Preparation of Ru / p-moo3-p-moo2-p-fe3o4 heterostructure nanobelt and electrocatalytic application thereof
By preparing Ru/P-MoO3-P-MoO2-P-Fe3O4 heterostructure nanoribbons, the problem of insufficient catalytic activity of MoO3 was solved, and a highly efficient water electrolysis reaction was achieved with a current density of 10 mA/cm2.
Patent Information
- Application Number
- CN202211152063.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-09-21
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2042-09-21
AI Technical Summary
In the current technology for hydrogen production by water electrolysis, the catalytic activity and stability of MoO3 are insufficient, making it difficult to achieve an efficient water electrolysis reaction.
By loading Ru and doping P, Ru/P-MoO3-P-MoO2-P-Fe3O4 heterostructure nanoribbons were constructed to enhance the conductivity and active site exposure of the catalyst and optimize the electronic structure to improve the efficiency of water electrolysis.
It achieves efficient catalytic water splitting under low voltage, with a current density of 10 mA/cm2, thus improving the electrolysis performance of the catalyst.
Smart Images
Figure HDA0003856828310000011
Abstract
Description
Technical Field
[0001] This invention relates to the preparation and electrocatalytic application of Ru / P-MoO3-P-MoO2-P-Fe3O4 heterostructure nanoribbons, belonging to the field of materials preparation and application. Background Technology
[0002] Currently, water electrolysis for hydrogen production is an important pathway to obtain hydrogen energy, and attention has been focused on Fe-based and Mo-based oxides. MoO3 possesses a unique physical structure; its layered nanostructure determines its conductivity and catalytic water electrolysis activity. By supporting Ru and doping P, Ru / P-MoO3-P-MoO2-P-Fe3O4 heterostructure nanoribbons were constructed to achieve highly efficient catalytic water splitting.
[0003] By doping with heteroatoms, surface heterostructures are constructed to increase their specific surface area, expose more active sites, and enhance charge transport between heterostructure interfaces to improve the conductivity of the catalyst. For example, Cen et al. synthesized Ru-MoO3-x NF using a one-step hydrothermal method, achieving hydrogen splitting in water at low voltage (Renewable Energy, 2021; 177:1346-55). Wei et al. prepared a composite electrocatalyst ZIF67@MoO3 NSs@NF, which is composed of ZIF67 nanocrystals coated on a nickel foam substrate and grown as MoO3 nanosheets, and achieved good overall water electrolysis reaction activity at low voltage (International Journal of Hydrogen Energy, 2022; 47(16):9606-15). Li et al. synthesized Ni(PO3)2-MoO3 nanorods via hydrothermal synthesis and phosphating, and immobilized them on nickel foam (Ni(PO3)2-MoO3 / NF), achieving water electrolysis at room temperature and low voltage (Nanoscale. 2018; 10(47):22173-9). In summary, heteroatom doping and the construction of heterojunctions can effectively improve the water electrolysis activity of MoO3, which is of significant research value for preparing highly active and stable water electrolysis catalysts.
[0004] Hydrogen is considered one of the most ideal clean and green energy sources of the 21st century, and electrocatalytic water splitting is the most ideal method for hydrogen production. Therefore, optimizing the electronic structure of active sites by doping with heteroatoms such as P, and constructing a Ru / P-MoO3-P-MoO2-P-Fe3O4 interface structure to achieve a highly efficient water electrolysis reaction is of significant practical importance. Summary of the Invention:
[0005] The present invention aims to provide the application of the preparation of Ru / P-MoO3-P-MoO2-P-Fe3O4 heterostructure nanoribbons in electrocatalytic water splitting reaction.
[0006] Based on the above objectives, the technical solution involved in this invention is as follows:
[0007] (1) Preparation of Ru / P-MoO3-P-MoO2-P-Fe3O4 heterostructured nanoribbons: 1-2g of commercial α-MoO3 powder was dissolved in 11-15mL of H2O2, and the reaction was carried out at 170-220℃ for 12-24h using a hydrothermal synthesis method to obtain α-MoO3 nanoribbons with a width of 100-350nm and a length of 400-6000nm; then, a mixture of 15-30mg of α-MoO3 nanoribbons and 80-120mg of FeCl3·6H2O was ground evenly, and 1-20mg of RuCl3 was added, and then placed in a porcelain boat; 1-2g of RuCl3 was taken. NaH2PO2·H2O was placed in another porcelain boat, and both boats were placed in a tube furnace, with the boat containing NaH2PO2·H2O positioned upstream. The furnace was heated at 300-400℃ for 1-4 hours in a N2 atmosphere to obtain Ru / P-MoO3-P-MoO2-P-Fe3O4 heterostructure nanoribbons with a width of 100-300 nm and a length of 310-6100 nm. In the above preparation method, the Ru / P-MoO3-P-MoO2-P-Fe3O4 heterostructure nanoribbons form a heterostructure with P-doped MoO3, P-doped MoO2, and P-doped Fe3O4. The MoO3 crystal phase is attributed to standard card JCPDS#05-0508, the MoO2 crystal phase to standard card JCPDS#32-0671, and the Fe3O4 crystal phase to standard card JCPDS#19-0629.
[0008] (2) Application of Ru / P-MoO3-P-MoO2-P-Fe3O4 heterostructure nanoribbons prepared by the above method in electrocatalytic water splitting reaction; the electrocatalytic water splitting reaction has a current density of 10 mA / cm at a voltage of 1.6-1.7 V. 2 .
[0009] The present invention has the following advantages:
[0010] 1) Using α-MoO3, FeCl3·6H2O, and RuCl3 as precursors, Ru / P-MoO3-P-MoO2-P-Fe3O4 heterostructure nanoribbons were prepared by phosphating process, and a new synthetic route for Ru / P-MoO3-P-MoO2-P-Fe3O4 heterostructure nanoribbons was developed.
[0011] 2) Ru / P-MoO3-P-MoO2-P-Fe3O4 heterostructure nanoribbons exhibit good performance in electrocatalytic water splitting reaction.
[0012] 3) The present invention has the advantages of being simple and easy to operate. Attached image description:
[0013] Figure 1 The results are XRD characterizations of Ru / P-MoO3-P-MoO2-P-Fe3O4 heterostructure nanoribbons. Detailed Implementation
[0014] The following examples are used to further illustrate the present invention, but are not intended to limit the invention.
[0015] Example 1
[0016] Preparation and electrocatalytic application of Ru / P-MoO3-P-MoO2-P-Fe3O4 heterostructured nanoribbons: 1g of α-MoO3 powder was dissolved in 11mL of H2O2 solution, and the reaction was carried out at 170℃ for 12h using a hydrothermal synthesis method. The product was centrifuged and dried to obtain α-MoO3 nanoribbons with a width of 100-350nm and a length of 400-6000nm. Then, a mixture of 15mg of α-MoO3 nanoribbons and 80mg of FeCl3·6H2O was ground evenly and placed in a porcelain boat. 1g of... NaH₂PO₂·H₂O was placed in another ceramic boat, and both boats were placed in a tube furnace, with the boat containing NaH₂PO₂·H₂O positioned upstream. The furnace was heated at 300℃ for 1 hour in a N₂ atmosphere to obtain Ru / P-MoO₃-P-MoO₂-P-Fe₃O₄ heterostructure nanoribbons with a length of 310-6100 nm and a diameter of 100-300 nm. These Ru / P-MoO₃-P-MoO₂-P-Fe₃O₄ heterostructure nanoribbons were then applied in an electrocatalytic water splitting reaction. The electrocatalytic water splitting reaction showed a current density of 10 mA / cm² at a voltage of 1.6 V. 2 .
[0017] Example 2
[0018] Preparation and electrocatalytic application of Ru / P-MoO3-P-MoO2-P-Fe3O4 heterostructured nanoribbons: 2g of α-MoO3 powder was dissolved in 15mL of H2O2 solution, and the reaction was carried out at 220℃ for 24h using a hydrothermal synthesis method. The product was centrifuged and dried to obtain α-MoO3 nanoribbons with a width of 120-330nm and a length of 420-5800nm. Then, a mixture of 30mg of α-MoO3 nanoribbons and 120mg of FeCl3·6H2O was ground evenly and placed in a porcelain boat. 2g of the mixture was then taken... NaH₂PO₂·H₂O was placed in another ceramic boat, and both boats were placed in a tube furnace, with the boat containing NaH₂PO₂·H₂O positioned upstream. The furnace was heated at 400℃ for 4 hours in a N₂ atmosphere to obtain Ru / P-MoO₃-P-MoO₂-P-Fe₃O₄ heterostructure nanoribbons with a diameter of 120-280 nm and a length of 320-6000 nm. These Ru / P-MoO₃-P-MoO₂-P-Fe₃O₄ heterostructure nanoribbons were then applied in an electrocatalytic water splitting reaction. The electrocatalytic water splitting reaction showed a current density of 10 mA / cm² at a voltage of 1.7 V. 2 .
[0019] Example 3
[0020] Preparation and electrocatalytic application of Ru / P-MoO3-P-MoO2-P-Fe3O4 heterostructured nanoribbons: 1.4 g of α-MoO3 powder was dissolved in 12 mL of H2O2 solution, and the reaction was carried out at 190 °C for 18 h using a hydrothermal synthesis method. The product was centrifuged and dried to obtain α-MoO3 nanoribbons with a width of 110-330 nm and a length of 420-6000 nm. Then, a mixture of 25 mg of α-MoO3 nanoribbons and 100 mg of FeCl3·6H2O was ground evenly and placed in a porcelain boat. 1.5 g of the mixture was then taken... NaH₂PO₂·H₂O was placed in another ceramic boat, and both boats were placed in a tube furnace, with the boat containing NaH₂PO₂·H₂O positioned upstream. The furnace was heated at 350℃ for 4 hours in a N₂ atmosphere to obtain Ru / P-MoO₃-P-MoO₂-P-Fe₃O₄ heterostructure nanoribbons with a diameter of 120-300 nm and a length of 360-6100 nm. These Ru / P-MoO₃-P-MoO₂-P-Fe₃O₄ heterostructure nanoribbons were then applied in an electrocatalytic water splitting reaction. The electrocatalytic water splitting reaction showed a current density of 10 mA / cm² at a voltage of 1.63 V. 2 .
Claims
1. A method for preparing Ru / P-MoO3-P-MoO2-P-Fe3O4 heterostructure nanoribbons, characterized in that, Includes the following steps: 1-2 g of commercial α-MoO3 powder was dissolved in 11-15 mL of H2O2 and reacted at 170-220 °C for 12-24 h using a hydrothermal synthesis method to obtain α-MoO3 nanoribbons with a width of 100-350 nm and a length of 400-6000 nm. Then, a mixture of 15-30 mg of α-MoO3 nanoribbons and 80-120 g of FeCl3·6H2O was ground until homogeneous, and 1-20 mg of RuCl3 was added before placing it in a porcelain boat. 1-2 g of NaH2PO2·H2O was placed in another porcelain boat. The two boats were placed in a tube furnace, with the boat containing NaH2PO2·H2O positioned upstream. The furnace was heated in a N2 atmosphere at 300-400 °C. Heating at ℃ for 1-4 hours yields Ru / P-MoO3-P-MoO2-P-Fe3O4 heterostructure nanoribbons; the width of the Ru / P-MoO3-P-MoO2-P-Fe3O4 heterostructure nanoribbons is 100-300 nm and the length is 310-6100 nm; in the Ru / P-MoO3-P-MoO2-P-Fe3O4 heterostructure nanoribbons, P-doped MoO3, P-doped MoO2, and P-doped Fe3O4 form a heterostructure, the MoO3 crystal phase is attributed to standard card JCPDS#05-0508, the MoO2 crystal phase is attributed to standard card JCPDS#32-0671, and the Fe3O4 crystal phase is attributed to standard card JCPDS#19-0629.
2. The application of Ru / P-MoO3-P-MoO2-P-Fe3O4 heterostructure nanoribbons prepared by the method described in claim 1 in electrocatalytic water splitting; the electrocatalytic water splitting reaction has a current density of 10 mA / cm² at a voltage of 1.6-1.7 V. 2 .