CN106011924A - Lanthanum-containing electrolysis electrode and preparation method thereof - Google Patents
Lanthanum-containing electrolysis electrode and preparation method thereof Download PDFInfo
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- CN106011924A CN106011924A CN201610525386.7A CN201610525386A CN106011924A CN 106011924 A CN106011924 A CN 106011924A CN 201610525386 A CN201610525386 A CN 201610525386A CN 106011924 A CN106011924 A CN 106011924A
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- C23C20/00—Chemical coating by decomposition of either solid compounds or suspensions of the coating forming compounds, without leaving reaction products of surface material in the coating
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- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
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- C25B11/055—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the substrate or carrier material
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- C25B11/051—Electrodes formed of electrocatalysts on a substrate or carrier
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- C25B11/091—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material consisting of at least one catalytic element and at least one catalytic compound; consisting of two or more catalytic elements or catalytic compounds
- C25B11/093—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material consisting of at least one catalytic element and at least one catalytic compound; consisting of two or more catalytic elements or catalytic compounds at least one noble metal or noble metal oxide and at least one non-noble metal oxide
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- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/12—Electroplating: Baths therefor from solutions of nickel or cobalt
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- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/50—Electroplating: Baths therefor from solutions of platinum group metals
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention discloses a lanthanum-containing electrolysis electrode and a preparation method thereof. The preparation method comprises the following steps that a stainless steel substrate material is ground, subjected to oil removal, etched in an acid solution and activated so that a pre-treated substrate material is obtained; a titanium dioxide coating is formed on the pre-treated substrate material, so that the electrolysis electrode containing the titanium dioxide coating is obtained; and the electrolysis electrode containing the titanium dioxide coating serves as a cathode, a platinum net serves as an anode, a solution containing lanthanum compounds and platinum compounds serves as electroplate liquid, a lanthanum-containing platinum clad layer is formed on the electrolysis electrode containing the titanium dioxide coating, so that the lanthanum-containing electrolysis electrode is obtained. According to the lanthanum-containing electrolysis electrode and the preparation method thereof, the stainless steel substrate material low in price is adopted, and the titanium dioxide coating and the lanthanum-containing platinum clad layer are formed on the stainless steel substrate material, so that the use stability of the electrolysis electrode is guaranteed.
Description
Technical field
The present invention relates to a kind of electrode for electrolysis and preparation method thereof, especially can apply to be electrolysed the electrolysis electricity consumption of water
Pole and preparation method thereof.
Background technology
Electrolytic water generating device can generate electrolysis water, mainly includes alkaline water, slightly acidic water, strong oxidized water etc..Electrode
Being all the nucleus equipment of electrolytic water generating device with separation film, there is close relationship with the quality of electrolysis water in them.In order to carry
The service life of high electrolytic water generating device, and avoid water pollution, generally use platinum Ti electrode as electrolytic water generating device
Anode.But, platinum Ti electrode is expensive, and this causes the production cost of electrolytic water generating device to remain high, and seriously restricts
Its popularization and application.
Based on this, some research worker begin look for the succedaneum of platinum Ti electrode.Such as, Application No.
The Chinese patent application of 201120553451.X discloses a kind of device for tap water electrolytic separation, by ion exchange membrane,
Ti-alloy anode, stainless steel cathode, tank house, upper end cover, bottom end cover constitute, ion exchange membrane be arranged on Ti-alloy anode with not
Between rust steel negative electrode, Ti-alloy anode is arranged on the side of tank house, and stainless steel cathode is arranged on the opposite side of tank house, electrolysis
Room is fixed between upper end cover and bottom end cover.This patent documentation has ruthenium iridium metals layer in the surface burn-back of Ti-alloy anode, replaces
On Ti-alloy anode, the platinum of plating, has saved cost, but its price is the highest.And for example, Application No.
The Chinese patent application of 201410818169.8 discloses a kind of electrode for electrolysis, this electrode for electrolysis include conductive substrate and
Active coating, described conductive substrate is the base material comprising titanium or titanium alloy, described active coating including at least primer coating and
Face coat, described primer coating comprises titanium oxide, iridium oxide and ru oxide, and described face coat comprises iridium oxidation
The metal of one or both elements in thing, ru oxide, titanium oxide and palladium, platinum or oxide.The electricity of this patent documentation
Solution electrode have employed duplex coating, compares the signal layer coating comprising only ruthenium, iridium, titanium, and its electrode activity is more preferable, and the analysis of electrode
Chloride potential is low, and oxygen evolution potential is high, and the service life of electrode is longer, and electrolysis stability is more preferable.But, this patent documentation still makes
With titanium or titanium alloy as base material, the cost causing electrode is the highest.
Therefore, at present in the urgent need to a kind of electrode for electrolysis, its production cost is relatively low, and stability in use is preferable.
Summary of the invention
An object of the present invention is to provide the preparation method of a kind of electrode for electrolysis containing lanthanum, and it can be processed and obtain
Cost is relatively low, the preferable electrode for electrolysis of stability in use.
Further object is that a kind of electrode for electrolysis containing lanthanum of offer, it can reduce production cost, and
And stability in use is good.
Inventors herein have recognized that following technical scheme can realize above-mentioned purpose.
The present invention provides the preparation method of a kind of electrode for electrolysis containing lanthanum, and described preparation method comprises the steps:
(1) pre-treatment step of stainless steel substrate:
Being polished by stainless steel substrate, carry out oil removing, etch activation obtains pretreating substrates the most in an acidic solution；
(2) forming step of coating of titanium dioxide:
Described pretreating substrates is formed coating of titanium dioxide, thus obtains the electrolysis electricity consumption containing coating of titanium dioxide
Pole；
(3) forming step of the platinum coating containing lanthanum:
Be anode using the described electrode for electrolysis containing coating of titanium dioxide as negative electrode, platinum guaze, with comprise lanthanum compound and
The solution of platinum compounds is electroplate liquid, forms the platinum coating containing lanthanum on the described electrode for electrolysis containing coating of titanium dioxide, from
And obtain the electrode for electrolysis containing lanthanum.
According to preparation method of the present invention, it is preferable that in step (1), stainless steel substrate is used 80～110 mesh
Sand papering, will polishing after stainless steel substrate at 30～45 DEG C with alkaline degreaser soak carry out oil removing, then in acid
Property solution in etch activation within 60～80 seconds, obtain pretreating substrates.
According to preparation method of the present invention, it is preferable that in step (1), described alkaline degreaser be containing 10～
35g/L tertiary sodium phosphate and the aqueous solution of 5～13g/L sodium silicate；Described acid solution include 10～20wt% nitric acid, 30～
40wt% hydrochloric acid and 45～55wt% water.
According to preparation method of the present invention, it is preferable that in step (2), described pretreating substrates is placed in hexafluoro
In the mixed solution that titanium acid ammonium and boric acid are formed, take out after soaking 10～50 hours at 35～55 DEG C and dry, then in inertia
Heat treatment 50～80 minutes under gas shield, at 500～700 DEG C, obtain the electrolysis containing coating of titanium dioxide after natural cooling
Use electrode.
According to preparation method of the present invention, it is preferable that in step (2), the hexafluorotitanic acid in described mixed solution
Ammonium concentration is 0.2～0.35mol/L and boric acid concentration is 0.2～0.35mol/L.
According to preparation method of the present invention, it is preferable that described lanthanum compound is selected from Lanthanum (III) nitrate or lanthanum chloride；Described
Platinum compounds is selected from dinitroso two ammino platinum or chloroplatinic acid.
According to preparation method of the present invention, it is preferable that in step (3), described electroplate liquid includes following component:
According to preparation method of the present invention, it is preferable that in step (3), described electroplate liquid includes following component:
According to preparation method of the present invention, it is preferable that in step (3), cathode-current density is 1～3A/dm2,
Cathode and anode spacing is 0.6～1.5cm, and tank voltage is 2～5V, and the pH value of electroplate liquid is 9.5～11.5, and electroplating temperature is 80～95
DEG C, and electroplating time is 10～50 hours.
The present invention also provides for a kind of electrode for electrolysis containing lanthanum, and described electrode for electrolysis includes stainless steel substrate, dioxy
Change titanium coating and the platinum coating containing lanthanum；Described coating of titanium dioxide is arranged on stainless steel substrate outer surface, and its thickness is 5～10
Micron；The described platinum coating containing lanthanum is arranged on coating of titanium dioxide outer surface, and its thickness is 3～10 microns；Based on containing lanthanum
The gross weight of platinum coating, the described platinum coating containing lanthanum contains the lanthanum of 0.1～5wt%.
The base material of the present invention is stainless steel, wants cheap many relative to titanium or titanium alloy.The present invention is at rustless steel
Form coating of titanium dioxide and platinum coating on base material, and add lanthanum element, this ensure that the use of electrode for electrolysis is stable
Property, during using for a long time, such as ensure that the Cr VI in rustless steel does not penetrates in electrolysis water.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is further illustrated, but protection scope of the present invention is not limited to
This.
In the present invention, " electrode for electrolysis " represents the electrode used in electrolysis process, is preferably electrolysis water and generates dress
Put the electrode of middle use.
In the present invention, " rustless steel " represents in atmosphere or can support erosion-resisting steel alloy in chemical attack medium,
Include but not limited to martensite type rustless steel, ferrite type rustless steel, Austenitic rustless steel, martensite type rustless steel, ferrum element
Body-Austenitic rustless steel.Can contain chromium in the rustless steel of the present invention, its content can be more than 12%.In addition to chromium, this
The rustless steel of invention can add the elements such as nickel, molybdenum that steel can be made to be passivated.
In the present invention, so-called the outer surface of B " A be arranged on ", is not that proper A is fully wrapped around by B, A, B
Between there may be overlapped, intersect, interpenetrative relation.
The preparation method of the electrode for electrolysis containing lanthanum of the present invention comprises the steps: the pretreatment of (1) stainless steel substrate
Step；(2) forming step of coating of titanium dioxide and the forming step of (3) platinum coating containing lanthanum.To be illustrated respectively below.
<pre-treatment step of stainless steel substrate>
The pre-treatment step of the stainless steel substrate of the present invention includes: is polished by stainless steel substrate, carries out oil removing, then in acid
Property solution in etch activation obtain pretreating substrates.The bruting process of stainless steel substrate can be with sand papering, it would however also be possible to employ thin
Sand is polished.When using sand papering, the sand paper of 80～110 mesh can be used, it is preferred to use the sand paper of 90～100 mesh.
Soak to remove the oily matter on surface by the alkaline degreaser of the stainless steel substrate after polishing.Soaking temperature is permissible
Control at 30～45 DEG C, preferably 35～40 DEG C.Soak time is not particularly limited, with the oiliness by stainless steel substrate surface
Material is removed and is totally limited.The alkaline degreaser of the present invention can be containing 10～35g/L tertiary sodium phosphates and 5～13g/L sodium silicate
Aqueous solution, be preferably containing 15～30g/L tertiary sodium phosphates and the aqueous solution of 6～11g/L sodium silicate, more preferably containing 20～25g/
L tertiary sodium phosphate and the aqueous solution of 8～10g/L sodium silicate.The acid solution of the present invention include 10～20wt% nitric acid, 30～
40wt% hydrochloric acid and 45～55wt% water, preferably include 12～18wt% nitric acid, 32～38wt% hydrochloric acid and 46～52wt% water,
More preferably include 15～17wt% nitric acid, 33～35wt% hydrochloric acid and 49～51wt% water.Wherein, the percentage by weight of nitric acid
With HNO3Calculating, the percentage by weight of hydrochloric acid calculates with HCl.According to a specific embodiment of the present invention, the acid of the present invention
Property solution is made up of 10～20wt% nitric acid, 30～40wt% hydrochloric acid and 45～55wt% water.
The etch in an acidic solution of stainless steel substrate after oil removal treatment being activated, etch activation temperature can be at room temperature
Carry out.Etch soak time can control at 60～80 seconds, preferably 65～75 seconds.The purpose of etch activation is so that stainless
The solution intending forming coating of titanium dioxide is easily adhered on steel surface.
<forming step of coating of titanium dioxide>
The forming step of the coating of titanium dioxide of the present invention includes: form two on the pretreating substrates that above-mentioned steps obtains
Titania coating, thus obtain the electrode for electrolysis containing coating of titanium dioxide.In the present invention, intend forming coating of titanium dioxide
The instantiation of solution is ammonium hexa-fluorotitanate and the mixed solution of boric acid formation, but the present invention is not limited to this.Mix with above-mentioned
The solution that can form coating of titanium dioxide that solution is similar to falls within the scope of the present invention.
According to an embodiment of the invention, described pretreating substrates is placed in ammonium hexa-fluorotitanate and that boric acid is formed is mixed
Close in solution, take out after soaking 10～50 hours at 35～55 DEG C and dry, then under inert gas shielding, 500～700
Heat treatment 50～80 minutes at DEG C, obtain the electrode for electrolysis containing coating of titanium dioxide after natural cooling.
In the present invention, hexafluorotitanic acid ammonium concentration can be 0.2～0.35mol/L, preferably 0.25～0.3mol/L；Boron
Acid concentration can be 0.2～0.35mol/L, preferably 0.25～0.3mol/L.In the present invention, soaking temperature be preferably 38～
52 DEG C, more preferably 40～45 DEG C；Soak time is preferably 15～30 hours, more preferably 20～25 hours.
In order to ensure that coating of titanium dioxide is evenly distributed on stainless steel substrate, above-mentioned heat treatment can be protected at noble gas
Protect down carry out.Noble gas can be selected from nitrogen, argon and helium etc..The temperature of heat treatment is preferably 550～650 DEG C, more excellent
Elect 580～600 DEG C as；Heat treatment time is preferably 55～75 minutes, more preferably 60～70 minutes.
Stainless steel substrate after heat treatment is naturally cooled to room temperature, obtains the electrode for electrolysis containing coating of titanium dioxide.
So obtain containing coating of titanium dioxide more dense uniform.
<forming step of the platinum coating containing lanthanum>
The forming step of the platinum coating containing lanthanum of the present invention includes: the electricity containing coating of titanium dioxide above-mentioned steps obtained
Solution electrode is anode as negative electrode, platinum guaze, with comprise lanthanum compound and platinum compounds solution as electroplate liquid, contain two described
Form the platinum coating containing lanthanum on the electrode for electrolysis of titania coating, thus obtain the electrode for electrolysis containing lanthanum.
The electroplate liquid of the present invention is the solution comprising lanthanum compound and platinum compounds." solution " of the present invention represents plating material
The mixture that material is formed with solvent.Above-mentioned lanthanum compound is water miscible lanthanum salt, can be selected from Lanthanum (III) nitrate or lanthanum chloride, is preferably
Lanthanum (III) nitrate.Above-mentioned platinum compounds is water miscible platinum salt, can be selected from dinitroso two ammino platinum (NH3)2Pt(NO2)2·H2O、
Chloroplatinic acid H2PtCl6·6H2O etc., preferably dinitroso two ammino platinum.
According to a specific embodiment of the present invention, described electroplate liquid includes following component:
Detailed description of the invention according to another preferred, described electroplate liquid is made up of following component:
According to the preferred embodiments of the disclosure, described electroplate liquid includes following component:
Preferred embodiment according to another preferred, described electroplate liquid is made up of said components.
According to the detailed description of the invention that the present invention is further preferred, described electroplate liquid includes following component:
The most further preferred detailed description of the invention, described electroplate liquid is by said components group
Become.
The forming step of the platinum coating containing lanthanum of the present invention can be carried out, the most not in the electroplating device that this area is conventional
Repeat again.In the forming step of the platinum coating containing lanthanum of the present invention, cathode-current density can be 1～3A/dm2, be preferably 1.5
～2A/dm2；Cathode and anode spacing can be 0.6～1.5cm, be preferably 0.8～1.0cm；Tank voltage can be 2～5V, be preferably
3～3.5V；The pH value of electroplate liquid can be 9.5～11.5, be preferably 10～11；Electroplating temperature is 80～95 DEG C, is preferably 85
～90 DEG C；Electroplating time can be 10～50 hours, be preferably 20～30 hours.
<electrode for electrolysis>
The electrode for electrolysis of the present invention includes stainless steel substrate, coating of titanium dioxide and the platinum coating containing lanthanum.In the present invention
In, described coating of titanium dioxide is arranged on stainless steel substrate outer surface, and its thickness is 5～10 microns, preferably 6～8 microns.
The described platinum coating containing lanthanum is arranged on coating of titanium dioxide outer surface, and its thickness is 3～10 microns, preferably 5～8 microns,
More preferably 5.5～7.5 microns.In the present invention, gross weight based on the platinum coating containing lanthanum, the described platinum coating containing lanthanum contains
Have 0.1～5wt%, preferably 0.2～3wt%, more preferably 0.5～the lanthanum of 2wt%.Present inventor unexpectedly sends out
Existing, platinum coating increases a small amount of lanthanum element, significantly increases its stability in use so that main material is stainless electrode
It is applied to electrolytic water generating device become a reality.
<mensuration of the content of 6-valence Cr ions in water>
(1) content of 6-valence Cr ions in the diphenyl carbazide spectrophotometry detection water of GB7467-1987 is used；
(2) using the content of 6-valence Cr ions in water with ion chromatography, concrete steps see that " ion-chromatographic determination is drunk
Cr VI in water ", Hu Zhongyang etc., the 14th national chromatography of ions symposium collection of thesis, on JIUYUE 17th, 2012.
Embodiment 1
(1) pre-treatment step of stainless steel substrate:
Stainless steel substrate is used the sand papering of 90 mesh, the stainless steel substrate after polishing is used alkaline degreasing at 35 DEG C
Agent is soaked and is carried out oil removing.Alkaline degreaser is containing 22g/L tertiary sodium phosphate and the aqueous solution of 9g/L sodium silicate.Stainless by after oil removing
Steel substrate etch in an acidic solution obtains pretreating substrates after activating 70 seconds.Acid solution is 17wt% nitric acid, 33wt% salt
The solution that acid and 50wt% water are formed.
(2) forming step of coating of titanium dioxide:
Described pretreating substrates is placed in 0.25mol/L ammonium hexa-fluorotitanate and the mixed solution of 0.25mol/L boric acid formation
In, soak to take out after 25 hours at 40 DEG C and dry, the most under nitrogen protection, at 600 DEG C heat treatment 60 minutes, the coldest
Obtain the electrode for electrolysis containing coating of titanium dioxide the most afterwards.
(3) forming step of the platinum coating containing lanthanum:
It is anode using the electrode for electrolysis containing coating of titanium dioxide as negative electrode, platinum guaze, with following solution as electroplate liquid,
The formation platinum coating containing lanthanum on electrode for electrolysis containing coating of titanium dioxide:
Plating conditions is as follows: cathode-current density is 2A/dm2, cathode and anode spacing is 1cm, and tank voltage is 3V, electroplate liquid
PH value is 10, and electroplating temperature is 85 DEG C, and electroplating time is 20 hours.
Electrode for electrolysis A1 is prepared by embodiment 1.This electrode for electrolysis is by stainless steel substrate, coating of titanium dioxide
Form with the platinum coating containing lanthanum.After testing, the thickness of coating of titanium dioxide is 7 microns, and the thickness of the platinum coating containing lanthanum is 6 micro-
Rice, wherein contains the lanthanum of 1.5wt%.
Disclosed in the Chinese patent literature of Application No. 201120553451.X (Authorization Notice No. CN202440350U)
Carrying out Electrolytic Water Experiment on electrolytic water generating device (uses electrode for electrolysis A1 to replace Ti-alloy anode；Voltage is 5.2V, electric current
For 25A, water source is tap water).The Cr VI in diphenyl carbazide spectrophotometry and water with ion chromatography is used to contain
Amount.After continued electrolysis water carries out 1000 hours, in the water generated, still it is not detected by Cr VI.
Embodiment 2
By 0.63g/L, the Lanthanum (III) nitrate consumption of embodiment 1 is replaced with 0.5g/L, and remaining condition is same as in Example 1, preparation
Obtain electrode for electrolysis A2.This electrode for electrolysis is made up of stainless steel substrate, coating of titanium dioxide and the platinum coating containing lanthanum.Through inspection
Surveying, the thickness of coating of titanium dioxide is 7 microns, and the thickness of the platinum coating containing lanthanum is 6 microns, wherein contains the lanthanum of 1.2wt%.
Disclosed in the Chinese patent literature of Application No. 201120553451.X (Authorization Notice No. CN202440350U)
Carrying out Electrolytic Water Experiment on electrolytic water generating device (uses electrode for electrolysis A2 to replace Ti-alloy anode；Voltage is 5.2V, electric current
For 25A, water source is tap water).The Cr VI in diphenyl carbazide spectrophotometry and water with ion chromatography is used to contain
Amount.After continued electrolysis water carries out 1000 hours, in the water generated, still it is not detected by Cr VI.
Embodiment 3
The hexafluorotitanic acid ammonium concentration of embodiment 1 is replaced with 0.2mol/L, boric acid concentration replaces with 0.2mol/L, remaining
Part is same as in Example 1, prepares electrode for electrolysis A3.This electrode for electrolysis by stainless steel substrate, coating of titanium dioxide and
Platinum coating composition containing lanthanum.After testing, the thickness of coating of titanium dioxide is 6 microns, and the thickness of the platinum coating containing lanthanum is 6 microns,
Wherein contain the lanthanum of 1.5wt%.
Disclosed in the Chinese patent literature of Application No. 201120553451.X (Authorization Notice No. CN202440350U)
Carrying out Electrolytic Water Experiment on electrolytic water generating device (uses electrode for electrolysis A3 to replace Ti-alloy anode；Voltage is 5.2V, electric current
For 25A, water source is tap water).The Cr VI in diphenyl carbazide spectrophotometry and water with ion chromatography is used to contain
Amount.After continued electrolysis water carries out 1000 hours, in the water generated, still it is not detected by Cr VI.
The present invention is not limited to above-mentioned embodiment, in the case of without departing substantially from the flesh and blood of the present invention, and this area skill
Art personnel it is contemplated that any deformation, improve, replace and each fall within the scope of the present invention.
Claims (10)
1. the preparation method of the electrode for electrolysis containing lanthanum, it is characterised in that described preparation method comprises the steps:
(1) pre-treatment step of stainless steel substrate:
Being polished by stainless steel substrate, carry out oil removing, etch activation obtains pretreating substrates the most in an acidic solution；
(2) forming step of coating of titanium dioxide:
Described pretreating substrates is formed coating of titanium dioxide, thus obtains the electrode for electrolysis containing coating of titanium dioxide；
(3) forming step of the platinum coating containing lanthanum:
It is anode using the described electrode for electrolysis containing coating of titanium dioxide as negative electrode, platinum guaze, to comprise lanthanum compound and platinum
The solution of compound is electroplate liquid, forms the platinum coating containing lanthanum, thus obtain on the described electrode for electrolysis containing coating of titanium dioxide
To the electrode for electrolysis containing lanthanum.
Preparation method the most according to claim 1, it is characterised in that:
In step (1), stainless steel substrate is used the sand papering of 80～110 mesh, by the stainless steel substrate after polishing 30
～carrying out oil removing with alkaline degreaser immersion at 45 DEG C, etch activation obtains pretreatment base in 60～80 seconds the most in an acidic solution
Material.
Preparation method the most according to claim 2, it is characterised in that:
In step (1), described alkaline degreaser is containing 10～35g/L tertiary sodium phosphates and the aqueous solution of 5～13g/L sodium silicate；
Described acid solution includes 10～20wt% nitric acid, 30～40wt% hydrochloric acid and 45～55wt% water.
Preparation method the most according to claim 1, it is characterised in that:
In step (2), described pretreating substrates is placed in the mixed solution of ammonium hexa-fluorotitanate and boric acid formation, in 35～55
Soak at DEG C to take out after 10～50 hours and dry, then under inert gas shielding, at 500～700 DEG C heat treatment 50～80
Minute, obtain the electrode for electrolysis containing coating of titanium dioxide after natural cooling.
Preparation method the most according to claim 4, it is characterised in that:
In step (2), the hexafluorotitanic acid ammonium concentration in described mixed solution is 0.2～0.35mol/L and boric acid concentration is
0.2～0.35mol/L.
Preparation method the most according to claim 1, it is characterised in that: in step (3), described lanthanum compound is selected from nitric acid
Lanthanum or lanthanum chloride；Described platinum compounds is selected from dinitroso two ammino platinum or chloroplatinic acid.
Preparation method the most according to claim 1, it is characterised in that:
In step (3), described electroplate liquid includes following component:
Preparation method the most according to claim 1, it is characterised in that:
In step (3), described electroplate liquid includes following component:
Preparation method the most according to claim 1, it is characterised in that:
In step (3), cathode-current density is 1～3A/dm2, cathode and anode spacing is 0.6～1.5cm, and tank voltage is 2～5V,
The pH value of electroplate liquid is 9.5～11.5, and electroplating temperature is 80～95 DEG C, and electroplating time is 10～50 hours.
10. the electrode for electrolysis containing lanthanum, it is characterised in that described electrode for electrolysis includes stainless steel substrate, titanium dioxide
Titanium coating and the platinum coating containing lanthanum；Described coating of titanium dioxide is arranged on stainless steel substrate outer surface, and its thickness is 5～10 micro-
Rice；The described platinum coating containing lanthanum is arranged on coating of titanium dioxide outer surface, and its thickness is 3～10 microns；Based on the platinum containing lanthanum
The gross weight of coating, the described platinum coating containing lanthanum contains the lanthanum of 0.1～5wt%.
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