Preparation method of multistage porous Rh nanosheet

A technology of nanosheets and hydroxyethylidene diphosphonic acid, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of slow methanol oxidation reaction at the anode and hinder the commercialization of ADMFCs

Active Publication Date: 2020-01-10
SHAANXI NORMAL UNIV
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  • Abstract
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Problems solved by technology

However, the sluggish methanol oxidation reaction a

Method used

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  • Preparation method of multistage porous Rh nanosheet
  • Preparation method of multistage porous Rh nanosheet
  • Preparation method of multistage porous Rh nanosheet

Examples

Experimental program
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Example Embodiment

[0020] Example 1

[0021] Add 1mL of 0.08mol / L RhCl 3 Aqueous solution, 1mL 0.5mol / L hydroxyethylidene diphosphonic acid aqueous solution, 8mL deionized water are mixed uniformly, the resulting mixture is allowed to stand for 1~2min to make Rh 3+ Complex with hydroxyethylidene diphosphonic acid to form HEDP-Rh 3+ Complex; then add 25mL ethanol, and add 2mL2mol / L NaOH aqueous solution to adjust the pH to 12-14, so that HEDP-Rh 3+ The complex is precipitated; finally, 5 mL (0.09 mol) of ethylene glycol is added, and the reaction is reduced at 160° C. for 3 hours in the reactor, centrifuged, washed, and vacuum dried to obtain the product. by figure 1 It can be seen that the product obtained is Rh. by figure 2 It can be seen that the obtained product has a two-dimensional porous sheet structure. by image 3 On closer inspection, we can see that Rh nanosheets are assembled from two-dimensional Rh nanocrystals, with rough and porous surfaces.

Example Embodiment

[0022] Example 2

[0023] Add 1mL of 0.08mol / L RhCl 3 The aqueous solution, 0.5mL 0.5mol / L hydroxyethylidene diphosphonic acid aqueous solution and 8.5mL deionized water are mixed uniformly, and the resulting mixture is allowed to stand for 1~2min to make Rh 3+ Complex with hydroxyethylidene diphosphonic acid to form HEDP-Rh 3+ Complex; then add 15mL ethanol, and add 2mL2mol / L NaOH aqueous solution to adjust the pH to 12-14, so that HEDP-Rh 3+ The complex is precipitated; finally, 10mL (0.18mol) of ethylene glycol is added, and the reaction is reduced at 150℃ in the reactor for 5 hours, centrifuged, washed, and vacuum dried to obtain multi-stage porous Rh nanosheets (see Figure 4 ).

Example Embodiment

[0024] Example 3

[0025] Add 1mL of 0.08mol / L RhCl 3 The aqueous solution, 1.5mL 0.5mol / L hydroxyethylidene diphosphonic acid aqueous solution and 7.5mL deionized water are mixed uniformly, and the resulting mixture is allowed to stand for 1~2min to make Rh 3+ Complex with hydroxyethylidene diphosphonic acid to form HEDP-Rh 3+ Complex; then add 30mL ethanol, and add 2mL2mol / L NaOH aqueous solution to adjust the pH to 12-14, so that HEDP-Rh 3+ The complex is precipitated; finally 4mL (0.07mol) ethylene glycol is added, and the reaction is reduced at 170°C in the reactor for 3 hours, centrifuged, washed, and vacuum dried to obtain multi-stage porous Rh nanosheets (see Figure 5 ).

[0026] In order to prove the beneficial effects of the present invention, the inventors used the multi-stage porous Rh nanosheets (referred to as Rh nanosheets) prepared in Example 1 to electrocatalyze the oxidation reaction of methanol at 30°C, and the cyclic voltammetry test was used. Image 6 . by Im...

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Abstract

The invention discloses a preparation method of a multistage porous Rh nanosheet. The method takes 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP) as a complexing agent, water and ethyl alcohol as solvents and ethylene glycol as a reducing agent, and reduces Rh<3+> into the multistage porous Rh nanosheet through hydrothermal reaction by adopting a simple HEDP-mediated wet chemistry method. The preparation method is environmentally friendly, simple, economical and suitable for industrial large-scale production. The Rh nanosheet prepared by the method has an ultrathin structure, rich pores (edge atoms) and grain boundary atoms, shows rich active centers, has high methanol adsorption energy and low reaction barrier, can be used as a catalyst for methanol electrooxidation reaction, and is a fuel cell catalyst with a great development prospect.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a method for preparing a multi-level porous Rh nanosheet. The Rh nanosheet is used as a catalyst and exhibits relatively high catalytic activity in catalyzing methanol electrooxidation. Background technique [0002] Typical two-dimensional nanomaterials have a sheet structure, such as transition metal dichalcogenides, layered metal oxides, layered double hydroxides and their derivatives. Due to their large specific surface area, atomic-scale thickness, confined carrier transport, and high flexibility, 2D nanomaterials have attracted extensive attention, especially in emerging energy-related electrocatalysis. For example, transition metal 2D nanomaterials have shown outstanding performance in water splitting research, and their electrocatalytic activity is comparable to that of noble metal catalysts in the hydrogen / oxygen evolution reaction. Nevertheless,...

Claims

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Application Information

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IPC IPC(8): H01M4/90B82Y30/00
CPCH01M4/9041B82Y30/00Y02E60/50
Inventor 陈煜朱婧怡
Owner SHAANXI NORMAL UNIV
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