Perovskite oxide catalyst and preparation method and application thereof

A perovskite oxide and catalyst technology, applied in the field of electrochemical catalysis, can solve the problems of high price, poor stability, and low precious metal reserves, and achieve excellent oxygen evolution activity and simple method

Active Publication Date: 2019-05-17
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional catalysts often contain noble metals (such as RuO2 and IrO2), but due to the low reserves, high price and poor stability of noble metals, it is urgent to develop other non-noble metal oxygen evolution (OER) catalysts

Method used

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  • Perovskite oxide catalyst and preparation method and application thereof
  • Perovskite oxide catalyst and preparation method and application thereof
  • Perovskite oxide catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] SrTi 0.175 Nb 0.025 co 0.8 o 3-δ Catalyst preparation and evaluation of oxygen evolution activity

[0030] SrTi 0.175 Nb 0.025 co 0.8 o 3-δ The catalyst powder is prepared by a sol-gel method. Take tetrabutyl titanate, niobium oxalate, strontium nitrate, and cobalt nitrate in stoichiometric ratio respectively, add citric acid (CA) and ethylenediaminetetraacetic acid (EDTA), add deionized water and heat on a magnetic stirrer to obtain For the corresponding solution, add ammonia water to adjust the pH value to about 7, continue to stir and heat until the solution becomes gelatinous, put the beaker in an oven at 250°C, and heat for 5 hours to obtain a solid precursor, and place the precursor in a muffle furnace, after calcination at 950°C for 5 hours, the desired SrTi 0.175 Nb 0.025 co 0.8 o 3-δ perovskite oxide. Change the corresponding stoichiometric ratio, repeat the above steps, and use the same method to prepare SrTi 0.15 Nb 0.05 co 0.8 o 3-δ , SrTi ...

Embodiment 2

[0036] SrTi 0.1 Nb 0.1 co 0.8 o 3-δ Preparation and Oxygen Evolution Activity Evaluation of Perovskite Oxide

[0037] SrTi 0.1 Nb 0.1 co 0.8 o 3-δ The catalyst powder is prepared by a solid phase method. The specific steps are to combine SrCO with stoichiometric ratio 3 、TiO 2 , Nb 2 o 5 、Co 2 o 3 , Dispersed in ethanol solution, ball milled for 1h, after the solvent was evaporated, roasted. The calcination temperature is 1250°C, and the calcination time is 20h. Figure 7 The given X-ray diffraction (XRD) curve shows that the synthesized catalyst forms a perovskite structure.

[0038] Oxygen evolution performance evaluation of catalysts. The electrode preparation and testing process are the same as in Example 1. Figure 8 The prepared SrTi is given 0.1 Nb 0.1 co 0.8 o 3-δ perovskite oxide in O 2 Polarization curve in saturated 0.1mol / L KOH solution.

Embodiment 3

[0040] SrTi 0.1 Nb 0.1 Fe 0.8 o 3-δ Preparation and Oxygen Evolution Activity Evaluation of Perovskite Oxide

[0041] SrTi 0.1 Nb 0.1 Fe 0.8 o 3-δ Perovskite oxides were prepared by a solid-state method, and the specific steps were stoichiometrically mixing SrCO 3 、TiO 2 , Nb 2 o 5 , Fe 2 o 3 , Dispersed in ethanol solution, ball milled for 1h, after the solvent was evaporated, roasted. The calcination temperature is 1250°C, and the calcination time is 20h. Synthesized according to stoichiometric ratio. Figure 9 X-ray diffraction (XRD) curves are given, showing that the synthesized catalyst forms a perovskite structure. Figure 10 The prepared SrTi is given 0.1 Nb 0.1 Fe 0.8 o 3-δ perovskite oxide in O 2 Polarization curve in saturated 0.1mol / L KOH solution.

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Abstract

The invention discloses a perovskite oxide catalyst, a preparation method thereof, and application of the perovskite oxide catalyst to an oxygen evolution reaction. The structural formula of the perovskite oxide catalyst is ABO3-delta, wherein A is a rare-earth metal element or an alkaline earth element, B is a transition metal element, delta is greater than or equal to 0 and less than or equal to1, and B is selected from two or more of Nb, Ti, Co, Mn, Fe, Ni, Al, Mo, Cu, Sc or Cr. The perovskite oxide catalyst has the excellent oxygen evolution reaction (OER) activity and stability, and canserve as an electric catalyst in the fields such as renewable fuel cells, rechargeable metal-air batteries and water electrolysis. The perovskite oxide catalyst can be prepared through traditional technologies such as a sol-gel method and a solid phase method, the method is simple, and the perovskite oxide catalyst has potential of large-scale preparation.

Description

technical field [0001] The invention belongs to the field of electrochemical catalysis, and in particular relates to a perovskite oxide catalyst, a preparation method thereof and an application thereof in an oxygen evolution reaction. Background technique [0002] In today's world, energy crisis and environmental pollution are two major problems facing mankind. At present, the world's energy consumption is still dominated by fossil energy, such as: coal, oil, natural gas and so on. Due to the acceleration of industrialization on a global scale, the demand for energy is increasing day by day, and a large amount of fossil energy has been continuously mined, which has also led to problems such as energy depletion and land desertification. Due to the unreasonable energy structure and the limitation of technical level, traditional fossil fuels not only have low energy utilization rate, but also produce a large amount of carbon dioxide, nitrogen oxides, sulfide and other waste ga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/847H01M4/90C25B1/04C25B11/06
CPCY02E60/36Y02E60/50
Inventor 梁凤丽邓海鹏毛军逵杨紫琼
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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