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Porous IrO2 oxygen evolution catalyst with super-high specific surface area and preparation method of porous IrO2 oxygen evolution catalyst

An ultra-high specific surface area and catalyst technology, applied in the field of electrochemistry, can solve the problems of increasing the difficulty of controlling the structure and pore structure, accelerating proton transfer, reducing the active area of ​​catalysts, etc.

Active Publication Date: 2016-11-16
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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Problems solved by technology

[0003] However, the slower kinetics of the oxygen evolution reaction on the anode side and the higher overpotential make the development of oxygen evolution catalysts an important direction for the large-scale application of SPE water electrolysis technology.
At present, the most widely used oxygen evolution reaction catalyst is noble metal oxide IrO 2 , and most of them exist in the form of nanoparticles, such as the traditional Adams-fusion method (K. Papazisi, A. Siokou, S. Balomenou and D. Tsiplakides, Int. J. Hydrogen. Energy., 2012, 37, 16642-16648; E. Rasten, G. Hagen and R. Tunold, Electrochim. Acta., 2003, 48, 3945-3952), Pechini-Adams method (N. Mamaca, E. Mayousse, S. Arrii-Clacens, T. Napporn, K .Servat, N.Guillet and K.Kokoh, Appl.Catal.B:Environ.,2012,111-112,376-380) and Colloidal method(J.Cruz,V.Baglio,S.Siracusano,R.Ornelas,L. Ortiz-Frade, L. Arriaga, V. Antonucci and A. Arico, J. Nanopart. Res, 2011, 13, 1639-1646; A. Marshall, S. Sunde, M. Tsypkin and R. Tunold, Int. J. Hydrogen. Energy.,2007,32,2320-2324), while granular catalysts are easy to agglomerate, which will greatly reduce the active area of ​​the catalyst, and the effective contact between the electrolyte solution and the internal active sites will be limited, resulting in rapid catalytic performance decline
[0004] By template method (E.Ortel, T.Reier, P.Strasser and R.Kraehnert, Chem.Mater., 2011, 23, 3201-3209; W.Hu, Y.Wang, 6.Hu, Y.Zhou and S .Chen, J.Mater.Chem.,2012,22,6010-6016; D.Chandra,N.Abe,D.Takama,K.Saito,T.Yui and M.Yagi,ChemSusChem,2015,8,795-799) Prepared IrO with porous structure 2 Catalysts can effectively increase the active area and accelerate proton transfer. However, the removal of the template increases the difficulty of controlling the structure, especially the pore structure. Therefore, it is urgent to find a relatively simple non-template method for the preparation of porous IrO. 2 catalyst

Method used

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  • Porous IrO2 oxygen evolution catalyst with super-high specific surface area and preparation method of porous IrO2 oxygen evolution catalyst
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  • Porous IrO2 oxygen evolution catalyst with super-high specific surface area and preparation method of porous IrO2 oxygen evolution catalyst

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preparation example Construction

[0037]The present invention firstly provides a porous ultra-high specific surface area IrO 2 A method for preparing an oxygen evolution catalyst, the method comprising:

[0038] Step 1: H 2 IrCl 6 ·6H 2 The O precursor is added to deionized water to obtain a first solution;

[0039] Step 2: Add NH to the first solution obtained in Step 1 3 ·H 2 O reacts to obtain the second solution;

[0040] Step 3: Add NaNO to the second solution obtained in Step 2 3 Reaction, obtain the 3rd solution;

[0041] Step 4: Evaporate the solvent in the third solution obtained in step 3 to dryness, and burn the product obtained in the air to obtain porous ultra-high specific surface area IrO 2 Oxygen evolution catalyst.

[0042] According to the present invention, H 2 IrCl 6 ·6H 2 The O precursor is added to deionized water to obtain a first solution, and the concentration of the first solution is preferably 0.005-0.02mol L -1 .

[0043] According to the present invention, NH is added...

Embodiment 1

[0060] 1) put H 2 IrCl 6 ·6H 2 The O precursor was added to deionized water to obtain the first solution with a concentration of 0.01 mol L -1 .

[0061] 2) Add NH to the first solution in 1) 3 ·H 2 O, H 2 IrCl 6 ·6H 2 O and NH 3 ·H 2 The molar ratio of O was 1:100, and ultrasonic reaction was performed for 3 h to obtain the second solution.

[0062] 3) adding NaNO to the second solution in 2) 3 , H 2 IrCl 6 ·6H 2 O and NaNO 3 The mass ratio of the solution was 1:20, and the ultrasonic reaction was performed for 1 h to obtain the third solution.

[0063] 4) The third solution in 3) was reacted in a water bath at 80° C. until the solvent was evaporated to dryness to obtain the first product.

[0064] 5) Burning the first product described in 4) in an air atmosphere for 0.5h, the burning temperature is 450°C,

[0065] Cool to room temperature, wash, filter with suction, and dry overnight under vacuum at 60°C to obtain the IrO 2 catalyst.

[0066] Embodiment 1 ...

Embodiment 2

[0069] 1) put H 2 IrCl 6 ·6H 2 The O precursor was added to deionized water to obtain the first solution with a concentration of 0.005 mol L -1 .

[0070] 2) Add NH to the first solution in 1) 3 ·H 2 O, H 2 IrCl 6 ·6H 2 O and NH 3 ·H 2 The molar ratio of O was 2:20, and the ultrasonic reaction was performed for 4 hours to obtain the second solution.

[0071] 3) adding NaNO to the second solution in 2) 3, H 2 IrCl 6 ·6H 2 O and NaNO 3 The mass ratio of the solution was 1:20, and the ultrasonic reaction was performed for 2 hours to obtain the third solution.

[0072] 4) The third solution in 3) was reacted in a water bath at 80° C. until the solvent was evaporated to dryness to obtain the first product.

[0073] 5) Burning the first product described in 4) in an air atmosphere for 0.5h, the burning temperature is 450°C,

[0074] Cool to room temperature, wash, filter with suction, and dry overnight under vacuum at 60°C to obtain the IrO 2 catalyst.

[0075] Wi...

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Abstract

The invention provides a porous IrO2 oxygen evolution catalyst with a super-high specific surface area and a preparation method of the porous IrO2 oxygen evolution catalyst, and relates to the field of electrochemistry. The method comprises the following steps: firstly, a H2IrCl6.6H2O precursor is added to deionized water, and a first solution is obtained; then NH3.H2O is added to the first solution for a reaction, and a second solution is obtained; NaNO3 is added to the second solution for a reaction, and a third solution is obtained; finally, a solvent in the third solution is evaporated to dryness, a product is ignited in the air, and the IrO2 oxygen evolution catalyst is obtained. The invention further provides the IrO2 oxygen evolution catalyst prepared with the method. The IrO2 oxygen evolution catalyst has a porous structure and the super-high specific surface area and shows excellent oxygen evolution catalytic performance.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a porous ultra-high specific surface area IrO 2 Oxygen evolution catalyst and its preparation method. Background technique [0002] Hydrogen production by water electrolysis is a relatively mature technology for producing high-purity hydrogen. However, the commonly used alkaline water electrolysis technology has disadvantages such as easy loss of liquid electrolyte and easy corrosion of equipment. In contrast, solid polymer electrolyte (SPE) water electrolysis has higher safety reliability, current density, energy efficiency and specific capacity. And the purity of hydrogen produced by the SPE water electrolysis cell can be as high as 99.99%. These advantages make SPE water electrolysis a research hotspot in hydrogen production technology in recent years. [0003] However, the slower kinetics of the oxygen evolution reaction on the anode side and the higher overpotential make ...

Claims

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Application Information

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IPC IPC(8): B01J23/46B01J35/10C25B1/04C01G55/00
CPCC25B1/04C01G55/004B01J23/468C01P2006/12C01P2004/04B01J35/60B01J35/615Y02E60/36
Inventor 邢巍李国强刘长鹏葛君杰常进法李晨阳梁亮
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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