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Bifunctional water electrolysis catalyst and preparation method and application thereof

A water electrolysis and dual-function technology, applied in chemical instruments and methods, physical/chemical process catalysts, electrolytic components, etc., can solve the problems of limited reports and achieve the effect of rich morphology, simple and convenient operation, and excellent performance

Active Publication Date: 2020-06-12
JIANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current reports on the preparation of one-dimensional nanostructures by liquid phase self-assembly methods mainly focus on metal oxides, while the reports on the preparation of one-dimensional transition metal sulfide nanostructures by self-assembly methods are still very limited.

Method used

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  • Bifunctional water electrolysis catalyst and preparation method and application thereof
  • Bifunctional water electrolysis catalyst and preparation method and application thereof
  • Bifunctional water electrolysis catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] NeS 2 The growth of the nanotube material was accomplished as follows: 0.2 mmol nickel chloride (NiCl 2 ·6H 2 O), 0.5 mmol sodium thiosulfate (Na 2 S 2 o 3 ·6H 2 O) and 0.11g of polyvinylpyrrolidone were dissolved in 60mL of deionized water to obtain an aqueous reaction solution; the aqueous reaction solution was transferred to a 100mL polytetrafluoroethylene autoclave, and the treated foamed nickel (size 1 × 3cm) was put into the reaction in the cauldron. Keep the reactor at 150°C for 10h, after cooling to room temperature, wash the nickel foam thoroughly with deionized water and ethanol, and then dry it at 70°C for 10h to obtain a bifunctional electrolytic water catalyst.

Embodiment 2

[0029] NeS 2 The growth of the nanotube material was accomplished as follows: 0.2 mmol nickel chloride (NiCl 2 ·6H 2 O), 0.5 mmol sodium thiosulfate (Na 2 S 2 o 3 ·6H 2 O) and 0.11g of polyvinylpyrrolidone were dissolved in 70mL of deionized water to obtain a reaction aqueous solution; the reaction solution was transferred to a 100mL polytetrafluoroethylene autoclave, and the treated foamed nickel (size 1 × 3cm) was put into the reaction in the cauldron. Keep the reactor at 155°C for 10h, after cooling to room temperature, wash the nickel foam thoroughly with deionized water and ethanol, and then dry it at 70°C for 10h to obtain a bifunctional electrolytic water catalyst.

Embodiment 3

[0031] NeS 2 The growth of the nanotube material was accomplished as follows: 0.2 mmol nickel chloride (NiCl 2 ·6H 2 O), 0.5 mmol sodium thiosulfate (Na 2 S 2 o 3 ·6H 2 O) and 0.11g of polyvinylpyrrolidone were dissolved in 76mL of deionized water to obtain an aqueous reaction solution; the aqueous reaction solution was transferred to a 100mL polytetrafluoroethylene autoclave, and the treated foamed nickel (size 1 × 3cm) was put into the reaction in the cauldron. Keep the reactor at 150°C for 10h, after cooling to room temperature, wash the nickel foam thoroughly with deionized water and ethanol, and then dry it at 70°C for 10h to obtain a bifunctional electrolytic water catalyst.

[0032] In the prepared bifunctional electrolytic water catalyst, NiS 2 The nanotubes grow approximately vertically on the nickel foam substrate in the form of arrays, with a diameter of 20-80nm and a length of 100-500nm.

[0033]The process of using the bifunctional electrolytic water catal...

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Abstract

The invention discloses a bifunctional water electrolysis catalyst and a preparation method and application thereof. In the bifunctional water electrolysis catalyst, NiS2 nanotubes approximately vertically grow on a substrate in an array form, the diameter of the NiS2 nanotubes is 20-80nm, and the length of the NiS2 nanotubes is 100-500nm. The formation of the nanotubes has undergone a nanosheet crimping process. The nanotube array grows on the foamed nickel substrate in situ, the NiS2 material shows excellent electro-catalytic performance on hydrogen production half reaction (HER) and oxygenevolution half reaction (OER) of water decomposition due to the special structure of the one-dimensional nanotubes, and the electro-catalytic performance is higher than that of other NiS2 materials inthe prior art. Particularly, when the bifunctional water electrolysis catalyst is used as a cathode and an anode of a two-electrode system at the same time to carry out a full-water-splitting reaction, the current of 10mA / cm < 2 > can be obtained by only needing the voltage of 1.58 V.

Description

technical field [0001] The present invention relates to catalysts, in particular to nickel sulfide (NiS 2 ) nanotube material and its preparation method and application. Background technique [0002] Electrochemical water splitting to produce hydrogen and oxygen is a research hotspot in recent years. In practical applications, in order to accelerate the hydrogen production half reaction (HER) and oxygen evolution half reaction (OER), efficient electrocatalysts need to be developed. Although Pt and Ru / Ir-based materials have been proven to be highly efficient electrocatalysts for HER and OER, respectively, their low reserves and high price limit their large-scale use. In the past five years, various cheap and abundant materials have been developed as electrocatalysts for HER and OER, including transition metal oxides, sulfides, selenides, phosphides, nitrides, and carbides, etc. Among these materials, transition metal sulfides NiS 2 Due to its excellent electrocatalytic p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/043B01J35/00C25B1/04C25B11/06
CPCB01J27/043C25B1/04C25B11/051C25B11/075B01J35/33Y02E60/36
Inventor 杨勇刘艳婷梁艳罗婷袁彩雷
Owner JIANGXI NORMAL UNIV
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