PdNi / TiO2 nanofiber anode catalyst for direct methanol fuel cell and preparation method thereof

A methanol fuel cell and nanofiber technology, applied in physical/chemical process catalysts, battery electrodes, metal/metal oxide/metal hydroxide catalysts, etc., can solve the requirements of high price and low utilization rate for commercialization and other issues to achieve the effect of reducing costs and improving the ability to resist CO poisoning

Inactive Publication Date: 2012-02-22
NANTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The noble metal Pt has excellent catalytic performance at low temperature (less than 80°C). At present, the electrocatalysts of DMFC all use Pt as the main component, and the PtRu catalyst has stronger CO...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A PdNi / TiO 2 The preparation method of nanofiber direct methanol fuel cell anode catalyst comprises the following steps:

[0022] (1) TiO 2 Preparation of nanofibers: using sol-gel method and electrospinning method: dissolve 2.2ml butyl titanate and 4 grams polyvinylpyrrolidone (PVP) in 22ml absolute ethanol, then add dropwise 22ml anhydrous The mixture of ethanol, 3.6ml glacial acetic acid, and 1.8ml deionized water forms a uniform and transparent sol and carries out electrospinning; during electrospinning, the sol is added to an electrospinning device, and the voltage adjustment is 30KV, and the spinneret reaches The distance of the tin foil is 20cm, spray sol 2ml per hour, and the obtained fiber is roasted in air at 500°C for 3 hours in a muffle furnace to obtain TiO 2 Nanofibers;

[0023] (2) TiO 2 Nanofibers are added to ethylene glycol at a ratio of 50~100mg / ml, and ultrasonically dispersed evenly to obtain TiO 2 nanofiber dispersion;

[0024] (3) PdCl 2 Di...

Embodiment 2

[0034] Step (1) When preparing the sol: dissolve 2.2ml of butyl titanate and 4 grams of polyvinylpyrrolidone (PVP) in 22ml of absolute ethanol, then add dropwise 22ml of absolute ethanol, 4.8ml of glacial acetic acid, 3.6ml of A mixture of deionized water, forming a uniform and transparent sol, and then performing electrospinning; step (5) according to the final synthesized catalyst W (PdNi) = 4%, molar ratio n (Pd): n (Ni) = 1:1 Proportional measurement of PdCl 2 / glycol solution and NiSO 4 / Ethylene glycol solution mixes; All the other are with embodiment 1. The resulting catalyst consists of TiO 2 Composition of nanofibers with nano-PdNi, TiO 2 The mass content of the nanofiber is 96%, and the mass content of the nano-PdNi is 4%.

Embodiment 3

[0036] Step (1) When preparing the sol: dissolve 2.2ml of butyl titanate and 4 grams of polyvinylpyrrolidone (PVP) in 22ml of absolute ethanol, then add dropwise 22ml of absolute ethanol, 7.2ml of glacial acetic acid, 4.8ml of A mixture of deionized water, forming a uniform and transparent sol, and then performing electrospinning; step (5) according to the final synthesized catalyst W (PdNi) = 5%, molar ratio n (Pd): n (Ni) = 1:1 Proportional measurement of PdCl 2 / glycol solution and NiSO 4 / Ethylene glycol solution mixes; All the other are with embodiment 1. The resulting catalyst consists of TiO 2 Composition of nanofibers with nano-PdNi, TiO 2 The mass content of the nanofiber is 95%, and the mass content of the nano-PdNi is 5%.

[0037] Other examples:

[0038] The molar ratio of each component used in the preparation of the above-mentioned sol is: n (butyl titanate): n (absolute ethanol): n (glacial acetic acid): n (deionized water): n (polyvinylpyrrolidone) = 1: 2...

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PUM

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Abstract

The invention discloses a PdNi / TiO2 nanofiber anode catalyst for a direct methanol fuel cell and a preparation method thereof. The catalyst comprises 95-97wt% of TiO2 nanofiber and 3-5% of nano PdNi. According to the invention, TiO2 nanofiber with high specific surface is used as a carrier to compound with PdNi to form a multicomponent catalyst; composite of Pd and Ni enhances conductive performance of TiO2 and catalysis performance of TiO2 on methanol; intermediates like CO generated from methanol oxidation are adsorbed and transferred to a catalyst surface and are directly treated with deep oxidation into an end-product of CO2. PdTi has a price much lower than those of precious metals like Pt and Ru, and also a small dosage in the catalyst, so as to substantially reduce catalyst costs and enhance catalyst capability of resisting CO poison.

Description

technical field [0001] The invention relates to a direct methanol fuel cell anode catalyst and a preparation method thereof. Background technique [0002] Direct methanol fuel cell (DMFC) has the advantages of low energy consumption, high energy density, abundant sources of methanol, low price, simple system, convenient operation and low noise, and is considered to be the most promising chemical power source for future automobile power and other vehicles , arousing widespread concern. One of the most critical materials of DMFC is the electrode catalyst, which directly affects the performance, stability, service life and manufacturing cost of the battery. The noble metal Pt has excellent catalytic performance at low temperature (less than 80°C). At present, the electrocatalysts of DMFC all use Pt as the main component, and the PtRu catalyst has stronger CO poisoning resistance and higher catalytic activity than pure Pt. It is considered to be the best catalyst for DMFC at p...

Claims

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Application Information

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IPC IPC(8): H01M4/92B01J23/89
CPCY02E60/50
Inventor 张跃华鞠剑峰缪勤华王南平商艳芳
Owner NANTONG UNIVERSITY
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