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A kind of reversible phase transition vanadate electrode material and preparation method and application thereof

An electrode material, vanadate technology, applied in the direction of electrodes, chemical instruments and methods, vanadium compounds, etc., can solve the problems of easy to be oxidized catalytic activity, small polarization resistance, high current efficiency, etc., to promote electrode activation, reduce Effect of small polarization resistance and improved electrode performance

Active Publication Date: 2017-02-08
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ceramic-based La 0.2 Sr 0.8 TiO 3+δ Materials with high mixed conductivity, catalytic activity, and good redox stability have attracted extensive attention, but La 0.2 Sr 0.8 TiO 3+δ It is easy to be oxidized during high-temperature electrolysis and its catalytic activity is lower than that of traditional metal electrodes, which restricts its development.
Compared with nickel-based composite electrodes, La x Sr 1- x Cr y mn 1-y o 3-δ (LSCM) is a material with high catalytic activity and redox stability, and has very small polarization resistance, which has attracted great attention in the field of high-temperature solid oxide electrolytic cells. Under voltage, LSCM produces a large polarization resistance, which reduces the current efficiency, so further improvement and optimization are needed

Method used

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  • A kind of reversible phase transition vanadate electrode material and preparation method and application thereof
  • A kind of reversible phase transition vanadate electrode material and preparation method and application thereof
  • A kind of reversible phase transition vanadate electrode material and preparation method and application thereof

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Embodiment 1

[0027] Example 1: 0.04mol FeVO 4 Synthesis of materials, characterization of post-redox phases and testing of electrochemical AC impedance of symmetric cells.

[0028] According to the chemical formula ratio of the material, weigh 3.1938g Fe 2 o 3 (analytical pure) and 3.64g V 2 o 5As a reaction raw material; the reaction raw material is put into a ball mill jar with a volume of 100ml, using agate balls as a grinding medium, adding acetone (2 / 3rds added to cover the ball mill jar) as a dispersant, in a ball mill at 1000 rpm Ball mill for 15 minutes at a speed of 1 minute to make it evenly mixed to obtain a mixture; dry the mixture in an air atmosphere at 150°C for 1 hour, then take an appropriate amount of powder and press it into a material with a diameter of about 15mm and a thickness of about 2mm under a pressure of 4MP Finally, the pressed tablet was calcined at 750°C for 10 hours, and the calcined tablet was ground into powder in a mortar to obtain the target product ...

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Abstract

The invention discloses a reversible phase transition vanadate electrode material, and a preparation method and an application thereof. The chemical formula of the vanadate electrode material is FeVO4, the vanadate electrode material has a reversible phase transition property, that is, FeVO4 is reduced to form reducing products formed by FeV2O4 and Fe, and the reducing products are oxidized to generate the FeVO4. The above cathode material has high conductivity in reducing atmosphere, allows a metal iron catalyst to be precipitated, has a high catalytic activity, and has good performances as a high temperature solid oxide electrolytic cell cathode material.

Description

technical field [0001] The invention relates to the design field of a cathode material for an electrolytic cell, in particular to a vanadate cathode material for a solid oxide electrolytic cell capable of reversible phase transition. Background technique [0002] The high-temperature solid oxide electrolytic cell is an efficient energy conversion device. At high temperature, water vapor can be electrolyzed to produce hydrogen, and carbon dioxide can be electrolyzed to produce carbon monoxide. It has good kinetic and thermodynamic properties. The main function of the cathode (fuel pole) of the oxygen ion type solid oxide electrolytic cell is to provide a place for the decomposition reaction of water vapor or carbon dioxide and a channel for electron conduction. Therefore, in addition to matching the performance of adjacent components and having chemical compatibility and stability under long-term operation, the fuel electrode must also have good electronic conductivity and el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/06C25B1/04C25B1/00C01G31/00
CPCY02E60/36
Inventor 谢奎吴玉程秦清清
Owner HEFEI UNIV OF TECH
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