Heterogeneous catalyst, preparation method thereof and application of heterogeneous catalyst in hydrogen evolution by electrolyzing water

A heterogeneous catalyst, catalyst technology, applied in electrolysis components, electrolysis process, nanotechnology for materials and surface science, etc., can solve the problems of low cost performance and high price of precious metal catalysts, achieve performance improvement, excellent electrocatalytic performance, The effect of improving conductivity

Pending Publication Date: 2022-07-15
NINGBO FENGCHENG ADVANCED ENERGY MATERIALS RES INST CO LTD
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Problems solved by technology

Among them, the mainstream is noble metal catalysts, such as Pt/C c...
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Abstract

The invention discloses a heterogeneous catalyst, a preparation method of the heterogeneous catalyst and application of the heterogeneous catalyst in hydrogen evolution by electrolyzing water. The heterogeneous catalyst comprises a carrier and an active component, the carrier is MXene; the active component comprises nickel phosphide and molybdenum diselenide; the active component has a heterostructure; the heterostructure comprises a Ni2P nanosheet and a MoSe2 nanosheet, wherein the Ni2P nanosheet and the MoSe2 nanosheet are formed on an MXene substrate. The Ni2P-coated MoSe2/MXene composite material disclosed by the invention has a heterostructure and a nanosheet array structure, and the structure has a rich structural network, greatly exposes active sites and shows excellent electro-catalytic performance.

Application Domain

Material nanotechnologyElectrodes

Technology Topic

ChemistryHydrogen evolution +9

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  • Heterogeneous catalyst, preparation method thereof and application of heterogeneous catalyst in hydrogen evolution by electrolyzing water
  • Heterogeneous catalyst, preparation method thereof and application of heterogeneous catalyst in hydrogen evolution by electrolyzing water
  • Heterogeneous catalyst, preparation method thereof and application of heterogeneous catalyst in hydrogen evolution by electrolyzing water

Examples

  • Experimental program(4)
  • Comparison scheme(2)
  • Effect test(1)

Example Embodiment

[0070] Preparation Example 1 Carrier MXene (Ti 3 C 2 ) preparation
[0071] By etching Ti 3 AlC 2 Powder synthesis of MXene. First, 1 g of LiF was dissolved in 20 ml of HCl (9 mol/L), and then the solution was thoroughly mixed to obtain an etching solution. Next, 1 g of Ti 3 AlC 2 Slowly added to the etching solution and magnetically stirred at 35°C for 24h to obtain a solid. The resulting solid residue was then washed with deionized water and centrifuged at 3500 rpm until pH reached 6. The resulting precipitated product was dispersed in 150 ml of deionized water and then sonicated for 1 h in flowing argon. A few-layer MXene dispersion was obtained by collecting the supernatant after centrifugation at 3500 rpm for 1 hour.

Example Embodiment

[0072] Example 1
[0073] (1) Ni 2 Preparation of precursors of P/MXene:
[0074] Ni was prepared by hydrothermal method 2 Precursor of P/MXene. 0.5816g Ni (NO 3 ) 2 ·6H 2 O (2 mmol), 0.6 g urea (10 mmol) and 0.222 g NH 4 F (6 mmol) was dissolved in 30 mL of deionized water and stirred for 20 min to form a homogeneous solution. Then, the MXene dispersion liquid obtained in Preparation Example 1 was placed in the above solution, and oxygen was excluded with argon gas, and transferred to a stainless steel autoclave together, and placed in an oven at 120° C. for 6 hours. After cooling to room temperature, washing with deionized water, and then drying in an oven at 60 °C for 6 h, the precursor I was obtained. Precursor I and 2.0 g NaH 2 PO 2 Put them on two porcelain boats, respectively placed downstream and upstream of the tube furnace, heated to 300 °C at a rate of 5 °C/min, and kept for 2 h for phosphating treatment. Finally, Ni was obtained after cooling to room temperature 2 P/MXene precursor;
[0075] (2) Ni 2 P@MoSe 2 /MXene
[0076] 0.3g CH 4 N 2 Se and 0.3g H 8 MoN 2 O 4 Add 30 mL of deionized water and stir for 20 min to obtain a homogeneous solution I. Then the Ni prepared in step (1) was 2 The P/MXene precursor and solution I were transferred into a stainless steel reactor and reacted at 210 °C for 12 h. After naturally cooling to room temperature, washed with deionized water, and finally dried at 60 °C for 6 h to obtain the product Ni 2 P@MoSe 2 /MXene (sample 1 # ).

Example Embodiment

[0077] Example 2
[0078] (1) Ni 2 Preparation of precursors of P/MXene:
[0079] Ni was prepared by hydrothermal method 2 Precursor of P/MXene. 0.5816g Ni (NO 3 ) 2 ·6H 2 O (2 mmol), 0.6 g urea (10 mmol) and 0.222 g NH 4 F (6 mmol) was dissolved in 30 mL of deionized water and stirred for 20 min to form a homogeneous solution. Then, the MXene dispersion liquid obtained in Preparation Example 1 was placed in the above solution, and oxygen was excluded with argon gas, and transferred to a stainless steel autoclave together, and placed in an oven at 120° C. for 6 hours. After cooling to room temperature, washing with deionized water, and then drying in an oven at 60 °C for 6 h, the precursor I was obtained. Precursor I and 2.5 g NaH 2 PO 2 Put them on two porcelain boats, respectively placed downstream and upstream of the tube furnace, heated to 350 °C at a rate of 5 °C/min, and kept for 2 hours for phosphating treatment. Finally, Ni was obtained after cooling to room temperature 2 P/MXene precursor;
[0080] (2) Ni 2 P@MoSe 2 /MXene
[0081] 0.3g CH 4 N 2 Se and 0.3g H 8 MoN 2 O 4 Add 30 mL of deionized water and stir for 20 min to obtain a homogeneous solution I. Then the Ni prepared in step (1) was 2 The P/MXene precursor and solution I were transferred into a stainless steel reactor and reacted at 210 °C for 12 h. After naturally cooling to room temperature, washed with deionized water, and finally dried at 60 °C for 6 h to obtain the product Ni 2 P@MoSe 2 /MXene (sample 2 # ).

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