Preparation method for N-C-doped TiO<2> nanofiber loaded Pd@Ni positive electrode catalyst for direct methanol fuel cell

A methanol fuel cell and nanofiber technology, which is applied in fuel cells, battery electrodes, nanotechnology for materials and surface science, etc., can solve the problems that the utilization rate is not yet commercialized, the price is expensive, etc., and achieve improvement Effect of CO poisoning resistance, cost reduction, and high catalytic oxidation performance

Active Publication Date: 2016-08-10
NANTONG WUJING HIGH PRESSURE PUMP
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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 anode catalysts 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 present, but due to its high price, the utilization rate in DMFC is not yet commercialized

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of N,C doped TiO 2 A method for preparing a nanofiber-loaded Pd@Ni direct methanol fuel cell anode catalyst, comprising the following steps:

[0026] (1) N, C doped 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 A 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 the electrospinning device, and the voltage is adjusted to 25 KV, and the spinneret The distance to the tin foil is 15 cm, spray sol 2ml per hour to get PVP / TiO 2 fiber. PVP / TiO 2 The fibers were placed in a tubular heating furnace and calcined in an air atmosphere at 300 °C for 2 h, N 2 Under protection, calcined at 700 ℃ for 1 h to prepare N,C doped TiO 2 Nanofibers;

[0027] (2) TiO doped with N and C...

Embodiment 2

[0042] 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 The mixture of deionized water forms a uniform and transparent sol before electrospinning; step (5) according to the final synthesized catalyst W(Pd@Ni)=4%, molar ratio n(Pd):n(Ni)=1: 2 ratio to measure PdCl 2 / deionized water and NiSO 4 / deionized aqueous solution; all the other are with embodiment 1. The resulting catalyst consists of highly conductive N,C doped TiO 2 Nanofibers composed of nano-Pd@Ni with core-shell structure, N,C doped TiO 2 The mass content of nanofibers is 96%, the mass content of nano-Pd@Ni is 4%, and the ratio of n(Pd):n(Ni) is 1:1.

Embodiment 3

[0044] 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 is used to form a uniform and transparent sol before electrospinning; step (5) is based on the final synthesized catalyst W(Pd@Ni)=5%, molar ratio n(Pd):n(Ni)=1: 2 ratio to measure PdCl 2 / deionized water and NiSO 4 / deionized aqueous solution; all the other are with embodiment 1. The resulting catalyst consists of highly conductive N,C doped TiO 2 Nanofibers composed of nano-Pd@Ni with core-shell structure, N,C doped TiO 2 The mass content of nanofibers is 95%, the mass content of nano-Pd@Ni is 5%, and the ratio of n(Pd):n(Ni) is 1:1.

[0045] Other examples:

[0046] 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 aci...

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PUM

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Abstract

The invention discloses a preparation method for an N-C-doped TiO<2> nanofiber loaded Pd@Ni positive electrode catalyst for a direct methanol fuel cell. The catalyst comprises the high-conductivity N-C-doped TiO<2> nanofiber and nanometer Pd@Ni with a core-shell structure, wherein the mass content of the N-C-doped TiO<2> nanofiber is 95-97%; the mass content of the nanometer Pd@Ni is 3-5%; and the ratio of n(Pd) to n(Ni) is 1:1. The catalyst provided by the invention has relatively high catalytic oxidation performance; the intermediate products of CO and the like generated by methanol oxidization are absorbed and moved to the surface of the composite catalyst, and are directly and deeply oxidized into a final product-CO<2>; the costs of Ni and Pd are far below than that of noble metals, such as Pt, Ru and the like, and the dosages of Ni and Pd are relatively low in the catalyst; and therefore, the cost of the catalyst is greatly lowered, the catalytic performance and the CO poisoning resistance of the catalyst are greatly improved.

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 anode 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 anode catalysts 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 presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92
CPCB82Y30/00B82Y40/00H01M4/88H01M4/925H01M4/926H01M8/1011Y02E60/50
Inventor 鞠剑峰吴锦明石玉军薛如意蒋建婷王蔚张文静徐娴
Owner NANTONG WUJING HIGH PRESSURE PUMP
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