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Preparation method of boron carbide nanosheets/boron-doped graphene quantum dots and its application to ammonia production by electroreduction

A technology of graphene quantum dots and nanosheets, which is applied in the field of electrochemical catalysis, can solve the problems of metal leakage with low Faraday efficiency, and achieve good application prospects, good adsorption, excellent recyclability and electrochemical stability.

Active Publication Date: 2020-07-14
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although non-noble metal catalysts (such as Fe, Mo-based catalysts) have been greatly developed in recent years (S.Chen, S.Perathoner, C.Ampelli, C.Mebrahtu, D.Su, G.Centi. Electrocatalytic synthesis of ammonia at room temperature and atmospheric pressure from water and nitrogen on a carbon-nanotube-based electrocatalyst, Angew. Chem., Int. Ed., 2017, 56, 2699–2703; L. Zhang, X. Ji, X. Ren, Y. Ma, X. Shi, Z. Tian, ​​A.M. Asiri, L. Chen, B. Tang, X. Sun. Electrochemical ammonia synthesis via nitrogen reduction reaction on MoS 2 catalyst: theoretical and experimental studies, Adv. Mater., 2018, 30, 1800191), but its low Faraday efficiency and metal leakage still limit its further application in the field of NRR

Method used

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  • Preparation method of boron carbide nanosheets/boron-doped graphene quantum dots and its application to ammonia production by electroreduction
  • Preparation method of boron carbide nanosheets/boron-doped graphene quantum dots and its application to ammonia production by electroreduction
  • Preparation method of boron carbide nanosheets/boron-doped graphene quantum dots and its application to ammonia production by electroreduction

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Embodiment 1

[0027] B 4 Preparation and Characterization of C-BGQDs

[0028] Boron carbide (B 4 C) Ultrasonic exfoliation into boron carbide nanosheets (B 4 C NSs), followed by high temperature treatment, in B 4 In situ boron-doped graphene is generated on the surface of CNSs, and then the boron-doped graphene generated in situ on the surface of boron carbide nanosheets is broken into boron-doped graphene quantum dots (BGQDs) by hydrothermal and ultrasonic treatment. Boron carbide nanosheets / boron-doped graphene quantum dots (B 4 C-BGQDs) composites. B 4 The preparation process of C-BGQDs is as follows figure 1 shown.

[0029] B 4 The specific steps of C-BGQDs composite materials are as follows:

[0030] (1) Add 1g of B 4 C was dispersed in 10 mL of ethanol, ultrasonicated for 1 h with an ultrasonic cell disruptor, and the resulting dispersion was centrifuged at 3000 rpm, and the supernatant was vacuum-dried at 60°C to prepare B 4 C NSs solid;

[0031] (2) The prepared B 4 C N...

Embodiment 2

[0036] B 4 NRR performance test of C-BGQDs

[0037] B 4 The NRR performance of C-BGQDs was investigated by chronoamperometry.

[0038] 5 mg of B 4 C-BGQDs and 40 μL of Nafion solution with a mass ratio of 5% were added to 1 mL of ethanol-water mixed solution with a volume ratio of 3:1, ultrasonicated for 30 min, and 20 μL of the mixed solution was added dropwise to a carbon paper electrode with an area of ​​1 cm×1 cm ( CPE) surface, dried naturally, made of boron carbide nanosheet / boron-doped graphene quantum dot modified carbon paper electrode (B 4 C-BGQDs / CPE). with B 4 C-BGQDs / CPE is the working electrode, the Ag / AgCl electrode is the reference electrode, and the graphite rod electrode is the counter electrode. The counter electrode is placed in the anode chamber of the H-type electrolytic cell containing 0.1M hydrochloric acid solution, and the cathode chamber and the anode chamber of the H-type electrolytic cell are separated by Nafion 211 membrane, and the electroc...

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Abstract

The invention discloses a preparation method of boron carbide nanosheets / boron-doped graphene quantum dots and its application in electroreduction to produce ammonia, and belongs to the technical field of electrochemical catalysis. Boron carbide is ultrasonically peeled into boron carbide nanosheets. After high-temperature treatment, boron-doped graphene is generated in situ on the surface of boron carbide nanosheets. The boron-doped graphene on the surface of boron carbide nanosheets is then broken into pieces through hydrothermal and ultrasonic treatment. into quantum dots to prepare boron carbide nanosheets / boron-doped graphene quantum dots (B 4 C-BGQDs) composite materials. B 4 The size of BGQDs on C-BGQDs is very small, which can expose more active sites, have better conductivity than boron carbide nanosheets, better adsorption of nitrogen, and better electrocatalytic nitrogen reduction activity. High-efficiency electrocatalytic nitrogen reduction to synthesize ammonia without the production of hydrazine hydrate as a by-product can be achieved at normal temperatures and pressures. In addition, B 4 C‑BGQDs also have excellent recyclability and electrochemical stability.

Description

technical field [0001] The invention discloses a preparation method of boron carbide nanosheets / boron-doped graphene quantum dots and its application in electroreduction ammonia production, belonging to the technical field of electrochemical catalysis. Background technique [0002] Ammonia is a vital chemical product widely used in agricultural fertilizers, pharmaceuticals, dyes and other fields. At the same time, because of its strong hydrogen content and high energy density, ammonia can be used as an alternative energy carrier and has attracted attention in order to promote the development of a low-carbon society. The growing demand for ammonia has motivated the search for artificial N 2 Fixed research interests. Currently, industrial-scale NH 3 Production mainly uses N 2 and H 2 As a feed gas, synthesized under high temperature and pressure by relying on the Haber-Bosch process, it accounts for about 2% of the global energy use. However, this process consumes a lot ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00B01J27/22C25B1/00C25B11/06
CPCC09K11/65B82Y20/00B82Y40/00B01J27/22C25B1/00C25B11/091B01J35/33
Inventor 邱建丁邱伟斌梁汝萍
Owner NANCHANG UNIV
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