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A layered perovskite oxide, its preparation method and its application in the electrocatalysis of oxygen evolution reaction

A perovskite oxide, oxygen evolution reaction technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of high price, shortage of resources, stable Problems such as poor performance, to achieve the effect of simple preparation method

Active Publication Date: 2021-06-11
NANJING TECH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of high price, shortage of resources and poor stability of existing oxygen evolution catalysts, and provide a layered oxygen evolution electrocatalyst, which not only has excellent oxygen evolution (OER) Catalytic activity, but also has the advantages of low cost, environmental friendliness, and simple preparation method

Method used

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  • A layered perovskite oxide, its preparation method and its application in the electrocatalysis of oxygen evolution reaction
  • A layered perovskite oxide, its preparation method and its application in the electrocatalysis of oxygen evolution reaction
  • A layered perovskite oxide, its preparation method and its application in the electrocatalysis of oxygen evolution reaction

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preparation example Construction

[0041] 1. Preparation of catalyst slurry: A 3 B 2 o 7-δ The powder is mixed with a certain amount of conductive carbon black (the mass fraction of conductive carbon black is 10%-90%, which plays the role of conductivity and carrier, and has almost no catalytic effect) dispersed in ethanol or other organic solvents, and then add an appropriate amount of Nafion to it (mass fraction 5%) solution, (catalyst concentration is 1-10 mg / mL, Nafion concentration in the solution is 0.2-2 mg / mL), and then ultrasonically oscillated to mix evenly to obtain a catalyst slurry.

[0042] 2. Electrode preparation: pipette a certain amount of the above-prepared catalyst slurry onto the rotating disk electrode (RDE) with a micro-syringe, so that the loading amount on the RDE is 0.1-1 mg / cm 2 , then air dry naturally.

[0043] 3. Measurement of electrode activity: The prepared electrode was installed on a rotating disc device (Pine Company) for electrochemical testing.

[0044] The testing proc...

Embodiment 1

[0049] Example 1 Sr 3 (Co 0.8 Fe 0.2 ) 2 o 7-δ Catalyst preparation and evaluation of catalytic activity for oxygen evolution

[0050] Sr 3 (Co 0.8 Fe 0.2 ) 2 o 7-δ Catalyst powder is synthesized by solid state reaction method. Weigh the stoichiometric ratio of SrCO 3 (analytical pure), Co 3 o 4 (analytical pure) and Fe 3 o 4 (analytical pure), dissolved in ethanol (analytical pure) medium, stirred and ball-milled for 2 hours until the mixture is uniform, then further dried to evaporate the medium to obtain a solid precursor, and finally placed the precursor in a muffle furnace and roasted at 900 °C for 10 h , that is, the required Sr 3 (Co 0.8 Fe 0.2 ) 2 o 7-δ catalyst powder. figure 1 The X-ray diffraction (XRD) profile shown indicates that Sr 3 (Co 0.8 Fe 0.2 ) 2 o 7-δ A Ruddlesden-Popper layered structure is formed.

[0051] Oxygen evolution catalytic performance evaluation of catalysts. Weigh 10 mg Sr 3 (Co 0.8 Fe 0.2 ) 2 o 7-δ The cata...

Embodiment 2

[0053] Example 2 Sr 3 (Co 0.9 Nb 0.1 ) 2 o 7-δ Catalyst preparation and evaluation of catalytic activity for oxygen evolution

[0054] Sr 3 (Co 0.9 Nb 0.1 ) 2 o 7-δ Catalyst powder is synthesized by solid state reaction method. Weigh the stoichiometric ratio of SrCO 3 (analytical pure), Co 3 o 4 (analytically pure) and Nb 2 o 5 (analytical pure), dissolved in ethanol (analytical pure) medium, stirred and ball-milled for 2 h until the mixture is uniform, then further dried to evaporate the medium to obtain a solid precursor, and finally placed the precursor in a muffle furnace and roasted at 1000 °C for 10 h , that is, the required Sr 3 (Co 0.9 Nb 0.1 ) 2 o 7-δ catalyst powder. image 3 The X-ray diffraction (XRD) profile shown indicates that Sr 3 (Co 0.9 Nb 0.1 ) 2 o 7-δ A Ruddlesden-Popper layered structure is formed.

[0055] Oxygen evolution catalytic activity evaluation of catalysts. The electrode preparation and electrode testing process are ...

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Abstract

The invention relates to an oxygen evolution reaction electrocatalyst of a Ruddlesden-Popper layered perovskite oxide, the general structural formula of which is A 3 B 2 o 7‑δ , where A is one or more of rare earth metal ions or alkaline earth metal ions, B is one or more of transition metal ions, 0≤δ≤1. The oxygen evolution reaction electrocatalyst of the present invention has excellent oxygen evolution (OER) catalytic performance in alkaline solution, and its activity is better than that of commercial noble metal oxide RuO 2 catalyst. The catalyst preparation method in the present invention is simple to operate and easy to produce on a large scale, and can be widely used in electrolyzed water, metal-air batteries and other energy storage and conversion technologies involving oxygen evolution reactions, and has high practical value.

Description

technical field [0001] The invention belongs to the field of electrochemical catalysts, in particular to an electrocatalyst for oxygen evolution reaction of Ruddlesden-Popper layered perovskite oxides, which has high oxygen evolution (OER) activity and can be used for electrolysis of water, metal-air batteries and other related Electrocatalysts for energy storage and conversion technologies to oxygen evolution reactions. Background technique [0002] The increasing tension of fossil energy and the resulting environmental pollution make the development and utilization of clean and renewable energy extremely urgent. However, renewable energy sources such as solar energy, wind energy, and tidal energy are limited by intermittency and location, so it is necessary to develop new electrochemical energy systems for storage and conversion, such as renewable fuel cells, metal-air batteries, and electrolyzed water. These clean energy systems mainly involve some electrochemical reacti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/78B01J23/83B01J23/847B01J35/00C25B1/04C25B11/077
CPCB01J23/002B01J23/78B01J23/83B01J23/8474B01J35/0033B01J2523/00C25B1/04C25B11/0773B01J2523/24B01J2523/842B01J2523/845B01J2523/56B01J2523/847B01J2523/3706Y02E60/36
Inventor 周嵬朱印龙杨广明邵宗平
Owner NANJING TECH UNIV
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