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Preparation method for platinum-silver alloy hollow nanoflower

A hollow nano, platinum-silver alloy technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of poor stability, low catalyst activity, restricting development, etc., to avoid agglomeration, purity High, high product yield effect

Active Publication Date: 2017-10-20
SHAANXI NORMAL UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Formic acid fuel cells under alkaline conditions have problems such as low catalyst activity and poor stability, which seriously restrict their development.

Method used

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  • Preparation method for platinum-silver alloy hollow nanoflower
  • Preparation method for platinum-silver alloy hollow nanoflower
  • Preparation method for platinum-silver alloy hollow nanoflower

Examples

Experimental program
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Effect test

Embodiment 1

[0029] 1. Preparation of silver nanoflowers

[0030] Ultrasonically mix 0.1mL 0.1mol / L silver nitrate aqueous solution, 0.2mL 0.5mol / L PAAS aqueous solution with a number average molecular weight of 5100, and 0.2mL 0.5mol / L ascorbic acid aqueous solution, and adjust with 0.5mol / L sodium hydroxide aqueous solution The pH value of the resulting mixed solution was 8, stirred and reacted at room temperature for 1.5 hours, and obtained the silver nanoflower solution (see figure 1 and figure 2 ).

[0031] 2. Preparation of platinum-silver alloy hollow nanoflowers

[0032] Add 0.1mL 0.024mol / L potassium chloroplatinite aqueous solution and 0.05mL 0.5mol / L number average molecular weight to the silver nanoflower solution that step 1 obtains and be the PAAS aqueous solution of 5100, adjust its pH value with 0.1mol / L nitric acid aqueous solution to 3, stirred and reacted at room temperature for 10 minutes, centrifuged, washed, and dried to obtain platinum-silver alloy hollow nanoflo...

Embodiment 2

[0034] In the step 1 of embodiment 1, 0.2mL 0.5mol / L number average molecular weight is that the sodium polyacrylate aqueous solution of 5100 is replaced with the sodium polyacrylate aqueous solution of 0.5mL 0.5mol / L number average molecular weight that is 2100, other steps and embodiment 1 Same, obtain platinum-silver alloy hollow nanoflower (see Figure 5 ).

Embodiment 3

[0036] In step 2 of Example 1, 0.1mL of 0.024mol / L aqueous solution of potassium chloroplatinite was replaced with 0.5mL of 0.024mol / L aqueous solution of potassium chloroplatinite, and other steps were the same as in Example 1 to obtain platinum-silver alloy hollow nano flower (see Figure 6 ).

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Abstract

The invention discloses a preparation method for a platinum-silver alloy hollow nanoflower. The method comprises the following steps: taking sodium polyacrylate as a stabilizer and taking ascorbic acid as a reducing agent; reducing silver nitrate at the room temperature to synthesize a silver nanoflower; and introducing potassium chloroplatinite as a platinum source through galvanic reducing process, thereby directly obtaining the platinum-silver alloy hollow nanoflower. The preparation method is simple and economical; the obtained platinum-silver alloy hollow nanoflower is regular in shape and is uniform in dimension, has ultrahigh catalytic activity and stability in an alkaline formic acid fuel cell, has a potential application prospect in the fuel cell field, and is suitable for industrial large-scale production.

Description

technical field [0001] The invention relates to a method for preparing platinum-silver alloy hollow nanoflowers. The nanometer material, as a fuel cell catalyst, exhibits superhigh catalytic activity and stability to potassium formate and sodium formate under alkaline conditions. Background technique [0002] With the rapid development of industrial technology, people pay more and more attention to fuel cells. Especially direct formic acid fuel cells. Formic acid fuel cells have outstanding advantages such as higher electromotive force, reasonable energy density, and lower fuel crossover. Due to the slow ORR kinetics of the cathode under acidic conditions, fuel cells under alkaline conditions have attracted much attention in recent years. Formic acid fuel cells under alkaline conditions have problems such as low catalyst activity and poor stability, which seriously restrict their development. Therefore, finding a catalyst with high activity and high stability is the goal ...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/92B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/8825H01M4/921H01M4/928Y02E60/50
Inventor 陈煜汉术和刘慧敏
Owner SHAANXI NORMAL UNIV
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