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Graphite-phase carbon nitride-modified carbon black-loaded platinum-palladium alloy nano electrocatalyst and preparation method

A graphite-phase carbon nitride and platinum-palladium alloy technology is applied in nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science. Electrocatalyst activity and other issues, to achieve the effect of good electrochemical catalytic oxidation performance, strong electrochemical corrosion resistance, and small particle size

Inactive Publication Date: 2016-01-13
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the raw materials of this method are complicated, the yield is low, and the carbon content of the product is low, and the conductivity is poor.
The higher calcination temperature destroys the surface functional groups of carbon black and hinders the nucleation of noble metal nanoparticles on the surface of carbon black, which in turn affects the activity of electrocatalysts.

Method used

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  • Graphite-phase carbon nitride-modified carbon black-loaded platinum-palladium alloy nano electrocatalyst and preparation method
  • Graphite-phase carbon nitride-modified carbon black-loaded platinum-palladium alloy nano electrocatalyst and preparation method
  • Graphite-phase carbon nitride-modified carbon black-loaded platinum-palladium alloy nano electrocatalyst and preparation method

Examples

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Effect test

Embodiment 1

[0028] Implementation example 1: the preparation method of the carbon black loaded platinum-palladium alloy nano electrocatalyst of graphite phase carbon nitride (30%) modification of the present invention, comprises the following steps:

[0029] The first step, the 1gVulcan XC-72R was placed in 100g of concentrated nitric acid, stirred evenly, transferred into a 200mL hydrothermal kettle, and reacted at 120°C for 12h. The product is centrifuged and dried to obtain acid-treated carbon black;

[0030] In the second step, 300 mg of melamine and 700 mg of acid-treated carbon black were dispersed into 100 mL of deionized water;

[0031] In the third step, 40 mL of dilute nitric acid (0.1 mol / L) was dropped into the dispersion obtained in the second step and stirred for 1 h, centrifuged, washed with ethanol for 3 times, and dried;

[0032] In the fourth step, the melamine / carbon black mixture obtained in the third step is calcined in a nitrogen atmosphere at 400° C. for 2 hours ...

Embodiment 2

[0034] Implementation example 2: the preparation method of the carbon black supported platinum-palladium alloy nano electrocatalyst of graphite phase carbon nitride (50%) modification of the present invention, comprises the following steps:

[0035] The first step, with the first step in implementation example 1, drying obtains acid-treated carbon black;

[0036] In the second step, 500 mg of melamine and 500 mg of acid-treated carbon black were dispersed in 22 mL of ethylene glycol;

[0037] In the third step, 66 mL of dilute nitric acid (0.12 mol / L) was dropped into the dispersion liquid obtained in the second step and stirred for 1 h, centrifuged, washed with ethanol for 3 times, and dried;

[0038] The fourth step is to calcinate the melamine / carbon black mixture obtained in the third step in a nitrogen atmosphere at 350° C. for 1 hour to obtain a graphite phase carbon nitride / carbon black composite;

[0039]The fifth step is to disperse 20 mg of the graphite phase carbon...

Embodiment 3

[0041] Implementation example 3: the preparation method of the carbon black supported platinum-palladium alloy nano electrocatalyst of graphite phase carbon nitride (70%) modification of the present invention, comprises the following steps:

[0042] The first step, with the first step in implementation example 1, drying obtains acid-treated carbon black;

[0043] In the second step, 700 mg of melamine and 300 mg of acid-treated carbon black were dispersed in 62.5 mL of ethylene glycol;

[0044] In the third step, 100 mL of dilute nitric acid (0.15 mol / L) was dropped into the dispersion obtained in the second step and stirred for 1 h, centrifuged, washed with ethanol for 3 times, and dried;

[0045] In the fourth step, the melamine / carbon black mixture obtained in the third step is calcined in a nitrogen atmosphere at 350° C. for 3 hours to obtain a graphite phase carbon nitride / carbon black composite;

[0046] The fifth step is to disperse 20 mg of the graphite phase carbon n...

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Abstract

The invention discloses a graphite-phase carbon nitride-modified carbon black-loaded platinum-palladium alloy nano electrocatalyst and a preparation method. The method comprises the steps as follows: melamine is adopted as a precursor for the first time; graphite-phase carbon nitride grows on a carbon black surface, so that the electrochemical corrosion resistance of the carbon black in an acidic electrolyte is improved; and with platinum nitrate and palladium nitrate as the precursors and hydrazine hydrate as a reducing agent, platinum-palladium alloy nanoparticles of which the average particle size is 5nm are evenly deposited on the graphite-phase carbon nitride-modified carbon black surface, so as to obtain the graphite-phase carbon nitride-modified carbon black-loaded platinum-palladium alloy nano electrocatalyst. Reaction conditions are mild; a surfactant does not need to be used; and the graphite-phase carbon nitride-modified carbon black-loaded platinum-palladium alloy nano electrocatalyst has relatively high electrochemical catalytic activity, stability and electrochemical corrosion resistance, and has relatively good application prospect and economic benefits in the aspects of direct alcohol fuel cells.

Description

technical field [0001] The invention belongs to the field of preparation of nanocomposite materials, and in particular relates to a carbon black-loaded platinum-palladium alloy nanometer electrocatalyst modified by graphite phase carbon nitride and a preparation method thereof. Background technique [0002] Platinum / carbon (Pt / C) and palladium / carbon (Pd / C) catalysts are widely used in important fields such as organic catalysis, fuel cells and electrochemical catalysis. Studies have shown that when Pt / C or Pd / C catalysts are used in the catalytic oxidation reaction of the negative electrode of fuel cells, there is electrochemical corrosion of noble metals and carbon support materials [Quantitative characterization of catalyst layer degradation in PEM fuel cells by X-ray photoelectronspectroscopy [J]. Electrochimica Acta, 2009, 54: 4025-4030 ]. Electrochemical corrosion of the electrode catalyst will directly lead to rapid decay of fuel cell performance [PEMfuelcellcathodeca...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/92H01M4/88B82Y30/00
CPCB82Y30/00H01M4/88H01M4/90H01M4/9083H01M4/921Y02E60/50
Inventor 汪信钱华玉付永胜朱俊武张文耀张咪薛晓东邵惠
Owner NANJING UNIV OF SCI & TECH
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