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Iron-nickel polyphenol network nano-composite carbon material electrocatalyst based on chitosan modified cellulose aerogel and preparation method of iron-nickel polyphenol network nano-composite carbon material electrocatalyst

A nano-composite material, modified cellulose technology, applied in circuits, electrical components, battery electrodes, etc., can solve problems such as the single synthesis cost of precursors, and achieve the effects of excellent limiting current, simple operation steps, and good conductivity

Active Publication Date: 2021-09-17
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems existing in the existing fuel cell catalysts and overcome the defects of the prior art. At present, fuel cell catalysts generally face the single obstacle of the precursor and the problem of synthesis cost, and use chitosan as the "improvement method" of nanocellulose. Introduce more effective functional groups, prepare chitosan / nanocellulose composite airgel as a porous carbon carrier, and prepare iron-nickel supramolecular network framework nanocomposite electrocatalysts, which have high onset potential and half-slope potential , excellent limiting current, excellent stability and good methanol tolerance, has the advantages of strong resistance to methanol poisoning

Method used

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  • Iron-nickel polyphenol network nano-composite carbon material electrocatalyst based on chitosan modified cellulose aerogel and preparation method of iron-nickel polyphenol network nano-composite carbon material electrocatalyst
  • Iron-nickel polyphenol network nano-composite carbon material electrocatalyst based on chitosan modified cellulose aerogel and preparation method of iron-nickel polyphenol network nano-composite carbon material electrocatalyst
  • Iron-nickel polyphenol network nano-composite carbon material electrocatalyst based on chitosan modified cellulose aerogel and preparation method of iron-nickel polyphenol network nano-composite carbon material electrocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] This example shows a C CTS-CA @Fe 0.64 Ni 0.36 Catalyst synthesis method.

[0057] (1) Weigh 3g of cotton in a three-neck round bottom flask, add 13mL of concentrated sulfuric acid (98wt%) and 13mL of deionized water, stir at a constant speed in a 45°C water bath for 1.5h, then add 50mL of deionized water to dilute sulfuric acid to terminate After the hydrolysis reaction, the supernatant was removed after standing still. Then centrifuge the lower layer suspension in a high-speed centrifuge (10000rpm / min, 10min / time) until the milky white liquid appears, and collect the milky white liquid in turn to obtain the nanofiber crystal (CNC) solution, and put the nanofiber crystal (CNC) solution into Dialyze in the dialysis bag MD44-14000 until the solution becomes neutral and collect for later use.

[0058] (2) 2 g of chitosan was dissolved in 100 mL of acetic acid (1 wt%) solution, and magnetically stirred for 4 h.

[0059] (3) Take 100mL nanofiber crystal solution and 10...

Embodiment 2

[0069] This example shows a kind of by nanomaterial C CTS-CA @Fe 0.64 Ni 0.36 Electrochemical performance studies of catalysts.

[0070] The Nafion added in the catalyst preparation process of the present invention is produced by Aldrich sigma company, and the concentration is 5%.

[0071] Pipette 7ul of the catalyst onto the working electrode, wait for it to dry naturally and then repeat this step 3 times, and then slowly enter the working electrode into the oxygen-saturated 0.1M KOH electrolyte. Bubbles are generated on the electrode, and the electrolyte should be continuously fed with oxygen throughout the test process to ensure oxygen saturation.

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Abstract

The invention belongs to the technical field of proton membrane fuel cell catalysts, and discloses an iron-nickel polyphenol network nano-composite carbon material electrocatalyst based on chitosan modified cellulose aerogel and a preparation method of the iron-nickel polyphenol network nano composite carbon material electrocatalyst. The preparation method comprises steps of using chitosan as a modifier of nano cellulose to prepare chitosan / nano cellulose composite aerogel as a catalyst carrier; preparing an iron-nickel doped CS / CNC-coated FeNi precursor with a supramolecular framework through water bath oscillation, and finally performing high-temperature carbonization to obtain the iron-nickel supramolecular network framework nanocomposite electrocatalyst. The CCTS-CA@Fe0.64Ni0.36 nano composite material prepared by the preparation method disclosed by the invention has good conductivity, high chemical stability and thermal stability and good electrocatalytic property, can be used as an efficient electrocatalyst capable of replacing traditional commercial Pt / C, and has great potential application value.

Description

technical field [0001] The invention belongs to the technical field of proton membrane fuel cell catalysts, and specifically relates to an iron-nickel polyphenol network nanocomposite carbon material electrocatalyst based on chitosan-modified cellulose aerogel and a preparation method thereof. Background technique [0002] The current research on oxygen reduction electrocatalysts mostly focuses on compounds based on transition metal (Fe, Co, Ni, Mn) elements, mainly including oxides and their composite materials. Transition metals are often used to prepare electrocatalysts because of the diversity of adsorption sites and empty d-electron orbitals that can form chemisorption bonds due to unfilled orbitals and unpaired electrons. Compared with single metals, bimetallic alloys may have higher catalytic activity, and even exhibit excellent catalytic activity in oxygen evolution and oxygen evolution reactions, and have attracted more and more attention from researchers. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/86H01M4/90
CPCH01M4/9041H01M4/9083H01M4/88H01M4/8605Y02E60/50
Inventor 肖高林依婷
Owner FUZHOU UNIV
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