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Method for preparing porous N-rich cobalt nitride with hard template method and application

A hard template method, cobalt nitride technology, applied in chemical instruments and methods, nitrogen compounds, catalyst activation/preparation, etc., can solve problems such as hindering the efficiency of oxygen evolution reaction, hindering the transmission of electrons from electrocatalyst to current collector, etc. Low cost, excellent catalytic activity, mild preparation conditions

Inactive Publication Date: 2019-08-30
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to achieve the above purpose, the present invention provides a method for preparing porous nitrogen-rich cobalt nitride by a hard template method, which solves the problem that most of the electrocatalysts with abundant earth reserves in the prior art hinder the electrocatalyst from reaching the current collector due to its insulator or semiconductor characteristics. The electron transfer between them greatly hinders the efficiency of the oxygen evolution reaction (OER)

Method used

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  • Method for preparing porous N-rich cobalt nitride with hard template method and application
  • Method for preparing porous N-rich cobalt nitride with hard template method and application
  • Method for preparing porous N-rich cobalt nitride with hard template method and application

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Embodiment 1

[0048] Step S1, preparing Co(OH) 2 NFWs precursor:

[0049] Co(OH) 2 The precursor of NFWs was synthesized by hydrothermal method without using sodium polystyrene sulfonate pellets (PSs) as a template, and 3.5 mmol Co(CH 3 COO) 2 4H 2 0. Add 7mmol of hexamethyltetramine (HMT) into 60mL of deionized water and stir for 2h, add the above mixed solution into 80mL of polytetrafluoroethylene-lined high-pressure axe, place in a high-temperature oven, and keep at 120°C for 12h. After the reaction is complete, after the high-pressure ax and the product are cooled to room temperature, the product is washed 4 times with deionized water and absolute ethanol, and dried overnight at 60°C to obtain Co(OH) 2 NFWs; while using the same method to prepare Co(OH) 2 NFWs precursor but using sodium polystyrenesulfonate pellets (PSs) as a template, 3.5mmol Co(CH 3 COO) 2 4H 2 O, 7mmol / L sodium polystyrene sulfonate pellets (PSs), 7mmol hexamethyltetramine (HMT) were added to 60mL deionized w...

Embodiment 2

[0055] Modify step S1 of Example 1 to prepare Co(OH) 2 NFWs precursor: Co(OH) 2 The precursor of NFWs was synthesized by hydrothermal method without using sodium polystyrene sulfonate pellets (PSs) as a template, and 2.5 mmol Co(CH 3 COO) 2 4H 2 0. 5 mmol of hexamethyltetramine (HMT) was added to 40 mL of deionized water and stirred for 1 h, the above mixed solution was added to a 60 mL polytetrafluoroethylene-lined high-pressure axe, placed in a high-temperature oven, and kept at 110 ° C for 11 h, After the reaction is complete, after the high-pressure ax and the product are cooled to room temperature, the product is washed three times with deionized water and absolute ethanol, and dried overnight at 40°C to obtain Co(OH) 2 NFWs; while using the same method to prepare Co(OH) 2 NFWs precursor but using sodium polystyrenesulfonate pellets (PSs) as a template, 2.5mmol Co(CH 3 COO) 2 4H 2 0, 5mmol / L sodium polystyrene sulfonate pellets (PSs), 5mmol hexamethyltetramine (HMT...

Embodiment 3

[0057] Modify step S1 of Example 1 to prepare Co(OH) 2 NFWs precursor: Co(OH) 2 The precursor of NFWs was synthesized by hydrothermal method without using sodium polystyrene sulfonate pellets (PSs) as a template, and 5 mmol Co(CH 3 COO) 2 4H 2 O. 10mmol of hexamethyltetramine (HMT) was added to 80mL of deionized water and stirred for 3h, the above mixed solution was added to a 100mL polytetrafluoroethylene-lined high-pressure axe, placed in a high-temperature oven, and kept at 130°C for 13h. After the reaction is complete, after the high-pressure ax and the product are cooled to room temperature, the product is washed 6 times with deionized water and absolute ethanol, and dried overnight at 80°C to obtain Co(OH) 2 NFWs; while using the same method to prepare Co(OH) 2 NFWs precursor but using sodium polystyrenesulfonate pellets (PSs) as a template, 5mmol Co(CH 3 COO) 2 4H 2 O, 10mmol / L sodium polystyrene sulfonate pellets (PSs), 10mmol hexamethyltetramine (HMT) were adde...

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Abstract

The invention discloses a method for preparing porous N-rich cobalt nitride with a hard template method and an application. The prepared porous N-rich cobalt nitride is applied to oxygen evolution reaction catalysis. Cheap cobalt nitrate and sodium polystyrenesulfonate spheres are taken as templates, dried at a low temperature with a hydrothermal method and finally heated in a tubular furnace withthe temperature range of 350-450 DEG C and kept for 1.5-2.5 h under the ammonia atmosphere condition, and a porous N-rich Co2N0.67 NFWs (Co2N0.67 nanoflowers) can be prepared. Compared with conventional oxygen evolution reaction catalyst material noble metal, the prepared porous N-rich cobalt nitride has lower onset potential and Eta10 (the potential value when the current density is 10 mA / cm<2>)and higher long-term stability, preparation materials are low in cost and have abundant reserves on the earth, and a preparation method is simple, simplified in procedure, time-saving and mild in preparation condition.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and relates to a hard template method for preparing porous nitrogen-rich cobalt nitride, which is applied to the catalysis of oxygen evolution reaction. Background technique [0002] Hydrogen (H 2 ) is currently one of the cleanest, most promising and sustainable new energy sources, it is produced by electrolysis of water, electrochemically decomposed water to obtain H 2 and O 2 However, in the process of electrocatalytic water splitting, the oxygen evolution reaction (OER) on the anode involves complex four-electron transfer and multi-step intermediate processes, which often make the reaction kinetics sluggish. A very high overpotential is required, resulting in a decrease in the efficiency of total water splitting. Electrocatalysts based on noble metals ruthenium (Ru) and iridium (Ir) (such as: RuO 2 , IrO 2 ) is currently the most efficient oxygen evolution reaction (OER) cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/10B01J37/08C01B21/06C25B1/04C25B11/06
CPCB01J27/24B01J37/10B01J37/0018C01B21/0622C25B1/04C25B11/075B01J35/33Y02E60/36
Inventor 周明刘婷婷
Owner NORTHEAST NORMAL UNIVERSITY
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