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A kind of iron-based nano-array electrocatalytic electrode, its preparation method and alkaline fuel cell

A nano-array and electrocatalytic technology, applied in the direction of fuel cells, battery electrodes, nanotechnology, etc., can solve the problems of electrochemical performance attenuation, and achieve the effects of reducing production costs, improving oxygen reduction catalytic activity, and low price

Inactive Publication Date: 2019-04-30
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with traditional commercial carbon-supported platinum catalysts for oxygen reduction, its electrochemical performance decays by more than 50% during long-term use (24000s)

Method used

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  • A kind of iron-based nano-array electrocatalytic electrode, its preparation method and alkaline fuel cell
  • A kind of iron-based nano-array electrocatalytic electrode, its preparation method and alkaline fuel cell
  • A kind of iron-based nano-array electrocatalytic electrode, its preparation method and alkaline fuel cell

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Experimental program
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Effect test

Embodiment 1

[0053] A method for preparing an iron-based nano-array structure electrocatalytic electrode, comprising the steps of:

[0054] (1) Polish the surface (10mm×20mm) of the 0.2mm pure iron sheet (99.99%) with 1000, 1500 and 2000 mesh sandpaper in turn, and polish with 0.3 and 0.05μm alumina polishing powder to make the surface of the electrode substrate basically flat, and then Ultrasonic in ethanol and distilled water for 10min (ultrasonic power is 200W), take out and dry as the anode for anodic oxidation, the counter electrode is a copper sheet, and the electrolyte contains 0.2wt% NH 4 F, the ethylene glycol solution of 5.0vol% perchloric acid, the oxidation voltage is 60V, the oxidation temperature is 20°C, and the oxidation time is 10min to obtain the electrode matrix;

[0055] (2) The electrode matrix is ​​used as the anode, and the pure copper sheet is used as the counter electrode, and the anodic oxidation is carried out, and the electrolyte used for the anodic oxidation is...

Embodiment 2

[0060] A method for preparing an iron-based nano-array structure electrocatalytic electrode, comprising the steps of:

[0061] (1) Polish the surface (10mm×20mm) of a 0.5mm pure iron sheet (99.99%) with 1000, 1500 and 2000 mesh sandpaper in sequence, and then further polish to make the surface of the substrate basically flat, and then ultrasonically in ethanol and distilled water for 10min (Ultrasonic power is 180W), take out and dry and carry out anodic oxidation treatment as anode, with pure copper sheet as counter electrode, anodic oxidation treatment adopts to contain 0.3wt%NH 4 F. The ethylene glycol solution of 5.0vol% perchloric acid is used as the electrolyte, the oxidation voltage is 50V, the oxidation is carried out at 30°C, and the oxidation time is 20min to obtain the electrode matrix;

[0062] (2) The electrode substrate is used as the anode, and the counter electrode is a pure copper sheet, which is subjected to electrochemical anodic oxidation treatment, using 0...

Embodiment 3

[0065] A method for preparing an iron-based nano-array structure electrocatalytic electrode, comprising the steps of:

[0066] (1) Polish the surface (10mm×20mm) of a 0.5mm pure iron sheet (99.99%) with 1000, 1500 and 2000 mesh sandpaper in sequence, and then further polish to make the surface of the substrate basically flat, and then ultrasonically in ethanol and distilled water for 10min (Ultrasonic power is 250W), after taking out and drying, carry out electrochemical anodizing treatment as anode, with pure copper sheet as counter electrode, anodic oxidation adopts to contain 0.4wt%NH 4 F. The ethylene glycol solution of 3.0vol% perchloric acid is used as the electrolyte, the oxidation voltage is 40V, the reaction temperature is 40°C, and the oxidation time is 20min to obtain the electrode matrix;

[0067] (2) The electrode substrate is used as the anode, and the pure copper sheet is used as the counter electrode for electrochemical anodic oxidation treatment, and the anodi...

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Abstract

The invention provides an iron-based nano-array electrocatalytic electrode, a preparation method thereof and an alkaline fuel cell. The iron-based nano-array electrocatalytic electrode comprises an iron-based substrate and a nano-array structure on the surface of the iron-based substrate, and the nano-array structure is composed of a compound of iron oxide and ferroferric oxide. The iron-based nano-array electrocatalytic electrode is prepared through anode oxidation, ultrasonic-assisted anode oxidation and annealing treatment. The iron-based nano-array electrocatalytic electrode can promote oxygen reduction reaction in an alkaline medium, cathode oxygen reduction peak current density and semiwave potential can be close to those of a commercial Pt / C catalyst, initial potential forward movement is 50mV, electrocatalytic effect is good, catalytic activity of the electrode after being used for a long time is basically free of attenuation, current density is increased by higher than 30%, and stability and catalytic activity are both improved. The iron-based nano-array electrocatalytic electrode is simple to prepare, low in cost and good in application prospect.

Description

technical field [0001] The invention belongs to the technical fields of material chemistry and electrochemical catalyst fuel cell, and relates to an iron-based nano-array electrocatalytic electrode, in particular to an iron-based nano-array electrocatalytic electrode, a preparation method thereof and an alkaline fuel cell. Background technique [0002] With the deepening of the energy crisis, the development of clean and efficient new energy industries can effectively alleviate energy security and environmental problems. Alkaline fuel cell is an energy device that directly converts chemical energy stored in fuel and oxidant into electric energy efficiently and cleanly. It has the advantages of sufficient fuel source, low price, high energy density, high power, and no pollution. It is one of the devices that researchers call to solve future energy problems. Therefore, its application in the automotive power industry, power generation equipment, portable electronic devices, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/90H01M4/88H01M8/083B82Y40/00
CPCB82Y40/00H01M4/8652H01M4/8817H01M4/8853H01M4/9016H01M4/9075H01M8/083Y02E60/50Y02P70/50
Inventor 金伟薛玉冬郑诗礼杜浩王少娜张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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