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Iridium-based solid solution perovskite catalyst srti(ir)o 3 and its application in electrocatalytic water splitting for oxygen production

A technology of solid solution and perovskite, applied in the direction of electrolytic components, electrolytic process, electrodes, etc., can solve the problem of reducing the amount of Ir, achieve the effect of reducing the amount, good repeatability, and increasing the specific surface area

Active Publication Date: 2020-05-12
合肥动量守恒绿色能源有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, perovskite SrIrO 3 Not SrIrO 3 The most stable crystal phase, its metastability has brought great challenges to its synthesis, usually the method of high temperature and high pressure synthesis and template extension growth can be used to synthesize perovskite SrIrO 3 pure phase
At the same time, SrIrO 3 It is possible to further reduce the amount of Ir in

Method used

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  • Iridium-based solid solution perovskite catalyst srti(ir)o <sub>3</sub> and its application in electrocatalytic water splitting for oxygen production
  • Iridium-based solid solution perovskite catalyst srti(ir)o <sub>3</sub> and its application in electrocatalytic water splitting for oxygen production
  • Iridium-based solid solution perovskite catalyst srti(ir)o <sub>3</sub> and its application in electrocatalytic water splitting for oxygen production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Iridium-Based Solid Solution Perovskite Catalyst SrTi(Ir)O 3 (Ir-19%) Preparation

[0034] Put 420mg (1.985mmol) of strontium nitrate, 280mg (1.332mmol) of citric acid and 80mg (0.166 mmol) of potassium hexachloroiridate (IV) into 10mL of distilled water, stir well to form a dark brown transparent solution, called solution a; Transfer 225 mg (0.664 mmol) of tetrabutyl titanate into 4 mL of ethylene glycol, and stir well until a clear, colorless and transparent solution appears, which is called solution b. The solution a was slowly transferred to the solution b, and placed in a water bath at 70° C. for 3 hours with stirring and heating. At this time, the solution appeared as a brownish-red transparent solution. Subsequently, the solution was placed at 120° C. for 12 hours to ensure that the water was evaporated to dryness. In this example, n a :n b :( c +n d )=2.4:1.6:1; n c :n d =4:1. The evaporated solid sample was heated at 200°C, 300°C, 500°C and 600°C at a ...

Embodiment 2

[0047] Same as Example 1, only iridium-based solid solution perovskite SrTi(Ir)O 3 In the preparation of (Ir-19%), 420 mg (1.985mmol) strontium nitrate was reduced to 350mg (1.654mmol), at this time n a :n b :(n c +n d )=2:1.6:1, the amount and condition of other reactants remain unchanged, and what is obtained is still SrTi(Ir)O 3 (Ir-19%).

[0048] Iridium-Based Solid Solution Perovskite SrTi(Ir)O 3 In the preparation of (Ir-29%), 420mg (1.985mmol) strontium nitrate was reduced to 210mg (0.993mmol), at this time n a :n b :(n c +n d )=2:2.7:1, the amount and conditions of other reactants remain unchanged, and what is obtained is still SrTi(Ir)O 3 (Ir-29%).

[0049] Iridium-Based Solid Solution Perovskite SrTi(Ir)O 3 In the preparation of (Ir-42%), the amount of 420mg (1.985mmol) strontium nitrate is reduced to 140mg (0.661mmol), at this moment n a :n b :(n c +n d )=2:4:1, the amount and conditions of other reactants remain unchanged, and what is obtained is sti...

Embodiment 3

[0053] Same as Example 1, only iridium-based solid solution perovskite SrTi(Ir)O 3 In the preparation of (Ir-19%), 420 mg (1.985mmol) strontium nitrate was increased to 3500mg (16.540mmol), at this time n a :n b :(n c +n d )=20: 1.6:1, the amount and conditions of other reactants remain unchanged, and what is obtained is still SrTi(Ir)O 3 (Ir-19%).

[0054] Iridium-Based Solid Solution Perovskite SrTi(Ir)O 3 In the preparation of (Ir-29%), 420mg (1.985mmol) strontium nitrate was increased to 2100mg (9.925mmol), at this time n a :n b :(n c +n d )=20:2.7:1, the amount and condition of other reactants remain unchanged, and what is obtained is still SrTi(Ir)O 3 (Ir-29%).

[0055] Iridium-Based Solid Solution Perovskite SrTi(Ir)O 3 In the preparation of (Ir-42%), the amount of 420mg (1.985mmol) strontium nitrate is increased to 1400mg (6.620mmol), at this time n a :n b :(n c +n d )=20:4:1, the amount and conditions of other reactants remain unchanged, and what is obt...

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Abstract

The invention provides an iridium-based solid solution perovskite catalyst SrTi(Ir)O3 and application thereof in electrocatalytic water splitting for oxygen production, and belongs to the field of inorganic functional materials. A strontium source, organic polybasic acid, a titanium source, an iridium source, organic polylol and water are uniformly mixed in a water bath at different ratios, the mixed liquid is heated to evaporate water, then sufficient calcination is performed, and finally, acid treatment is performed to obtain the solid solution perovskite catalysts SrTi(Ir)O3 with differentiridium contents. By using classical perovskite SrTiO3 to induce the synthesis of SrIrO3, the usage of the noble metal, namely iridium, in a system is greatly reduced while the specific surface area of the SrIrO3 is increased. Meanwhile, titanium at a B site is capable of weakening the oxygen adsorption ability of active site iridium at the rest of B sites, also enabling the p zone center of oxygen to be much closer to a Fermi level, and finally enabling the performance of the catalyst for electrocatalytic oxidation of acidic water to be improved, wherein SrTi(Ir)O3(Ir-29%) has the best electrocatalytic activity for acidic water oxidation, and the current density can reach 10 mA / cm<2> with only 248mV overpotential.

Description

technical field [0001] The invention belongs to the field of inorganic functional materials, and in particular relates to an iridium-based solid solution perovskite catalyst and its application in electrocatalytic water splitting for oxygen production. Background technique [0002] After entering the 21st century, environmental pollution and energy crisis have become two major problems facing all mankind. Therefore, the development of energy storage methods and the study of their conversion process have become the key to the development of clean and renewable energy. Oxygen evolution reaction (OER) is an important half-reaction in water splitting reactions, but its slow reaction kinetics greatly hinders its wide application. Usually, a large overpotential is needed to achieve the expected current density, which also leads to a serious loss of the overall efficiency of water splitting, especially in acidic water splitting systems. At the same time, most compounds with oxygen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/08C25B1/04
CPCC25B1/04C25B11/04Y02E60/36
Inventor 邹晓新梁宵
Owner 合肥动量守恒绿色能源有限公司
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