell.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and relates to a Pt or Au-modified porous PdFe intermetallic compound and a preparation method and application thereof, in particular to an electrocatalyst applied to fuel cell cathode oxygen reduction and anode hydrogen oxidation reactions. Background technique [0002] With the determination of the ban on the sale of fuel vehicles in various countries, the proton exchange membrane fuel cell (proton electrolyte membrane fuel cell, PEMFC) represented by hydrogen-oxygen fuel cell has entered a period of rapid development. In addition to the general advantages of fuel cells, such as high power generation efficiency and less environmental pollution, hydrogen-oxygen fuel cell devices also have the advantages of rapid start-up at room temperature, less electrolyte loss, high specific power and long life. However, the key materials of PEMFC still need further breakthroughs, and the cost needs ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92H01M8/1007
CPCH01M4/921H01M4/926H01M8/1007Y02E60/50
Inventor 王得丽龚明星申涛邓智平杨弘毅
Owner HUAZHONG UNIV OF SCI & TECH
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