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Nanometer porous NiFeMn alloy/oxide composite electrode and preparation method thereof

A technology of nanoporous nickel and iron-manganese alloys, which is applied in the field of preparing the above-mentioned electrodes and nanoporous nickel-iron-manganese alloy/oxide composite electrodes, and can solve the problems of poor conductivity, poor interfacial bonding force, and poor conductivity of transition metal oxides or hydroxides. Solve the problems of low capacity retention rate and achieve the effect of abundant raw materials, good electrical conductivity and easy availability of raw materials

Inactive Publication Date: 2018-03-30
TIANJIN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the poor conductivity of transition metal oxides or hydroxides leads to poor stability and low capacity retention in practical applications.
[0003] The use of conductive enhancers, such as carbon nanomaterials, nanoporous metals, and atomic doping can effectively improve the electron transport efficiency of materials and thus improve the electrochemical performance of electrode materials, but there are still defects of poor interface binding force

Method used

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  • Nanometer porous NiFeMn alloy/oxide composite electrode and preparation method thereof
  • Nanometer porous NiFeMn alloy/oxide composite electrode and preparation method thereof
  • Nanometer porous NiFeMn alloy/oxide composite electrode and preparation method thereof

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preparation example Construction

[0018] See figure 1 , the preparation method of the nanoporous nickel-iron-manganese alloy / oxide composite electrode that the present invention relates to, comprises the following steps:

[0019] (1) Preparation of the alloy: NiFeMn alloy is prepared, and its alloy composition ratio can be determined according to the ternary phase diagram to obtain a single-phase or few-phase solid solution. The preparation process includes strip spinning to prepare alloy strips and smelting and rolling to prepare alloy plates of different thicknesses. In order to ensure a continuous self-supporting electrode after subsequent dealloying and polarization processes, the content of manganese atoms in the alloy should be guaranteed to be 60% to 80%, the content of nickel atoms can be guaranteed to be between 5% and 25%, and the balance is Iron atoms (the ratios are all atomic content ratios).

[0020] (2) Preparation of nanoporous alloy; on the basis of step (1), selectively corrode part of the ...

Embodiment 1

[0028] The Ni10Fe20Mn70 alloy with the alloy ratio was selected as the master alloy for three-electrode electrochemical dealloying in 1mol / L ammonium sulfate solution, the dealloying voltage was -0.65V, and the dealloying time was 1h. Potassium hydroxide of 1mol / L was used as the polarized electrolyte and the test electrolyte. After polarization, the test analysis found that: when the test voltage window was 1.3V, when the current density was 1A / cm 3 , the specific capacitance is 685F / cm 3 . The current density is 0.5-10A / cm 3 , the energy density can be maintained at 9.9-34mWh / cm 3 .

Embodiment 2

[0030] The Ni15Fe15Mn70 alloy with the alloy ratio was selected as the master alloy for three-electrode electrochemical dealloying in 1mol / L ammonium sulfate solution, the dealloying voltage was -0.65V, and the dealloying time was 1h. Potassium hydroxide of 1mol / L was used as the polarized electrolyte and the test electrolyte. After polarization, the test analysis found that: when the current density is 1A / cm 3 , the specific capacitance is 901F / cm 3 . The current density is 0.5-10A / cm 3 , the energy density can be maintained at 20-48mWh / cm 3 (voltage window 1.3V).

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Abstract

The invention discloses a nanometer porous NiFeMn alloy / oxide composite electrode and a preparation method thereof. An alloy strip with flexibility is successfully fabricated by controlling differentNiFeMn constituent proportions, a nanometer porous alloy precursor can be fabricated by a dealloying method, and a layer of mixed-valence doping thin-layer oxide is automatically grown on a surface ofthe electrode and holes by further polarization processing. Iron is low in cost, a ternary NiFeMn composite electrode is fabricated by substituting copper with iron, and the raw material is rich andavailable; and actual supercapacitor application test founds out that compared with a binary NiMn system, the ternary NiFeMn composite electrode has the advantages that the specific capacitance can reach (400-1,500) F / cm<3>, the working voltage window can reach 1.2-1.5V, and the energy density (15-80 mWh / cm<3>) of the electrode is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of research and development and application of electrochemical capacitor electrodes, and in particular relates to a nanoporous nickel-iron-manganese alloy / oxide composite electrode, and also relates to a method for preparing the electrode. Background technique [0002] Due to the advantages of high energy density and fast charge and discharge speed, the use of transition metal oxides as electrode materials for supercapacitors has attracted great attention in the fields of research and industrial applications. However, the poor conductivity of transition metal oxides or hydroxides leads to the disadvantages of poor stability and low capacity retention in practical applications. [0003] The use of conductive enhancers, such as carbon nanomaterials, nanoporous metals, and atomic doping can effectively improve the electron transport efficiency of materials and thus improve the electrochemical performance of ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/46H01G11/86B82Y30/00B82Y40/00
CPCY02E60/13H01G11/24B82Y30/00B82Y40/00H01G11/30H01G11/46H01G11/86
Inventor 康建立张少飞张志佳于镇洋乔志军黄钦
Owner TIANJIN POLYTECHNIC UNIV
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