Modified carbon nitride loaded noble metal-based electrocatalyst as well as preparation method and application thereof

An electrocatalyst, carbon nitride technology, applied in circuits, electrical components, battery electrodes, etc., can solve the problems of poor thermodynamic stability of carbon-based materials, aggravating the agglomeration of precious metal nanoparticles, destroying the structural integrity of catalysts, etc. Enhanced structural stability and long-term cycle stability, and the effect of simple and controllable preparation methods

Active Publication Date: 2021-09-24
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During the cathodic reaction, the catalyst has problems such as the dissolution and agglomeration of noble metal particles caused by Ostwald ripening, etc.
At the same time, the thermodynamic stability of the carbon substrate material is poor, and it is easy to oxidize and decompose under high potential, which seriously damages the structural integrity of the catalyst, further aggravates the agglomeration of noble metal nanoparticles, causes a sharp decrease in the active area of ​​the electrocatalyst, and greatly reduces the durability of the catalyst.

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  • Modified carbon nitride loaded noble metal-based electrocatalyst as well as preparation method and application thereof
  • Modified carbon nitride loaded noble metal-based electrocatalyst as well as preparation method and application thereof
  • Modified carbon nitride loaded noble metal-based electrocatalyst as well as preparation method and application thereof

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preparation example Construction

[0034] In one embodiment of the present disclosure, a method for preparing a modified carbon nitride-supported noble metal-based electrocatalyst includes:

[0035] (1), placing carbon nitride in hydrochloric acid for surface protonation;

[0036] (2), mixing the protonated carbon nitride and the heteroatom source for heat treatment to obtain modified carbon nitride;

[0037] (3) After mixing the modified carbon nitride and the noble metal source, the noble metal nanoparticles are reacted and supported.

[0038]The preparation method provided by the disclosure is simple, and the obtained electrocatalyst is uniformly dispersed without agglomeration. The preparation method can reduce the loaded amount of the noble metal nanoparticles, and effectively control the size of the noble metal nanoparticles at 3-10nm, which is conducive to maximizing the catalytic activity of the noble metals.

[0039] Further, in step (1), the preparation method of carbon nitride comprises heat-treati...

Embodiment 1

[0063] A modified carbon nitride carrier-supported platinum oxygen reduction reaction electrocatalyst, the preparation method specifically comprising:

[0064] Step 1) Preparation method of modified carbon nitride: put 5g of melamine in a porcelain boat, put it in a tube furnace, raise the temperature to 550°C at a rate of 5°C / min, keep it warm for 3h, and drop it to room temperature to obtain graphite phase carbon nitride. Then take 1g of graphite phase carbon nitride and add 10ml of concentrated hydrochloric acid with a concentration of 4M, first ultrasonic for one hour, then magnetically stirred for three hours, after repeated washing with deionized water, the pH is close to 7, and the obtained product is protonated carbon nitride , placed in a blast oven to dry for 10 hours. Take 0.5g of protonated carbon nitride and 0.5g of sulfur powder and add them into a mortar for grinding. After grinding evenly, put the mixture of protonated carbon nitride and sulfur powder into a p...

Embodiment 2

[0070] A preparation method of a modified carbon nitride supported palladium oxygen reduction reaction electrocatalyst:

[0071] The method of this embodiment is basically the same as that of Embodiment 1, except that the supported noble metal is palladium. The specific steps include: the preparation method of the modified carbon nitride is the same as step 1) in Example 1. Dissolve 60mg of modified carbon nitride in a mixed solvent of 150ml of isopropanol and 200ml of deionized water, then add 0.2ml of an aqueous solution with a concentration of 0.1M potassium chloropalladate, ultrasonicate the resulting mixed solution for 1 hour and place it in an oil bath at 50°C Heated for 2 hours, after the reaction was completed, it was repeatedly washed with ethanol and water, centrifuged, and finally put into a vacuum oven for drying at 60°C. electrocatalyst.

[0072] In the present embodiment, the palladium particle diameter supported on the modified carbon nitride is about 10nm, su...

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Abstract

The invention belongs to the technical field of oxygen reduction electrocatalyst preparation, and particularly relates to a modified carbon nitride loaded noble metal-based electrocatalyst and a preparation method and application thereof, the electrocatalyst is an oxygen reduction reaction electrocatalyst, heteroatom doped protonation modified carbon nitride is used as a substrate, and noble metal nanoparticles or clusters are loaded. The noble metal nanoparticles of the electrocatalyst are uniformly and stably distributed on the carbon carrier, and the bonding strength of the noble metal nanoparticles and the carbon carrier is greatly improved, so that the noble metal nanoparticles can effectively keep the structure stable in the electrochemical reaction process of a cathode; and the modified carbon nitride is beneficial to avoiding the reduction of the electrocatalytic activity due to the structural change of the active catalyst, and the performance of the fuel cell is greatly improved due to the relatively high electrocatalytic activity.

Description

technical field [0001] The disclosure belongs to the technical field of oxygen reduction electrocatalyst preparation, and in particular relates to a modified carbon nitride supported noble metal-based electrocatalyst, a preparation method and an application. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Since the beginning of the 21st century, the energy crisis and environmental pollution caused by traditional energy utilization methods have become increasingly severe, and the "clean, low-carbon, safe, and efficient" energy transformation has become the general trend. Renewable energy (such as solar energy, wind energy, hydropower, etc.) is an alternative energy source,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/92
CPCH01M4/926H01M4/8803Y02E60/50
Inventor 孙文平陈亚平潘洪革高明霞刘永锋
Owner ZHEJIANG UNIV
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