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Modified transition metal-based layered dihydroxy compound and preparation method and application thereof

A technology of bishydroxy compounds and transition metals, which is applied in the electrolysis process, electrolysis components, electrodes, etc., can solve the problems that the catalytic performance needs to be further improved, and achieve enhanced intrinsic catalytic activity, fast oxygen production rate, and low water splitting overpotential Effect

Active Publication Date: 2021-10-15
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with previous transition metal-based catalysts, TM LDH has better catalytic oxygen production activity and stability. In recent years, its application in the field of water splitting and hydrogen production has made great progress. Performance still needs to be further improved

Method used

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  • Modified transition metal-based layered dihydroxy compound and preparation method and application thereof
  • Modified transition metal-based layered dihydroxy compound and preparation method and application thereof
  • Modified transition metal-based layered dihydroxy compound and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] In this embodiment, a modified transition metal-based layered bishydroxyl compound is prepared, and the specific process includes the following steps:

[0045] S1, preparation of transition metal NiFe-based layered dihydroxy compound (NiFe LDH for short), specifically grow NiFe LDH nanosheets on nickel foam by hydrothermal method, as NiFe LDH nanosheet self-supporting electrodes, including:

[0046] A piece of nickel foam (2cm×4cm) was immersed in 1M HCl solution and ultrasonicated for 15min to remove oxides on its surface; then washed several times with deionized water and ethanol, and stored in clean ethanol for later use;

[0047] Add 1mL of 10mM nickel nitrate (Ni(NO 3 ) 2 ) aqueous solution and 1 mL of 5 mM ferric nitrate (Fe(NO 3 ) 3 ) aqueous solution, then add 77mL of deionized water; then under magnetic stirring, add 1mL of 100mM urea aqueous solution to the beaker to obtain a mixed solution; then transfer the mixed solution to a 100mL polytetrafluoroethylen...

Embodiment 2

[0055] In this example, a modified transition metal-based layered bishydroxyl compound is prepared. The difference between it and Example 1 is that in step S4, the UV irradiation polymerization time is adjusted from 24h to 18h, and other operations remain unchanged to obtain NiFe The LDH-ppy nanosheets are self-supporting electrodes, and the NiFe LDH-ppy nanosheets on them are modified transition metal-based bishydroxyl compounds.

Embodiment 3

[0057] In this example, a modified transition metal-based layered bishydroxyl compound was prepared. The difference between it and Example 1 is that in step S4, the UV irradiation polymerization time was adjusted from 24h to 12h, and other operations remained unchanged to obtain NiFe The LDH-ppy nanosheets are self-supporting electrodes, and the NiFe LDH-ppy nanosheets on them are modified transition metal-based bishydroxyl compounds.

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Abstract

The invention discloses a modified transition metal-based layered dihydroxy compound and a preparation method and application thereof. The modified transition metal-based layered dihydroxy compound comprises a transition metal-based layered dihydroxy compound and a conductive polymer inserted between layers of the transition metal-based layered dihydroxy compound; the transition metal-based layered dihydroxy compound contains at least one transition metal ion with a valence of more than three. According to the modified transition metal-based layered dihydroxy compound, the conductive polymer is inserted between the layers of the transition metal-based layered dihydroxy compound (TMLDH), so that the conductivity of the TM LDH can be improved, the intrinsic catalytic activity of the TM LDH is enhanced, and compared with the TM LDH without an insertion layer, the modified transition metal-based layered dihydroxy compound shows lower water decomposition overpotential and higher oxygen production rate.

Description

technical field [0001] The present invention relates to the technical field of electrocatalytic materials and new energy, in particular to a modified transition metal-based layered bishydroxyl compound and its preparation method and application, in particular to a modified transition metal-based layered bishydroxyl compound and its preparation method , and a water-splitting catalyst, a water-splitting electrode, and a water-splitting three-electrode system using the modified transition metal-based bishydroxy compound. Background technique [0002] The shortage of traditional energy and the increasingly severe environmental problems make the development and utilization of green energy that can replace fossil fuels become a hot issue of global concern. Hydrogen energy has attracted extensive attention and research due to its high energy density, clean combustion products and no pollution. At present, the methods for producing hydrogen mainly include hydrogen production by ste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04C25B11/095C25B11/065C25B11/061
CPCC25B1/04C25B11/095C25B11/065C25B11/061Y02E60/36
Inventor 杨世和龙霞鞠敏
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL