Imiterere ya iridium nanostructures yakozwe mu buryo bwihariye ishyirwa kuri mesoporous tantalum oxide yongera imikorere y’amashanyarazi, imikorere ya catalytic ndetse no kugumana ubusugire bw’igihe kirekire.
Ishusho: Abashakashatsi bo muri Koreya y'Epfo na Amerika bakoze catalyst nshya ya iridium ifite imikorere yo kwiyongera kwa ogisijeni kugira ngo yorohereze electrolysis y'amazi ku giciro gito hakoreshejwe membrane ya proton exchange kugira ngo ikore hydrogen. Menya byinshi.
Ibikenewe ku ngufu ku isi bikomeje kwiyongera. Ingufu za hydrogen zitwara abantu zifite icyizere gikomeye mu gushaka ibisubizo by'ingufu zisukuye kandi zirambye. Muri urwo rwego, electrolysers za membrane ya proton exchange (PEMWEs), zihindura ingufu z'amashanyarazi zirenze urugero mu ngufu za hydrogen zitwara abantu binyuze mu ngufu za electrolysis y'amazi, zakuruye abantu benshi. Ariko, ikoreshwa ryazo rinini mu gukora hydrogen riracyari rike bitewe n'umuvuduko muto w'ihindagurika rya ogisijeni (OER), igice cy'ingenzi cya electrolysis, kandi kwiyongera cyane kwa catalysts z'icyuma zihenze nka iridium (Ir) na ruthenium oxide muri electrodes ni bike. Kubwibyo, iterambere rya catalysts za OER zihendutse kandi zikora neza ni ngombwa kugira ngo PEMWE ikoreshwe hose.

Vuba aha, itsinda ry’abashakashatsi b’Abanyamerika b’Abanyakoreya riyobowe na Porofeseri Changho Park wo mu Kigo cya Gwangju cy’Ubumenyi n’Ikoranabuhanga muri Koreya y’Epfo ryakoze catalyst nshya ya iridium nanostructured ishingiye kuri mesoporous tantalum oxide (Ta2O5) binyuze mu buryo bwiza bwo kugabanya aside formic kugira ngo haboneke electrolysis nziza y’amazi ya PEM. Ubushakashatsi bwabo bwasohotse kuri interineti ku ya 20 Gicurasi 2023, kandi buzasohoka mu Mubumbe wa 575 w’Ikinyamakuru cy’Inkomoko z’Ingufu ku ya 15 Kanama 2023. Ubushakashatsi bwanditswe na Dr. Chaekyong Baik, umushakashatsi mu Kigo cya Koreya cy’Ubumenyi n’Ikoranabuhanga (KIST).
“Imiterere ya Ir ikunzwe na electron ikwirakwizwa neza ku gice cy’inyuma cya Ta2O5 gikozwe mu buryo bworoshye hamwe n’uburyo bwa ethylenediamine buyikikije, ibyo bigabanya neza ingano ya Ir muri batiri imwe ya PEMWE kugeza kuri 0.3 mg cm-2,” nk’uko Porofeseri Park yabisobanuye. Ni ngombwa kumenya ko igishushanyo mbonera gishya cya catalyst ya Ir/Ta2O5 kitanoza gusa ikoreshwa rya Ir, ahubwo kinagira ubushobozi bwo gutwara Ir cyane ndetse n’ubuso bunini bukora neza mu buryo bw’amashanyarazi.
Byongeye kandi, fotoelectron ya X-ray na spectroscopy yo gufata X-ray bigaragaza imikoranire ikomeye hagati ya Ir na Ta, mu gihe imibare y’imikorere y’ubucucike igaragaza ko umuriro uva kuri Ta ujya kuri Ir, bigatuma habaho gufatana gukomeye kwa adsorbates nka O na OH, kandi bigakomeza igipimo cya Ir (III) mu gihe cyo gusohora OOP. Ibi bituma ibikorwa bya Ir/Ta2O5 byiyongera, ifite voltage iri hasi ya 0.385 V ugereranije na 0.48 V kuri IrO2.
Itsinda ryagaragaje kandi mu buryo bw'igerageza imikorere ya OER nyinshi ya catalyst, ribona imbaraga nyinshi za 288 ± 3.9 mV kuri 10 mA cm-2 n'imbaraga nyinshi za Ir za 876.1 ± 125.1 A g-1 kuri 1.55 V ku gipimo gihuye nacyo kuri Bwana Black. Mu by'ukuri, Ir/Ta2O5 igaragaza imbaraga nziza za OER n'ubudahangarwa, byanemejwe kandi n'amasaha arenga 120 y'imikorere y'uturemangingo kamwe k'itsinda rya membrane-electrode.
Ubu buryo bwatanzwe bufite inyungu ebyiri zo kugabanya urugero rw'umutwaro wa Ir no kongera ubushobozi bwa OER. "Ubushobozi bwo kwiyongera bwa OER bwuzuzanya n'ubushobozi bwo gukoresha PEMWE, bityo bikanoza imikorere yayo muri rusange. Iyi ntambwe ishobora guhindura ubucuruzi bwa PEMWE no kwihutisha ikoreshwa ryayo nk'uburyo busanzwe bwo gukora hydrogen," Porofeseri Park, ufite icyizere, arabivuga.

Muri rusange, iri terambere ritwegereza kugera ku bisubizo birambye byo gutwara ingufu za hydrogen bityo tukagera ku rwego rwo kutagira karuboni.
Ku bijyanye n'Ikigo cya Gwangju cy'Ubumenyi n'Ikoranabuhanga (GIST) Ikigo cya Gwangju cy'Ubumenyi n'Ikoranabuhanga (GIST) ni kaminuza y'ubushakashatsi iherereye i Gwangju, muri Koreya y'Epfo. GIST yashinzwe mu 1993 kandi yabaye imwe mu mashuri akomeye muri Koreya y'Epfo. Iyi kaminuza yiyemeje gushyiraho ahantu hakomeye h'ubushakashatsi buteza imbere iterambere rya siyansi n'ikoranabuhanga no guteza imbere ubufatanye hagati y'imishinga y'ubushakashatsi mpuzamahanga n'iy'imbere mu gihugu. Ikurikije intego igira iti "Ishema mu gushushanya siyansi n'ikoranabuhanga ry'ejo hazaza", GIST ihora iri mu za kaminuza zikomeye muri Koreya y'Epfo.
Ku byerekeye Abanditsi Dr. Changho Park yabaye umwarimu mu Ishuri Rikuru rya Gwangju ry’Ubumenyi n’Ikoranabuhanga (GIST) kuva muri Kanama 2016. Mbere yo kwinjira muri GIST, yabaye Visi Perezida wa Samsung SDI kandi yabonye impamyabumenyi y’icyiciro cya kabiri cya kaminuza muri Samsung Electronics SAIT. Yabonye impamyabumenyi ye ya kaminuza, iya kabiri cya kaminuza, n’iya dogitora mu Ishami ry’Ubutabire, Ikigo cya Koreya cy’Ubumenyi n’Ikoranabuhanga, mu 1990, 1992, na 1995. Ubushakashatsi bwe buriho bwibanze ku iterambere ry’ibikoresho bya catalytic byo guteranya electrode mu turemangingo twa lisansi no muri electrolysis hakoreshejwe nanostructured carbon na mixed metal oxide supports. Yasohoye inyandiko 126 za siyansi kandi yahawe patenti 227 mu rwego rw’ubuhanga bwe.
Dr. Chaekyong Baik ni umushakashatsi mu Ishuri Rikuru ry’Ubumenyi n’Ikoranabuhanga rya Koreya (KIST). Agira uruhare mu iterambere rya PEMWE OER na MEA catalysts, aho ubu yibanda ku mashini zikora catalysts n’ibikoresho byo gukora oxidation ya ammonia. Mbere yo kwinjira muri KIST mu 2023, Chaekyung Baik yabonye impamyabumenyi y’ikirenga mu bijyanye no guhuza ingufu (PhD) yakuye mu Ishuri Rikuru ry’Ubumenyi n’Ikoranabuhanga rya Gwangju.
Imiterere ya nanosoporous iride ishyigikiwe na Ta2O5 ikunzwe na electron ishobora kongera imikorere n'ubudahangarwa bw'imikorere ya ogisijeni.
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