Preparation method of carbon-supported Pt-based nanometer catalyst

A nano-catalyst and carbon-supported technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of tedious time-consuming, difficult to control particle size, easy agglomeration, etc., and achieve low product loss , Improve the catalytic reduction ability, the effect of not easy to reunite

Inactive Publication Date: 2011-10-19
HARBIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] The present invention aims to solve the defects of the existing carbon-supported Pt-based catalyst preparation methods, which are cumbersome and ti

Method used

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  • Preparation method of carbon-supported Pt-based nanometer catalyst
  • Preparation method of carbon-supported Pt-based nanometer catalyst
  • Preparation method of carbon-supported Pt-based nanometer catalyst

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specific Embodiment approach 1

[0015] Specific embodiment one: the preparation method of carbon-supported Pt-based nano-catalyst in the present embodiment is carried out according to the following steps:

[0016] 1. Put 1g of activated carbon into 15mL mixed acid solution. The mixed acid solution is prepared from analytically pure concentrated sulfuric acid and analytically pure concentrated nitric acid in a volume ratio of 3:1, then add 150mL triple distilled water, stir at room temperature for 30min, and then cool to room temperature , suction filtered until the filtrate is neutral, and vacuum-dried at 80°C for 10 hours;

[0017] 2. Add 0.1g of activated carbon treated in step 1 into 10mL of ethylene glycol, then ultrasonically oscillate for 2 hours under the condition of ultrasonic frequency of 40kHz and ultrasonic power of 80W, and then add 5.03mL of chloroplatinic acid and chloride Cobalt mixed solution, the molar ratio of Pt element and Co element in the mixed solution of chloroplatinic acid and cobal...

specific Embodiment approach 2

[0018] Embodiment 2: This embodiment is different from Embodiment 1 in that the molar ratio of Pt element to Co element is 3:1. (Obtaining the nanometer Pt-Co / C catalyst means that the mass fraction of Pt in the product is 20%) Other steps and parameters are the same as those in Embodiment 1.

[0019] figure 1 Shown is the TEM photo of the Pt-Co / C catalyst prepared by this method. It can be clearly seen from the photo that the particle size of the catalyst is very uniform, the average particle size is about 3nm, and the particle distribution is uniform.

[0020] exist figure 2 Shown embodiment is, the prepared Pt-Co / C of this method (catalyst electrode O 2 Linear scan curve at saturation, 25°C, 0.5mol L -1 h 2 SO 4 solution, 1000 rpm. Experiment specific conditions and steps are as follows: 1, the preparation of working electrode: get the catalyst 5.0mg that makes and 0.2mL water, 0.25mL percentage by weight is 5wt.% Nafion (the solution of the DoPond company that buys...

specific Embodiment approach 3

[0022] Specific embodiment three: the preparation method of carbon-supported Pt-based nano-catalyst in the present embodiment is carried out according to the following steps:

[0023] 1. Put 1g of activated carbon into 15mL mixed acid solution. The mixed acid solution is prepared from analytically pure concentrated sulfuric acid and analytically pure concentrated nitric acid in a volume ratio of 3:1, then add 150mL triple distilled water, stir at room temperature for 30min, and then cool to room temperature , suction filtered until the filtrate is neutral, and vacuum-dried at 80°C for 10 hours;

[0024] 2. Add 0.1g of activated carbon treated in step 1 into 10mL of ethylene glycol, then ultrasonically oscillate for 2 hours under the condition of ultrasonic frequency of 40kHz and ultrasonic power of 80W, and then add 5.03mL of chloroplatinic acid and chloride Cobalt mixed solution, the molar ratio of Pt element and Co element in the mixed solution of chloroplatinic acid and cob...

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Abstract

The invention provides a preparation method of a carbon-supported Pt-based nanometer catalyst, relating to a preparation method for the carbon-supported Pt-based catalyst. The invention aims at solving the defects that by adopting the existing preparation method of the carbon-supported Pt-based catalyst, the operation is inconvenient, the grain size can not be controlled easily, and grains are easy to agglomerate and the like. The preparation method comprises the following steps of step 1: placing active carbons in a mixed acid solution containing concentrated sulfuric acid and concentrated nitric acid, and subsequently adding distilled water for three times in the mixed acid solution; stirring the solution under room temperature; subsequently cooling the solution to the room temperature; carrying out extraction filtration to obtain neutral filtrate; carrying out vacuum drying on the neutral filtrate; step 2: adding the active carbons processed in the step 1 into glycol; subsequently carrying out ultrasonic oscillation; subsequently dripping the mixed solution containing chloroplatinic acid and cobalt chloride; adding formic acid in the solution and stirring the solution for 30 minutes under the temperature of 25 DEG C; placing the solution in a microwave oven and intermittently heating the solution; and then carrying out cooling, extraction filtration and vacuum drying on the solution, thus obtaining the carbon-supported Pt-based nanometer catalyst. The preparation method has simple preparation steps, short required time and loss product loss. The catalyst has small grains, is not easy to agglomerate, is distributed uniformly and has high electrochemical catalytic activity.

Description

technical field [0001] The invention relates to a preparation method of a carbon-supported Pt catalyst. Background technique [0002] At present, the commonly used oxygen reduction catalyst is carbon-supported Pt base (Pt / C catalyst), but although the Pt / C catalyst has good catalytic performance for oxygen reduction, it also has good catalytic performance for the oxidation of methanol permeated into the cathode. Ability to generate mixed potentials, resulting in complex cathode reactions and reduced battery efficiency. At the same time, in the existing preparation method, the preparation process is complex and time-consuming, and the obtained nano-scale catalyst is easy to agglomerate. As an alcohol fuel cell, the cathode catalyst requires not only high electrocatalytic reduction of oxygen, but also good resistance to alcohol oxidation. Therefore, a catalyst preparation method with a simple and rapid process is sought, so that the prepared catalyst not only has good cataly...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J37/34H01M4/92
CPCY02E60/50
Inventor 邬冰高颖邓超
Owner HARBIN NORMAL UNIVERSITY
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