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NiFe-PBAs-F catalyst with multistage structure as well as preparation method and application thereof

A nife-pbas-f, catalyst technology, applied in the field of clean energy and electrochemistry, can solve the problems of metal ion aggregation, metal skeleton collapse, high overpotential for oxygen evolution reaction, and unfavorable electrocatalytic oxygen-producing species transport.

Active Publication Date: 2021-04-09
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • NiFe-PBAs-F catalyst with multistage structure as well as preparation method and application thereof
  • NiFe-PBAs-F catalyst with multistage structure as well as preparation method and application thereof
  • NiFe-PBAs-F catalyst with multistage structure as well as preparation method and application thereof

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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 Such as 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 Ni...

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Abstract

The invention discloses a NiFe-PBAs-F catalyst with a multistage structure as well as a preparation method and application thereof. The preparation method comprises the following steps: enabling foamed nickel to react in a mixed solution of nickel salt and hexamethylene tetramine to obtain Ni(OH)2 nano sheets; putting Ni(OH)2 nano sheets growing on a foamed nickel substrate into a mixed solution of nickel salt, sodium citrate and potassium ferricyanide, and reacting to prepare a NiFe-PBAs@Ni(OH)2 multistage structure; and mixing the prepared NiFe-PBAs@Ni(OH)2 multistage structure with NH4F in an inert atmosphere, and carrying out heat treatment to obtain the NiFe-PBAs-F catalyst with a multistage structure. According to the NiFe-PBAs-F catalyst with a multistage structure, the original frame structure of NiFe-PBAs-F can be maintained, and a more convenient substance transmission channel can be provided. In addition, the catalyst achieves violent reconstruction in the OER process, and more nickel oxyhydroxide and nickel hydroxide are generated.

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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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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