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A kind of graphene nano disk and its preparation method and application

A nanodisk and graphene technology, applied in the field of nanomaterials, can solve the problems of complex production process, high cost of raw materials, low efficiency of formic acid, etc., and achieve the effect of high energy density, uniform shape, and easy availability of raw materials

Active Publication Date: 2020-05-05
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the currently reported catalysts for the conversion of carbon dioxide to formic acid are complex in production process and expensive in raw material costs, mainly based on metal catalysts; moreover, the efficiency of conversion to formic acid is low, and the required overpotential is high

Method used

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  • A kind of graphene nano disk and its preparation method and application
  • A kind of graphene nano disk and its preparation method and application
  • A kind of graphene nano disk and its preparation method and application

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preparation example Construction

[0035] The invention provides a method for preparing a graphene nanodisk with controllable size and uniform appearance, comprising the following steps:

[0036] Using graphene oxide powder as raw material and concentrated nitric acid as solvent, graphene nanodisks with controllable size and uniform shape were prepared by hydrothermal method.

[0037] Preferably the present invention is raw material (the thickness of this graphene can be monolayer also can be multilayer) with the graphene oxide powder prepared by the improved Hummers method; Its concrete steps are as follows:

[0038] Weigh 1g of natural graphite, add 0.74g NaNO 3 with 34 mL of 98% H 2 SO 4 , mixed in an ice-water bath, stirring vigorously; later slowly add 5 g KMnO 4 , keep the temperature below 20°C, then transfer to a water bath at 35°C and stir for 3 hours; after stirring, add 250mL of deionized water, slowly add 4mL of 30%wt H 2 o 2 End the reaction; the obtained bright yellow suspension was first cen...

Embodiment 1

[0050] Embodiment 1: the preparation of the graphene nano disk that particle size is 70nm

[0051] Weigh 400 mg of dried graphene oxide powder, add 40 mL of concentrated nitric acid with a mass fraction of 65%, and stir ultrasonically for 3 hours until a uniformly dispersed solution is formed, then place it in a hydrothermal reaction kettle, and react at 160°C for 6 hours , after the reaction kettle was cooled to normal temperature, using rotary evaporation, centrifugation and dialysis, adding 4 to 5 times of distilled water to wash, collect, and dry to obtain graphene nanodiscs with a particle size of 70nm and a thickness of 1nm.

Embodiment 2

[0052] Embodiment 2: the preparation of the graphene nano-disc with a particle size of 180nm

[0053] Weigh 400mg of dried graphene oxide powder, add 40mL of concentrated nitric acid with a mass fraction of 65%, stir ultrasonically for 3 hours until a uniformly dispersed solution is formed, then place it in a hydrothermal reaction kettle, and react at 140°C for 4 hours , after the reaction kettle was cooled to normal temperature, using rotary evaporation, centrifugation and dialysis, adding 4 to 5 times of distilled water to wash, collect, and dry to obtain graphene nanodisks with a particle size of 180nm and a thickness of 1nm.

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Abstract

The invention relates to a nanomaterial, in particular to a graphene nanodisk with a controllable size and a uniform shape, and a preparation method and application thereof. In the present invention, a single-layer graphene nanodisk with controllable size and uniform morphology is prepared by a simple one-step hydrothermal method for the first time, which is a low-cost carbon-based material rich in oxygen defects and has excellent CO 2 Catalytic reduction performance. At an overpotential of 430mV, the catalytic CO 2 The Faradaic efficiency of generating formic acid can reach 87%, the initial overpotential is as low as 230mV, and there are no other by-products, which improves many problems faced by carbon-based catalysts. This is also the reported carbon-based material to catalyze CO reduction. 2 The best performance to generate formic acid. The preparation method of the graphene nanodisk provided by the invention has the advantages of easily available raw materials and simple process flow, greatly reducing the production cost, and being favorable for large-scale industrial application; and the electrolyte is a common salt solution without adding any organic matter.

Description

technical field [0001] The invention relates to a nanometer material, in particular to a graphene nanodisk with controllable size and uniform appearance, its preparation method and application. Background technique [0002] Since the industrial revolution, with the rapid progress of human production and life, more and more carbon dioxide has been emitted into the atmosphere. This continuous increase in the emission of carbon dioxide has begun to gradually have an impact on the earth's environment. In addition, CO 2 Global warming caused by massive emissions has become one of the most concerned environmental issues in the world. Therefore, the efficient use of greenhouse gas CO 2 The conversion into liquid fuels with added value is of great research value. Due to the mild reaction conditions and the controllability of the reaction products, the electrocatalytic reduction of carbon dioxide (CO 2 RR) are economically valuable small molecule products that have emerged as pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/18C25B3/04C01B32/184C25B3/25
CPCC01B32/184B01J21/18C25B3/25B01J35/33
Inventor 徐维林杨发阮明波宋平
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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