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Preparation and application of PtIr alloy and TiO2 coated graphene composite material

A composite material and graphene technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of easy attenuation and low ethanol electrooxidation efficiency, and achieve the effects of high current density, high utilization efficiency and good catalytic activity

Pending Publication Date: 2021-09-07
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a PtIr alloy and TiO 2 The preparation and application of coated graphene composite materials solve the problem of low ethanol electrooxidation efficiency and easy attenuation during multiple cycles in direct ethanol fuel cells

Method used

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  • Preparation and application of PtIr alloy and TiO2 coated graphene composite material
  • Preparation and application of PtIr alloy and TiO2 coated graphene composite material
  • Preparation and application of PtIr alloy and TiO2 coated graphene composite material

Examples

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Embodiment 1

[0034] This example provides the Ir content (Pt, Ir molar ratio is 1:0.5) TiO 2 PtIr alloy and TiO with a mass content of 20% and a firing temperature of 450°C 2 A method for preparing a coated graphene composite material. At the same time, for comparison, a preparation method without adding the alloying element Ir at the same calcination temperature is also provided. It is prepared according to the following steps, such as figure 1 Shown:

[0035] S1. Purification of graphene: 1 g of graphene was first refluxed in 3M hydrochloric acid at 70°C for 8 hours, then refluxed in 3M nitric acid solution at 70°C for 40 hours, then filtered, washed until neutral, and placed in Dry in an oven at 90°C for 8 hours, grind with an agate mortar and set aside;

[0036] S2,TiO 2 Sol-coated GN: use 1M HCl to adjust the ethanol solution of tetrabutyl titanate (850 mg) to PH = 2, and slowly add it dropwise into the ethanol-acetic acid solution containing a small amount of water, and magnetic...

Embodiment 2

[0042] This example provides the Ir content (Pt, Ir molar ratio is 1:1) TiO 2 PtIr alloy and TiO with a mass content of 20% and a firing temperature of 450°C 2 A method for preparing a coated graphene composite material. The preparation steps and detection method of this example are the same as those of Example 1, but the chloroplatinic acid added in the preparation step S4 of this example is 14.8 mg, and the chloroiridic acid added is 11.6 mg.

Embodiment 3

[0044] This example provides the Ir content (Pt, Ir molar ratio is 1:2) TiO 2 PtIr alloy and TiO with a mass content of 20% and a firing temperature of 450°C 2 A method for preparing a coated graphene composite material. The preparation steps and detection method of this example are the same as those of Example 1, but the chloroplatinic acid added in the preparation step S4 of this example is 9.9 mg, and the chloroiridic acid added is 15.6 mg.

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Abstract

The invention discloses a preparation method and application of a PtIr alloy and TiO2 coated graphene composite material, and relates to the field of nano material synthesis and electrochemical catalysis. The PtIr alloy and TiO2 coated graphene composite material comprises graphene, a PtIr alloy and TiO2. The method comprises the following steps: uniformly coating TiO2 on the surface of graphene by adopting a sol ultrasonic coating-gel roasting method, and then continuously reducing by utilizing an ultrasonic wave and hydrothermal chemical reduction method to obtain PtIr alloy nanoparticles with uniform particle size, wherein the size distribution of the nanoparticles is 2-5nm; and then carrying out dynamic in-situ adsorption on the PtIr / TiO2 / GN to form the uniformly distributed PtIr / TiO2 / GN catalyst. The composite material can be used as an ethanol electrooxidation catalyst, the use amount of Pt can be greatly reduced, and the catalytic stability and conversion efficiency of ethanol oxidation are improved.

Description

technical field [0001] The invention belongs to the field of nanomaterial synthesis and electrochemical catalysis, in particular to a PtIr alloy and TiO 2 Preparation and application of coated graphene composites. Background technique [0002] Direct ethanol fuel cell (DEFC) is a device that directly converts the chemical energy in ethanol into electrical energy. It has the advantages of environmental protection, portability, and convenient operation. It has a wide range of potential applications in mobile devices such as mobile phones and laptops. At present, the research on DEFC is still progressing slowly. The main reason is that the anode ethanol oxidation catalyst has low activity, is easy to be poisoned, and it is difficult to break the C-C bond, so it is completely oxidized to generate CO. 2 The transfer process of 12 electrons is difficult to carry out, resulting in very low ethanol oxidation efficiency. At present, the catalysts used in the electro-oxidation of et...

Claims

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Application Information

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IPC IPC(8): H01M4/92H01M4/88
CPCH01M4/921H01M4/926H01M4/8825Y02E60/50
Inventor 宋焕巧张仕欣麻浩然孙彦磊
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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