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Cobalt phosphonate, preparation method thereof and application of cobalt phosphonate as proton conducting material in wide temperature range

A cobalt phosphonate, proton conduction technology, applied in chemical instruments and methods, fuel cells, cobalt organic compounds, etc., can solve problems such as insufficient understanding of electrical conductivity, achieve a good coordination mode, and be conducive to industrial production and operation. simple effect

Active Publication Date: 2019-10-08
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, complex proton-conducting materials with water molecules as the medium, such as [Li 3 (HPA)(H 2 O) 4 ]·H 2 O, Ca-PiPhtA-I, Zn(m-H 6 L) and La(H 5 DTMP)·7H 2 O and others mainly study proton conduction at room temperature, and cannot fully understand its conductivity at higher temperatures

Method used

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  • Cobalt phosphonate, preparation method thereof and application of cobalt phosphonate as proton conducting material in wide temperature range
  • Cobalt phosphonate, preparation method thereof and application of cobalt phosphonate as proton conducting material in wide temperature range
  • Cobalt phosphonate, preparation method thereof and application of cobalt phosphonate as proton conducting material in wide temperature range

Examples

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Embodiment 1

[0047] A kind of cobalt phosphonate, its preparation method comprises: with 0.72g H 6 bmt, 0.46g 4,4'-bipyridine and 0.6g Co(OAc) 2 4H 2 O was added to 30 mL of deionized water, stirred and 60 μL of 1 mol / L NaOH solution was added. Then place it in an autoclave at 100° C. for 48 hours at a constant temperature, and after cooling to room temperature, crystals are precipitated, and the crystals are washed with deionized water several times to obtain cobalt phosphonate. The cobalt phosphonate is a pink blocky crystal. Elemental analysis data C 48 h 78 co 2 N 6 o 32 P 6 , Theoretical: C, 37.08; H, 5.06; N, 5.41%. Found: C, 37.46; H, 5.42; N, 5.04%. Main infrared data (KBr, cm -1 ): 3379, 3098, 3056, 2911, 1611, 1521, 1453, 1237, 1151, 1020, 934.

[0048] Analyze the single crystal structure of the cobalt phosphonate prepared in Example 1 of the present invention, collect the single crystal diffraction data with a Bruker Smart CCD diffractometer, and use a graphite mono...

Embodiment 2

[0050] A kind of cobalt phosphonate, its preparation method comprises: with 0.72g H 6 bmt, 0.46g 4,4'-bipyridine and 0.6g Co(OAc) 2 4H 2 O was added to 30 mL of deionized water, stirred and 60 μL of 1 mol / L NaOH solution was added. Then place it in an autoclave at 140° C. for 72 hours at a constant temperature, and after cooling down to room temperature, crystals are precipitated, and the crystals are washed with deionized water several times to obtain cobalt phosphonate. The cobalt phosphonate is a pink blocky crystal.

[0051] The cobalt phosphonate prepared in Example 2 of the present invention was analyzed by X-ray diffraction, and its diffraction peaks were consistent with the simulated diffraction peaks obtained by single crystal analysis in Example 1 of the invention, illustrating the preparation according to Example 1 and Example 2 The method obtained is the same substance.

[0052] In order to investigate the proton conductivity of the cobalt phosphonate prepared ...

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Abstract

The invention discloses cobalt phosphonate, a preparation method thereof and an application of the cobalt phosphonate as a proton conducting material in a wide temperature range. The molecular expression of cobalt phosphonate is [Co(4,4'-bipy)(H2O)4]*[Co(4,4'-bipy)2(H3O)2(H2O)2]]*2H4bmt*6H2O, wherein H4bmt is a ligand (benzene-1,3,5-trimethyl(methylene))triphosphate(H6bmt) with two protons removed, and 4,4'-bipy is a 4,4'-bipyridine molecule. The preparation method of the cobalt phosphonate includes carrying out hydrothermal reaction on an aqueous solution containing H6bmt, 4,4'-bipyridine andCo(OAc)2*4H2O with a pH value of 2-9 to obtain the product. Cobalt phosphonate contains a large number of water molecules and phosphonic acid groups as well as abundant hydrogen bond networks, as a proton conducting material for water medium, cobalt phosphonate has excellent conductivity in a wide working temperature range of 287-373K, and moreover, cobalt phosphonate can maintain stable structure and very high conduction value even after being repeatedly used at 373K and 98% relative humidity (RH), so that the cobalt phosphonate is a potential proton conducting material.

Description

technical field [0001] The present invention relates to a proton conduction material, in particular to a metal ion with cobalt (II) as the center, 4,4'-bipyridine and [H 4 bmt] 2- The invention relates to a cobalt phosphonate (cobalt-phosphonic acid complex) composed of a ligand, and also relates to a preparation method of the cobalt phosphonate and the application of the cobalt phosphonate as a proton conduction material in a wide working temperature range, belonging to the technical field of fuel cells. Background technique [0002] Proton-conducting materials have attracted extensive attention due to their potential applications in electrochemical devices, sensors, and fuel cells. Currently, the commercialized perfluorosulfonic acid hydration membrane has a proton conductivity of 10 at 60-80°C and 98% RH. -2 ~10 -1 S cm -1 . However, the price of perfluorosulfonic acid is very high, and it is unstable when used above 100°C, which seriously affects the proton conducti...

Claims

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Application Information

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IPC IPC(8): C07F15/06H01M8/1016
CPCC07F15/065H01M8/1016Y02E60/50
Inventor 侯浩波冯露周旻董祎挈李嘉豪陈畅
Owner WUHAN UNIV
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