CN102936738A - Low-temperature cobalt electrodeposition method utilizing ionic liquid - Google Patents
Low-temperature cobalt electrodeposition method utilizing ionic liquid Download PDFInfo
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- CN102936738A CN102936738A CN2012104094244A CN201210409424A CN102936738A CN 102936738 A CN102936738 A CN 102936738A CN 2012104094244 A CN2012104094244 A CN 2012104094244A CN 201210409424 A CN201210409424 A CN 201210409424A CN 102936738 A CN102936738 A CN 102936738A
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Abstract
The invention relates to a low-temperature cobalt electrodeposition method utilizing ionic liquid. The method is characterized in comprising the steps that: anhydrous cobalt chloride CoCl2 is adopted as a raw material; ionic liquid is adopted as an electrolyte; cobalt chloride is completely dissolved in the ionic liquid; electrodeposition is carried out by using a direct current power supply; during electrodeposition, tank voltage of an electrolytic cell is higher than a cobalt chloride decomposition voltage and is lower than an ionic liquid electrochemical window, such that cobalt is produced on a cathode, and chlorine gas is emitted from an anion. The invention provides a low-temperature metal cobalt electrodeposition method utilizing ionic liquid. The low-temperature cobalt electrodeposition method utilizing ionic liquid provided by the invention aims at solving the problems such as high energy consumption, non-environment-friendliness, equipment corrosion, high cost, and environment pollution of current industrial cobalt electrodeposition productions. The method comprises the advantages of low operation temperature, low energy consumption, small corrosion to environment, and greatly reduced production cost.
Description
Technical field
The present invention relates to a kind of method of utilizing ionic liquid low temp. electric deposit cobalt.
Background technology
Ionic liquid is that a kind of room temperature that is made of ion is fully melted salt, usually is comprised of the asymmetric organic cation of geometry and inorganic or organic anion.Ionic liquid has the characteristics such as chemical heat stability is high, not flammable, steam forces down, specific conductivity is high, toxicity is little, electrochemical window is wide.Ionic liquid at room temperature can obtain the metal that the ability galvanic deposit obtains in high-temperature molten salt, but does not have again the such severe corrosive of high-temperature molten salt.
Summary of the invention
The purpose of this invention is to provide a kind of method of utilizing ionic liquid low temp. electric deposit cobalt, the method service temperature is low, less energy consumption, little to equipment corrosion, production cost is low.
A kind of method of utilizing ionic liquid low temp. electric deposit cobalt, its special feature are, comprise the steps: with waterless cobaltous chloride CoCl
2Be raw material, take ionic liquid as ionogen, be dissolved in cobalt chloride in the ionic liquid fully first, adopt again direct supply to carry out galvanic deposit, the groove of electrolyzer is pressed the electrochemical window that is higher than the cobalt chloride decomposition voltage and is lower than ionic liquid during galvanic deposit, thereby produce cobalt at negative electrode, emit chlorine on the anode.
Wherein ionic liquid electrolyte be by with alkyl imidazole salt, Fixanol, alkyl pyrroles salt, alkyl quaternary ammonium salts, alkyl quaternary phosphonium salt, fluoro-alkyl imidazole salts, fluoro-alkyl pyridinium salt, fluoro-alkyl pyrroles salt, fluoro-alkyl quaternary ammonium salt, fluoro-alkyl season phosphonium salt as positively charged ion, and with Cl
-, AlCl
4 -, BF
4 -, PF
6 -, NO
3 -, N (CF
3SO
2)
-, CF
3SO
3 -A kind of pure ionic liquid or two kinds and two or more mixed ionic liquids as the negatively charged ion composition.
Wherein adopt the dc electrodeposition mode, take the cobalt plate as anode, solid copper is negative electrode, and cathode current density is controlled at 5～100A/m
2, bath voltage 1.0～2V, pole span 15～40mm, electrolysis temperature are controlled at 25～150 ℃.
Wherein electrolyzer inner cathode and anode are arranged vertically, and electrode surface is parallel to each other, and are provided with at least one group of electrode that--the moon--positive mode is arranged with sun in electrolyzer.
The invention provides a kind of method of utilizing ionic liquid low temp. electric deposition to produce cobalt metal.The method is with cobalt chloride CoCl
2Be raw material, with CoCl
2Be dissolved in the ionic liquid, be mixed with ionic liquid-CoCl
2Electrolytic solution carries out galvanic deposit.In the electrodeposition process, bath voltage will be higher than the decomposition voltage of cobalt chloride, and is lower than the electrochemical window of ionic liquid, produces cobalt on the negative electrode, emits chlorine on the anode.The ionic liquid quality is light, nontoxic, non-volatility, without flammable, electroconductibility is good, thermostability is high, fusing point is low, boiling point is high, electrochemical window is wide, can slow down the corrosion to electrode materials and slot liner, and reusable edible.The present invention is directed to present industrial electro deposition and produce some problems that cobalt exists, the problems such as such as high energy consumption,, etching apparatus unfriendly to environment, cost is large, contaminate environment propose a kind of ionic liquid that utilizes and carry out galvanic deposit production cobalt.The method service temperature is low, less energy consumption, little to equipment corrosion, will greatly reduce production costs.
Embodiment
The present invention is a kind of method of utilizing ionic liquid low temp. electric deposition to produce cobalt metal, and the method is with cobalt chloride CoCl
2Be raw material, with CoCl
2Be dissolved in the ionic liquid, gained solution is that electrolytic solution carries out dc electrodeposition.Groove is pressed and is higher than the decomposition voltage of cobalt chloride, and is lower than the electrochemical window of ionic liquid.Produce cobalt on the negative electrode, emit chlorine on the anode.The selected ionic liquid of method is mainly considered two problems, the one, cobalt chloride there is good solubility, and the 2nd, have wider electrochemical window and higher specific conductivity.The positively charged ion of common ion liquid has the positively charged ions such as alkyl imidazole salt, Fixanol, alkyl pyrroles salt, alkyl quaternary ammonium salts, alkyl quaternary phosphonium salt, can also carry out the fluoro processing to it in order to improve its electrochemical stability.Negatively charged ion commonly used also has BF except chlorion
4 -, PF
6 -, NO
3 -, AlCl
4 -, CF
3SO
3 -, N (CF
3SO
2)
2 -Deng negatively charged ion.The ionic liquid that adopts in addition can be a kind of pure ionic liquid, also can be two or more mixed ionic liquids.
Embodiment 1:
Take by weighing a certain amount of [Emim] Cl, slowly adding mol ratio is the aluminum chloride AlCl of 1:2 (mol ratio of [Emim] Cl and aluminum chloride is 1:2)
3, after aluminium to be chlorinated fully dissolved, adding an amount of cobalt chloride, to make the mol ratio of [Emim] Cl and cobalt chloride be 50:1 again, 60 ℃ of heating of constant temperature oil bath, again take two parallel high-purity cobalt plates as anode, the centre is solid copper sheet negative electrode, pole span (referring between cobalt anode and the cathode) 15mm is at 50A/m
2Current density under constant-current electrolysis 0.5h, anode produces chlorine, separates out the solid cobalt on the negative electrode.
Embodiment 2:
Take by weighing a certain amount of [Bmim] Cl, slowly adding mol ratio is the aluminum chloride AlCl of 1:2
3, after it fully dissolved, adding an amount of cobalt chloride, to make the mol ratio of [Bmim] Cl and cobalt chloride be 50:1,60 ℃ of heating of constant temperature oil bath, and again take two parallel high-purity cobalt plates as anode, the centre is solid copper sheet negative electrode, pole span 15mm is at 60A/m
2Current density under constant-current electrolysis 0.5h, anode produces chlorine, separates out the solid cobalt on the negative electrode.
Claims (4)
1. a method of utilizing ionic liquid low temp. electric deposit cobalt is characterized in that, comprises the steps: with waterless cobaltous chloride CoCl
2Be raw material, take ionic liquid as ionogen, be dissolved in cobalt chloride in the ionic liquid fully first, adopt again direct supply to carry out galvanic deposit, the groove of electrolyzer is pressed the electrochemical window that is higher than the cobalt chloride decomposition voltage and is lower than ionic liquid during galvanic deposit, thereby produce cobalt at negative electrode, emit chlorine on the anode.
2. a kind of method of utilizing ionic liquid low temp. electric deposit cobalt as claimed in claim 1, it is characterized in that: wherein ionic liquid electrolyte be by with alkyl imidazole salt, Fixanol, alkyl pyrroles salt, alkyl quaternary ammonium salts, alkyl quaternary phosphonium salt, fluoro-alkyl imidazole salts, fluoro-alkyl pyridinium salt, fluoro-alkyl pyrroles salt, fluoro-alkyl quaternary ammonium salt, fluoro-alkyl season phosphonium salt as positively charged ion, and with Cl
-, AlCl
4 -, BF
4 -, PF
6 -, NO
3 -, N (CF
3SO
2)
-, CF
3SO
3 -A kind of pure ionic liquid or two kinds and two or more mixed ionic liquids as the negatively charged ion composition.
3. a kind of method of utilizing ionic liquid low temp. electric deposit cobalt as claimed in claim 1, it is characterized in that: wherein adopt the dc electrodeposition mode, take the cobalt plate as anode, solid copper is negative electrode, and cathode current density is controlled at 5～100A/m
2, bath voltage 1.0～2V, pole span 15～40mm, electrolysis temperature are controlled at 25～150 ℃.
4. a kind of method of utilizing ionic liquid low temp. electric deposit cobalt as claimed in claim 1, it is characterized in that: wherein electrolyzer inner cathode and anode are arranged vertically, electrode surface is parallel to each other, and is provided with at least one group of electrode that--the moon--positive mode is arranged with sun in electrolyzer.
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| CN2012104094244A CN102936738A (en) | 2012-10-24 | 2012-10-24 | Low-temperature cobalt electrodeposition method utilizing ionic liquid |
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| CN2012104094244A CN102936738A (en) | 2012-10-24 | 2012-10-24 | Low-temperature cobalt electrodeposition method utilizing ionic liquid |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110468433A (en) * | 2019-09-02 | 2019-11-19 | 江西理工大学 | A kind of method that Low-temperature electro-deposition prepares Sm-Co alloy firm |
| CN112176372A (en) * | 2020-09-27 | 2021-01-05 | 东北大学 | Method for preparing cobalt-tantalum alloy coating at low temperature by taking cobalt dichloride and tantalum pentachloride as raw materials |
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2012
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110468433A (en) * | 2019-09-02 | 2019-11-19 | 江西理工大学 | A kind of method that Low-temperature electro-deposition prepares Sm-Co alloy firm |
| CN110468433B (en) * | 2019-09-02 | 2021-08-20 | 江西理工大学 | Method for preparing Sm-Co alloy film by low-temperature electrodeposition |
| CN112176372A (en) * | 2020-09-27 | 2021-01-05 | 东北大学 | Method for preparing cobalt-tantalum alloy coating at low temperature by taking cobalt dichloride and tantalum pentachloride as raw materials |
| CN112176372B (en) * | 2020-09-27 | 2021-10-15 | 东北大学 | Method for preparing cobalt-tantalum alloy coating at low temperature by taking cobalt dichloride and tantalum pentachloride as raw materials |
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Application publication date: 20130220 |