Pd nanoparticle-loaded ferronickel double hydroxide nanosheet array structure material, preparation method and application thereof

A technology of double hydroxide and nanosheet arrays, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, catalyst activation/preparation, etc. Poor activity and stability, complex preparation methods and other problems, to achieve superior activity and stability, reduce surface energy, and improve the effect of adsorption

Active Publication Date: 2020-11-03
ANHUI NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the prior art, the preparation method of combining Pd with transition metal layered double hydroxides to form heterostructure catalysts is complicated, and it is difficult to achieve uniform loading of Pd nanoparticles on the surface of double hydroxides during the preparation process.
Therefore, the high preparation cost, poor activity and stability of such catalysts in the prior art still limit the development and application of electrocatalytic water splitting.

Method used

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  • Pd nanoparticle-loaded ferronickel double hydroxide nanosheet array structure material, preparation method and application thereof
  • Pd nanoparticle-loaded ferronickel double hydroxide nanosheet array structure material, preparation method and application thereof
  • Pd nanoparticle-loaded ferronickel double hydroxide nanosheet array structure material, preparation method and application thereof

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Embodiment 1

[0053] A preparation method of Pd nanoparticles loaded NiFe LDH nanosheet array structure material, comprising the following steps:

[0054] Soak a piece of nickel foam (NF) with an area of ​​2×3cm in 6M hydrochloric acid for 15min, and then wash it three times with deionized water and absolute ethanol. Accurately measure 30mL of anhydrous methanol into a clean small beaker, accurately weigh 1mmol Ni(NO 3 ) 3 ·6H 2 O, 0.25mmol Fe(NO 3 ) 3 9H 2 O, 1 mmol urea, and 60 mg tetra-n-butylammonium bromide were added to the above-mentioned small beaker to form a mixed solution, and after ultrasonic stirring for 30 min, 444 μL was added with a concentration of 2.256×10 -2 M of H 2 PdCl 4 Solution, keep stirring to obtain a uniform tan solution, transfer the tan solution to a 50mL polytetrafluoroethylene-lined stainless steel reaction kettle, put the pre-treated foam nickel into the stainless steel reaction kettle obliquely, and heat it in a 120°C oven Medium reaction 6h. After...

Embodiment 2

[0064] Accurately measure 30mL of anhydrous methanol into a clean small beaker, accurately weigh 1mmol Ni(NO 3 ) 3 ·6H 2 O, 0.25mmol Fe(NO 3 ) 3 9H 2 O, 1mmol urea, and 60mg tetra-n-butylammonium bromide were added to the above small beaker to form a mixed solution. After ultrasonic stirring for 30min, 333μL or 555μL was added to a concentration of 2.256×10 -2 M of H 2 PdCl 4 Solution, keep stirring to obtain a uniform tan solution, transfer the tan solution to a 50mL polytetrafluoroethylene-lined stainless steel reaction kettle, put the pre-treated foam nickel into the solution obliquely, and react in an oven at 120°C 6h. After the reaction was finished, it was naturally cooled to room temperature, and the nickel foam covered by the tan sample was washed three times with deionized water and absolute ethanol respectively, and the obtained sample was dried in a vacuum drying oven at 60°C for 12 hours.

[0065] h 2 PdCl 4 When the addition amount of Pd was 333 μL, the ...

Embodiment 3

[0070] Application of a Pd nanoparticle-loaded NiFe LDH nanosheet array structure material as an oxygen evolution reaction (OER) catalyst.

[0071] The specific application method is: use Pd nanoparticles with an area of ​​0.5×0.5cm to support NiFe LDH nanosheet array structure material as the working electrode, and use platinum wire and Ag / AgCl electrode as the counter electrode and reference electrode, respectively. Electrochemical tests were performed at room temperature (25 °C) using a CHI 760E electrochemical workstation in 1.0 M KOH electrolyte solution. Commercial RuO 2 The loaded electrode was used as a benchmark to compare the OER performance. The preparation of NiFe LDH nanosheet is to omit the H in the raw material on the basis of Example 1 2 PdCl 4 Prepared, which is defined as Ni 0.8 Fe 0.2 (OH) 2 . Using linear sweep voltammetry (LSV) at 5.0mV s -1 Polarization curves were obtained at a scan rate of 90% and an ohmic compensation of 90%.

[0072] Figure...

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Abstract

The invention discloses a Pd nano-particle loaded ferronickel double hydroxide nanosheet array structure material, a preparation method and application thereof. The preparation method comprises the following steps: adding nickel salt, ferric salt, urea and quaternary ammonium salt into absolute methanol, ultrasonically dissolving the components, adding a palladium source solution, uniformly mixingthe components, transferring the mixed solution into a reaction kettle, obliquely placing foamed nickel into the mixed solution, carrying out solvothermal reaction, naturally cooling the reaction product to room temperature, and washing and drying the reaction product to obtain the Pd nanoparticle loaded NiFe LDH nanosheet array structure material. The material has the advantages of high activity, good durability, simple preparation process and low cost in alkaline electrolyte, shows excellent activity and stability for oxygen evolution reaction, hydrogen evolution reaction and total hydrolysis reaction, and has very high value in practical application of electro-catalytic water decomposition materials.

Description

technical field [0001] The invention belongs to the field of preparation methods of nanometer materials and cross application of electrocatalysis, and specifically relates to a Pd nanoparticle-supported nickel-iron double hydroxide nanosheet array structure material, a preparation method and an application thereof. Background technique [0002] Water electrolysis to generate hydrogen and oxygen offers an environmentally friendly and sustainable approach for energy storage and conversion. The water splitting reaction consists of two half-reactions: the anodic oxygen evolution reaction (OER) and the cathodic hydrogen evolution reaction (HER). The advancement of this technology requires the preparation of highly active and stable electrocatalysts to accelerate the catalytic kinetics of OER and HER. It is well known that Pt-based catalysts are recognized as advanced HER catalyst materials, and RuO 2 and IrO 2 It is an advanced OER catalyst, but the high cost and poor stabilit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J37/08C25B1/04C25B11/06
CPCB01J23/892B01J35/0033B01J35/023B01J37/08C25B1/04Y02E60/36
Inventor 吴正翠张君良高峰
Owner ANHUI NORMAL UNIV
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