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Preparation method of platinum-precious metal-copper ternary alloy nano hollow cube

A nanocube, ternary alloy technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of reduced catalyst activity, inability to fully utilize energy, and difficult to achieve complete oxidation of ethanol, etc. problems, to achieve the effects of high product yield, excellent electrocatalytic activity and stability, and short reaction time

Inactive Publication Date: 2018-09-11
SHAANXI NORMAL UNIV
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  • Abstract
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Problems solved by technology

[0003] In DEFC, the oxidation of ethanol on the platinum catalyst is mainly carried out through a dual pathway, in which the bond energy of the carbon-carbon bond is higher, so it is difficult to completely oxidize ethanol in the actual catalytic process
Not only the energy cannot be fully utilized, but also the intermediates of the side reactions are adsorbed on the surface of the catalyst, resulting in a sharp decrease in the activity of the catalyst.

Method used

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  • Preparation method of platinum-precious metal-copper ternary alloy nano hollow cube
  • Preparation method of platinum-precious metal-copper ternary alloy nano hollow cube
  • Preparation method of platinum-precious metal-copper ternary alloy nano hollow cube

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Embodiment 1

[0031] 1. Preparation of cuprous oxide nanocubes

[0032] Take 1mL of 0.05mol / L CuCl 2 Aqueous solution, 5mL 0.05mol / L sodium polyacrylate aqueous solution with a number average molecular weight of 150000, 1.5mL 0.05mol / L ascorbic acid aqueous solution, add 10mL distilled water, stir and mix for 3 minutes, adjust the resulting mixture with 0.5mol / L sodium hydroxide aqueous solution The pH value of the solution was adjusted to 11.5, and stirred at room temperature for 20 minutes to obtain a cuprous oxide nanocube solution.

[0033] 2. Preparation of platinum-rhodium-copper ternary alloy nano hollow cubes

[0034] Add 0.285mL 0.025mol / L potassium chloroplatinite aqueous solution and 0.005mL 0.025mol / L rhodium chloride aqueous solution to the cuprous oxide nanocube solution obtained in the above step (1), and use 0.5mol / L sodium hydroxide aqueous solution After adjusting the pH value of the solution to 8, it was reacted at 120° C. for 4 hours. After the reaction, use a high-sp...

Embodiment 2

[0036] In the step 1 of embodiment 1, the cupric chloride used replaces with the cupric sulfate of equimolar, and other steps are identical with embodiment 1, obtain platinum-rhodium-copper ternary alloy nano hollow cube (see image 3 ).

Embodiment 3

[0038] In the step 1 of embodiment 1, 0.05mol / L number-average molecular weight is that the sodium polyacrylate aqueous solution of 150000 is replaced with the sodium polyacrylate aqueous solution of 3000 with equal volume 0.05mol / L number-average molecular weight, and other steps are identical with embodiment 1, Obtain platinum-rhodium-copper ternary alloy nano hollow cube (see Figure 4 ).

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Abstract

The invention discloses a preparation method of a platinum-precious metal-copper ternary alloy nano hollow cube. The method takes sodium polyacrylate as a stabilizer and ascorbic acid as a reducing agent, a cuprous oxide nano cube is synthesized firstly, then the cuprous oxide nano cube serves as a template, potassium chloropalladite, precious metal salt (such as chloroauric acid, rhodium chlorideand iridium chloride) are subjected to galvanic displacement with cuprous oxide, and the platinum-precious metal-copper ternary alloy nano hollow cube with the regular shape, uniform size and good dispersibility and stability is obtained. The preparation method is simple and economic, the prepared platinum-precious metal-copper ternary alloy nano hollow cube has the excellent electrocatalytic activity and stability on the ethanol catalytic reaction, has the potential application prospect in the field of direct ethanol fuel cells, and is suitable for industrialized large-scale production.

Description

technical field [0001] The invention belongs to the technical field of preparation of alloy materials, and in particular relates to a method for preparing a platinum-noble metal-copper ternary alloy nano hollow cube. Background technique [0002] The proton exchange membrane fuel cell (PEMFC) using hydrogen as fuel has not been commercialized so far due to problems such as high price, no suitable hydrogen source, and freezing of Nafion membrane below 0 °C. Direct methanol fuel cell (DMFC) has the advantages of convenient fuel storage, transportation and use, small size and high specific energy, but methanol is toxic, volatile, highly flammable, and easily permeates Nafion membrane, causing battery performance to decline. Studies in recent years have found that ethanol is a good substitute fuel for methanol. Direct ethanol fuel cells (DEFCs) have many advantages, such as low toxicity of ethanol, easy availability in daily life, and easy storage and transportation. Since the ...

Claims

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Application Information

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IPC IPC(8): H01M4/92B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/921Y02E60/50
Inventor 陈煜汉术和刘慧敏
Owner SHAANXI NORMAL UNIV
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