Highly-dispersed support core-shell structure Pd @ Ni/WC direct alcohol fuel cell catalyst and preparation method thereof

A core-shell structure, fuel cell technology, applied in the direction of fuel cells, battery electrodes, structural parts, etc., can solve the problems of anode catalysts restricting the industrialization process of direct alcohol fuel cells, limited cost reduction, and poor stability. Facilitate large-scale production, reduce usage and cost, and not easy to agglomerate

Active Publication Date: 2018-12-07
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, how to improve the activity and stability of the anode catalyst still directly restricts the industrialization process of direct alcohol fuel cells
Among many anode electrocatalysts, Pd / C catalyst is widely used, but its cost is high and its stability is poor.
Studies have found that the activity and stability of Pd catalysts can be improved by doping a second metal (Pd-M, M=Pt, Au, Ir, Sn, Bi, Co, Ni) or a non-metal (such as phosphorus), but the traditional simple mixing Doping has limited cost reduction
In addition, loading metal nanoparticles on some carriers with good conductivity and large specific surface area can also improve the utilization rate of the metal to a certain extent, inhibit the aggregation of nanoparticles and improve the activity and stability of the catalyst, but how to choose a suitable one? Carriers remain challenging

Method used

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  • Highly-dispersed support core-shell structure Pd @ Ni/WC direct alcohol fuel cell catalyst and preparation method thereof
  • Highly-dispersed support core-shell structure Pd @ Ni/WC direct alcohol fuel cell catalyst and preparation method thereof
  • Highly-dispersed support core-shell structure Pd @ Ni/WC direct alcohol fuel cell catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1: Pd 2 @Ni 1 / WC 1.31 -900℃-3h(Pd 2 @Ni refers to the molar ratio of Pd and Ni is 2:1, WC 1.31 Indicates tungsten carbide, the mass ratio of tungsten source and carbon source is 1:1.31, the calcination temperature is 900°C, and the calcination time is 3h)

[0042] Weigh 1g of ammonium metatungstate, dissolve 1.31g of glucose in deionized water at 80°C, adjust the pH to 11 with NaOH, add 2g of SiO 2 The sol (diameter 20nm, mass fraction 40%) was stirred at 80°C for 3h; dried at 120°C for 5h to obtain a precursor solid. The above precursor solids were placed in a tube furnace, N 2 Under atmosphere at 5°C min -1 The rate is programmed to 550°C, then at 2°C min -1 The rate was programmed to raise the temperature to 900°C, react at a constant temperature for 3 hours, and cool naturally to obtain a precursor composite material. Put the above precursor composite material in 2M NaOH solution, stir at 80°C for 12h, suction filter, wash, and vacuum dry at 80°C fo...

Embodiment 2

[0045] Example 2: Pd 3 @Ni 1 / WC 1.31 -900℃-3h(Pd 3 @Ni means the molar ratio of Pd and Ni is 3:1, WC 1.31 Indicates tungsten carbide, the mass ratio of tungsten source and carbon source is 1:1.31, the calcination temperature is 900°C, and the calcination time is 3h)

[0046] Weigh 1g of ammonium metatungstate, dissolve 1.31g of glucose in deionized water at 80°C, adjust the pH to 11 with NaOH, add 2g of SiO 2 The sol (diameter 20nm, mass fraction 40%) was stirred at 80°C for 3h; dried at 120°C for 5h to obtain a precursor solid. The above precursor solids were placed in a tube furnace, N 2 Under atmosphere at 5°C min -1 The rate is programmed to 550°C, then at 2°C min -1 The rate was programmed to raise the temperature to 900°C, react at a constant temperature for 3 hours, and cool naturally to obtain a precursor composite material. Put the above precursor composite material in 2M NaOH solution, stir at 80°C for 12h, suction filter, wash, and vacuum dry at 80°C for 6h...

Embodiment 3

[0049] Example 3: Pd 4 @Ni 1 / WC 1.31 -900℃-3h(Pd 4 @Ni means the molar ratio of Pd and Ni is 4:1, WC 1.31 Indicates tungsten carbide, the mass ratio of tungsten source and carbon source is 1:1.31, the calcination temperature is 900°C, and the calcination time is 3h)

[0050] Weigh 1g of ammonium metatungstate, dissolve 1.31g of glucose in deionized water at 80°C, adjust the pH to 11 with NaOH, add 2g of SiO 2 The sol (diameter 20nm, mass fraction 40%) was stirred at 80°C for 3h; dried at 120°C for 5h to obtain a precursor solid. The above precursor solids were placed in a tube furnace, N 2 Under atmosphere at 5°C min -1 The rate is programmed to 550°C, then at 2°C min -1 The rate was programmed to raise the temperature to 900°C, react at a constant temperature for 3 hours, and cool naturally to obtain a precursor composite material. Put the above precursor composite material in 2M NaOH solution, stir at 80°C for 12h, suction filter, wash, and vacuum dry at 80°C for 6h...

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Abstract

A highly dispersed supported core-shell structure Pd @ Ni / WC direct alcohol fuel cell catalyst and its preparation method belong to the field of energy materials and electrochemical technology. Firstly, porous WC support was prepared by calcination of SiO2 at high temperature. Ni / WC was prepared by chemical reduction using NiCl _ 2 -6 H _ 2O as Ni source. Finally, Ni atoms on Ni surface were substituted for Pd by substitution method, and the catalyst with Ni nanoparticles as core and Pd as shell was obtained. As that core-shell structure nanoparticle of the invention are uniformly dispersed onthe surface of the WC carry with high conductivity, the core-shell structure can improve the conduction of alcohols and electrons, and the bimetallic alloy has a synergistic structure and an electronic effect, and also can improve the catalytic performance; and the core-shell structure nanoparticles of the invention are uniformly dispersed on the surface of the WC carry with high conductivity. Asthat preparation process of the invention is simple, the raw material cost is low and the source is rich, the cost can be reduced, and the invention is favorable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of energy materials and electrochemistry, and relates to an anode electrocatalyst for a direct alcohol fuel cell, in particular to a Pd@Ni / WC catalyst with a core-shell structure and a preparation method thereof. Background technique [0002] Fuel cell is a high-efficiency and clean power generation device that directly converts the chemical energy of fuel into electrical energy. It is of great significance to solve the two major problems of "energy shortage" and "environmental pollution" facing the world today, and is considered to be the most important in the 21st century. One of the energy dynamics. Due to its high theoretical energy density, non-toxicity, cleanliness, convenient storage and transportation, and safety, fuel cells have attracted widespread attention in recent years and have very broad application prospects. [0003] Direct alcohol fuel cells use small molecule alcohols, such as CH 3 OH, ...

Claims

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Application Information

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IPC IPC(8): H01M4/92H01M8/1011B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/921H01M4/925H01M8/1011H01M8/1013Y02E60/50Y02P70/50
Inventor 李光兰徐晓存刘新红杨贝贝袁丽芳陈文雯
Owner DALIAN UNIV OF TECH
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