Preparation method of metal-free oxygen reduction catalyst

A catalyst and metal-free technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of high-temperature equipment, high energy consumption, complex process, etc., and achieve the effects of low energy consumption, good stability, and easy operation

A catalyst and metal-free technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of high-temperature equipment, high energy consumption, complex process, etc., and achieve the effects of low energy consumption, good stability, and easy operation

CN104282920AInactive Publication Date: 2015-01-14HUAZHONG UNIV OF SCI & TECH
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  • Preparation method of metal-free oxygen reduction catalyst
  • Preparation method of metal-free oxygen reduction catalyst
  • Preparation method of metal-free oxygen reduction catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1, comprises the steps:

[0020] In step (1), the glassy carbon substrate is polished to a mirror surface on a polishing cloth with 1.0 μm and 0.3 μm alumina powder in turn, and then used as a working electrode, platinum wire as a counter electrode, Ag / Ag + As a reference electrode, the electrochemical oxidation reaction is carried out in the electrolyte, and the potential of the electrochemical oxidation reaction is 0V to 1.2V, and a glassy carbon substrate with a negative charge on the surface is obtained;

[0021] The electrolyte is a mixed solution of 4-aminobenzoic acid, lithium perchlorate and absolute ethanol, and the molar concentrations of 4-aminobenzoic acid and lithium perchlorate in the mixed solution are 1mM and 0.1M respectively;

[0022] In step (2), immerse the negatively charged glassy carbon substrate obtained in step (1) on its surface in a 0.2 wt% aqueous solution of diethylene glycol diacrylate (PDDA) by mass, and take it out after 5 minu...

Embodiment 2

[0026] Embodiment 2, comprises the steps:

[0027] In step (1), the glassy carbon substrate is polished to a mirror surface on a polishing cloth with 1.0 μm and 0.3 μm alumina powder in turn, and then used as a working electrode, platinum wire as a counter electrode, Ag / Ag + As a reference electrode, the electrochemical oxidation reaction is carried out in the electrolyte, and the potential of the electrochemical oxidation reaction is 0V to 1.2V, and a glassy carbon substrate with a negative charge on the surface is obtained;

[0028] The electrolyte is a mixed solution of 4-aminobenzoic acid, lithium perchlorate and absolute ethanol, and the molar concentrations of 4-aminobenzoic acid and lithium perchlorate in the mixed solution are 3mM and 0.3M respectively;

[0029]In step (2), immerse the negatively charged glassy carbon substrate obtained in step (1) on its surface in an aqueous solution of 0.5 wt% diethylene glycol diacrylate (PDDA) by mass percentage, take it out after...

Embodiment 3

[0037] Embodiment 3, comprises the steps:

[0038] In step (1), the glassy carbon substrate is polished to a mirror surface on a polishing cloth with 1.0 μm and 0.3 μm alumina powder in turn, and then used as a working electrode, platinum wire as a counter electrode, Ag / Ag + As a reference electrode, the electrochemical oxidation reaction is carried out in the electrolyte, and the potential of the electrochemical oxidation reaction is 0V to 1.2V, and a glassy carbon substrate with a negative charge on the surface is obtained;

[0039] The electrolyte is a mixed solution of 4-aminobenzoic acid, lithium perchlorate and absolute ethanol, and the molar concentrations of 4-aminobenzoic acid and lithium perchlorate in the mixed solution are 7mM and 0.4M respectively;

[0040] In step (2), the negatively charged glassy carbon substrate obtained in step (1) is immersed in a 0.8 wt% aqueous solution of diethylene glycol diacrylate (PDDA) by mass, and taken out after 30 minutes. Rinse ...

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Abstract

Belonging to preparation methods of fuel cell cathode materials, the invention discloses a preparation method of a metal-free oxygen reduction catalyst. According to the invention, negatively charged graphene oxide and positively charged PDDA are assembled into a multilayer film by electrostatic adsorption and alternating deposition, and in a phosphoric acid buffer solution of saturated nitrogen, the multilayer film converts the graphene oxide into an electro-reduction graphene oxide through electrochemical reduction. Because of the synergistic effect between the PDDA and the electro-reduction graphene oxide, the obtained multilayer film has very good catalytic activity on oxygen and excellent methanol poisoning resistance. Compared with existing preparation methods, the preparation process involved in the invention has the characteristics of no need of high-temperature equipment, simple operation and small energy consumption, and can strictly control the film thickness.

Description

technical field [0001] The invention belongs to a preparation method of fuel cell cathode materials, in particular to a preparation method of a metal-free oxygen reduction catalyst. Background technique [0002] Proton exchange membrane fuel cells have attracted widespread attention due to their high conversion efficiency, high energy density, and environmental friendliness. However, their commercial application is limited by manufacturing costs and stability. The reaction rate of the cathodic oxygen reduction reaction is 6 to 7 orders of magnitude lower than that of the anodic hydrogen oxidation reaction, resulting in a large amount of platinum-based catalysts being used at the cathode. In addition, since methanol, ethanol and other small molecular organic compounds can easily poison platinum-based catalysts, their stability is also an urgent problem to be solved. [0003] Dai's research group found that array-shaped nitrogen-doped carbon nanotubes have very high activity ...

Claims

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Application Information

Patent Timeline
14 Jan 2015
Publication
CN104282920A
IPC
H01M4/90
CPC
H01M4/9008; H01M4/9016; Y02E60/50
Inventors
申燕; 黄德康