Hlau Oxide Titanium Electrodes Classification Thiab Kev Npaj

1. Kev faib tawm ntawm cov hlau oxide electrodes

Cov hlau oxide electrode (tseem hu ua DSA electrode) sivtitaniumraws li ib tug substrate, thiab ib tug hlau oxide txheej ntawm ib tug tej thickness yog npaj rau nws nto. Cov txheej txheem yog tsim los ntawm platinum pawg hlau oxides, thiab tom qab ntawd lwm cov hlau tsis muaj zog, xws li TiO.₂, Tau₂0₅, thiab lwm yam ntxiv. Muaj ntau ntau txoj kev faib.

Raws li tus naj npawb ntawm cov khoom, nws tuaj yeem muab faib ua chav tsev txheej (xws li PbO / Ti, MnO2 / Ti, thiab lwm yam), binary txheej (xws li Ti0₂Ru0₂/Ti, lr0₂Ta₂0₅/Ti, thiab lwm yam. ternary txheej (xws li RuIrTi / Ti, RuCoTi / Ti, RuSnTi / Ti, RuSnlr / Ti, thiab lwm yam), quaternary coatings (xws li RuIrSnTi / Ti) thiab tsib-component coatings (xws li RuIrSnCoTi / Ti. ), thiab lwm yam.

Raws li cov khoom tseem ceeb ntawm cov txheej electrode, nws tuaj yeem muab faib ua manganese-based anodes, lead-based anodes, ruthenium-based anodes, thiab iridium-based anodes. Raws li qhia hauv Table 1.1.

Tab 1 .1 Kev faib tawm thiab kev siv DSA

Raws li cov tshuaj tiv thaiv tseem ceeb uas tshwm sim ntawm qhov chaw electrode, nws feem ntau yog muab faib ua electrodes rau chlorine evolution (tseem coated nrog ruthenium xws li Ti02Ru02 / Ti) thiab electrodes rau oxygen evolution (tsuas yog coated nrog iridium xws li Ir02Ta205 / Ti) Kev npaj. ntawm cov hlau oxide electrodes feem ntau siv thermal oxidation kom tau ib co thickness ntawm hlau oxide ntawm titanium substrate.

1.1 Pretreatment ntawm titanium substrate

Ua ntej pleev xim rau cov hlau oxide, kev kho deg ntawm titanium substrate yuav tsum tau nqa tawm. Nws lub hom phiaj yog tshem tawm cov roj stains thiab oxide zaj duab xis rau ntawm qhov chaw ntawm lub substrate, kom lub substrate nyob rau hauv ib tug active lub xeev, thiaj li mus txhim kho lub sib raug zoo quab yuam ntawm lub txheej thiab titanium substrate, txhim kho cov conductivity ntawm electrode, thiab prolong lub neej kev pab cuam ntawm lub electrode.

Pretreatment ntawm titanium substrate muaj cov kauj ruam hauv qab no: sandblasting, degreasing, acid etching, tu thiab ziab.

1.2 Sandblasting rau saum npoo ntawm titanium substrate yog siv los ntawm huab cua compressed, thiab cov khoom me me ntawm cov xuab zeb (los yog hlau pellets) yog txau rau saum npoo ntawm titanium substrate nrog lub siab ceev airflow thiab ib lub kaum sab xis inclination. Txheej) ntog tawm ntawm lub titanium nto kom tau ib tug zoo pitted nto.

1.3 Tom qab sandblasting, nto ntawm titanium substrate muaj roj stains. Cov kuab tshuaj degreasing (los yog electrolytic degreasing) yuav tsum tau kom txog rau thaum lub substrate yog tsis muaj oily droplets. Txwv tsis pub, lub xub ntiag ntawm cov roj yuav txo tau cov kev sib txuas ntawm lub zog ntawm cov txheej thiab cov substrate. Acid etching yog muab tso rau hauv lub degreasing titanium substrate nyob rau hauv ib tug 0.1kg/L oxalic acid tov (los yog HF tov) thiab etch nws rau 1 mus rau 3 teev nyob rau hauv lub boiling lub xeev. Raws li kev soj ntsuam x-ray diffraction, titanium hydride thiab oxides coexisted nyob rau hauv theem qauv ntawm titanium matrix tom qab ntxuav kua qaub (raws li qhia hauv daim duab 1.2). Cov muaj pes tsawg leeg ntawm titanium hydride tsim nyob rau saum npoo yog ze rau TiH1.79, thiab nws lub zog dawb ntawm kev tsim yog 82.9-85.9 kj/mol, thiab cov muaj pes tsawg leeg yog ruaj khov heev. Ntxiv 2h ntawm 200 degree, nws cov ntsiab lus tseem ceeb tseem tuaj yeem tsis hloov pauv, uas yog qhov zoo heev rau kev khaws cia ntev. Txhawm rau txhim kho lub zog sib txuas ntawm cov txheej txheem thiab txhim kho cov kev coj ua, kev kho cov khoom noj khoom haus tseem ceeb heev, thiab nws yog ib qho tseem ceeb kom paub txog qhov ua kom lub ntsej muag ntawm titanium substrate.

Feem ntau, kev sib khi quab yuam ntawm cov hlau tsis zoo thiab lawv cov oxides nrog titanium oxide yog ntau dua li lawv txoj hlua khi nrog cov ntshiab titanium. Yog li ntawd, ntxiv rau etching titanium substrate ua ntej txheej, qhov saum npoo ntawm titanium substrate yuav tsum tau qhib kom nws ntxeem tau. Titanium oxide txheej, yog li txheej txheem ntawm matrix kev kho mob yog tiag tiag ib tug txheej txheem ntawm activating titanium matrix hlau. Tom qab titanium substrate yog sandblasted, degreasing thiab acid kho, muaj pits ntawm txawv qhov tob ntawm qhov chaw. Lub hav zoov ntawm cov pits no tau txais txiaj ntsig los txhim kho lub zog sib txuas ntawm cov txheej thiab cov substrate. Ua ntej txheej, titanium substrate yuav tsum tau ntxuav nrog ib tug ultrasonic ntsuas kom tshem tawm cov deposited hmoov thiab av nyob rau hauv lub qhov dej thiab nyob rau saum npoo ntawm substrate. Vim tias nyob rau hauv oxalic acid etching, titanium oxalate yog tsim thiab txuas rau saum npoo ntawm titanium substrate. Yog tias titanium substrate raug tshem tawm ntawm lub tank acid, nws tsis tuaj yeem tshem tawm cov deposits los ntawm tsuas yog yaug, txwv tsis pub lub zog ntawm cov txheej thiab titanium substrate yuav raug cuam tshuam. Lub titanium substrate ntxuav yuav tsum tau muab tso rau hauv dej distilled rau tom qab siv los tiv thaiv oxidation ntawm titanium substrate. Ua ntej qhib. Cov dej noo ntawm qhov chaw ntawm titanium substrate thiab micropores yuav tsum tau qhuav. Txwv tsis pub, thaum lub sij hawm txheej txheej, cov dej uas tsis tau ci cuam tshuam nrog titanium ntsev (los yog tin ntsev) hauv cov txheej txheem los tsim cov precipitates, uas yuav ua rau cov txheej txheem poob thiab cuam tshuam rau lub neej kev pab cuam ntawm electrode.

2. Electrode npaj

Cov txheej txheem tsis xws li muaj pes tsawg leeg ntawm cov txheej txheem txheej txheem, qhov concentration ntawm cov txheej txheem txheej txheem, qhov ziab kom qhuav thiab lub sijhawm, thiab thermal oxidation kub thiab lub sijhawm cuam tshuam ncaj qha rau kev ua haujlwm ntawm electrode. Tus naj npawb ntawm txhuam lub sij hawm thiab qhov concentration ntawm cov tshuaj txheej yog cuam tshuam nrog tus nqi txhuam hniav; Tus naj npawb ntawm thermal oxidation lub sij hawm, lub sij hawm thiab kub muaj feem xyuam rau cov electrochemical kev ua tau zoo thiab corrosion kuj ntawm electrode. Tsawg thermal oxidation lub sij hawm, tsis tshua muaj kub, thiab lub sij hawm luv luv, ua rau tsis tiav oxidation ntawm txheej thiab tsis sib xws oxide crystallization, uas yuav txo tau cov catalytic kev ua tau zoo thiab kev pab cuam lub neej ntawm cov electrode; Thaum cov thermal oxidation nce, qhov kub nce, thiab lub sij hawm ntev, Nws yuav ua rau oxidation ntawm titanium matrix thiab nce oxide hais, uas yuav txo tau cov catalytic kev ua tau zoo ntawm cov electrode thiab txo cov kev pab cuam lub neej ntawm cov electrode. . Yog li ntawd, nyob rau hauv lub premise ntawm tsis cuam tshuam rau txheej txheej, ib tug thermal oxidation txheej txheem yuav tsum tau siv tom qab ob peb txhuam kom tsim nyog txo tus naj npawb ntawm thermal oxidation. Tsis tas li ntawd, cov ntsiab lus hauv qab no yuav tsum tau them sai sai rau thaum lub sijhawm npaj:

2.1 Txhua zaus koj pleev xim, txheej yuav tsum nyias thiab txawm. Cov txheej txheem txheej txheem feem ntau yog siv li ntawm 15 mus rau 18 zaug kom tsis txhob muaj ntau qhov sib xyaw lossis agglomeration ntawm txheej txheej ntawm cov txheej txheem substrate.

2.2 Nyob rau hauv lub teeb infrared, cov kuab tshuaj evaporates maj mam, thiab qhov kub thiab txias yog txiav txim siab raws li lub boiling point ntawm cov kuab tshuaj; lub sij hawm tsim nyog rau cov kuab tshuaj kom evaporate tag nrho kom tsis txhob carbonization ntawm cov kuab tshuaj ntawm qhov kub thiab txias thiab cuam tshuam rau kev ua tau zoo ntawm txheej.

2.3 Cov electrode qhuav tag raug xa mus rau lub qhov cub muffle, thiab oxidation kub thiab lub sij hawm raug txiav txim raws li txheej txheej, feem ntau 5-15 feeb.

2.4 Tom qab cov electrode yog thermally oxidized, nws yuav tsum tau txias rau hauv chav tsev kub ua ntej txhuam hniav tom ntej no yuav tsum tau ua los tiv thaiv cov oxide txheej los ntawm kev puas tsuaj los ntawm txias thiab kub.

2.5 Tom qab ua tiav txhuam thiab ziab, thermally oxidize nyob rau hauv lub muffle rau 1 teev kom tag nrho oxidize electrode txheej.

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