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A zirconium phosphate-based proton conductor material and its application in fuel cells

A proton conductor, zirconium phosphate-based technology, applied in fuel cells, circuits, electrical components, etc., can solve the problems of material corrosion, acid molecule leaching, etc., and achieve low cost, mild reaction conditions, good thermal stability and solution stability sexual effect

Active Publication Date: 2020-06-16
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former is limited by chemical reduction and dehydration, while the latter presents hazards of acid molecule leaching and material corrosion when in contact with water

Method used

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  • A zirconium phosphate-based proton conductor material and its application in fuel cells
  • A zirconium phosphate-based proton conductor material and its application in fuel cells
  • A zirconium phosphate-based proton conductor material and its application in fuel cells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] H 3 PO 4 , ZrCl 4 , (NH 2 ) 2 CO and [BMMim]Cl were placed in a 10mL polytetrafluoroethylene reactor at a molar ratio of 2.04:0.64:2.5:1.33, sealed, heated to 180°C, heated for 12 hours, and then cooled to room temperature at 6°C / h, the product Washing alternately with a large amount of boiling water and ethanol until the impurities are completely removed, washing the obtained crystal product with ethanol, and drying at room temperature to obtain an inorganic ZrP material.

[0037] The structure of ZrP was determined by single crystal X-ray diffraction, and its structural information is summarized in Table 1.

[0038] Table 1 Structural information of ZrP

[0039]

[0040] figure 1 (a) is a schematic diagram of the one-dimensional chain structure of the ZrP crystal structure, figure 1 Middle (b) is a schematic diagram of the intrinsic proton hydrogen transfer along the c-axis inside the ZrP crystal structure. The ZrP structure of the present invention consist...

Embodiment 2

[0043] Preparation and Testing of Inorganic Zirconium Phosphate Crystalline Material (ZrP) Proton Conducting Sheet

[0044] The ZrP crystal prepared in Example 1 was ground into a powder form with an agate mortar, and the powder was pressed into a proton conductive sheet with a diameter of 3 mm and a thickness ranging from 1 to 2 mm with a tablet press under a pressure of 1000 kg. The pressed proton conductive sheet was connected with a Solartron SI 1260 impedance / gain-phase analyzer with silver paste and gold wires for AC impedance measurement, with an AC voltage amplitude of 500mV and a frequency range of 5MHz to 1Hz. Under the test condition below 100°C, place the sample to be tested in a constant temperature-humidity box for AC impedance spectroscopy test; under the test condition above 100°C, place the sample to be tested in a tube furnace carry out testing. Proton conductivity was calculated by the following formula:

[0045] σ=L / RS

[0046] where S and L are the cros...

Embodiment 3

[0052] Preparation and Testing of Inorganic Zirconium Phosphate Crystalline Material (ZrP) Proton Exchange Membrane Fuel Cell (PEMFC)

[0053] Inorganic zirconium phosphate (ZrP) proton conduction membrane was prepared by hot pressing process. The ZrP crystalline material powder synthesized in Example 1 was physically mixed with 10 wt% polyvinylidene fluoride (PVDF) binder, and the PVDF was used to increase the density and strength of the zirconium phosphate battery sheet. The mixture was then hot-pressed at 180 °C for 0.5 h at 300 MPa. The obtained zirconium phosphate proton conducting membrane had a diameter of about 19 mm and a thickness of about 0.3 mm. A Pt / C anode, a zirconium phosphate proton-conducting membrane, and a Pt / C cathode constituted a single cell for electrochemical evaluation. Pt loading is 1.0mg / cm 2 Pt / C catalysts are used for the anode and cathode. Catalyst inks were prepared by mixing Pt / C powder with PTFE solution (3.1 wt% N,N-dimethylformamide) und...

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Abstract

The invention relates to a method for preparing a zirconium phosphate matrix sub-conductor material, comprising the steps of: using an alkylpyridine or an alkyl imidazole ionic liquid as a solvent, and performing ion thermal reaction on the phosphoric acid, zirconium source and urea in the solvent at 120-200 degrees centigrade; cooling the reaction solution to crystallize the product, thereby obtaining the zirconium phosphate matrix sub-conductor material after washing. The invention also claims to protect the zirconium phosphate matrix sub-conductor material prepared by the method and the application thereof in a proton exchange membrane fuel cell. The zirconium phosphate matrix sub-conductor material provided by the invention is in a dimensional crystal structure and forms a dimensionalspiral hydrogen bond chain, thereby having a high proton conduction rate under the conditions of low temperature and high humidity as well as high temperature and no humidity, and having good heat stability and solution stability. The zirconium phosphate matrix sub-conductor material is applied to PEMFC, so that the battery has a high electrical power density.

Description

technical field [0001] The invention relates to the fields of crystal preparation and battery materials, in particular to a zirconium phosphate-based proton conductor material and its application in fuel cells. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a kind of fuel cell, which has the advantages of low operating temperature, fast start-up, high specific power, simple structure, convenient operation, and environmental protection. Its single cell is composed of anode, cathode and proton exchange membrane, and the proton exchange membrane is used to transport H + media, only H + pass while H 2 The lost electrons pass through the wire. In principle, it is equivalent to the "reverse" device of water electrolysis. Taking a hydrogen fuel cell as an example, the electrode reaction is as follows: [0003] Negative pole: H 2 +2OH - →2H 2 O+2e - [0004] Positive electrode: 1 / 2O 2 +H 2 O+2e - →2OH - [0005] Battery response: H 2 +1 / 2...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/1004H01M8/1016
CPCH01M8/1004H01M8/1016Y02E60/50
Inventor 王殳凹桂大祥
Owner SUZHOU UNIV
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