Preparation method of heterojunction CoO/CoS porous nanorod, obtained material and application

A nanorod and heterojunction technology, applied in nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems of poor conductivity and low OER overpotential of transition metal oxides, and achieve improved Electrocatalytic oxidation performance, performance enhancement, and the effect of enriching mass transfer channels

Active Publication Date: 2021-07-02
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, single transition metal oxides are poorly conductive and difficult to achieve lower OER overpotentials

Method used

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  • Preparation method of heterojunction CoO/CoS porous nanorod, obtained material and application
  • Preparation method of heterojunction CoO/CoS porous nanorod, obtained material and application
  • Preparation method of heterojunction CoO/CoS porous nanorod, obtained material and application

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Embodiment 1

[0033] A method for preparing heterojunction CoO / CoS porous nanorods, comprising the following steps:

[0034] 1) Synthesis of Co-citrulline nanorod precursor: 2mmol L-citrulline and 1mmol Co(NO 3 ) 2 Dissolved in 35mL distilled water to form a pink clear solution, transferred to a 50mL autoclave, and reacted at 160°C for 5h. Subsequently, the water-alcohol mixed solution was centrifuged and washed several times, and after vacuum drying, a light pink powder was obtained, which was the Co-citrulline nanorod precursor;

[0035] 2) Preparation of heterojunction CoO / CoS porous nanorods: the light pink powder prepared in step 1) was oxidized and heat-treated at a rate of 0.5 °C / min to 350 °C in an air atmosphere, and kept at this temperature for 1 h. get black co 3 o 4 porous nanorods.

[0036] 3) the black Co obtained in step 2) 3 o 4 Porous nanorods and thiourea (mass is Co 3 o 4 10 times) placed at both ends of the porcelain boat 3cm apart, in N 2 Under the atmosphere,...

Embodiment 2

[0038] A method for preparing heterojunction CoO / CoS porous nanorods, comprising the following steps:

[0039]1) Synthesis of Co-citrulline nanorod precursor: 0.1mmol L-citrulline and 1mmol Co(NO 3 ) 2 Dissolved in 35mL distilled water to form a pink clear solution, transferred to a 50mL autoclave, and reacted at 160°C for 5h. Subsequently, the water-alcohol mixed solution was centrifuged and washed several times, and after vacuum drying, a light pink powder was obtained, which was the Co-citrulline nanorod precursor;

[0040] 2) Preparation of heterojunction CoO / CoS porous nanorods: the light pink powder prepared in step 1) was oxidized and heat-treated at a rate of 0.5 °C / min to 350 °C in an air atmosphere, and kept at this temperature for 1 h. get black co 3 o 4 porous nanorods.

[0041] 3) the black Co obtained in step 2) 3 o 4 Porous nanorods and thiourea (mass is Co 3 o 4 10 times) placed at both ends of the porcelain boat 3cm apart, in N 2 Under the atmosphere...

Embodiment 3

[0043] A method for preparing heterojunction CoO / CoS porous nanorods, comprising the following steps:

[0044] 1) Synthesis of Co-citrulline nanorod precursor: 10mmol L-citrulline and 1mmol Co(NO 3 ) 2 Dissolved in 35mL distilled water to form a pink clear solution, transferred to a 50mL autoclave, and reacted at 160°C for 5h. Subsequently, the water-alcohol mixed solution was centrifuged and washed several times, and after vacuum drying, a light pink powder was obtained, which was the Co-citrulline nanorod precursor;

[0045] 2) Preparation of heterojunction CoO / CoS porous nanorods: the light pink powder prepared in step 1) was oxidized and heat-treated at a rate of 0.5 °C / min to 350 °C in an air atmosphere, and kept at this temperature for 1 h. get black co 3 o 4 porous nanorods.

[0046] 3) the black Co obtained in step 2) 3 o 4 Porous nanorods and thiourea (mass is Co 3 o 4 15 times) placed at both ends of the porcelain boat 3cm apart, in N 2 Under the atmosphere...

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Abstract

The invention discloses a preparation method of a heterojunction CoO / CoS porous nanorod, an obtained material and application of the heterojunction CoO / CoS porous nanorod. The method comprises steps: synthesizing cobalt-citrulline nanorods by taking a cobalt salt as a metal source and L-citrulline as a coordination agent through hydrothermal reaction; calcining and oxidizing the nanorods; and finally, vulcanizing through a vapor deposition method to obtain the loose and porous heterojunction CoO / CoS porous nanorod with a rough surface. The heterojunction CoO / CoS porous nanorod catalyst prepared by the invention shows relatively high catalytic activity and stability on electrochemical reaction (OER) of oxygen, is a high-stability anode oxygen evolution catalyst which can be well applied to water electrolysis, and has a wide application prospect in the future energy industry.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to an anode catalyst and its preparation method and application. Background technique [0002] Energy crisis and environmental pollution are two major problems. The development of new technologies and new energy sources is the key to solving these two problems. Hydrogen energy is a kind of renewable energy with abundant reserves, clean and pollution-free. Hydrogen can be electrolyzed by water (2H 2 O→O 2 +H 2 )produce. However, due to the anodic oxygen evolution reaction OER (4OH→2H 2 O+4e - +O 2 ) multiple proton-pair electron transfer reactions, the mechanism of this process is complex, the kinetics are slow, and the overpotential required is high; therefore, the need to develop efficient electrocatalysts is particularly critical. Currently, commercial IrO 2 and RuO 2 It is an efficient OER catalyst, but its high price and rare content hinder its wide application. Therefore, it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04C01G51/00C25B1/04C25B11/091B82Y30/00B82Y40/00
CPCC01G51/04C01G51/30C25B1/04B82Y30/00B82Y40/00C01P2004/80C01P2002/72C01P2004/03C01P2004/04C01P2004/16Y02E60/36
Inventor 唐亚文王悦樊闯王琴张兴媛王旭孙冬梅
Owner NANJING NORMAL UNIVERSITY
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