A molybdenum diselenide/carbon nanotube array composite electrode, preparation method and application

A technology of carbon nanotube array and molybdenum diselenide, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve the problems of low specific capacity, high current charge and discharge performance (poor rate performance, etc.) The effect of increasing surface area, enriching active sites, and slowing release volume expansion

Active Publication Date: 2022-05-03
NORTHWEST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the defects and deficiencies of the prior art, a molybdenum diselenide / carbon nanotube array composite electrode, preparation method and application are proposed to solve the low specific capacity and large Problems such as poor current charge and discharge performance (rate performance)

Method used

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  • A molybdenum diselenide/carbon nanotube array composite electrode, preparation method and application
  • A molybdenum diselenide/carbon nanotube array composite electrode, preparation method and application
  • A molybdenum diselenide/carbon nanotube array composite electrode, preparation method and application

Examples

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preparation example Construction

[0036] The invention uses a simple spray chemical deposition method to prepare a carbon nanotube array, and then grows molybdenum diselenide on the carbon nanotube array by a hydrothermal method to obtain a composite electrode material on which molybdenum diselenide is deposited on the surface of the carbon nanotube. In the following embodiments of the present invention, vertically aligned carbon nanotube arrays are prepared. The preparation method of molybdenum diselenide / carbon nanotube array composite electrode of the present invention specifically comprises the following steps:

[0037] Step 1: Preparation of carbon nanotube arrays:

[0038] Place the cleaned silicon wafer in the constant temperature zone of the tube furnace, exhaust it with argon, and then heat it to 700-750°C at a rate of 25°C per minute. When the temperature rises to 700-750°C, the argon and hydrogen At the same time, it is passed into the tube furnace, wherein the volume ratio of hydrogen is 10% to 20...

Embodiment 1

[0048] Step 1: Preparation of carbon nanotube arrays:

[0049] Clean the silicon wafer with anhydrous ethanol ultrasonically for 15 minutes, then ultrasonically clean it with deionized water for 15 minutes, and dry it naturally in a clean environment to remove surface impurities;

[0050] Place the cleaned silicon wafer (1cm*1cm) in the middle of the quartz boat, and place the quartz boat in the constant temperature zone of the tube furnace; use the protective gas argon with a flow rate of 0.5SLM to exhaust for 20min, and set it at a rate of 0.5SLM per minute. Heating at a rate of 25°C to 750°C, during which time the argon flow was maintained at 0.5 SLM. When the temperature rises to 750°C, the flows of argon and hydrogen are controlled to be 0.8SLM and 100SCCM (8:1) respectively, and they are simultaneously passed into the tube furnace for 8 minutes.

[0051] Acetylene with a flow rate of 40 SCCM was introduced as a carbon source, and at the same time, the catalyst of a mixe...

Embodiment 2

[0062] The difference between this example and example 1 is that the preparation temperature in step 2 is 180°C.

[0063] The properties of the molybdenum diselenide / carbon tube array composite electrode prepared in this example and its preparation as a supercapacitor electrode are the same as in Example 1.

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Abstract

The invention discloses a molybdenum diselenide / carbon nanotube array composite electrode, a preparation method and an application. Sodium molybdate, selenium powder and sodium borohydride are mixed according to a molar ratio of 1:3:1 and dissolved in deionized water. and anhydrous ethanol, then put the carbon nanotube array into the mixed solution, and conduct a hydrothermal reaction at 180-220°C for 36-48 hours to obtain a molybdenum diselenide / carbon nanotube array composite electrode; disselenide The molybdenum / carbon tube array composite electrode film is pressed on the current collector by pressure to obtain the supercapacitor electrode. In the present invention, molybdenum diselenide and carbon nanotube arrays are combined as an electrode material, and its specific surface area is greatly increased, and it has more abundant active sites, and these advantages enable its high theoretical specific capacity to be fully utilized. No binder is added when preparing the composite electrode, which not only reduces the weight of the entire electrode, but also makes the active component and the current collector directly and tightly combined, greatly reducing the contact resistance of the electrode.

Description

technical field [0001] The invention belongs to the technical field of supercapacitor electrode structure design, and in particular relates to a molybdenum diselenide / carbon nanotube array composite electrode, a preparation method and an application. Background technique [0002] Finding new, high-efficiency energy storage devices has always been a topic of widespread concern. Excellent energy storage devices can not only alleviate energy shortages, but also solve environmental pollution caused by non-renewable resources such as coal, oil, and natural gas. Supercapacitors are one of the most promising energy storage devices because of their high power density, fast charge-discharge capability, long cycle life, and relatively low cost. The electrode material of a supercapacitor has a decisive influence on its performance. At present, there are two main methods to improve the electrochemical performance of capacitors: (1) select pseudocapacitive materials with high theoretica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/36H01G11/86
CPCH01G11/24H01G11/30H01G11/36H01G11/86Y02E60/13
Inventor 李渭龙任兆玉刘迎鸿陈欢畅新维
Owner NORTHWEST UNIV
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