Process for preparing nano structured super platinum film carbon electrodes

A nanostructure, carbon electrode technology, applied in battery electrodes, structural parts, circuits, etc., to achieve the effects of easy availability of raw materials, wide scanning potential window, and simple preparation method

Inactive Publication Date: 2005-09-14
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although a monolayer of Pt deposited on the surface of metal nanoparticles has been used as an electrocatalyst for oxygen reduction and hydrogen oxidation reactions (Brussel, M.V et al Electrochem. Commun. 2002, 4, 808.), multi-step cycling on the surface of nanoparticles The Pt deposition layer prepared by the underpotential deposition / redox displacement technology has not been reported in the catalytic application so far.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: Preparation of colloidal platinum. All glassware in the experiment was filled with freshly prepared aqua regia HCl:HNO before use. 3 (volume ratio 3:1) washing solution, and then rinse with distilled water. Add 1ml of 1% (mass percentage) chloroplatinic acid solution into 100ml of water, heat to boiling, stir vigorously for one minute, then quickly add 3ml of 1% (mass percentage) sodium citrate solution, then boil and heat for 30 minutes to obtain Colloidal platinum solution. The obtained platinum sol nanoparticles were characterized by a transmission electron microscope with an average diameter of 6±1 nm. The solution was stored at 4°C for future use.

Embodiment 2

[0015] Example 2: Nanostructure platinum ultra-thin film modified glassy carbon electrode. The preparation of colloidal platinum was the same as in Example 1. Glassy carbon electrodes are used with 1.0μm and 0.3μm α-Al before use 2 o 3 The powder is continuously polished, and after each polishing, it is rinsed with water and ultrasonicated for about 5 minutes. Finally, the electrodes were sonicated in absolute ethanol for 5 minutes and rinsed with absolute ethanol. Then put the clean glassy carbon electrode into the absolute ethanol solution of 1mM 4-aminobenzoic acid + 100mM lithium perchlorate, and use Ag / Ag + In the potential range of 0 to +1.0V for the reference electrode, the potential was scanned 20 times at a scan rate of 10mV / s, and the electrode was taken out and rinsed with water to prepare a 4-aminobenzoic acid monolayer film-modified electrode. Immerse the glassy carbon electrode modified with 4-aminobenzoic acid into an aqueous solution of 8% (mass percent) po...

Embodiment 3

[0016] Embodiment 3: Colloidal platinum is prepared with embodiment 1. Put the clean glassy carbon electrode into the absolute ethanol solution of 50mM 4-aminobenzoic acid+100mM lithium perchlorate, and use Ag / Ag + In the potential range of 0 to +1.0V for the reference electrode, the potential was scanned 20 times at a scan rate of 10mV / s, and the electrode was taken out and rinsed with water to prepare a 4-aminobenzoic acid monolayer modified electrode. Immerse the glassy carbon electrode modified with 4-aminobenzoic acid in an aqueous solution of 1% (mass percentage) polydiallyldimethylammonium chloride for 60 minutes to carry out electrostatic assembly of polyelectrolytes; take out the modified electrode, water After rinsing, immerse the glassy carbon electrode modified with the precursor film in a colloidal platinum solution with an average diameter of 6±1nm for 14 hours to prepare a platinum nanoparticle monolayer film modified electrode; after rinsing the electrode with ...

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Abstract

This invention relates to a method for preparing a super thin film of a nm structure, which inserts a carbon electrode with 4-aminobenzoate functional process into polydiene propyl dimethyl ammonia chloride solution for electrostatic assembly of polyelectrolyte to be dipped in gel Pt solution after cleaned and undergone with nm particle assembly. Said electrode is immersed into AgH2SO4 solution for electrochemical scanning to deposit Ag layers under potential on Pt nm particle surface and is transferred into the perchloric acid solution containing potassium chloroplatinite to be dipped in open circuit. The electrode is cleaned and two reactions of under potential deposition/oxidation-reduction and displacement are repeated to get a Pt nm particle single layer membrane electrode decorated by multiple deposited Pt super-thin layers.

Description

technical field [0001] The invention relates to a preparation method of a nano-structure platinum ultra-thin film carbon electrode, in particular to a preparation method of a nano-structure platinum ultra-thin film modified carbon electrode which catalyzes oxygen reduction and hydrogen precipitation. Background technique [0002] Electrocatalytic reactions are an important part of electrochemistry and play a very important role in emerging application technologies related to the environment and energy, such as fuel cells. Among many electrochemical reactions, the hydrogen evolution reaction and the four-electron oxygen reduction reaction in acidic media have been extensively studied. The former has important applications in hydrogen-oxygen fuel cells, metal electrodeposition, etc.; the latter is the cathode reaction of many fuel cells. Among these catalysts with numerous reactions, platinum and platinum-based materials remain the most effective electrocatalysts for oxygen r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/96
CPCY02E60/50
Inventor 董绍俊黄明华
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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