Mapangidwe apadera a iridium nanostructures omwe amaikidwa pa mesoporous tantalum oxide amawonjezera mphamvu yamagetsi, ntchito yothandiza komanso kukhazikika kwa nthawi yayitali.
Chithunzi: Ofufuza ku South Korea ndi ku US apanga chothandizira chatsopano cha iridium chokhala ndi ntchito yowonjezera ya kusintha kwa okosijeni kuti chithandizire kuyeretsa madzi ndi electrolysis yotsika mtengo pogwiritsa ntchito nembanemba yosinthira ma proton kuti apange hydrogen.
Zosowa za mphamvu padziko lonse lapansi zikupitirira kukula. Mphamvu ya haidrojeni yonyamulika ili ndi lonjezo lalikulu pakufunafuna kwathu mayankho a mphamvu oyera komanso okhazikika. Pachifukwa ichi, ma electrolysers amadzi a pulotoni osinthana ndi membrane (PEMWEs), omwe amasintha mphamvu zamagetsi zochulukirapo kukhala mphamvu ya haidrojeni yonyamulika kudzera mu electrolysis yamadzi, akope chidwi chachikulu. Komabe, kugwiritsidwa ntchito kwake kwakukulu popanga haidrojeni kumakhalabe kochepa chifukwa cha kuchepa kwa kayendedwe ka mpweya (OER), gawo lofunikira la electrolysis, komanso kudzaza kwakukulu kwa ma catalyst okwera mtengo achitsulo monga iridium (Ir) ndi ruthenium oxide mu ma electrodes ndi kochepa. Chifukwa chake, kupanga ma catalyst a OER otsika mtengo komanso ogwira ntchito kwambiri ndikofunikira kuti PEMWE igwiritsidwe ntchito kwambiri.

Posachedwapa, gulu lofufuza la ku Korea-America lotsogozedwa ndi Pulofesa Changho Park wochokera ku Gwangju Institute of Science and Technology ku South Korea linapanga chothandizira chatsopano cha iridium nanostructured chozikidwa pa mesoporous tantalum oxide (Ta2O5) kudzera mu njira yabwino yochepetsera formic acid kuti akwaniritse bwino electrolysis ya madzi a PEM. . Kafukufuku wawo adasindikizidwa pa intaneti pa Meyi 20, 2023, ndipo adzasindikizidwa mu Volume 575 ya Journal of Power Sources pa Ogasiti 15, 2023. Kafukufukuyu adalembedwa ndi Dr. Chaekyong Baik, wofufuza ku Korea Institute of Science and Technology (KIST).
"Kapangidwe ka Ir kamene kali ndi ma elekitironi ambiri kamafalikira mofanana pa substrate yokhazikika ya Ta2O5 yokonzedwa ndi njira yofewa yophatikizidwa ndi njira yozungulira ya ethylenediamine, zomwe zimachepetsa bwino kuchuluka kwa Ir mu batri imodzi ya PEMWE kufika pa 0.3 mg cm-2," anafotokoza Pulofesa Park. . Ndikofunikira kudziwa kuti kapangidwe katsopano ka Ir/Ta2O5 catalyst sikuti kamangowonjezera kugwiritsidwa ntchito kwa Ir kokha, komanso kali ndi mphamvu yoyendetsera bwino komanso malo akuluakulu ogwirira ntchito zamagetsi.
Kuphatikiza apo, X-ray photoelectron ndi X-ray absorption spectroscopy zimasonyeza mgwirizano wamphamvu pakati pa Ir ndi Ta, pomwe kuwerengera kwa density functional theory kumasonyeza kusamutsa kwa mphamvu kuchokera ku Ta kupita ku Ir, zomwe zimayambitsa kumangirira kwamphamvu kwa adsorbates monga O ndi OH, ndikusunga chiŵerengero cha Ir(III) panthawi ya OOP oxidation process. Izi zimapangitsa kuti ntchito ya Ir/Ta2O5 ikhale yowonjezereka, yomwe ili ndi overvoltage yotsika ya 0.385 V poyerekeza ndi 0.48 V ya IrO2.
Gululi linawonetsanso ntchito yayikulu ya OER ya catalyst, powona kuchuluka kwa mphamvu ya 288 ± 3.9 mV pa 10 mA cm-2 ndi kuchuluka kwakukulu kwa mphamvu ya Ir ya 876.1 ± 125.1 A g-1 pa 1.55 V mpaka mtengo wofanana. kwa a Black. Ndipotu, Ir/Ta2O5 ikuwonetsa ntchito yabwino kwambiri ya OER komanso kukhazikika, zomwe zinatsimikiziridwanso ndi maola opitilira 120 a ntchito ya selo limodzi la membrane-electrode assembly.
Njira yomwe ikuperekedwayi ili ndi ubwino wawiri wochepetsa kuchuluka kwa Ir ndikuwonjezera kugwira ntchito bwino kwa OER. "Kugwira ntchito bwino kwa OER kumawonjezera kugwiritsa ntchito bwino ndalama kwa njira ya PEMWE, motero kumawonjezera magwiridwe antchito ake onse. Kupambana kumeneku kungasinthe malonda a PEMWE ndikufulumizitsa kuvomerezedwa kwake ngati njira yayikulu yopangira haidrojeni," akutero Pulofesa Park, yemwe ali ndi chiyembekezo.

Ponseponse, chitukukochi chimatibweretsa pafupi kuti tipeze njira zoyendetsera mphamvu ya haidrojeni yokhazikika komanso kuti tipeze mpweya woipa womwe sunalowerere mpweya.
Zokhudza Gwangju Institute of Science and Technology (GIST) Gwangju Institute of Science and Technology (GIST) ndi yunivesite yofufuza yomwe ili ku Gwangju, South Korea. GIST idakhazikitsidwa mu 1993 ndipo yakhala imodzi mwa masukulu otchuka kwambiri ku South Korea. Yunivesiteyi yadzipereka kupanga malo olimba ofufuzira omwe amalimbikitsa chitukuko cha sayansi ndi ukadaulo komanso kulimbikitsa mgwirizano pakati pa mapulojekiti ofufuza apadziko lonse lapansi ndi akunja. Potsatira mawu akuti "Wopanga Sayansi ndi Ukadaulo Wamtsogolo", GIST nthawi zonse imakhala pakati pa mayunivesite apamwamba kwambiri ku South Korea.
Za Olemba Dr. Changho Park wakhala pulofesa ku Gwangju Institute of Science and Technology (GIST) kuyambira mu Ogasiti 2016. Asanalowe nawo GIST, anali Wachiwiri kwa Purezidenti wa Samsung SDI ndipo adalandira digiri ya Master kuchokera ku Samsung Electronics SAIT. Analandira digiri yake ya bachelor's, master's, ndi doctorate kuchokera ku Dipatimenti ya Chemistry, Korea Institute of Science and Technology, mu 1990, 1992, ndi 1995, motsatana. Kafukufuku wake wapano akuyang'ana kwambiri pakupanga zinthu zothandizira ma electrode a membrane mu maselo amafuta ndi electrolysis pogwiritsa ntchito carbon ndi zitsulo zosakanikirana. Wasindikiza mapepala asayansi 126 ndipo walandira ma patent 227 m'munda wake waukadaulo.
Dr. Chaekyong Baik ndi wofufuza ku Korea Institute of Science and Technology (KIST). Akugwira ntchito yopanga ma catalyst a PEMWE OER ndi MEA, omwe pakadali pano akuyang'ana kwambiri ma catalyst ndi zida zogwiritsira ntchito ammonia oxidation reactions. Asanalowe nawo KIST mu 2023, Chaekyung Baik adalandira PhD yake mu Energy Integration kuchokera ku Gwangju Institute of Science and Technology.
Kapangidwe kake ka mesoporous iride komwe kamathandizidwa ndi Ta2O5 yolemera mu ma elekitironi kumatha kukulitsa ntchito ndi kukhazikika kwa kayendedwe ka mpweya.
Olembawo akunena kuti alibe zokonda zachuma kapena maubwenzi apamtima omwe angawonekere kuti angakhudze ntchito yomwe yaperekedwa m'nkhaniyi.
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