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Core-shell structural anode catalyst for direct borohydride fuel cells and preparation method thereof

A core-shell structure, borohydride technology, used in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, battery electrodes, etc. It can improve the utilization rate, high activity and less hydrogen evolution.

Inactive Publication Date: 2012-03-21
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the invention is to provide a high-performance core-shell structure M for direct borohydride fuel cells core -Au shell The nanocomposite particle anode electrocatalyst and its preparation method solve the problems of low anode activity, severe hydrogen desorption from water, and low fuel utilization rate in existing direct methanol fuel cells

Method used

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  • Core-shell structural anode catalyst for direct borohydride fuel cells and preparation method thereof
  • Core-shell structural anode catalyst for direct borohydride fuel cells and preparation method thereof
  • Core-shell structural anode catalyst for direct borohydride fuel cells and preparation method thereof

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Embodiment 1

[0032] (1) Preparation of Cu nanoparticles: Cu(NO 3 )·3H 2 O and polyvinylpyrrolidone (PVP) were sequentially added to 20 ml of ethylene glycol, so that the concentration of Cu atoms in ethylene glycol was 20 mmol / L, and polyvinylpyrrolidone (PVP) in ethylene glycol The concentration is 3 g / L. Stir and pass nitrogen gas for 25 minutes to make it fully mixed, then heat to 60°C, continue to pass nitrogen gas and stir continuously, and the dropwise concentration is 0.3 mol L -1 Hydrazine hydrate solution, the molar amount of hydrazine hydrate added is twice that of Cu element, and the dropping rate is 40 drops·min -1 , reacted for 40 min to prepare Cu nano catalyst sol, then suction filtered and washed with distilled water to obtain Cu nanoparticles;

[0033] (2) Re-dissolve the Cu nanoparticles in the above (1) in 20 ml of ethylene glycol, add polyvinylpyrrolidone (PVP) under stirring to make the concentration 3 g / L, blow in nitrogen and stir For 30 minutes, add a tetrahydro...

Embodiment 2

[0036] (1) Preparation of Ni nanoparticles: NiCl 2 ·6H 2 O and tetraoctylammonium bromide were added to 20ml of water in turn, so that the concentration of Ni atoms in the water was 10 mmol / L, and the concentration of tetraoctylammonium bromide in water was 1.5 g / L. Stir and pass nitrogen gas for 20 minutes to make it fully mixed, then heat to 50°C, continue to pass nitrogen gas and stir constantly, the dropwise concentration is 0.3 mol L -1 Lithium triethyl borohydride solution, adding lithium triethyl borohydride molar weight is 1.5 times that of Ni element, and the dropping speed is 40 drops min -1 , and reacted for 40 min to prepare Ni nano catalyst sol, then suction filter and wash with distilled water to obtain Ni nanoparticles;

[0037] (2) Re-dissolve the M nanoparticles in the above (1) in 20 ml of water, add tetraoctyl ammonium bromide under stirring, the concentration of tetraoctyl ammonium bromide is 1.5g / L, blow in nitrogen and stir for 30 Minutes, then add a t...

Embodiment 3

[0040] (1) Preparation of Pt nanoparticles: H 2 PtCl 6 ·6H 2 O and polyethylene glycol were sequentially added to 20 ml of tetrahydrofuran, so that the concentration of Pt atoms in tetrahydrofuran was 30 mmol / L, and the concentration of polyethylene glycol in tetrahydrofuran was 5 g / L. Stir and pass nitrogen gas for 30 minutes to make it fully mixed, then heat to 80°C, continue to pass nitrogen gas and stir constantly, the dropwise concentration is 0.3 mol L -1 Sodium borohydride solution, the molar weight of sodium borohydride added is 2.5 times that of Pt element, and the dropping rate is 40 drops·min -1 , reacted for 60 min, prepared Pt nano catalyst sol, then suction filtered, and washed with distilled water to obtain Pt nanoparticles;

[0041] (2) Redissolve the Pt nanoparticles in the above (1) in 20ml tetrahydrofuran, add polyethylene glycol under stirring, the concentration of polyethylene glycol is 5g / L, blow in nitrogen and stir for 30 minutes, and then , the mol...

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Abstract

Disclosed are a core-shell structural anode catalyst for direct borohydride fuel cells and a preparation method thereof. The catalyst comprises Mcore-Aushell nano composite particles which utilize M as the core and utilizes Au as the shell, and the particle size of the Mcore-Aushell particles ranges from 10nm to 50nm. The preparation method includes steps: firstly, adding M-salt and a stabilizingagent into a solvent sequentially, introducing nitrogen gas into the solvent and then stirring and heating the solvent, introducing and stirring nitrogen gas again, dropping a reducing agent to realize reaction and obtain M-nano catalyst sol, and then obtaining M-nano particles after filtering and washing; secondly, dissolving the M-nano particles into solvent, adding stabilizing agent and introducing nitrogen gas into the solvent along with stirring, adding chloroauric acid-tetrahydrofuran solution, introducing nitrogen gas again, dropping reducing agent to realize reaction and prepare nano-catalyst sol, separating and washing the nano-catalyst sol, drying the nano-catalyst sol in vacuum, and finally preparing powdered Mcore-Aushell nano-particle catalyst by means of grinding. The core-shell structural anode catalyst for direct borohydride fuel cells has higher BH4 (tetrahydrobiopterin)-oxidation activity and is low in hydrogen evolution, and accordingly fuel utilization rate is improved.

Description

technical field [0001] The invention relates to an electrocatalyst for a direct borohydride fuel cell, specifically a core-shell structure nanocomposite particle used as an anode material for a direct borohydride fuel cell, belonging to the fields of electrocatalysis technology and energy technology. Background technique [0002] Direct borohydride fuel cell (Direct Borohydride Fuel Cell, DBFC) is a kind of using liquid alkali metal borohydride ABH 4 (A=Na, Li or K) is a power generation device fueled. Since alkali metal borohydride is a hydrogen-containing and stable hydride-containing anion substance, its hydrogen storage capacity is similar to that of methanol, but it is "cleaner" than methanol because it does not contain carbon elements; sodium borohydride liquid fuel The volumetric energy density (about 3000Ah / L) is greater than that of liquid hydrogen (about 2000Ah / L), while its gravimetric energy density (about 5Ah / g) is much higher than that of metal hydrides (about...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J23/52H01M4/90
CPCY02E60/50
Inventor 段东红武爱莲刘世斌卫国强张忠林
Owner TAIYUAN UNIV OF TECH
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