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a g-c 3 no 4 / ti 4 o 7 Preparation method of composite nanomaterials and its application in electrocatalytic oxygen reduction

A composite nanomaterial, g-c3n4 technology, applied in the field of nanomaterials, can solve the problems of high cathode overpotential, carbon carrier corrosion, poor stability, etc., achieve high oxygen reduction catalytic activity, improve oxygen reduction activity, and solve problems of poor stability Effect

Active Publication Date: 2022-04-01
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high price of metal Pt and the reserves of only 66000t, it is an urgent problem to find an electrocatalyst that can replace metal Pt.
In addition, it has been reported that commercial Pt / C electrocatalysts have the following defects: (1) Pt nanoparticles will migrate and agglomerate on the carbon support; (2) Pt nanoparticles will dissolve and redeposit during the reaction process; (3) the cathode The air introduced into the air is generally not pure oxygen, but contains trace amounts of CO, H 2 Impurities such as S and hydrocarbons will be strongly adsorbed on the surface of the Pt / C electrocatalyst, preventing the oxygen reduction reaction and poisoning the Pt / C electrocatalyst; Shedding of nanoparticles (Carban, 2005, 43: 1512-1516, J Catal, 1995, 154: 299-305, J PowerSources, 2006, 156: 128-141, Solid State Ionics, 2004, 175: 809-813)
In order to solve the problems of low reserves, high cost and poor stability of metal Pt existing in commercial Pt / C, it has been reported that titanium oxide TiO with better stability 2 、Ti 4 o 7 and Ti 3 o 5 Doped with noble metals Ir, Pd, Pt, etc. (Journal of Catalysis 358 (2018) 287–294, Applied Catalysis B: Environmental 201 (2017) 419–429), but the addition of noble metals makes the overpotential of the cathode in the oxygen reduction reaction relatively low. High, the increase in the load of the electrocatalyst leads to an increase in the reaction cost

Method used

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  • a g-c <sub>3</sub> no <sub>4</sub> / ti <sub>4</sub> o <sub>7</sub> Preparation method of composite nanomaterials and its application in electrocatalytic oxygen reduction
  • a g-c <sub>3</sub> no <sub>4</sub> / ti <sub>4</sub> o <sub>7</sub> Preparation method of composite nanomaterials and its application in electrocatalytic oxygen reduction
  • a g-c <sub>3</sub> no <sub>4</sub> / ti <sub>4</sub> o <sub>7</sub> Preparation method of composite nanomaterials and its application in electrocatalytic oxygen reduction

Examples

Experimental program
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Effect test

Embodiment 1

[0032] 1. Preparation of g-C 3 N 4

[0033] Put urea into a 50.0mL corundum crucible, the amount of urea is half of the volume of the crucible, then wrap the corundum crucible with aluminum foil and put it in a muffle furnace, raise the temperature from room temperature to 550°C at a heating rate of 25°C / min, and keep it warm 4 h, g-C was obtained after natural cooling 3 N 4 .

[0034] 2. Preparation of g-C 3 N 4 / TiO 2 Complex

[0035] 0.1024g g-C 3 N 4 Ultrasonic dissolved in 40.0mL deionized water, stirred at 700rpm for 1h to obtain mixed solution A; at the same time, dissolved 7.5mL tetrabutyl titanate in 40.0mL ethylene glycol, stirred at 700rpm for 1h to obtain mixed solution B; then at 800rpm Under vigorous stirring, add the mixed solution B to the mixed solution A drop by drop, and the dropwise addition is completed in 30 minutes to obtain the mixed solution C; finally, the stirred mixed solution C is hydrothermally reacted at 180 ℃ for 10 hours, and after th...

Embodiment 2

[0041] In step 2 of this example, 2 mL of tetrabutyl titanate was dissolved in 40.0 mL of ethylene glycol, and stirred at 700 rpm for 1 h to obtain a mixed solution B; other steps were the same as in Example 1 to obtain g-C 3 N 4 / Ti 4 o 7 composite nanomaterials. The resulting g-C 3 N 4 / Ti 4 o 7 Ti in Composite Nanomaterials 4 o 7 The diameter of the nanoparticles is 20-30nm.

Embodiment 3

[0043] In the step 3 of the present embodiment, the addition amount of dopamine hydrochloride (PDA) is 0.10g, other steps are the same as embodiment 1, obtain g-C 3 N 4 / Ti 4 o 7 composite nanomaterials. The resulting g-C 3 N 4 / Ti 4 o 7 Ti in Composite Nanomaterials 4 o 7 The diameter of the nanoparticles is 15-30nm.

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Abstract

The invention discloses a g-C 3 N 4 / Ti 4 o 7 The preparation method of composite nanomaterials and its application in electrocatalytic oxygen reduction, firstly, g‑C was prepared by high temperature annealing 3 N 4 , and then use the hydrothermal reaction to prepare g‑C 3 N 4 / TiO 2 complex, and then coated with a layer of PDA on its surface to form g‑C 3 N 4 / TiO 2 / PDA composite precursor, and finally g‑C 3 N 4 / TiO 2 / PDA composite precursor is annealed at 850-1000°C in an inert environment to obtain g-C 3 N 4 / Ti 4 o 7 composite nanomaterials. Invention g-C 3 N 4 / Ti 4 o 7 The preparation method of composite nanomaterials is simple, low-cost and environmentally friendly, among which Ti 4 o 7 The particle size of the nanoparticles is between 10-30nm. Invention g-C 3 N 4 / Ti 4 o 7 When the composite nanomaterial is used as an oxygen reduction electrocatalyst, it has high oxygen reduction activity, resistance to methanol toxicity and stability, and solves the problem of low storage and high cost of commercial Pt / C.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a preparation method of an electrocatalyst, which is used for the oxygen reduction reaction of a cathode in a fuel cell. Background technique [0002] Energy issues have always plagued mankind, and people's demand for energy is increasing day by day. As a new technology with high efficiency and cleanliness, fuel cell has become the development hotspot in the field of new energy in the world today. Catalyst is a very important component in fuel cells, and its cost accounts for one-third of the cost of fuel cells. The most dominant reaction in the air cathode is the oxygen reduction reaction. The kinetics of the oxygen reduction reaction is very slow, and the main difficulty comes from the unusually strong O=O bond 498kJ / mol, which is difficult to break in the electrochemical state. Therefore, in order to accelerate the occurrence of oxygen reduction reac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/90B82Y40/00
CPCH01M4/8878H01M4/8882H01M4/90H01M4/8647B82Y40/00H01M2004/8684Y02E60/50
Inventor 雷毅敏武德凯胡启航杨成哲
Owner XIDIAN UNIV
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