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Preparation method of Rh nanoflower electrocatalyst for alkaline direct methanol fuel cell

A methanol fuel cell and catalyst technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of dependence, achieve high active sites, excellent electrocatalytic activity, and suppress the effect of Ostwalder ripening effect

Inactive Publication Date: 2016-07-27
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this synthetic method relies on toxic organic solvents

Method used

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  • Preparation method of Rh nanoflower electrocatalyst for alkaline direct methanol fuel cell
  • Preparation method of Rh nanoflower electrocatalyst for alkaline direct methanol fuel cell
  • Preparation method of Rh nanoflower electrocatalyst for alkaline direct methanol fuel cell

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Effect test

Embodiment 1

[0021] 0.5mL0.1mol / L of RhCl 3 Aqueous solution, 0.5mL 0.5mol / L PEI aqueous solution with a number average molecular weight of 10000 was added to a 10mL beaker, mixed evenly, under stirring conditions, the resulting mixed solution was adjusted to pH 3 with 1mol / L HCl aqueous solution, and then 0.5mL (5.25mmol) diethylene glycol, where RhCl 3 The molar ratio with PEI and diethylene glycol is 1:5:105, and then transferred to the reaction kettle, and the reaction kettle was placed in an oven at 180°C for a closed reaction for 10 hours, cooled to room temperature, centrifuged, and washed with distilled water for 3~ 5 times, and dried in a vacuum oven at 60°C to obtain the Rh nanoflower electrocatalyst. Depend on figure 1 It can be seen that the four diffraction peaks are located at 41.068, 47.780, 69.877 and 84.393°, which are consistent with the standard card of the face-centered cubic (FCC) Rh crystal (JCPDS No. 05-0685) and no additional diffraction peaks are observed, indica...

Embodiment 2

[0024] 0.5mL0.1mol / L of RhCl 3 Aqueous solution, 0.5mL 0.5mol / L PEI aqueous solution with a number average molecular weight of 8000 was added to a 10mL beaker, mixed evenly, under stirring conditions, the resulting mixed solution was adjusted to pH 4 with 1mol / L aqueous HCl solution, and then 0.475mL was added (5mmol) diethylene glycol, where RhCl 3 The molar ratio of PEI and diethylene glycol is 1:5:100, and then transferred to the reactor, and the reactor was placed in an oven at 200°C for a closed reaction for 8 hours, cooled to room temperature, centrifuged, and washed with distilled water for 3~ 5 times, dried in a vacuum oven at 60°C to obtain the Rh nanoflower electrocatalyst (see Figure 7-8 ).

Embodiment 3

[0026] 0.5mL0.1mol / L of RhCl 3 Aqueous solution, 0.5mL 0.5mol / L PEI aqueous solution with a number average molecular weight of 12000 was added to a 10mL beaker, mixed evenly, under stirring conditions, the resulting mixed solution was adjusted to pH 2 with 1mol / L aqueous HCl solution, and then 0.525mL was added (5.5mmol) diethylene glycol, where RhCl 3 The molar ratio of PEI and diethylene glycol is 1:5:110, and then transferred to the reaction kettle, and the reaction kettle was placed in an oven at 160°C for a closed reaction for 12 hours, cooled to room temperature, centrifuged, and washed with distilled water for 3~ 5 times, dried in a vacuum oven at 60°C to obtain the Rh nanoflower electrocatalyst (see Figure 9-10 ).

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Abstract

The invention discloses a preparation method of a Rh nanoflower electrocatalyst for an alkaline direct methanol fuel cell, and belongs to the technical field of eletrocatalysis and energy source. According to the method, polyethyleneimine is taken as a complexing agent and a stabilizer, diethylene glycol is taken as a reducing agent, and RhC13 is reduced to Rh nanoflower with a highly branched structure at one step by a heating method in an aqueous solution. The Rh nanoflower prepared according to the method has a unique structure, high specific area and many active position points, methanol oxidation reaction is catalyzed in an alkaline medium, and the Rh nanoflower has high application prospect; moreover, the prepared Rh nanoflower can have a high electrochemical signal without being subjected to ultraviolet ozone processing, and can be taken as an anode catalyst of the direct methanol fuel cell; and the preparation method of the Rh nanoflower is simple and economic, and is suitable for industrial production at a large scale.

Description

technical field [0001] The invention belongs to the technical field of electrocatalysis and energy, and in particular relates to a preparation method of a Rh nano-flower electrocatalyst used in an alkaline direct methanol fuel cell. Background technique [0002] Alkaline direct methanol fuel cells have attracted considerable attention in recent years. As an ideal energy supply system for portable electronic devices, its unique advantages include: (i) in alkaline medium, the kinetics of methanol oxidation reaction is improved; (ii) in alkaline medium, the kinetics of oxygen reduction reaction improved kinetics; (iii) non-precious metal cathodic electrocatalysts (such as carbon materials and perovskite-type oxides) in alkaline media have been widely used; (iv) simple aqueous reaction systems. As an electrocatalyst to replace Pt, Pd nanocrystals have been widely used in alkaline direct methanol fuel cells. Studies have shown that Rh-based nanocrystal anode electrocatalysts ha...

Claims

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Application Information

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IPC IPC(8): H01M4/90
CPCH01M4/9008Y02E60/50
Inventor 陈煜康永强金普军
Owner SHAANXI NORMAL UNIV
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