Method for polypeptide biomimetic preparation of platinum catalyst for fuel battery and application of platinum catalyst for fuel battery

A catalyst, platinum nanotechnology, used in chemical instruments and methods, physical/chemical process catalysts, battery electrodes, etc., can solve problems such as voltage and current instability, affect performance, and uneven nanomaterials, and achieve mild and good conditions. Anti-agglomeration, strong tunable denaturation effect

Inactive Publication Date: 2015-04-08
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is greatly affected by the voltage and current, and the voltage and current may be unstable, resulting in uneven preparation of nanomaterials and affecting performance.

Method used

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  • Method for polypeptide biomimetic preparation of platinum catalyst for fuel battery and application of platinum catalyst for fuel battery
  • Method for polypeptide biomimetic preparation of platinum catalyst for fuel battery and application of platinum catalyst for fuel battery
  • Method for polypeptide biomimetic preparation of platinum catalyst for fuel battery and application of platinum catalyst for fuel battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Peptide I 3 K can self-assemble into a one-dimensional nanofiber structure with a diameter of about 10 nm and a length of several microns at room temperature, and this fiber can be used as a template for platinum nanofibers. At room temperature, the I 3 K aqueous solution and K 2 PtCl 4 Aqueous solutions are mixed, where K 2 PtCl 4 The aqueous solution concentration is 1mM, I 3 The concentration of K is 0.5mM, 0.2mM, 0.1mM respectively, and it is formulated into I 3 K and K 2 PtCl 4 Mixed solutions with concentration ratios of 1:2, 1:5, and 1:10, after mixing evenly, add 1mM NaBH 4 The aqueous solution was reduced, and the one-dimensional platinum nanofiber suspension reacted for 0.5 hours was centrifuged at 10,000 rpm for 7 minutes, then repeatedly added with water for at least 3 times, and then ultrasonically dispersed in the aqueous solution again.

[0076] The prepared one-dimensional platinum nanofiber dispersion was drop-coated on a clean glassy carbon el...

Embodiment 2

[0085] Peptide I 3 H, I 3 CGK, I 4 K 2 1. Fmoc-FFGCK can self-assemble into a one-dimensional nanofiber structure with a diameter of about 10 nm and a length of several microns under mild conditions, and the fiber can be used as a template for platinum nanofibers. Will I 3 K aqueous solution and K 2 PtCl 4 Aqueous mixing, K 2 PtCl 4 The concentration of the aqueous solution is 1mM and the concentration of the peptide template is kept constant at 0.1mM, so that the concentration ratio of the peptide template and the platinum precursor is 1:10. After mixing evenly, add 1mM NaBH 4 The aqueous solution was reduced, sealed and shaken for 1 minute, then allowed to stand for 0.5 h, centrifuged and electrochemically characterized (the method was the same as in Example 1). The ECSA of one-dimensional platinum nanofibers prepared by each template is shown in Table 3. It can be seen that the catalytic activity of one-dimensional platinum nanofibers prepared under different templa...

Embodiment 3

[0093] with I 3 K is template, Pt precursor is H 2 PtCl 6 , the concentration ratio of 1:10 remains unchanged, and the peptide solution is mixed with K 2 PtCl 4 Mix the solutions so that the concentration ratio is 1:10. After mixing evenly, reduce them with 1mM sodium borohydride + 1mM ascorbic acid, or 1mM formic acid, or 1mM hydrazine hydrate aqueous solution, and shake them in a closed place for one minute, then place them at 80°C to continue After reacting for 24 hours, perform electrochemical characterization after centrifugation (the method is the same as in Example 1). The ECSA of the one-dimensional platinum nanofibers reduced by each reducing agent is shown in Table 5. It can be seen that the catalytic activity of the one-dimensional platinum nanofibers reduced by each reducing agent is higher than that of the commercial Pt / C catalyst.

[0094] Table 5. ECSA of 1D Pt nanofibers prepared with different reducing agents

[0095]

[0096] The electrocatalytic expe...

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Abstract

The invention relates to a platinum nanometer catalyst. The platinum nanometer catalyst is a one-dimensional continuous platinum nanometer line adsorbed with platinum nanometer particles on the surface by using the self-assembly aggregate of an amphiphilic polypeptide molecule as the template. The platinum catalyst disclosed by the invention has larger length-diameter ratio, less defective sites, less crystal lattice boundaries and good conductivity, and simultaneously has better resistance against aggregation and loss, and the one-dimensional morphology of the platinum nanometer catalyst is beneficial for transferring of reaction materials; the one-dimensional nanometer line of the platinum nanometer catalyst can form a self-supporting system so a carbon carrier is unnecessary, and the reduction of the catalytic activity caused by carrier corrosion effect during use is avoided.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a platinum nano-catalyst used in fuel cells and its preparation method and application. Background technique [0002] Green, high-efficiency, low-energy consumption and portable organic small molecule fuel cells, such as direct methanol fuel cells and direct formic acid fuel cells, are currently one of the hotspots in the field of fuel cell technology development. Platinum-based nanoparticles are widely used catalysts for fuel cells, but due to the high activity of surface atoms with more lattice boundaries, defect sites and low coordination numbers, nanoparticles are very prone to agglomeration during use, resulting in electrochemical Effective activation area and service life decrease rapidly. A certain degree of ordered assembly of platinum nanoparticles is expected to overcome the problems of agglomeration and loss, thereby improving their activity and stability. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42H01M4/92B82Y40/00
CPCY02E60/50
Inventor 王继乾徐海赵芳陶凯杨亚珍夏道宏
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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