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A kind of nife-pbas-f catalyst with multi-level structure and its preparation method and application

A nife-pbas-f and catalyst technology, applied in the fields of clean energy and electrochemistry, can solve the problems of high overpotential of oxygen evolution reaction, unfavorable transport of electrocatalytic oxygen-producing substances, collapse of metal ion aggregation metal skeleton, etc., and achieve a large ratio Effect of surface area, excellent electrocatalytic oxygen evolution activity and stability, excellent performance

Active Publication Date: 2022-01-25
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cyanide bonds of PBAs are rapidly removed during the pyrolysis process, resulting in the aggregation of metal ions and the collapse of the metal skeleton of PBAs.
This leads to the failure of the derivatives of PBAs to take full advantage of the structural advantages of the initial PBAs, which is not conducive to the material transport during the electrocatalytic oxygen generation process, and ultimately leads to the generation of a higher overpotential for the oxygen evolution reaction.

Method used

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  • A kind of nife-pbas-f catalyst with multi-level structure and its preparation method and application
  • A kind of nife-pbas-f catalyst with multi-level structure and its preparation method and application
  • A kind of nife-pbas-f catalyst with multi-level structure and its preparation method and application

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preparation example Construction

[0029] In a first aspect, the present invention provides a method for preparing a NiFe-PBAs-F catalyst with a multi-level structure, comprising the steps of:

[0030] React foamed nickel in a mixed solution of nickel salt and hexamethylenetetramine to obtain Ni(OH) 2 Nanosheets;

[0031] Ni(OH) to be grown on a nickel foam substrate 2 The nanosheets were placed in a mixed solution of nickel salt, sodium citrate and potassium ferricyanide, reacted, and left to stand for a set time after the reaction to prepare NiFe-PBAs@Ni(OH) 2 multi-level structure;

[0032] The prepared NiFe-PBAs@Ni(OH) 2 Hierarchical structure and NH 4 F was heat-treated in an inert atmosphere to obtain a NiFe-PBAs-F catalyst with a hierarchical structure.

[0033]In some embodiments, the pretreatment method of the nickel foam is: sequentially washing with hydrochloric acid, acetone and ethanol.

[0034] Further, the pretreated nickel foam is placed in ethanol for later use.

[0035] In some embodime...

Embodiment 1

[0053] A NiFe-PBAs-F catalyst with excellent electrocatalytic oxygen evolution performance and its preparation method and application, comprising the following steps:

[0054] (1) Ultrasonic cleaning of nickel foam conductive substrate:

[0055] First cut with scissors to obtain a foamed nickel conductive substrate with a size of 2cm×4cm, then ultrasonically clean it with hydrochloric acid, acetone, and ethanol for 10 minutes, and finally store it in an ethanol solvent.

[0056] (2) Synthesis of Ni(OH) by hydrothermal method 2 Nanosheets:

[0057] 0.7 g of nickel nitrate hexahydrate and 0.7 g of hexamethylenetetramine were dissolved in 35 ml of deionized water, and stirred for 15 minutes to obtain a light green solution. Then the solution is transferred to a reaction kettle with 50 milliliters of polytetrafluoroethylene liners, and the clean foamed nickel obtained in (1) is placed in the still, and subjected to hydrothermal reaction at 100° C. for 10 hours, and naturally coo...

Embodiment 2

[0063] This embodiment prepares the NiFe-PBAs-F catalyst of different content fluorine amount, and preparation method is the same as embodiment 1, and difference is: the amount that fluorination adopts in the step (4) changes to: 0g, 80mg, 320mg, the prepared product The oxygen catalysts are labeled as NiFe-PBAs-Ar, NiFe-PBAs-F-80mg, NiFe-PBAs-F-320mg, respectively.

[0064] Ni(OH) 2 Nanosheets, NiFe-PBAs@Ni(OH) 2 Hierarchical structure, and morphology schematic diagram and phase analysis of NiFe-PBAs-F catalyst:

[0065] The Ni(OH) that embodiment 1 prepares 2 The XRD and SEM patterns of the nanosheets are as follows: figure 1 shown. from figure 1 It can be seen that Ni(OH) 2 The nanosheets grow uniformly on the nickel foam.

[0066] NiFe-PBAs@Ni(OH) prepared by embodiment 1 2 like figure 2 as shown, figure 2 (a) It can be seen that the substance generated after ion exchange is NiFe-PBAs@Ni(OH) 2 ,pass figure 2 (b-c) Low-magnification TEM shows that cubic NiFe-...

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Abstract

The invention discloses a NiFe-PBAs-F catalyst with a multi-level structure and its preparation method and application, comprising the following steps: reacting foamed nickel in a mixed solution of nickel salt and hexamethylenetetramine to obtain Ni( Oh) 2 Nanosheets; Ni(OH) to be grown on a nickel foam substrate 2 The nanosheets were put into the mixed solution of nickel salt, sodium citrate and potassium ferricyanide and reacted to prepare NiFe‑PBAs@Ni(OH) 2 Hierarchical structure; the prepared NiFe‑PBAs@Ni(OH) 2 Hierarchical structure and NH 4 F was mixed and heat-treated in an inert atmosphere to obtain a NiFe‑PBAs‑F catalyst with a hierarchical structure. The NiFe-PBAs-F catalyst with a multi-level structure in the present invention can maintain the framework structure of the original NiFe-PBAs, and can provide more convenient material transmission channels. In addition, the catalyst undergoes drastic remodeling during the OER process, generating more nickel oxyhydroxide and nickel hydroxide.

Description

technical field [0001] The invention belongs to the technical fields of clean energy and electrochemistry, and specifically relates to a NiFe-PBAs-F catalyst with a multi-level structure and its preparation method and application. The electrocatalyst can be applied to the oxygen evolution reaction of electrocatalyzed water splitting. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] At present, the energy crisis and environmental pollution problems are becoming more and more prominent. The development and search for new clean energy technologies to provide the chemicals needed by human beings has become the focus of all human beings. As a kind of clean energy, electric ener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/095C25B1/04
CPCC25B1/04Y02E60/36
Inventor 郑昭科马法豪黄柏标王泽岩程合锋王朋刘媛媛张晓阳张倩倩
Owner SHANDONG UNIV
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