Three-dimensional porous nickel oxide and nitrogen doped graphene quantum dot composition as well as preparation method and application thereof

A graphene quantum dot, three-dimensional porous technology, applied in the direction of chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problems of electrocatalyst structure, composition and electrocatalytic performance difficulties, and achieve superior electrocatalysis Catalytic performance, increasing specific surface area, improving the effect of oxygen evolution electrocatalytic performance

Inactive Publication Date: 2017-11-07
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is still difficult to precisely control the structure, composition and electrocatalytic performance of the target electrocatalyst, which requires researchers to continuously explore and summarize

Method used

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  • Three-dimensional porous nickel oxide and nitrogen doped graphene quantum dot composition as well as preparation method and application thereof
  • Three-dimensional porous nickel oxide and nitrogen doped graphene quantum dot composition as well as preparation method and application thereof
  • Three-dimensional porous nickel oxide and nitrogen doped graphene quantum dot composition as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1. Preparation of nitrogen-doped graphene quantum dots

[0024] Synthesis of Nitrogen-Doped Graphene Quantum Dots by Modified Microwave Method [See: Lv J-J, Zhao J, Fang H, Jiang L-P, Li L-L, Ma J*, and Zhu J-J*, Incorporating Nitrogen-Doped GrapheneQuantum Dots and Ni 3 S 2 Nanosheets: A Synergistic Electrocatalyst with HighlyEnhanced Activity for Overall Water Splitting, Small, 2017, 13(24), 1700264], including the following steps:

[0025] (1) Take an appropriate amount of deseeded watermelon pulp, mash it into juice, put it into a 100mL polytetrafluoroethylene reactor, conduct hydrothermal treatment at 180°C for 12 hours, dialyze the obtained black carbon gel, and dry it in vacuum;

[0026] (2) Take 0.5 g of the prepared carbon gel and place it in a quartz boat after being ground, and heat up to 800 °C for 30 minutes in a tube furnace under a nitrogen atmosphere at a rate of 10 °C / min. Nitric acid and 30 mL of concentrated sulfuric acid were carefully ...

Embodiment 2

[0027]Embodiment 2. in-situ growth in the preparation of nickel oxide and nitrogen-doped graphene quantum dot composite on the surface of nickel foam, the specific steps are as follows:

[0028] (1) Ultrasonic cleaning of nickel foam (size: 0.5cm x 0.5cm) with ethanol and water for 30 minutes, and then drying it in a vacuum oven at 40°C for use;

[0029] (2) Take 5mL purified and quantified nitrogen-doped graphene quantum dot aqueous solution (0.5mg / mL) and 20mL oxidation etchant trioctylphosphine oxide aqueous solution (0.95mg / mL), mix well, transfer to 30mL polytetrafluoroethylene Vinyl fluoride reactor, add cleaned nickel foam (size: 0.5cm x 0.5cm), carry out hydrothermal treatment at 180°C for 12 hours, after cooling to room temperature, the product is rinsed several times with secondary water and ethanol and heated at 50 Drying in a vacuum drying oven at ℃ to obtain a composite of nickel oxide and nitrogen-doped graphene quantum dots grown on the surface of nickel foam in...

Embodiment 3

[0030] Embodiment 3. the characterization of in-situ growth on the nickel foam surface nickel oxide and nitrogen-doped graphene quantum dot composites, including:

[0031] (1) The morphology and structure of related materials were characterized by scanning electron microscopy ( figure 1 ), the test results show that the obtained composite retains the three-dimensional porous structure of nickel foam, and a large number of micron-sized holes are oxidized and etched on the surface, which is conducive to increasing the specific surface area;

[0032] (2) Fourier-infrared spectroscopy (FT-IR) characterizes the functional groups contained in the material ( figure 2 A), the results show that the resulting composite material contains -COOH, -OH and other functional groups from nitrogen-doped graphene quantum dots and Ni-O groups from nickel oxide, which preliminarily illustrates the formation of the composite;

[0033] (3) Fluorescence characteristics of materials characterized by ...

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Abstract

The invention discloses a three-dimensional porous nickel oxide and nitrogen doped graphene quantum dot composition which is prepared from foamed nickel as a matrix, a great number of micron-order pores in the surface of the foamed nickel in an oxidation etching manner, meanwhile a three-dimensional porous structure of the foamed nickel is maintained, and the nickel oxide and nitrogen doped graphene quantum dot composition is formed on the surface of the foamed nickel. The composition has excellent electric catalysis upon oxygen evolution reactions in alkali systems, and overpotential of electrolysis water oxygen evolution reactions can be effectively reduced. The invention further discloses a preparation method of the composition.

Description

technical field [0001] The invention relates to the field of electrocatalytic energy, in particular to an oxidation etching technology, which etches holes on the surface of the catalyst, and combines nickel oxide and nitrogen-doped graphene quantum dots to obtain a composite material for improving the electrocatalytic performance of the oxygen evolution reaction . Background technique [0002] At present, with the rapid consumption of fossil fuels and the increasingly serious environmental pollution, human beings urgently need renewable and clean energy. Hydrogen energy, as the most convenient carrier of energy, is considered to be one of the most ideal clean energy sources. Electrolysis of water is one of the effective methods to produce high-purity hydrogen, that is, an external voltage is applied in the electrolytic cell, and the water undergoes a decomposition reaction to produce hydrogen and oxygen. Among them, the half-reaction of oxygen evolution (OER) in the hydrol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C25B1/04
CPCB01J27/24B01J35/0033B01J35/04C25B1/04Y02E60/36
Inventor 吕晶晶房华朱俊杰
Owner NANJING UNIV
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