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 electroc

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

Examples

Experimental program
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Example Embodiment

[0031] Example 1

[0032] (1) Preparation of Cu nanoparticles: Cu(NO 3 )·3H 2 O and polyvinyl pyrrolidone (PVP) were added to 20 ml of ethylene glycol in sequence to make the concentration of Cu atoms in ethylene glycol 20 mmol / L, and polyvinyl pyrrolidone (PVP) in ethylene glycol The concentration is 3 g / L. Stir and bubbling nitrogen for 25 min to make it fully mixed and uniform, then heat to 60℃, continue to bubbling nitrogen and stirring constantly, dropwise concentration is 0.3 mol·L -1 Hydrazine hydrate solution, the molar amount of hydrazine hydrate added is twice that of Cu, and the dropping rate is 40 drops·min -1 , Reacting for 40 min, prepare Cu nano-catalyst sol, then suction filter, wash with distilled water to obtain Cu nano-particles;

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

Example Embodiment

[0035] Example 2

[0036] (1) Preparation of Ni nanoparticles: NiCl 2 ·6H 2 O and tetraoctyl ammonium bromide were sequentially added to 20 ml of water, so that the concentration of Ni atoms in the water was 10 mmol / L, and the concentration of tetraoctyl ammonium bromide in the water was 1.5 g / L. Stir and bubbling with nitrogen for 20 minutes to make it evenly mixed, then heat to 50°C, continue to bubbling with nitrogen and stirring constantly, the concentration is 0.3 mol·L dropwise -1 Lithium triethylborohydride solution, the molar amount of lithium triethylborohydride added is 1.5 times that of Ni, and the dropping rate is 40 drops·min -1 , React for 40 min to prepare Ni nano-catalyst sol, then suction filter and wash with distilled water to obtain Ni nano-particles;

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

Example Embodiment

[0039] Example 3

[0040] (1) Preparation of Pt nanoparticles: H 2 PtCl 6 ·6H 2 O and polyethylene glycol were added to 20ml of tetrahydrofuran in sequence, 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 blow nitrogen for 30 minutes to make it fully mixed and uniform, then heat to 80°C, continue to blow nitrogen and stir constantly, dropwise concentration is 0.3 mol·L -1 Sodium borohydride solution, the molar amount of sodium borohydride added is 2.5 times that of Pt element, and the dropping rate is 40 drops·min -1 , React for 60 min, prepare Pt nano-catalyst sol, then suction filter, wash with distilled water to obtain Pt nano-particles;

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

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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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