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Preparation method of a two-dimensional porous noble metal-based nanocatalyst

A nano-catalyst and noble metal technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of electrocatalytic performance decline, atom utilization rate reduction, surface atom reduction, etc., and achieve the effect of ingenious methods

Active Publication Date: 2019-07-09
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some methods can prepare two-dimensional structures with smooth and flat surfaces, the high surface energy and the unsaturation of surface coordination atoms make these sheets pile up on each other, which greatly reduces the number of accessible surface atoms, which eventually leads to a decrease in atom utilization. , the electrocatalytic performance decreases

Method used

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  • Preparation method of a two-dimensional porous noble metal-based nanocatalyst
  • Preparation method of a two-dimensional porous noble metal-based nanocatalyst
  • Preparation method of a two-dimensional porous noble metal-based nanocatalyst

Examples

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Effect test

Embodiment 1

[0041]A method for preparing a two-dimensional porous noble metal-based nanocatalyst by synthesizing a two-dimensional coordination polymer, comprising the following steps:

[0042] (1) Pipette 5mL 0.05M Na 2 PdCl 4 solution and 5mL 0.05M K 2 Ni(CN) 4 solution, ultrasonically mixed to form light yellow cyanogel;

[0043] (2) Transfer to a 15mL reaction kettle, heat and react in an oven at 120°C for 2 hours to obtain a light blue coordination polymer precipitate;

[0044] (3) Centrifuge the precipitate in step (2), wash and dry it, put it into a tube furnace, and oxidize and calcinate it with oxygen at 350° C. for 1 hour to obtain black oxide powder;

[0045] (4) Put the black oxide powder obtained in step (3) into a tube furnace, and reduce it with hydrogen at 300° C. for 2 hours to obtain the two-dimensional porous noble metal PdNi nanocatalyst.

Embodiment 2

[0047] A method for preparing a two-dimensional porous noble metal-based nanocatalyst by synthesizing a two-dimensional coordination polymer, comprising the following steps:

[0048] (1) Pipette 5mL 0.05M Na 2 PdCl 4 solution and 5mL 0.05M K 2 Ni(CN) 4 solution, ultrasonically mixed to form light yellow cyanogel;

[0049] (2) Transfer to a 15mL reaction kettle, heat and react in an oven at 160°C for 2 hours to obtain a light blue coordination polymer precipitate;

[0050] (3) Centrifuge the precipitate in step (2), wash and dry it, put it into a tube furnace, and oxidize and calcinate it with oxygen at 350° C. for 1 hour to obtain black oxide powder;

[0051] (4) Put the black oxide powder obtained in step (3) into a tube furnace, and reduce it with hydrogen at 300° C. for 2 hours to obtain the two-dimensional porous noble metal PdNi nanocatalyst.

Embodiment 3

[0053] A method for preparing a two-dimensional porous noble metal-based nanocatalyst by synthesizing a two-dimensional coordination polymer, comprising the following steps:

[0054] (1) Pipette 5mL 0.05M Na 2 PdCl 4 solution and 5mL 0.05M K 2 Ni(CN) 4 solution, ultrasonically mixed to form light yellow cyanogel;

[0055] (2) Transfer to a 15mL reaction kettle, heat and react in an oven at 200°C for 2 hours to obtain a light blue coordination polymer precipitate;

[0056] (3) Centrifuge the precipitate in step (2), wash and dry it, put it into a tube furnace, and oxidize and calcinate it with oxygen at 350° C. for 1 hour to obtain black oxide powder;

[0057] (4) Put the black oxide powder obtained in step (3) into a tube furnace, and reduce it with hydrogen at 300° C. for 2 hours to obtain the two-dimensional porous noble metal PdNi nanocatalyst.

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Abstract

The invention discloses a preparation method of a two-dimensional porous precious metal-base nano-catalyst. The preparation method comprises the steps of carrying out coordination substitution reaction on precursors including a precious metal compound and transition metal cyanide, so as to generate a two-dimensional coordination polymer nanosheet, and carrying out oxygen oxidation and hydrogen gas reduction, so as to obtain the two-dimensional porous precious metal-base nano-catalyst. The two-dimensional sheet-type precious metal-base nano-catalyst prepared by virtue of the preparation method has a high sequential alloying structure and a rough and porous surface, and an electrochemical study proves that the nano-catalyst has excellent electro-catalytic property.

Description

technical field [0001] The invention relates to a method for preparing a noble metal-based two-dimensional nanocatalyst, in particular to a method for synthesizing a two-dimensional coordination polymer and preparing a two-dimensional porous noble metal-based nanocatalyst through oxygen oxidation and hydrogen reduction. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) has the advantages of high energy conversion efficiency, low pollution, fuel diversification, storage and portability, etc. It is very suitable for portable or fixed power system devices such as mobile phones, notebook computers, and automobiles, and is recognized Efficient and green energy conversion technology. [0003] Studies have shown that the catalytic properties of noble metal-based nanomaterials are closely related to their structural morphology (including geometric configuration, exposed crystal planes, size distribution and dimensions, etc.) and components. Therefore, the opt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90
CPCH01M4/90H01M4/9008Y02E60/50
Inventor 徐林刘祯圆李家辉唐亚文孙冬梅
Owner NANJING NORMAL UNIVERSITY