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Nitrogen-doped carbon nano-array/ cobalt ferrite material

A nano-array, nitrogen-doped carbon technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of poor electrical conductivity of ferrite, and achieve the effects of low cost, high catalytic efficiency, and poor electrical conductivity.

Inactive Publication Date: 2018-06-19
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the current problem of poor electrical conductivity of ferrite, the present invention provides a nanomaterial based on iron-cobalt polyaniline array, which has higher catalytic efficiency and better electrical conductivity

Method used

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  • Nitrogen-doped carbon nano-array/ cobalt ferrite material
  • Nitrogen-doped carbon nano-array/ cobalt ferrite material
  • Nitrogen-doped carbon nano-array/ cobalt ferrite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1 Preparation of nitrogen-doped carbon nanoarray / cobalt ferrite material.

[0033] 1.1 Preparation of carbon paper

[0034] Take an appropriate amount of water and put it into a large beaker, put the prepared carbon paper into a 50mL beaker, take 20mL of ultrapure water into the beaker, and then take 1.345mL of HNO with a mass fraction of 68%. 3 Slowly add to the beaker. Put the small beaker into the beaker, put it on a magnetic stirrer for heating in a water bath, boil the carbon paper with acid at 90°C for 1 hour; take out the boiled carbon paper, mark it on the carbon paper, and take a 50mL small beaker Clean it up, and add an appropriate amount of ultrapure water to it, add the marked carbon paper to it, perform ultrasonic cleaning for 5-10 minutes, then replace the ultrapure water with ethanol and ultrasonically clean for 5 minutes; then put it in an oven for drying .

[0035] 1.2 Preparation of polyaniline nanoarrays (N-CNAs)

[0036] Take 50mL of ultr...

Embodiment 2

[0041] Example 2 Nitrogen-doped carbon nanoarray / cobalt ferrite material (N-C@CoFe 2 o 4 ) physicochemical properties.

[0042] In embodiment 1, polyaniline nanoarray and figure 1 , a) SEM images of polyaniline nanoarrays (N-CNAs) during synthesis, b) nitrogen-doped carbon nanoarrays / cobalt ferrite (N-C@CoFe 2 o 4 ) of the scanning electron microscope, it can be seen that N-CNAs and N-C@CoFe were successfully prepared 2 o 4 .

Embodiment 3

[0043] Example 3 Nitrogen-doped carbon nanoarray / cobalt ferrite material (N-C@CoFe 2 o 4 ) catalytic activity.

[0044] 3.1 Linear sweep voltammetry

[0045] Detection of (0V~0.8V vs. Ag / AgCl) N-CNAs and N-C@CoFe in 1M KOH Electrolyte Solution 2 o 4 The corresponding linear sweep voltammetry curve is as figure 2 Shown: N-C@CoFe 2 o 4 The initial overpotential of N-CNAs is 1.42V, and that of N-CNAs is 1.57V. N-C@CoFe 2 o4 The initial overpotential is relatively low, and the potential required for oxygen evolution reaction is relatively low. It can be seen that N-C@CoFe 2 o 4 The OER catalytic activity of N-CNAs is stronger than that of N-CNAs.

[0046] 3.2 Electrochemical surface active area

[0047] N-C@CoFe 2 o 4 The cyclic voltammetry curve (0V~0.8V vs.Ag / AgCl) tested in 1M KOH electrolyte solution is as follows image 3 As shown, N-C@CoFe was detected in 1M KOH electrolyte solution (-0.05V ~ 0.05V vs. Ag / AgCl, scan rate was 20, 40, 60, 80, 100mV / s) 2 o 4 T...

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Abstract

The invention provides a nitrogen-doped carbon nano-array / cobalt ferrite material obtained by calcining a polyaniline-iron-cobalt metal organic framework, the nano material is a double-metal oxide, and has a large specific surface area, a plurality of catalytic sites, and higher catalytic efficiency. The polyaniline-iron-cobalt metal organic framework has good compatibility with various metal ions, a uniform multi-metal spinel can be easily synthesized from the polyaniline-iron-cobalt metal organic framework, the double-metal oxide and a conductive polymer are combined, so that advantages of different types of electrode materials can be combined with each other, and at the same time, nitrogen-doped carbon can be formed by polyaniline calcination, conductivity is further improved, and the defects of poor conductivity and poor stability of iron-cobalt oxides can be solved.

Description

technical field [0001] The invention belongs to the field of electrode material preparation and relates to a nitrogen-doped carbon nano-array material loaded with cobalt ferrite. Background technique [0002] The electrocatalytic conversion between oxygen and water is a critical step in new energy technologies such as metal-air batteries, fuel cells, and water splitting. Currently, platinum and platinum composites are considered to be the best catalysts for the oxygen reduction reaction (ORR), while ruthenium and iridium oxides are the best catalysts for the oxygen evolution reaction (OER). However, these materials are costly and have poor durability, making them difficult to be widely used. Therefore, current research focuses on transition metal oxides as catalysts for OER. Ferrite MFe 2 o 4 (M = Co, Ni, Cu, etc.) have many advantages, such as: low cost, high abundance, low toxicity, etc., but poor conductivity in the electrochemical process limits its catalytic activit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/62
CPCH01M4/364H01M4/525H01M4/625Y02E60/10
Inventor 赵振路周欣俞蒋彤王建荣杨萍
Owner UNIV OF JINAN
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