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Kuphunzira pakukana kwa dzimbiri kwa graphene / kaboni nanotube wolimbitsa zokutira za alumina ceramic

1. Kukonzekera zokutira
Pofuna kuwongolera mayeso a electrochemical pambuyo pake, 30mm amasankhidwa × 4 mm 304 chitsulo chosapanga dzimbiri ngati maziko.Polish ndi kuchotsa otsalira okusayidi wosanjikiza ndi dzimbiri mawanga pamwamba pa gawo lapansi ndi sandpaper, anawaika mu beaker munali acetone, kuchitira madontho padziko gawo lapansi ndi bg-06c akupanga zotsukira wa Bangjie zamagetsi kampani 20min, chotsani madontho pamwamba pa gawo lapansi. kuvala zinyalala pamwamba pa chitsulo gawo lapansi ndi mowa ndi osungunula madzi, ndi ziume ndi blower.Kenako, alumina (Al2O3), graphene ndi hybrid carbon nanotube (mwnt-coohsdbs) anakonzedwa molingana (100: 0: 0, 99.8: 0.2: 0, 99.8: 0: 0.2, 99.6: 0.2: 0.2), ndi kuikidwa mu mphero ya mpira (qm-3sp2 ya fakitale ya zida za Nanjing NANDA) yogaya mpira ndi kusakaniza.Liwiro lozungulira la mphero ya mpira lidayikidwa ku 220 R / min, ndipo mphero ya mpira idatembenuzidwa.

Pambuyo pa mphero ya mpira, ikani kuthamanga kwa thanki yophera mpira kukhala 1/2 motsatira mpheroyo ikamalizidwa, ndikuyika liwiro la mpheroyo kukhala 1/2 mosinthana pambuyo pomaliza mphero.Mpira wopangidwa ndi ceramic aggregate ndi binder zimasakanizidwa molingana ndi gawo lalikulu la 1.0 ∶ 0.8.Pomaliza, zokutira zomatira za ceramic zidapezedwa mwa kuchiritsa.

2. Kuyesa kwa dzimbiri
Mu phunziro ili, electrochemical dzimbiri mayeso utenga Shanghai Chenhua chi660e electrochemical workstation, ndi mayeso utenga atatu ma elekitirodi mayeso dongosolo.Elekitirodi ya platinamu ndi electrode yothandizira, elekitirodi ya silver chloride ndiyo maelekitirodi, ndipo chitsanzo chokutidwa ndi ma elekitirodi ogwirira ntchito, okhala ndi malo owoneka bwino a 1cm2.Lumikizani electrode yowunikira, electrode yogwira ntchito ndi electrode yothandizira mu selo la electrolytic ndi chida, monga momwe tawonetsera mu Zithunzi 1 ndi 2. Musanayambe kuyesa, tsitsani chitsanzo mu electrolyte, yomwe ndi 3.5% NaCl yankho.

3. Kusanthula kwa Tafel kwa kuwonongeka kwa electrochemical kwa zokutira
Chithunzi cha 3 chikuwonetsa mapindikidwe a Tafel a gawo lapansi losatsekedwa ndi zokutira za ceramic zokutidwa ndi zowonjezera za nano pambuyo pakuwonongeka kwa electrochemical kwa 19h.Mphamvu ya corrosion voltage, kachulukidwe wa dzimbiri komanso kuyesa kwamagetsi komwe kumachokera ku mayeso a electrochemical corrosion zikuwonetsedwa mu Gulu 1.

Tumizani
Pamene kachulukidwe ka corrosion kachulukidwe kameneka kamakhala kakang'ono ndipo mphamvu yokana kuwononga ndipamwamba, kukana kwa dzimbiri kwa zokutira kumakhala bwinoko.Zitha kuwoneka kuchokera pa Chithunzi 3 ndi tebulo 1 kuti nthawi ya dzimbiri ikafika 19h, voteji yochuluka ya zitsulo zopanda kanthu ndi -0.680 V, ndipo kachulukidwe kamakono ka masanjidwewo ndi wamkulu kwambiri, kufika 2.890 × 10-6 A. /cm2 . Ikakutidwa ndi zokutira koyera za alumina ceramic, kachulukidwe wa dzimbiri pano adatsika mpaka 78% ndipo PE inali 22.01%.Zimasonyeza kuti zokutira za ceramic zimagwira ntchito yabwino yotetezera ndipo zimatha kupititsa patsogolo kukana kwa dzimbiri kwa zokutira mu electrolyte yopanda ndale.

Pamene 0.2% mwnt-cooh-sdbs kapena 0.2% graphene anawonjezeredwa ku zokutira, dzimbiri panopa kachulukidwe anachepa, kukana kuwonjezeka, ndi kukana dzimbiri ❖ kuyanika anawonjezera bwino, ndi PE wa 38.48% ndi 40.10% motero.Pamene pamwamba ndi yokutidwa ndi 0.2% mwnt-cooh-sdbs ndi 0,2% graphene wosakaniza aluminiyamu zokutira, dzimbiri panopa kuchepetsedwa kuchokera 2.890 × 10-6 A / cm2 mpaka 1.536 × 10-6 A / cm2, kukana pazipita mtengo, kuchuluka kuchokera 11388 Ω mpaka 28079 Ω, ndipo PE ya zokutira imatha kufika 46.85%.Zimasonyeza kuti chandamale chandamale mankhwala ali ndi zabwino dzimbiri kukana, ndi synergistic zotsatira za carbon nanotubes ndi graphene akhoza bwino patsogolo dzimbiri kukana kwa ❖ kuyanika ceramic.

4. Zotsatira za kuviika nthawi pa ❖ kuyanika impedance
Kuti mupitirize kufufuza kukana kwa dzimbiri kwa zokutira, poganizira mphamvu ya nthawi ya kumizidwa kwa chitsanzo mu electrolyte pa mayeso, kusintha kokhota kwa kukana kwa zokutira zinayi pa nthawi yomiza yosiyana kumapezeka, monga momwe tawonetsera pa chithunzi. 4.

Tumizani
Pa gawo loyambirira la kumizidwa (10 h), chifukwa cha kachulukidwe kabwino ndi kapangidwe ka zokutira, electrolyte ndizovuta kumiza mu zokutira.Panthawi imeneyi, zokutira za ceramic zimasonyeza kukana kwakukulu.Pambuyo pakuwuka kwa nthawi, kukana kumachepa kwambiri, chifukwa m'kupita kwa nthawi, electrolyte pang'onopang'ono imapanga njira yowonongeka kupyolera mu pores ndi ming'alu ya zokutira ndikulowa mu matrix, zomwe zimapangitsa kuchepa kwakukulu kwa kukana kwa matrix. zokutira.

Mu gawo lachiwiri, zinthu zowonongeka zikawonjezeka kufika pamlingo wina, kufalikira kumatsekedwa ndipo kusiyana kumatsekedwa pang'onopang'ono.Panthawi imodzimodziyo, pamene electrolyte imalowa mu mawonekedwe omangirira pansi / masanjidwewo, mamolekyu amadzi adzachitapo kanthu ndi Fe element mu masanjidwewo pamphambano yokutira / masanjidwewo kuti apange filimu yopyapyala yachitsulo ya oxide, yomwe imalepheretsa kulowa kwa electrolyte mu matrix ndikuwonjezera kukana.Pamene chopanda zitsulo masanjidwewo ndi electrochemically corroded, ambiri wobiriwira flocculent mpweya amapangidwa pansi pa electrolyte.Yankho la electrolytic silinasinthe mtundu pa electrolyzing sampuli yokutidwa, zomwe zingatsimikizire kukhalapo kwa mankhwala omwe ali pamwambawa.

Chifukwa cha nthawi yaying'ono yonyowa komanso zinthu zazikulu zakunja zomwe zimakhudzidwa, kuti mupitirize kupeza kusintha kolondola kwa ma electrochemical parameters, ma curve a Tafel a 19 h ndi 19.5 h amawunikidwa.Kuchuluka kwa dzimbiri ndi kukana komwe kumapezeka ndi pulogalamu ya zsimpwin kusanthula kukuwonetsedwa mu Table 2. Zitha kupezeka kuti zikanyowetsedwa kwa 19 h, poyerekeza ndi gawo lapansi lopanda kanthu, kachulukidwe kakachulukidwe ka aluminiyamu koyera ndi zokutira zophatikiza za alumina zomwe zili ndi zida zowonjezera za nano ndi zing'onozing'ono ndipo mtengo wotsutsa ndi waukulu.Kukana mtengo wa ceramic ❖ kuyanika munali mpweya nanotubes ndi ❖ kuyanika munali graphene pafupifupi chimodzimodzi, pamene ❖ kuyanika dongosolo ndi carbon nanotubes ndi graphene gulu zipangizo kwambiri kumatheka, Ichi ndi chifukwa synergistic zotsatira za mbali imodzi mpweya nanotubes ndi awiri dimensional graphene. kumawonjezera kukana dzimbiri kwa zinthu.

Ndi kuwonjezeka kwa nthawi yomiza (19.5 h), kukana kwa gawo lapansi lopanda kanthu kumawonjezeka, kusonyeza kuti ndi gawo lachiwiri la dzimbiri ndipo filimu yachitsulo ya oxide imapangidwa pamwamba pa gawo lapansi.Mofananamo, ndi kuwonjezeka kwa nthawi, kukana koyera alumina ceramic ❖ kuyanika kumawonjezeka, kusonyeza kuti pa nthawi ino, ngakhale pali pang'onopang'ono ❖ kuyanika ceramic, electrolyte walowa ndi chomangira mawonekedwe ❖ kuyanika / masanjidwewo, ndi kupanga okusayidi filimu. kudzera mankhwala anachita.
Poyerekeza ndi zokutira za alumina zomwe zili ndi 0.2% mwnt-cooh-sdbs, zokutira za alumina zomwe zimakhala ndi 0.2% graphene ndi zokutira za alumina zomwe zili ndi 0.2% mwnt-cooh-sdbs ndi 0.2% graphene, kukana kwa zokutira kunachepa kwambiri ndi kuwonjezeka kwa nthawi, kunachepa. ndi 22,94%, 25.60% ndi 9.61% motero, kusonyeza kuti electrolyte sanalowe mu olowa pakati ❖ kuyanika ndi gawo lapansi pa nthawi ino, Ichi ndi chifukwa dongosolo mpweya nanotubes ndi graphene midadada kutsika malowedwe electrolyte, motero kuteteza. matrix.Zotsatira za synergistic za awiriwa zimatsimikiziridwanso.Chophimba chokhala ndi zida ziwiri za nano chimakhala ndi kukana kwa dzimbiri bwino.

Kudzera pamapindikira a Tafel ndi kusintha kopindika kwa mtengo wamagetsi oletsa mphamvu, zimapezeka kuti zokutira za alumina ceramic ndi graphene, ma carbon nanotubes ndi osakaniza awo amatha kusintha kukana kwa dzimbiri kwachitsulo masanjidwewo, ndi synergistic zotsatira za ziwirizi zitha kupititsa patsogolo dzimbiri. kukana kwa zokutira zomatira za ceramic.Kuti mupitirize kufufuza zotsatira za zowonjezera za nano pa kukana kwa dzimbiri kwa ❖ kuyanika, kapangidwe kakang'ono kakang'ono kameneka kameneka kamene kamakhalapo pambuyo pa zowonongeka.

Tumizani

Chithunzi 5 (A1, A2, B1, B2) chikuwonetsa mawonekedwe a pamwamba a 304 zitsulo zosapanga dzimbiri komanso zomatira zoyera za aluminiyamu zadothi pakukula kosiyana pambuyo pa dzimbiri.Chithunzi 5 (A2) chikuwonetsa kuti pamtunda pambuyo pa dzimbiri kumakhala kovuta.Kwa gawo lapansi lopanda kanthu, maenje angapo akuluakulu a dzimbiri amawonekera pamtunda pambuyo pa kumizidwa mu electrolyte, kusonyeza kuti kukana kwa dzimbiri kwa chitsulo chopanda kanthu kumachepa ndipo electrolyte ndiyosavuta kulowa mu matrix.Kwa zokutira koyera za aluminiyamu za ceramic, monga momwe zikusonyezedwera mu Chithunzi 5 (B2), ngakhale ngalande zaporous corrosion zimapangidwa pambuyo pa dzimbiri, kamangidwe kamene kamakhala wandiweyani komanso kukana kwambiri kwa dzimbiri kwa zokutira koyera za alumina ceramic kumalepheretsa kuwukira kwa electrolyte, komwe kumafotokoza chifukwa kupititsa patsogolo bwino kwa impedance ya zokutira za alumina ceramic.

Tumizani

Mapangidwe apamwamba a mwnt-cooh-sdbs, zokutira zomwe zili ndi 0.2% graphene ndi zokutira zomwe zili ndi 0.2% mwnt-cooh-sdbs ndi 0.2% graphene.Tingaone kuti zokutira ziwiri munali graphene mu Chithunzi 6 (B2 ndi C2) ndi dongosolo lathyathyathya, kumanga pakati particles mu ❖ kuyanika ndi zolimba, ndi akaphatikiza particles ali mwamphamvu wokutidwa ndi zomatira.Ngakhale kuti pamwamba pake amakokoloka ndi electrolyte, njira zochepa za pore zimapangidwa.Pambuyo pa dzimbiri, zokutira pamwamba ndi wandiweyani ndipo pali zochepa zowonongeka zowonongeka.Kwa Chithunzi 6 (A1, A2), chifukwa cha mawonekedwe a mwnt-cooh-sdbs, zokutira zisanachitike dzimbiri ndi mawonekedwe a porous omwe amagawidwa mofanana.Pambuyo pa dzimbiri, ma pores a gawo loyambirira amakhala opapatiza komanso aatali, ndipo njirayo imakhala yozama.Poyerekeza ndi Chithunzi 6 (B2, C2), kapangidwe kake kamakhala ndi zolakwika zambiri, zomwe zimagwirizana ndi kukula kwa ❖ kuyanika kwamtengo wopindika wotengedwa ku mayeso a dzimbiri la electrochemical.Zimasonyeza kuti zokutira za alumina ceramic zomwe zimakhala ndi graphene, makamaka kusakaniza kwa graphene ndi carbon nanotube, zimakhala ndi mphamvu zowonongeka bwino.Izi ndichifukwa choti kapangidwe ka carbon nanotube ndi graphene kumatha kuletsa kufalikira kwa mng'alu ndikuteteza masanjidwewo.

5. Kukambitsirana ndi chidule
Kupyolera mu kuyesa kukana kwa dzimbiri kwa carbon nanotubes ndi zowonjezera za graphene pa zokutira za alumina ceramic ndi kusanthula kwa microstructure ya pamwamba pa zokutira, mfundo zotsatirazi zikutsatiridwa:

(1) Pamene dzimbiri nthawi 19 h, kuwonjezera 0,2% wosakanizidwa mpweya nanotube + 0,2% graphene osakaniza zinthu alumina ceramic ❖ kuyanika, dzimbiri panopa kachulukidwe chinawonjezeka kuchokera 2.890 × 10-6 A / cm2 mpaka 1.536 × 10-6 A / cm2, mphamvu yamagetsi yawonjezeka kuchoka pa 11388 Ω kufika pa 28079 Ω, ndipo kukana kwa dzimbiri ndiko kwakukulu, 46.85%.Poyerekeza ndi zokutira koyera za alumina ceramic, zokutira zophatikizika ndi graphene ndi ma carbon nanotubes zimakhala ndi kukana dzimbiri bwino.

(2) Ndi kuchuluka kwa kumizidwa nthawi ya electrolyte, electrolyte imalowa m'malo olumikizirana ndi zokutira / gawo lapansi kuti apange filimu yachitsulo ya oxide, yomwe imalepheretsa kulowa kwa electrolyte mu gawo lapansi.Mphamvu yamagetsi imayamba kuchepa kenako ndikuwonjezeka, ndipo kukana kwa dzimbiri kwa zokutira koyera kwa alumina ceramic ndikosavuta.Mapangidwe ndi ma synergy a carbon nanotubes ndi graphene anatsekereza kulowa pansi kwa electrolyte.Pamene zidaviikidwa kwa 19.5 h, kutsekedwa kwa magetsi kwa zokutira zomwe zili ndi nano zida kuchepa ndi 22.94%, 25.60% ndi 9.61% motsatira, ndipo kukana kwa dzimbiri kwa zokutira kunali kwabwino.

6. Chikoka limagwirira ❖ kuyanika dzimbiri kukana
Kudzera pamapindikira a Tafel ndi kusintha kopindika kwa mtengo wamagetsi oletsa mphamvu, zimapezeka kuti zokutira za alumina ceramic ndi graphene, ma carbon nanotubes ndi osakaniza awo amatha kusintha kukana kwa dzimbiri kwachitsulo masanjidwewo, ndi synergistic zotsatira za ziwirizi zitha kupititsa patsogolo dzimbiri. kukana kwa zokutira zomatira za ceramic.Kuti mupitirize kufufuza zotsatira za zowonjezera za nano pa kukana kwa dzimbiri kwa ❖ kuyanika, kapangidwe kakang'ono kakang'ono kameneka kameneka kamene kamakhalapo pambuyo pa zowonongeka.

Chithunzi 5 (A1, A2, B1, B2) chikuwonetsa mawonekedwe a pamwamba a 304 zitsulo zosapanga dzimbiri komanso zomatira zoyera za aluminiyamu zadothi pakukula kosiyana pambuyo pa dzimbiri.Chithunzi 5 (A2) chikuwonetsa kuti pamtunda pambuyo pa dzimbiri kumakhala kovuta.Kwa gawo lapansi lopanda kanthu, maenje angapo akuluakulu a dzimbiri amawonekera pamtunda pambuyo pa kumizidwa mu electrolyte, kusonyeza kuti kukana kwa dzimbiri kwa chitsulo chopanda kanthu kumachepa ndipo electrolyte ndiyosavuta kulowa mu matrix.Kwa zokutira koyera za aluminiyamu za ceramic, monga momwe zikusonyezedwera mu Chithunzi 5 (B2), ngakhale ngalande zaporous corrosion zimapangidwa pambuyo pa dzimbiri, kamangidwe kamene kamakhala wandiweyani komanso kukana kwambiri kwa dzimbiri kwa zokutira koyera za alumina ceramic kumalepheretsa kuwukira kwa electrolyte, komwe kumafotokoza chifukwa kupititsa patsogolo bwino kwa impedance ya zokutira za alumina ceramic.

Mapangidwe apamwamba a mwnt-cooh-sdbs, zokutira zomwe zili ndi 0.2% graphene ndi zokutira zomwe zili ndi 0.2% mwnt-cooh-sdbs ndi 0.2% graphene.Tingaone kuti zokutira ziwiri munali graphene mu Chithunzi 6 (B2 ndi C2) ndi dongosolo lathyathyathya, kumanga pakati particles mu ❖ kuyanika ndi zolimba, ndi akaphatikiza particles ali mwamphamvu wokutidwa ndi zomatira.Ngakhale kuti pamwamba pake amakokoloka ndi electrolyte, njira zochepa za pore zimapangidwa.Pambuyo pa dzimbiri, zokutira pamwamba ndi wandiweyani ndipo pali zochepa zowonongeka zowonongeka.Kwa Chithunzi 6 (A1, A2), chifukwa cha mawonekedwe a mwnt-cooh-sdbs, zokutira zisanachitike dzimbiri ndi mawonekedwe a porous omwe amagawidwa mofanana.Pambuyo pa dzimbiri, ma pores a gawo loyambirira amakhala opapatiza komanso aatali, ndipo njirayo imakhala yozama.Poyerekeza ndi Chithunzi 6 (B2, C2), kapangidwe kake kamakhala ndi zolakwika zambiri, zomwe zimagwirizana ndi kukula kwa ❖ kuyanika kwamtengo wopindika wotengedwa ku mayeso a dzimbiri la electrochemical.Zimasonyeza kuti zokutira za alumina ceramic zomwe zimakhala ndi graphene, makamaka kusakaniza kwa graphene ndi carbon nanotube, zimakhala ndi mphamvu zowonongeka bwino.Izi ndichifukwa choti kapangidwe ka carbon nanotube ndi graphene kumatha kuletsa kufalikira kwa mng'alu ndikuteteza masanjidwewo.

7. Kukambitsirana ndi chidule
Kupyolera mu kuyesa kukana kwa dzimbiri kwa carbon nanotubes ndi zowonjezera za graphene pa zokutira za alumina ceramic ndi kusanthula kwa microstructure ya pamwamba pa zokutira, mfundo zotsatirazi zikutsatiridwa:

(1) Pamene dzimbiri nthawi 19 h, kuwonjezera 0,2% wosakanizidwa mpweya nanotube + 0,2% graphene osakaniza zinthu alumina ceramic ❖ kuyanika, dzimbiri panopa kachulukidwe chinawonjezeka kuchokera 2.890 × 10-6 A / cm2 mpaka 1.536 × 10-6 A / cm2, mphamvu yamagetsi yawonjezeka kuchoka pa 11388 Ω kufika pa 28079 Ω, ndipo kukana kwa dzimbiri ndiko kwakukulu, 46.85%.Poyerekeza ndi zokutira koyera za alumina ceramic, zokutira zophatikizika ndi graphene ndi ma carbon nanotubes zimakhala ndi kukana dzimbiri bwino.

(2) Ndi kuchuluka kwa kumizidwa nthawi ya electrolyte, electrolyte imalowa m'malo olumikizirana ndi zokutira / gawo lapansi kuti apange filimu yachitsulo ya oxide, yomwe imalepheretsa kulowa kwa electrolyte mu gawo lapansi.Mphamvu yamagetsi imayamba kuchepa kenako ndikuwonjezeka, ndipo kukana kwa dzimbiri kwa zokutira koyera kwa alumina ceramic ndikosavuta.Mapangidwe ndi ma synergy a carbon nanotubes ndi graphene anatsekereza kulowa pansi kwa electrolyte.Pamene zidaviikidwa kwa 19.5 h, kutsekedwa kwa magetsi kwa zokutira zomwe zili ndi nano zida kuchepa ndi 22.94%, 25.60% ndi 9.61% motsatira, ndipo kukana kwa dzimbiri kwa zokutira kunali kwabwino.

(3) Chifukwa cha makhalidwe a carbon nanotubes, ❖ kuyanika anawonjezera mpweya nanotubes yekha ali uniformly anagawira porous dongosolo pamaso dzimbiri.Pambuyo pa dzimbiri, ma pores a gawo loyambirira amakhala opapatiza komanso aatali, ndipo ngalandezo zimakhala zozama.The ❖ kuyanika munali graphene ali lathyathyathya dongosolo pamaso dzimbiri, kuphatikiza particles mu ❖ kuyanika ndi pafupi, ndi akaphatikiza particles ali mwamphamvu wokutidwa ndi zomatira.Ngakhale kuti pamwamba pake amakokoloka ndi electrolyte pambuyo pa dzimbiri, pali njira zochepa za pore ndipo mawonekedwe ake akadali wandiweyani.Mapangidwe a carbon nanotubes ndi graphene amatha kuletsa kufalikira kwa mng'alu ndikuteteza masanjidwewo.


Nthawi yotumiza: Mar-09-2022