Synthesis method of superfine ruthenium diphosphide nanoparticle electrocatalyst

A technology of fine ruthenium diphosphide and nanoparticles, applied in electrodes, electrolysis process, electrolysis components, etc., can solve the problem of reduction of catalytic active sites, and achieve the effect of reducing a large amount of release and excellent catalytic activity

Pending Publication Date: 2022-04-08
JIANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although Ru-based phosphides have remarkable HER activity, metal phosphides tend to agglomerate to form large nanoparticles during high-temperature phosphating preparation, resulting in a significant reduction in their catalytic active sites.
Synthesis of highly dispersed ultrafine Ru-based phosphide nanoparticles to expose abundant active sites remains a major challenge.

Method used

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  • Synthesis method of superfine ruthenium diphosphide nanoparticle electrocatalyst
  • Synthesis method of superfine ruthenium diphosphide nanoparticle electrocatalyst
  • Synthesis method of superfine ruthenium diphosphide nanoparticle electrocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 RuP 2 Preparation of @NPS-CNT catalyst

[0032] 100 mg of carbon nanotubes (outer diameter: 15 nm, length: 50 μm) and ruthenium trichloride RuCl 3 (0.2 mmol) was added into 80 mL ultra-dry methanol, ultrasonicated for 1 h, and made into A solution. Dissolve 300 mg of hexachlorotripolyphosphazene and 675 mg of 4,4'-dihydroxydiphenylsulfone in 20 mL of ultra-dry methanol to form solution B, add the obtained solution of B to the above 80 mL of LA solution, and stir at room temperature for 10 After min, make C solution. Then, 1 mL of triethylamine was added dropwise to the above solution C, and after stirring at room temperature for 24 h, it was filtered with organic polymer membrane, washed three times with ordinary methanol, and then dried naturally to obtain the Ru-PZS@CNT precursor. Subsequently, the obtained Ru-PZS@CNT precursor powder was placed in a porcelain boat and placed in a tube furnace. The tube furnace was heated to 800°C under Ar flow at a ramp...

Embodiment 2

[0033] Example 2 RuP obtained in Example 1 2 Electrocatalytic HER activity test of @NPS-CNT

[0034] The RuP of embodiment 1 gained 2 The electrocatalytic HER performance test of @NPS-CNT was carried out on a CHI760E electrochemical workstation. The electrolyte is 1.0 M KOH aqueous solution. Glassy carbon electrode, Ag / AgCl and graphite rod were used as working electrode, reference electrode and counter electrode, respectively. Figure 6 The linear sweep voltammetry graph shown was obtained at a sweep rate of 5.0 mV / s, obtained by Figure 6 It can be seen that RuP 2 @NPS-CNT drives 10, 100 and 300 mA cm -2 The required overpotentials for the current densities are 10, 83, and 158 mV, respectively, and the catalytic activity is significantly better than that of commercial Pt / C. Figure 7 The Tafel plot shown is from Figure 6 Calculated, it can be known that RuP 2 @NPS-CNT has a Tafel slope of 22 mV dec -1, much lower than commercial Pt / C.

Embodiment 3

[0035] Example 3 RuP obtained in Example 1 2 Electrochemical stability test of @NPS-CNT

[0036] Figure 8 The potentiostatic electrolysis diagram shown is for controlling the RuP 2 @NPS-CNT was obtained by electrolysis for 25 h at overpotentials of 10, 83 and 158 mV, from which it can be seen that the RuP 2 @NPS-CNT maintains good catalytic stability at different current densities. Figure 9 RuP shown 2 @NPS-CNT The linear sweep voltammetry curve before and after 10,000 CV scans, the two lines basically overlap, indicating RuP 2 The @NPS-CNT catalyst has good catalytic stability.

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Abstract

The invention discloses a preparation method of a superfine ruthenium diphosphide (RuP2) nanoparticle electrocatalyst and application of the superfine ruthenium diphosphide (RuP2) nanoparticle electrocatalyst in hydrogen evolution reaction (HER). According to the invention, highly dispersed ultrafine RuP2 nanoparticles (RuP2 at NPS-CNT) embedded in an N, P and S co-doped carbon nanotube are prepared through a coordination confinement strategy. The RuP2-coated NPS-CNT catalyst shows excellent HER electro-catalytic performance, and the current density of 10 mA cm <-2 >, 100 mA cm <-2 > and 300 mA cm <-2 > can be driven only by overpotentials of 10 mV, 83 mV and 158 mV in 1.0 M KOH. And the Tafel slope is only 22 mV decade <-1 >. The catalytic activity of the RuP2-coated NPS-CNT is superior to that of a commercial Pt / C catalyst, and the RuP2-coated NPS-CNT has the advantages of low preparation cost, wide raw material source and potential commercial value.

Description

technical field [0001] The invention relates to the field of inorganic synthesis and the field of energy catalysis, in particular to ultrafine ruthenium diphosphide (RuP 2 ) controlled synthesis of nanoparticles and their application as electrocatalysts for the hydrogen evolution reaction. Background technique [0002] The increasingly depleted fossil fuels and severe environmental problems have prompted people to seek sustainable and clean energy. Hydrogen (H 2 ) not only has high energy density, but also has no pollution in its combustion products, making it an ideal substitute for fossil fuels. Water electrolysis is considered to be one of the most promising ways to harvest hydrogen energy on a large scale. In order to efficiently produce H 2 , it is crucial to develop highly active and stable hydrogen evolution reaction (HER) electrocatalysts. Currently, Pt-based materials are considered as the most advanced HER electrocatalysts. However, high cost and rarity have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/091C25B1/04
Inventor 何纯挺曹黎明朱轩逸黄慧彬章佳
Owner JIANGXI NORMAL UNIV
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