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Ni/Ni3S2 nanocluster-graphene composite material as well as preparation method and application thereof

A composite material and graphene technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve problems such as hindering potential catalytic performance, low electrical conductivity, poor electrochemical stability, etc., to reduce Electron transfer barrier, enhanced conductivity, and optimized catalytic activity effects

Active Publication Date: 2020-12-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Despite the promising electrochemical performance, the low electrical conductivity and the limited number of exposed active sites inherently hinder the improvement of its potential catalytic performance
[0004] In addition, elemental nickel nanoparticles are also one of the widely studied electrocatalytic materials. However, due to their structural size and surface activity, the electrochemical stability is poor. However, the prepared elemental nickel composites are mostly used in HER catalysts, and rarely involved in OER systems

Method used

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  • Ni/Ni3S2 nanocluster-graphene composite material as well as preparation method and application thereof
  • Ni/Ni3S2 nanocluster-graphene composite material as well as preparation method and application thereof
  • Ni/Ni3S2 nanocluster-graphene composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The present embodiment 1 provides a kind of Ni / Ni supported by graphene 3 S 2 The preparation method of nano-cluster composite material, it comprises the steps:

[0053] (1) Inoculate the Pandoraea sp.B-6 cells stored on the LB slant in the LB liquid medium, and cultivate at 30°C for 18 hours to obtain the seed liquid of Pandoraea sp.B-6; wherein the LB liquid The distribution ratio of each component of the medium is: 10g of peptone, 5g of yeast powder, 10g of sodium chloride, and 1L of distilled water; the LB slope is based on the above formula by adding 15g / L of agar;

[0054] (2) The obtained Pandoraea sp.B-6 seed liquid was centrifuged for 5 minutes under the condition of 8000rpm, the supernatant was discarded, and the thalline was collected;

[0055] (3) Inoculate the collected Pandoraea sp.B-6 bacteria into 10% inoculum amount (the ratio of the volume of the transferred bacterial solution to the volume of the culture solution after inoculation), inoculate the st...

Embodiment 2

[0065] (1) Cultivate according to steps (1) and (2) in Example 1 to obtain the seed liquid of Pandoraea sp.B-6.

[0066] (2) The obtained Pandoraea sp.B-6 seed liquid was centrifuged for 5 minutes under the condition of 8000rpm, the supernatant was discarded, and the thalline was collected;

[0067] (3) Inoculate the collected Pandoraea sp.B-6 bacteria into 10% inoculum amount (the ratio of the volume of the transferred bacterial solution to the volume of the culture solution after inoculation), inoculate the sterile medium containing Cd, and inoculate at 30°C , natural pH, cultivated for 18h, and centrifuged at 8,000rpm for 5min to separate the bacterial cells; wherein the composition ratio of the Cd-containing sterile medium is: glucose 2g / L, Cd(NO 3 ) 2 , 0.3mM, NH 4 Cl1.5 g / L, MgCl 2 0.2g / L, CaCl 2 0.01g / L, FeSO 4 ·7H 2 O 0.015g / L, MnSO 4 ·H 2 O 0.01g / L; MOPs8.314g / L, trineg / L, L-cysteine ​​0.1mM.

[0068] (4) Disperse the CdS-bacteria precursor obtained in the ...

Embodiment 3

[0074] (1) Cultivate according to steps (1) and (2) in Example 1 to obtain the seed liquid of Pandoraea sp.B-6.

[0075] (2) The obtained Pandoraea sp.B-6 seed liquid was centrifuged for 5 minutes under the condition of 8000rpm, the supernatant was discarded, and the thalline was collected;

[0076] (3) Inoculate the collected Pandoraea sp.B-6 bacteria into 10% inoculum amount (the ratio of the volume of the transferred bacterial solution to the volume of the culture solution after inoculation), inoculate the sterile medium containing Cd, and inoculate at 30°C , natural pH, cultivated for 18h, and centrifuged at 8,000rpm for 5min to separate the bacterial cells; wherein the composition ratio of the Cd-containing sterile medium is: glucose 2g / L, Cd(NO 3 ) 2 , 0.4mM, NH 4 Cl1.5 g / L, MgCl 2 0.2g / L, CaCl 2 0.01g / L, FeSO 4 ·7H 2 O 0.015g / L, MnSO 4 ·H 2 O 0.01g / L; MOPs8.314g / L, trineg / L, L-cysteine ​​0.1mM.

[0077] (4) Disperse the CdS-bacteria precursor obtained in the ...

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Abstract

The invention discloses a Ni / Ni3S2 nanocluster-graphene composite material, a preparation method thereof and an application of the Ni / Ni3S2 nanocluster-graphene composite material in electrocatalyticoxygen evolution. CdS nanoparticles are accumulated on a cell membrane by changing components of a culture medium to regulate and control bacteria (Pandoraea sp. B-6 with the preservation number of CGMCC No.4239), the CdS nanoparticles are used as a carrier to sequentially load graphene oxide (GO) and Ni<2+> through electrostatic adsorption to form a composite precursor, then a catalyst is prepared through one-step pyrolysis, and the preparation method is simple, convenient, safe, cheap and easy to control. The material has excellent OER catalytic activity, low reaction energy barrier, more active sites and higher electrochemical active surface area, the electron transfer efficiency is improved due to the advantage of electrical conductivity, high catalytic performance and high stability can be kept in the long-time catalytic process. Precious metal can be replaced to promote the development of an electrolyzed water system in an alkaline medium.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, in particular to a Ni / Ni 3 S 2 Nanocluster-graphene composite material and its preparation method, and its application in electrocatalytic oxygen evolution. Background technique [0002] Growing global energy consumption requires a sustainable energy supply. Water splitting devices initiated by oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) are highly considered as ideal next-generation energy storage or conversion technologies. Compared with HER, the inherent complex four-electron transfer process of OER has been the biggest limitation to improve the overall water splitting efficiency. To accelerate this complex process, the development of efficient and stable OER electrocatalysts is urgently needed. So far, the most effective and stable OER catalysts in acidic or alkaline media are still based on noble metal oxides, such as IrO 2 and RuO 2 . However, t...

Claims

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Application Information

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IPC IPC(8): B01J27/043B01J35/10C25B11/06C25B1/04
CPCB01J27/043C25B11/04C25B1/04B01J35/33B01J35/61Y02E60/36
Inventor 石岩张可菁刘明人司梦莹柴立元杨志辉
Owner CENT SOUTH UNIV
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