Preparation method and application of iron nickel phosphide nanosheet forming capacitor material

A technology of nanosheets and iron phosphide, which is applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, phosphides, etc., can solve the problems of poor rate performance and cycle performance, and limited specific capacitance value, and achieve electrochemical performance Excellent, not easy to fall off, and the effect of high-efficiency electronic paths

Pending Publication Date: 2022-07-29
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, studies on iron-based phosphides have shown that they exhibit high specific capacity but poor rate capability and cycle performance due to volume deformation during testing
On the contrary, nickel phosphide has good rate performance and excellent stability, but the specific capacitance value is limited compared with other transition metal oxides.

Method used

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  • Preparation method and application of iron nickel phosphide nanosheet forming capacitor material
  • Preparation method and application of iron nickel phosphide nanosheet forming capacitor material
  • Preparation method and application of iron nickel phosphide nanosheet forming capacitor material

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Experimental program
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Embodiment 1

[0031] In this embodiment, the preparation method of the iron-nickel phosphide nanosheets constituting the capacitor material is as follows:

[0032] Step (1) Cut out 3.8×5.2cm 2 The nickel foam was ultrasonically cleaned with dilute hydrochloric acid, alcohol, and deionized water for 15 minutes.

[0033] Step (2) respectively adding ferric chloride and sodium chloride in a molar ratio of 1:1 to 60 mL of deionized water, and magnetically stirring for 30 minutes to dissolve.

[0034] Step (3) Transfer the nickel foam cleaned in step (1) and the mixed solution prepared in step (2) to a 100 mL hydrothermal reactor, and react at 120° C. for 10 hours.

[0035] Step (4) After the reaction is completed, after cooling to room temperature, the nickel foam loaded with the iron-nickel double metal hydroxide is taken out, and washed with deionized water by shaking. Dry at 80°C for 10h.

[0036] Step (5) The dried nickel foam loaded with iron-nickel double metal hydroxide is placed in a...

Embodiment 2

[0039] In this embodiment, the application of the iron-nickel phosphide nanosheets constituting the capacitor material is as follows:

[0040] In step (1), choose molar concentration to be 3mol L -1 The potassium hydroxide aqueous solution was used as the electrolyte, the platinum electrode was used as the counter electrode, and the Ag / AgCl was used as the reference electrode to test the cyclic voltammetry curve of the iron-nickel double metal hydroxide supercapacitor electrode material.

[0041] In step (2), choose molar concentration to be 3mol L -1 The potassium hydroxide aqueous solution was used as the electrolyte, the platinum electrode was used as the counter electrode, and the Ag / AgCl was used as the reference electrode.

[0042] In step (3), the voltage range of the cyclic voltammetry curve test in steps (1) and (2) is 0-0.45V, and the scanning speed range is 1-100mVs -1 ; The voltage range of the charge-discharge test described in step (2) is 0~0.4V, and the curren...

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Abstract

The invention belongs to the field of supercapacitors, and particularly relates to a preparation method and application of an iron nickel phosphide nanosheet forming a capacitor material. According to the technical scheme, a conductive support material is adopted as an electrode current collector and a support, an iron-nickel double-metal hydroxide nanosheet precursor grows on the surface of the conductive support material in situ by adopting a solvothermal method, and then the supercapacitor electrode material with the honeycomb-shaped iron-nickel phosphide nanosheet array structure is formed through heat treatment and phosphorization. The method is simple to operate, low in cost, environment-friendly and green, and the size and morphology of the material are easy to regulate and control. The iron nickel phosphide nanosheet disclosed by the invention is an excellent supercapacitor electrode material, and has high specific capacity and excellent long-acting circulation capability.

Description

technical field [0001] The invention belongs to the field of supercapacitors, and in particular relates to a preparation method and application of iron phosphide-nickel nanosheets constituting capacitor materials. Background technique [0002] Compared with traditional electric energy storage system batteries, supercapacitors, as a green energy storage element, have the advantages of high power density, fast charging speed and long cycle life, and have broad development prospects in the field of energy storage. Supercapacitors can be divided into electric double layer supercapacitors and pseudocapacitive supercapacitors according to their energy storage characteristics. Due to the abundant active sites on the surface of transition metal phosphides, which can undergo rapid and reversible redox reactions, they exhibit strong pseudocapacitive properties. Therefore, the theoretical specific capacitance of transition metal phosphide is much higher than that of the electric doubl...

Claims

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Application Information

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IPC IPC(8): C01B25/08H01G11/30H01G11/86
CPCC01B25/088H01G11/86H01G11/30C01P2002/72C01P2004/03C01P2004/04C01P2006/40
Inventor 李睿智李晨靓
Owner WUHAN UNIV OF SCI & TECH
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