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Oxygen evolution reaction catalyst, preparation, application, electrolysis device and seawater cracking method

A technology for oxygen evolution reaction and catalyst, applied in the electrolysis process, electrolysis components, electrodes, etc., can solve the problem of inability to meet high current density and other problems, achieve excellent OER performance, high performance, and meet the effect of high current density

Active Publication Date: 2021-03-16
UNIV OF JINAN
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Problems solved by technology

[0005] The purpose of the embodiment of the present application is to provide an oxygen evolution reaction catalyst, preparation, application, electrolysis device and seawater cracking method, so as to solve the problem that the seawater cracking electrocatalyst in the prior art cannot meet the high current density (≥500mA / cm 2 ) and the technical problem of the demand under low overpotential ≤ 300mV

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  • Oxygen evolution reaction catalyst, preparation, application, electrolysis device and seawater cracking method
  • Oxygen evolution reaction catalyst, preparation, application, electrolysis device and seawater cracking method
  • Oxygen evolution reaction catalyst, preparation, application, electrolysis device and seawater cracking method

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preparation example Construction

[0035] The application also provides a method for preparing an oxygen evolution reaction catalyst, comprising the following steps:

[0036] After the nickel foam is immersed in the ethanol solution of the metal precursor, it is taken out and dried; the ethanol solution of the metal precursor is an ethanol solution of ferric chloride and nickel chloride;

[0037] Ammonium bicarbonate is added into the ethanol solution of the metal precursor to dissolve, and the dried nickel foam is immersed in it, taken out and dried to obtain an oxygen evolution reaction catalyst.

[0038] Specifically, a metal precursor ethanol solution may be prepared first, and ferric chloride and nickel chloride are dissolved in ethanol to form a solution. Then immerse the nickel foam in the ethanol solution of the metal precursor for a certain period of time, such as 10 to 20 minutes, and then take it out. The nickel foam can be flattened and dried, such as drying at room temperature or by drying at a rel...

Embodiment 1

[0063] Preparation of catalysts for oxygen evolution reaction (amorphous / nanocrystalline and crystalline FeNiCH / NF)

[0064] Clean the NF three times ultrasonically with 3.0M hydrochloric acid, 95% ethanol and deionized water to remove impurities such as nickel oxide on the surface. A piece of NF (20×10×1.8mm) was immersed in 24.4mM FeCl 3 ·6H 2 O+2.71mM NiCl 2 ·6H 2 O in 60 mL of ethanol for 15 minutes, and then dried in air overnight. Then 0.71g NH 4 HCO 3 Add to the ethanol solution of the metal precursor mentioned above and stir vigorously. The above-mentioned NF was immersed in the above-mentioned solution for 6 hours at room temperature, so that the surface was covered with a layer of basic iron-nickel carbonate (FeNiCH). The obtained amorphous / nanocrystalline FeNiCH / NF was soaked in deionized water for 10-20 minutes to remove surface impurities, and then dried overnight in air to obtain amorphous / nanocrystalline and crystalline FeNiCH / NF.

Embodiment 2

[0066] This embodiment provides a kind of electrolysis device, and its electrolysis device comprises electrolytic cell, and the anode of electrolytic cell is the amorphous / nanocrystalline and crystalline FeNiCH / NF of embodiment 1, and the negative electrode of electrolytic cell is MoNi 4 / NF.

[0067] Mo Ni 4 The / NF catalyst can be synthesized using the following exemplary method.

[0068] Mo Ni 4 / NF catalyst synthesis. Clean the NF three times ultrasonically with 3.0M hydrochloric acid, 95% ethanol and deionized water to remove impurities such as nickel oxide on the surface. Prepare 15mL containing Ni(NO 3 ) 2 ·6H 2 O(0.04M) and (NH 4 ) 6 Mo 7 o 24 4H 2 O (0.01M) aqueous solution, transfer the aqueous solution and a piece of NF (20 × 10 × 1.8 mm) to a stainless steel autoclave with a capacity of 40 mL of polytetrafluoroethylene lining, keep it sealed at 150 ° C for 6 hours, and then naturally cool to room temperature. After washing with deionized water, NiMoO w...

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Abstract

The embodiment of the invention provides an oxygen evolution reaction catalyst, preparation, an application, an electrolysis device and a seawater cracking method. The oxygen evolution reaction catalyst comprises a foamed nickel substrate and amorphous / nanocrystalline basic iron carbonate loaded on the foamed nickel substrate. The amorphous and nanocrystalline mixed structures of basic nickel ironcarbonate (FeNiCH) contain more surface adsorption oxygen and oxygen defects, which can adjust the electronic structure of Fe (III) / Ni (II) and optimize the adsorption energy of the OER intermediate.The surface adsorption oxygen and defect oxygen may be related to chloride resistance and high corrosion resistance. Therefore, the electro-catalytic OER performance of the oxygen evolution reactioncatalyst is less affected by chloride ions, the high performance of the electrolytic tank can be well maintained for a long time when the oxygen evolution reaction catalyst is applied to the electrolytic tank, and the oxygen evolution reaction catalyst shows excellent OER performance in alkaline offshore seawater electrolysis and can meet the requirements of high current density (greater than or equal to 500mA / cm<2>) and low overpotential (less than or equal to 300mV).

Description

technical field [0001] The present application relates to the field of seawater cracking, more specifically, to an oxygen evolution reaction catalyst, preparation, application, electrolysis device and seawater cracking method. Background technique [0002] Seawater accounts for 97% of the world's total water resources and is one of the most abundant natural resources on earth. Direct cracking of seawater to produce clean hydrogen fuel is a promising renewable energy storage technology. In particular, the decomposition of polluted seawater, which can produce high-purity hydrogen fuel while remediating polluted seawater, has become a potential solution to global energy and environmental problems. However, a major challenge in seawater splitting is that various dissolved ions from seawater may poison or degrade the cathode and anode electrocatalysts. Chloride ions in seawater may form active chlorine compounds during the reaction process, causing serious corrosion effects on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/054C25B11/031C25B11/052C25B11/061C25B11/075C25B1/04C25B9/17B82Y30/00B82Y40/00
CPCC25B1/04B82Y30/00B82Y40/00Y02E60/36
Inventor 康青涂青青江萌汪鹏程周伟家周飞艨
Owner UNIV OF JINAN
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