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Graphitized carbon layer confined multi-element platinum alloy catalyst and preparation method thereof

A graphitized carbon and catalyst technology, applied in the fields of nano-catalysis and material chemistry, can solve problems such as affecting the initial activity and stability of platinum alloy catalysts, excessive growth, and easy agglomeration of PtM nanoparticles, achieving easy batch preparation, improving Dispersibility, the effect of relieving nanoparticle agglomeration

Pending Publication Date: 2021-03-26
航天氢能(上海)科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the problem that PtM nanoparticles are easy to agglomerate and grow too much during the preparation of platinum alloys, thereby affecting the initial activity and stability of platinum alloy catalysts

Method used

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  • Graphitized carbon layer confined multi-element platinum alloy catalyst and preparation method thereof
  • Graphitized carbon layer confined multi-element platinum alloy catalyst and preparation method thereof
  • Graphitized carbon layer confined multi-element platinum alloy catalyst and preparation method thereof

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preparation example Construction

[0034] The present invention provides a method of preparing a polycyclic platinum alloy catalyst in a graphitized carbon layer, which includes the following steps:

[0035] Step 1, multi-component precursor mixing: a carbon source precursor, a nitrogen source precursor, a transition metal M precursor, mix well in a first solvent, to obtain a dispersion, and then dry the dispersion, and ground Solid powder as a multi-component precursor. The dispersion dried a water bath to evaporate, dried, and the heating temperature of the water bath was 60 to 80 ° C.

[0036] The carbon source precursor comprises any one or two or more kinds of glucose, fructose or citric acid.

[0037] The nitrogen source precursor comprises any one or more mixtures of urea, monanide, dicyandiamide or melamine.

[0038] The transition metal M precursor comprises a transition metal sulfate, nitrate, hydrochloride or acetate mixture; the transition metal M comprises Fe, CO, Ni or Cu Any one or more or more kinds...

Embodiment 1

[0049] This embodiment relates to a method of preparing a carbon nanoplatinoid alloy catalyst, the method comprising the steps of:

[0050] Step 1: Weigh the glucose 10g, about 10 g and cobalt cobalt (control of the three weight ratio of 10: 10: 1), dissolved in 1000 ml of deionized water, ultrasonic dispersion 30min after being placed at 60 ° C The water bath is performed, continuously mechanically stirred during the process, and the sample evaporation is completely, dried, and the solid powder is ground.

[0051] Step 2: Place the solid powder of step 1 in the tube furnace, the firing temperature is 700 ° C, continuous heating for 1 h, and passes into nitrogen as a protective gas.

[0052] Step 3: Mix the solid powder obtained by step 2 with a propionate (according to the weight volume ratio of 1: 2), the ultrasonic dispersion is placed in the reaction flask in the reaction flask, and the temperature is heated to 120 ° C, add A certain amount of chloroplatinic acid solution (con...

Embodiment 2

[0056] This example is a variation of the first embodiment, and other embodiments are in the same embodiment, and the transition metal precursor in step 1 is changed from cobalt acetate and cobalt.

[0057] Effect: The platinum alloy catalyst prepared in this example is a three-dimensional PTCONI / NC @ C catalyst coated with a graphitized carbon layer structure.

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Abstract

The invention discloses a graphitized carbon layer confinement multi-component platinum alloy catalyst and a preparation method thereof. The method comprises the following steps: 1, uniformly mixing acarbon source, a nitrogen source and a transition metal M precursor in a first solvent, drying and grinding to obtain a multi-component precursor; 2, heating the multi-component precursor to obtain atransition metal and a nitrogen-doped M-NC carrier, and continuously introducing protective gas in the heating process; 3, mixing the M-NC carrier with polyol, adding a platinum source precursor, andfully reacting to obtain Pt / M-NC in an initial deposition state; and 4, heating the Pt / M-NC in a reducing atmosphere at a temperature higher than 600 DEG C to obtain PtM / NC@C. According to the invention, firstly, the transition metal M and a nitrogen-doped M-NC carbon material are synthesized; polyhydric alcohol is adopted as a dispersing agent and a reducing agent in the precious metal reductionprocess, the size and distribution uniformity of precious metal nanoparticles are remarkably improved, the phenomena of nanoparticle agglomeration, sintering and the like in the high-temperature alloying process are greatly relieved, and the stability of the alloy catalyst is improved.

Description

Technical field [0001] The present invention belongs to the field of material chemistry, and the nanocatalytic field, and more particularly to a multivocolate alloy catalyst of a graphitic carbon layer and a preparation method thereof. Background technique [0002] In the field of fuel cell, the proton exchange membrane fuel cell (PEMFC) has a high efficiency, larger power, low temperature operation (80-90 ° C), and a wide range of fuel devices, have been gradually applied to transportation, portable power source and other fields. . At present, the improvement of fuel cell performance is mainly limited to an oxygen reduction reaction on the cathode side, mainly due to the slow kinetic characteristics of the cathode oxygen reduction reaction, in order to improve the performance of the fuel cell, it is necessary to increase the amount of noble metal catalyst on the cathode. Compared with the transition metal or nitrogen doped non-platinum catalyst, the platinum catalyst has better ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92H01M4/88
CPCH01M4/926H01M4/8878H01M4/8882Y02E60/50
Inventor 贺阳孙丽君王丽娜林烜孙毅姬峰
Owner 航天氢能(上海)科技有限公司
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