Nanostructures za iridium ezikoleddwa mu ngeri ey’enjawulo eziteekeddwa ku mesoporous tantalum oxide zongera ku conductivity, catalytic activity n’okutebenkera okumala ebbanga eddene.
Ekifaananyi: Abanoonyereza mu South Korea ne Amerika bakoze ekirungo ekipya ekya iridium catalyst nga kirimu oxygen evolution reaction activity eyeyongedde okusobola okwanguyiza okulongoosa amazzi mu ngeri etali ya ssente nnyingi nga bakozesa oluwuzi oluwanyisiganya pulotoni okukola haidrojeni. yiga ebisingawo
Obwetaavu bw’amaanyi mu nsi yonna bweyongera okukula. Amasoboza ga haidrojeni agatambuzibwa galina ekisuubizo kinene mu kunoonya kwaffe eby’okugonjoola amaanyi amayonjo era agawangaala. Mu nsonga eno, ebyuma ebisengejja amazzi mu luwuzi lwa pulotoni (PEMWEs), ebikyusa amasoboza g’amasannyalaze agasukkiridde okufuuka amasoboza ga haidrojeni agatambuzibwa okuyita mu kusengejja amazzi, bifunye obwagazi bungi. Naye okukozesa kwayo okunene mu kukola haidrojeni kusigala nga kutono olw’omutindo omutono ogw’okukyukakyuka kwa okisigyeni (OER), ekitundu ekikulu mu kusengejja amasannyalaze, era okutikka ennyo ebirungo ebiziyiza ebyuma eby’ebbeeyi nga iridium (Ir) ne ruthenium oxide mu busannyalazo kuliko ekkomo. . N’olwekyo, okukola ebirungo bya OER ebitasaasaanya ssente nnyingi ate nga bikola bulungi kyetaagisa okusobola okukozesa PEMWE mu bantu bangi.

Gye buvuddeko, ttiimu y’abanoonyereza okuva mu Korea n’Abamerika nga bakulembeddwamu Professor Changho Park okuva mu Gwangju Institute of Science and Technology mu South Korea baakola ekirungo ekipya ekya iridium nanostructured catalyst nga kyesigamiziddwa ku mesoporous tantalum oxide (Ta2O5) nga bayita mu nkola erongooseddwa ey’okukendeeza asidi wa formic okusobola okutuuka ku kusengejja amazzi ga PEM mu ngeri ennungi. . Okunoonyereza kwabwe kwafulumizibwa ku mutimbagano nga May 20, 2023, era nga kugenda kufulumizibwa mu Volume 575 eya Journal of Power Sources nga August 15, 2023. Okunoonyereza kuno kwawandiikibwa wamu ne Dr. Chaekyong Baik, omunoonyereza mu Korea Institute of Science and Technology (KIST).
“Ensengekera ya Ir erimu obusannyalazo esaasaanyizibwa mu ngeri y’emu ku kifo ekinywevu ekya mesoporous Ta2O5 substrate etegekeddwa enkola ya soft template nga egattibwa wamu n’enkola eyeetoolodde ethylenediamine, ekikendeeza obulungi ebiri mu Ir mu bbaatule emu eya PEMWE okutuuka ku 0.3 mg cm-2,” Professor Park bwe yannyonnyodde. . Kikulu okumanya nti dizayini ey’obuyiiya ey’ekirungo kya Ir/Ta2O5 tekoma ku kulongoosa nkozesa ya Ir, naye era erina obutambuzi obw’amaanyi n’ekitundu ekinene eky’okungulu ekikola amasannyalaze.
Okugatta ku ekyo, X-ray photoelectron ne X-ray absorption spectroscopy ziraga enkolagana ey’amaanyi ey’okuwanirira ekyuma wakati wa Ir ne Ta, ate okubala kwa density functional theory kulaga okutambuza kwa chaji okuva ku Ta okudda mu Ir, ekivaako okusiba okw’amaanyi okwa adsorbates nga O ne OH, era ne kukuuma omugerageranyo gwa Ir(III) mu nkola ya OOP oxidation. Kino nakyo kivaamu okweyongera kw’emirimu gya Ir/Ta2O5, erina vvulovumenti eya wansi eya 0.385 V bw’ogeraageranya ne 0.48 V ku IrO2.
Ttiimu era mu kugezesa yalaga omulimu gwa OER ogw’amaanyi ogw’ekirungo ekiziyiza, nga balaba vvulovumenti esukkiridde eya 288 ± 3.9 mV ku 10 mA cm-2 n’emirimu gya Ir mass egy’amaanyi ennyo egya 876.1 ± 125.1 A g-1 ku 1.55 V okutuuka ku muwendo ogukwatagana. ku lwa Mwami Black. Mu butuufu, Ir/Ta2O5 eraga omulimu omulungi ennyo ogwa OER n’okutebenkera, ekyayongera okukakasibwa essaawa ezisukka mu 120 ez’okukola kw’obutoffaali bumu okw’ekibiina ky’oluwuzi-obusannyalazo.
Enkola eteeseddwa erina enkizo bbiri ez’okukendeeza ku mutindo gw’omugugu Ir n’okwongera ku bulungibwansi bwa OER. "Okwongera ku bulungibwansi bwa OER kijjuliza okukendeeza ku nsimbi ezisaasaanyizibwa mu nkola ya PEMWE, bwe kityo ne kirongoosa enkola yaayo okutwalira awamu. Obuwanguzi buno buyinza okukyusa mu kutunda PEMWE n'okwanguyiza okugitwala ng'enkola enkulu ey'okukola haidrojeni," bwatyo Pulofeesa Park alina essuubi bw'agamba. .

Okutwaliza awamu, enkulaakulana eno etusembereza okutuuka ku bigonjoola eby’entambula y’amasoboza ga haidrojeni ebiwangaala era bwe tutyo ne tutuuka ku mbeera ey’obutabeera na kaboni.
Ebikwata ku Gwangju Institute of Science and Technology (GIST) Gwangju Institute of Science and Technology (GIST) yunivasite y’okunoonyereza esangibwa mu Gwangju mu South Korea. GIST yatandikibwawo mu 1993 era efuuse emu ku masomero agasinga ekitiibwa mu South Korea. Yunivasite eno yeewaddeyo okutondawo embeera y’okunoonyereza ey’amaanyi etumbula enkulaakulana ya ssaayansi ne tekinologiya n’okutumbula enkolagana wakati wa pulojekiti z’okunoonyereza ez’ensi yonna n’ez’omunda mu ggwanga. Nga banywerera ku mubala “Proud Shaper of Science and Technology of the Future”, GIST bulijjo ekwata ekifo kya yunivasite ezisinga mu South Korea.
Ebikwata ku bawandiisi Dr. Changho Park abadde pulofeesa mu Gwangju Institute of Science and Technology (GIST) okuva mu August 2016. Nga tannaba kwegatta ku GIST, yaliko omumyuka wa Pulezidenti wa Samsung SDI era yafuna diguli eyookubiri okuva mu Samsung Electronics SAIT. Yafuna diguli ye eya bbasale, master, ne doctorate okuva mu kitongole kya Chemistry, Korea Institute of Science and Technology, mu 1990, 1992 ne 1995. Okunoonyereza kwe okuliwo kati kwesigamye ku kukola ebintu ebiziyiza (catalytic materials) okukola enkuŋŋaana z’obusannyalazo bw’olususu mu butoffaali bw’amafuta n’okusengejja amasannyalaze ng’akozesa ebiwanirizi bya kaboni (nanostructured carbon) n’ebyuma ebitabuddwamu okisayidi. Afulumizza empapula za ssaayansi 126 era afunye patent 227 mu mulimu gw’obukugu.
Dr. Chaekyong Baik munoonyereza mu ttendekero lya Korea Institute of Science and Technology (KIST). Yenyigira mu kukola ebirungo ebikola PEMWE OER ne MEA, nga mu kiseera kino essira aliteeka ku bikozesebwa n’ebyuma ebikola enzirukanya y’okuziyiza ammonia. Nga tannaba kwegatta ku KIST mu 2023, Chaekyung Baik yafuna diguli ye eya PhD mu by’okugatta amaanyi okuva mu Gwangju Institute of Science and Technology.
Mesoporous iride nanostructure ewagirwa Ta2O5 erimu obusannyalazo esobola okutumbula emirimu n’obutebenkevu bw’enkola y’enkulaakulana ya oxygen.
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