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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the sluggish methanol oxidation reaction at the anode hinders the commercialization of ADMFCs

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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Embodiment 1

[0021] 1mL0.08mol / L of RhCl 3 aqueous solution, 1 mL of 0.5 mol / L aqueous solution of hydroxyethylidene diphosphonic acid, and 8 mL of deionized water were mixed evenly, and the resulting mixture was allowed to stand for 1 to 2 minutes to allow Rh 3+ Complexation with hydroxyethylidene diphosphonic acid to form HEDP-Rh 3+ complex; then add 25mL of ethanol, and add 2mL of 2mol / L NaOH aqueous solution to adjust the pH to 12-14, so that HEDP-Rh 3+ The complex compound was precipitated; finally, 5 mL (0.09 mol) of ethylene glycol was added, and the reduction reaction was carried out at 160° C. in the reaction kettle for 3 hours, centrifuged, washed, and vacuum-dried to obtain the product. Depend on figure 1 It can be seen that the obtained product is Rh. Depend on figure 2 It can be seen that the obtained product is a two-dimensional porous sheet structure. pass image 3 On closer inspection, we can see that Rh nanosheets are assembled from two-dimensional Rh nanocrystals w...

Embodiment 2

[0023] 1mL0.08mol / L of RhCl 3 aqueous solution, 0.5mL of 0.5mol / L hydroxyethylidene diphosphonic acid aqueous solution, and 8.5mL of deionized water were mixed evenly, and the resulting mixture was allowed to stand for 1 to 2 minutes to allow the Rh 3+ Complexation with hydroxyethylidene diphosphonic acid to form HEDP-Rh 3+ complex; then add 15mL ethanol, and add 2mL 2mol / L NaOH aqueous solution to adjust the pH to 12-14, so that HEDP-Rh 3+ The complex compound was precipitated; finally, 10mL (0.18mol) ethylene glycol was added, and the reduction reaction was carried out at 150°C in the reaction kettle for 5 hours, centrifuged, washed, and vacuum-dried to obtain multi-level porous Rh nanosheets (see Figure 4 ).

Embodiment 3

[0025] 1mL0.08mol / L of RhCl 3 aqueous solution, 1.5 mL of 0.5 mol / L aqueous solution of hydroxyethylidene diphosphonic acid, and 7.5 mL of deionized water were mixed evenly, and the resulting mixture was allowed to stand for 1 to 2 minutes to allow Rh 3+ Complexation with hydroxyethylidene diphosphonic acid to form HEDP-Rh 3+ complex; then add 30mL ethanol, and add 2mL 2mol / L NaOH aqueous solution to adjust the pH to 12-14, so that HEDP-Rh 3+ The complex compound was precipitated; finally, 4 mL (0.07 mol) of ethylene glycol was added, and the reduction reaction was carried out at 170 °C in the reactor for 3 hours, centrifuged, washed, and vacuum-dried to obtain multi-level porous Rh nanosheets (see Figure 5 ).

[0026] In order to prove the beneficial effects of the present invention, the inventors used the multi-level porous Rh nanosheets prepared in Example 1 (abbreviated as Rh nanosheets) to electrocatalyze the methanol oxidation oxidation reaction at 30 ° C, and adopted...

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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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