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a cos x @mno 2 Composite material, preparation method and application thereof

A technology of composite materials and catalysts, applied in electrolytic components, electrodes, electrolytic processes, etc., can solve the problems of efficiency multi-step proton-coupled electron transfer obstacles, not widely used, overall efficiency obstacles, etc., to achieve excellent electrocatalytic performance and improve utilization rate, reducing the effect of aggregation

Active Publication Date: 2022-04-05
ANHUI UNIVERSITY
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Problems solved by technology

However, water splitting is a thermodynamically unfavorable process, and the overall efficiency of the process is somewhat hampered by the large potentials for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) on most electrocatalyst materials.
Currently, Pt and IrO 2 are the most effective electrocatalysts for HER and OER, respectively, however, due to the high cost and scarcity of Pt and Ir materials, they are not widely used in industrial-scale water separation, so the development of highly efficient and low-cost electrocatalysts based on earth-abundant elements to Comprehensive water splitting is highly desirable
[0004] Oxygen evolution reaction (OER) is the most critical half-reaction in water splitting process, however, the efficiency of oxygen evolution reaction (OER), as a key half-reaction in water splitting process, is limited by multi-step proton-coupled electron transfer and slow kinetic process hinder
Has been widely used in combustion batteries and rechargeable metal batteries, noble metal catalysts such as iridium oxide (IrO 2 ) and ruthenium oxide (RuO 2 ) is the most widely used OER catalyst commercially due to its superior electrocatalytic activity and stability, however, scarcity and high cost severely limit its further development, which is a trend to develop new high-performance, environment-friendly and inexpensive , the cost of materials is inevitable for OER catalysts. In recent years, people have been devoting themselves to the development of non-noble metal catalysts. Two-dimensional materials such as transition metal oxides, sulfides, and phosphides are promising in photo / electrocatalysis due to their unique interlayer structures. Splitting water has broad application prospects, including transition metal oxides, hydroxides, sulfides and phosphides, etc., due to their controllable structure, high theoretical activity, environmental friendliness and low cost, they are extremely promising. Potential candidate materials, among which manganese dioxide (MnO 2 ) is a typical transition metal oxide (TMOs), which exists widely in nature and is almost non-toxic. It has excellent electrical properties in OER catalytic activity

Method used

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  • a cos <sub>x</sub> @mno <sub>2</sub> Composite material, preparation method and application thereof
  • a cos <sub>x</sub> @mno <sub>2</sub> Composite material, preparation method and application thereof
  • a cos <sub>x</sub> @mno <sub>2</sub> Composite material, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A CoS X @MnO 2 The preparation method of catalyst, comprises the steps:

[0036] (1)MnO 2 Preparation of nanotubes: at room temperature, 0.3160g KMnO 4 Add to 30mL deionized water to disperse to form a uniform solution, and then make 10mL concentration 1moL·L -1 A solution of hydrochloric acid was added to the above KMnO 4 solution, stir and mix evenly, transfer the mixture to a hydrothermal reaction kettle, and react at 160°C for 5 hours, after the reaction is completed, centrifuge, wash with deionized water and absolute ethanol three times, and dry with electric blast at 60°C Oven drying for 8h to obtain the MnO 2 nanotube;

[0037] (2)ZIF-67@MnO 2 Preparation of composite material: first, the MnO prepared in step (1) 2 Add 0.0500 g of nanotubes into 25 mL of methanol for ultrasonic dispersion for 30 min, then stir magnetically for 30 min at room temperature, and then add 0.4000 g of Co(NO 3 ) 2 ·6H 2 O mix well, then quickly add 15 mL of CH containing 0.41...

Embodiment 2

[0040] A CoS X @MnO 2 The preparation method of catalyst, comprises the steps:

[0041] (1)MnO 2 Preparation of nanotubes: at room temperature, 0.5120g KMnO 4 Add to 50mL deionized water to disperse to form a uniform solution, and then make 12mL concentration to 1moL L -1 A solution of hydrochloric acid was added to the above KMnO 4 solution, stir and mix evenly, transfer the mixture to a hydrothermal reaction kettle, and react at 160°C for 5 hours, after the reaction is completed, centrifuge, wash with deionized water and absolute ethanol three times, and dry with electric blast at 60°C Oven drying for 8h to obtain the MnO 2 nanotube;

[0042] (2)ZIF-67@MnO 2 Preparation of composite material: first, the MnO prepared in step (1) 2 Add 0.0800 g of nanotubes into 30 mL of methanol for ultrasonic dispersion for 45 min, then stir magnetically for 30 min at room temperature, and then add 0.6000 g of Co(NO 3 ) 2 ·6H 2 O mix well, then quickly add 20 mL of CH containing 0...

Embodiment 3

[0045] A CoS X @MnO 2 The preparation method of catalyst, comprises the steps:

[0046] (1)MnO 2 Preparation of nanotubes: in parts by weight, at room temperature, 0.8310g KMnO 4 Add to 60mL deionized water to disperse to form a homogeneous solution, and then make 15mL concentration to 1moL L -1 A solution of hydrochloric acid was added to the above KMnO 4 solution, stir and mix evenly, transfer the mixture to a hydrothermal reaction kettle, and react at 160°C for 5 hours, after the reaction is completed, centrifuge, wash with deionized water and absolute ethanol three times, and dry with electric blast at 60°C Oven drying for 8h to obtain the MnO 2 nanotube;

[0047] (2)ZIF-67@MnO 2 Preparation of composite material: first, the MnO prepared in step (1) 2 Add 0.0900 g of nanotubes into 35 mL of methanol for ultrasonic dispersion for 30 min, then stir magnetically for 30 min at room temperature, and then add 0.8000 g of Co(NO 3 ) 2 ·6H 2 O mix well, then quickly add ...

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Abstract

The invention provides a CoSX@MnO 2 Composite material and its preparation method and application, its preparation method comprises: (1) MnO 2 Preparation of nanotubes; (2) ZIF‑67@MnO 2 Preparation of composite materials; (3) CoS X @MnO 2 Preparation of Catalyst; CoS of the Invention X @MnO 2 The preparation process of the catalyst is simple and controllable, the preparation time is short, and the structure of the obtained catalyst is dendritic MnO 2 penetrating fruit-like CoS X , its structure is stable; in addition, the CoS prepared by the present invention X @MnO 2 During the electrocatalytic oxygen evolution reaction of the catalyst, 10mAcm ‑2 The overpotential at the current density is only 334mV, compared to commercial MnO 2 Catalyst 470mV overpotential drops 136mV; In addition, CoS X @MnO 2 The Tafel slope is 84.8mV dec ‑1 , compared to the commercial MnO 2 Tafel slope 140mV dec ‑1 have a smaller Tafel slope. These all indicate that CoS X Loaded on carrier ZIF‑67@MnO 2 on after exhibited better than commercial MnO 2 more excellent electrocatalytic performance.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a CoSX@MnO 2 Composite materials and their preparation methods and applications. Background technique [0002] Due to the growing concern about the energy crisis and environmental pollution issues, there is an urgent need to find renewable energy alternatives to fossil fuels, and thus to explore efficient energy storage devices. Among various innovative options, hydrogen production by electrolysis of water as an ideal Clean energy is stimulating people's intense research interest. With the increase in energy demand and the awareness of environmental protection, the development of sustainable and clean resources has become one of the hottest issues in research today. Due to the wide range of energy-efficient raw materials and the Due to its environmentally benign properties, electrochemical water splitting (generating hydrogen and oxygen) has received extensive attention. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/091C25B1/04
CPCC25B1/04Y02E60/36
Inventor 毛昌杰石欣伟陈京帅陈永猛
Owner ANHUI UNIVERSITY
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