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A kind of cobalt phosphonate and its preparation method and its application as a wide temperature range proton conducting material

A technology of cobalt phosphonate and hydrothermal reaction, applied in the preparation of cobalt phosphonate, the application of cobalt phosphonate as a proton conduction material in a wide working temperature range, in the field of proton conduction materials, can solve the problem of not fully understanding the conductivity and other problems, to achieve the effect of good coordination mode, low cost, excellent water stability and thermal stability

Active Publication Date: 2020-09-01
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A kind of cobalt phosphonate and its preparation method and its application as a wide temperature range proton conducting material
  • A kind of cobalt phosphonate and its preparation method and its application as a wide temperature range proton conducting material
  • A kind of cobalt phosphonate and its preparation method and its application as a wide temperature range proton conducting material

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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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Patent Type & Authority Patents(China)
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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