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NiO/C@NiFeLDH composite material and preparation method and application thereof

A composite material and reaction technology, applied in the field of electrochemistry, can solve the problems of high cost and material hindering practical application, and achieve the effects of easy control, good electrochemical catalytic activity, and simple preparation method

Active Publication Date: 2019-06-28
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Noble metal catalysts such as RuO 2 and IrO 2 Effective for OER, but they are expensive, and high cost and scarcity of materials severely hinder their practical application

Method used

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  • NiO/C@NiFeLDH composite material and preparation method and application thereof
  • NiO/C@NiFeLDH composite material and preparation method and application thereof
  • NiO/C@NiFeLDH composite material and preparation method and application thereof

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preparation example Construction

[0025] The invention provides a method for preparing a NiO / C@NiFeLDH composite material, comprising the following steps: (1) calcining the Ni-MOF precursor in an inert atmosphere to obtain carbon-containing nickel oxide; (2) oxidizing the carbon-containing Nickel is mixed and contacted in the first solvent containing surfactant to obtain functionalized carbon-containing nickel oxide; (3) disperse functionalized carbon-containing nickel oxide, nickel salt, iron source, urea, and trisodium citrate in In the second solvent, the heating reaction is carried out again.

[0026] Through the above technical scheme, the present invention has prepared NiO / C@NiFeLDH composite material, which can be used as an oxygen evolution reaction catalyst and has better electrochemical catalytic activity. Compared with commercial RuO 2 There is a smaller overpotential, and the Tafel slope is also lower than that of commercial RuO 2 , while being cheaper. Moreover, the preparation method of the pre...

preparation example

[0052] Prepared according to the method described in the literature: Shujin Hou Xingtao Xu Miao Wang Yingqiao Xu Ting Lu YefengYao and Likun Pan* "Carbon-incorporated Janus-type Ni2P / Ni hollow spheres for high performance hybrid supercapacitors" J.Mater.Chem.A 2017 519054. Ni-MOFs:

[0053] 864mg Ni(NO 3 ) 2 6H2O, 300mg trimesic acid (BTC) and 3.0g polyvinylpyrrolidone, Mw=40000) were dissolved in N,N-dimethylformamide (20mL ), ethanol (20 mL) and water (20 mL), stirred magnetically for 3 hours. The obtained homogeneous green solution was poured into a 100 mL polytetrafluoroethylene-lined stainless steel autoclave and reacted in an oven at 150 °C for 10 hours. After the autoclave was naturally cooled to room temperature, the solid product was centrifuged at 6000 rpm for 5 minutes, washed with and ethanol three times, and then dried in an oven at 60 °C overnight.

Embodiment 1

[0055] 1) The Ni-MOF prepared in the preparation example was calcined at 800° C. for 3 h in a nitrogen atmosphere, and the heating and cooling rates were both 3° C. / min to obtain NiO / C.

[0056] 2) 3g of PVP (polyvinylpyrrolidone) was dispersed in 15ml of ethanol, and then 50mg of NiO / C was added, stirred at room temperature (20°C) for 12h and centrifuged to dry to obtain functionalized NiO / C.

[0057] 3) Add 50 mg of functionalized NiO / C that has been dried by centrifugation into 34 ml of water, and sonicate for 1 h. Add 0.05mmol Ni(NO 3 ) 2 ·6H 2 O, 0.02mmol Fe(NO 3 ) 3 9H 2 O, 0.02mmol urea and 0.01mmol Na 3 C 6 h 5 o 7 2H 2 O, ultrasound 1h.

[0058] Hydrothermal treatment was carried out in an autoclave at 140 °C for 26 hours. After cooling the solution to room temperature, the product was washed with distilled water and ethanol, and then dried at 60 °C overnight.

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Abstract

The invention discloses a NiO / C@NiFeLDH composite material and a preparation method and application thereof. The preparation method comprises the following steps of:(1) calcining a Ni-MOF precursor inan inert atmosphere to obtain carbon-containing nickel oxide; (2) mixing and contacting the carbon-containing nickel oxide in a first solvent containing a surfactant to obtain functionalized carbon-containing nickel oxide; and (3) dispersing the functionalized carbon-containing nickel oxide, nickel salt, an iron source, urea and trisodium citrate in a second solvent, and then carrying out heatingreaction. The composite material can be used for an oxygen evolution reaction catalyst, has better electrochemical catalytic activity, has smaller over-potential compared with commercial RuO2, has lower Tafel slope than commercial RuO2, and is also cheaper. In addition, the preparation method is simple and easy to control, and has higher popularization and application value.

Description

technical field [0001] The present invention relates to the field of electrochemistry, in particular to a NiO / C@NiFeLDH composite material and its preparation method and application. Background technique [0002] The increasingly serious energy crisis and serious environmental problems urgently need to be solved by developing clean and sustainable energy. As the world places emphasis on reducing carbon emissions, electricity generated from renewable energy sources has become an important energy source. Hydrogen energy will help address a range of energy needs that are difficult to achieve through direct electrification. At present, hydrogen energy is still the transformation of the global energy system. the missing link. Electrochemical water splitting is a sustainable and environmentally friendly method for producing clean hydrogen fuels. However, the hydrogen evolution reaction at the cathode is severely constrained by the sluggish kinetics of oxygen generation at the an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755C25B1/04C25B11/06
CPCY02E60/36
Inventor 王银玲李雪范明丽卫丹丹
Owner ANHUI NORMAL UNIV
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