Preparation method and application of P-doped FeS/Co3S4/Co9S8 composite material

A composite material, co3s4 technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of low working voltage and low capacity of asymmetric supercapacitors

Active Publication Date: 2021-09-10
CHINA THREE GORGES UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of low operating voltage of traditional symmetric supercapacitors and low capacity of traditional asymmetric supercapacitors, and propose a P-doped FeS / Co with larger capacity in both positive and negative potential intervals. 3 S 4 / Co 9 S 8 Composite materials, and using them as electrode materials to construct high-voltage symmetric aqueous supercapacitors

Method used

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  • Preparation method and application of P-doped FeS/Co3S4/Co9S8 composite material
  • Preparation method and application of P-doped FeS/Co3S4/Co9S8 composite material
  • Preparation method and application of P-doped FeS/Co3S4/Co9S8 composite material

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Embodiment 1

[0034] Step 1: Weigh 0.7mmol ferric nitrate and 0.7mmol cobalt nitrate and dissolve them in 35mL deionized water, stir for 10min to obtain a transparent solution, add 3.5mmol urea and 0.028mol ammonium fluoride under magnetic stirring to make it dissolve in transparent solution, put the resulting solution into a 50mL polytetrafluoroethylene liner, put a piece of 2cm×3cm foam nickel, then put the liner into a stainless steel hydrothermal kettle and seal it well, and put it in a constant temperature drying oven at 120°C. Keep warm for 8h, and cool down to room temperature naturally after the reaction is completed.

[0035] Step 2: Take out the sample, ultrasonically clean it once in deionized water and absolute ethanol, each time for 10 minutes, and dry it under natural conditions after cleaning.

[0036] Step 3: Weigh 0.0175mol sodium sulfide and dissolve it in 35mL deionized water. After fully dissolving, put it into the PTFE lining, put the sample obtained in the second step,...

Embodiment 2

[0041] Compared with embodiment 1, embodiment 2 uses 0.0014mol ammonium fluoride, and all the other are the same as embodiment 1. attached Figure 8 It is the graph of the electrochemical performance of the sample. In the potential range of -1 to 0V, the capacity is 202.72F / g, and the capacity retention rate after 3000 cycles is only 43.76%.

Embodiment 3

[0043] Compared with embodiment 1, embodiment 3 uses 0.014mol ammonium fluoride, and all the other are the same as embodiment 1. attached Figure 10 It is the graph of the electrochemical performance of the sample. In the potential range of -1 to 0V, the capacity is 287.67F / g, and the capacity retention rate after 3000 cycles is only 17.02%.

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Abstract

The invention discloses a preparation method of a P-doped FeS / Co3S4 / Co9S8 nano composite material and an application of the P-doped FeS / Co3S4 / Co9S8 nano composite material in a high-voltage water system symmetric supercapacitor. Foamed nickel is used as a substrate, ferric salt and cobalt salt are used as metal sources, ammonium fluoride and urea are used as precipitants, sodium sulfide is used as a vulcanizing agent, and sodium hypophosphite is used as an inorganic phosphorus source. The preparation method comprises the following steps: firstly, obtaining a FeS / Co3S4 / Co9S8 three-phase nano composite material which uniformly grows on a foamed nickel substrate; and then obtaining the P-doped FeS / Co3S4 / Co9S8 nano composite material with the tremella structure by using a chemical vapor deposition method. The prepared P-doped FeS / Co3S4 / Co9S8 nano composite material is assembled into a three-electrode system, electrochemical performance evaluation is carried out in a 1M KOH electrolyte, the maximum capacity reaches 531 F / g (10A / g) in the potential interval of-1-0V, and the capacity retention rate is 71.36% after 20 thousand cycles; and in the potential interval of 0-0.55 V, the initial capacity is 1028.78 F / g (10A / g), and the capacity is increased to 2492.73 F / g after 20000 cycles, namely the capacity retention ratio is 242.3%.

Description

technical field [0001] The invention belongs to the field of water-based supercapacitors, in particular to a P-doped FeS / Co with tremella structure 3 S 4 / Co 9 S 8 Preparation methods of nanocomposites and their applications in high voltage aqueous symmetric supercapacitors. Background technique [0002] Efficient and low-cost energy conversion and storage systems are an important component of environmentally friendly and renewable energy. Among various energy storage devices, supercapacitors are ideal candidates due to their advantages such as low manufacturing cost, fast charging and discharging, and long cycle life. However, the energy density of supercapacitors is lower than that of lithium-ion batteries, which limits their wide commercial application. [0003] By E=0.5CV 2 (E is the energy density, C is the specific capacity, and V is the operating voltage). It can be seen that the key to constructing a high energy density supercapacitor is to obtain high specific...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/30H01G11/24H01G11/26H01G11/86
CPCH01G11/30H01G11/24H01G11/26H01G11/86Y02E60/13
Inventor 肖婷姚玉帅谭新玉向鹏姜礼华
Owner CHINA THREE GORGES UNIV
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