α-co(oh) 2 /ppy/go nanosheets and oer electrocatalytic modified electrodes based on them

A technology for modifying electrodes and nanosheets, applied in the field of electrochemical catalysis, which can solve the problems of high price, scarce content, poor stability, etc., and achieve the effect of fast reaction speed, good linearity and good linearity

Active Publication Date: 2021-06-25
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its scarcity, high price and poor stability have greatly limited its large-scale application.

Method used

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  • α-co(oh) <sub>2</sub> /ppy/go nanosheets and oer electrocatalytic modified electrodes based on them
  • α-co(oh) <sub>2</sub> /ppy/go nanosheets and oer electrocatalytic modified electrodes based on them
  • α-co(oh) <sub>2</sub> /ppy/go nanosheets and oer electrocatalytic modified electrodes based on them

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1 α-Co(OH)2 / PPy / GO nanosheets

[0035] (1) The preparation method is as follows:

[0036] 1) Preparation of GO nanosheets: Add 67.5mL of concentrated sulfuric acid, 2.0g of high-purity graphite and 1.6g of NaNO into a three-neck flask 3 , and stir evenly, keep the system temperature below 5°C, add 9g KMnO to the mixed solution within one hour 4 , and then placed in a 36°C water bath for 0.5h. After standing at room temperature for 14 days, dilute with 560 mL of 60°C water, add H 2 o 2 Until the solution turns bright yellow, centrifuge (rmp=10000) while it is hot, wash to neutrality, and vacuum-dry at 50° C. to obtain GO nanosheets.

[0037] 2) PPy / GO nanosheets: Add 0.2g GO nanosheets to 100mL deionized water for ultrasonic dispersion, then add 0.2g pyrrole (Py), add 1.2g FeCl after ultrasonic dispersion 3 ·6H 2 O, continue to sonicate for 0.5h, centrifuge, wash and dry in vacuum to obtain PPy / GO nanosheets.

[0038] 3) α-Co(OH) 2 / PPy / GO nanosheet prepa...

Embodiment 2

[0042] Example 2 Based on α-Co(OH) 2 OER Electrocatalytic Modification Electrode of / PPy / GO Nanosheets

[0043] (1) The preparation method is as follows:

[0044] 1) Take 2mg of the dry α-Co(OH) prepared in Example 1 2 / PPy / GO nanosheets, add 1mL of ethanol, ultrasonically disperse for 20min, and obtain a black suspension with a concentration of 2mg / mL, which is the composite modifier and is set aside.

[0045] 2) Electrode treatment: the glassy carbon electrode was first polished with 0.3 μM aluminum oxide suspension on a polishing cloth, then ultrasonically cleaned with deionized water, and then 0.05 μM aluminum oxide suspension Polish it to a mirror surface on a polishing cloth, and finally clean it ultrasonically with ethanol and deionized water, dry it with high-purity nitrogen, and set it aside.

[0046] 3) Preparation of modified electrode: Use a microsampler to pipette 5 μL of the composite modifier prepared in step 1) and drop-coat it on the surface of a polished gla...

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Abstract

The present invention relates to α‑Co(OH) 2 / PPy / GO nanosheets and their modified electrodes for OER electrocatalysis. The electrode includes a glassy carbon electrode as a base electrode, and polypyrrole / graphene oxide (PPy / GO) nanosheets modified by α-cobalt hydroxide attached to the glassy carbon electrode. Due to the presence of α-cobalt hydroxide, the reaction rate of water splitting is enhanced, and only a low overpotential is required, so that this nanomaterial modified electrode shows high electrochemical activity and good stability in water splitting. .

Description

technical field [0001] The invention belongs to the field of electrochemical catalysis, and in particular relates to an electrocatalytic modified electrode and its preparation method and application. Background technique [0002] Based on the high specific energy content and carbon-neutral combustion products of hydrogen, it has long been considered as an alternative fuel to replace fossil fuels and meet global energy consumption. Two half-reactions for environmentally friendly hydrogen production powered by renewable energy have been widely explored. [0003] Hydrogen production by electrolysis of water can be said to be rich in raw materials, simple in method, and hydrogen has a very wide range of applications. Compared with the hydrogen evolution reaction (HER), the oxygen evolution reaction (OER), a multi-step, four-electron process, is limited by its slow kinetics. The key to water electrolysis is to increase the OER activity by adding catalysts. Conventional Ir / Ru-b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/091C25B1/04B01J31/26B82Y30/00B82Y40/00
CPCY02E60/36
Inventor 茆卉郭玺傅源琳宋溪明
Owner LIAONING UNIVERSITY
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