Tintfo letincane te-iridium letakhiwe ngalokukhetsekile letifakwe ku-mesoporous tantalum oxide tikhutsata kudvonsa, umsebenti we-catalytic kanye nekusimama kwesikhatsi lesidze.
Sitfombe: Bacwaningi baseNingizimu Korea nase-US batfutfukise i-iridium catalyst lensha lenemsebenti wekuphendvula wekugucuka kwemoya-mpilo lokhulisiwe kute kube lula kwenta emanti nge-electrolysis lengabiti kakhulu nge-membrane yekushintjana nge-proton kute kukhicitwe i-hydrogen. fundza kabanti
Tidzingo temandla emhlabeni tiyachubeka tikhula. Emandla e-hydrogen latfutsekako aphetse litsemba lelikhulu ekufuneni kwetfu tisombululo temandla lahlobile naletisimeme. Kuloku, ema-electrolysers emanti lashintja ema-proton (ema-PEMWE), lagucula emandla agezi langetulu abe ngemandla e-hydrogen lahanjiswako ngekusebentisa ema-electrolysis emanti, akhanga inshisekelo lenkhulu. Nomakunjalo, kusetjentiswa kwayo ngesikali lesikhulu ekukhiciteni i-hydrogen kuhlala kuncane ngenca yelizinga lelihamba kancane lekugucuka kwemoya-mpilo (i-OER), incenye lebalulekile ye-electrolysis, kanye nekulayisha lokusetulu kwetintfo letibita kakhulu te-oxide yensimbi njenge-iridium (Ir) kanye ne-ruthenium oxide kuma-electrode kuncane. . Ngako-ke, kutfutfukiswa kwetintfo letibitako naletisebenta kahle kakhulu te-OER kuyadzingeka ekusetjentisweni lokukhulu kwe-PEMWE.

Muva nje, licembu lelucwaningo laseKorea-Melika leliholwa nguSolwazi Changho Park waseGwangju Sikhungu Sesayensi Netebucwepheshe eNingizimu Korea latfutfukisa umkhutsati lomusha we-iridium nanostructured losekelwe ku-mesoporous tantalum oxide (Ta2O5) ngendlela lephucukile yekunciphisa i-ecidi ye-formic kute kuzuzwe i-electrolysis lephumelelako ye-PEM wa. . Lucwaningo lwabo lwashicilelwa ku-inthanethi ngaMay 20, 2023, futsi lutawushicilelwa ku-Volumu 575 we-Journal of Power Sources nga-August 15, 2023. Lolucwaningo lwabhalwa nguDkt.
“Lesakhiwo se-Ir lesicebile nge-electron sisakateke ngendlela lefanako endzaweni lecinile ye-mesoporous Ta2O5 lelungiselelwe indlela yesifanekiso lethambile lehlanganiswe nenchubo letungeletile ye-ethylenediamine, lenciphisa ngemphumelelo lokucuketfwe yi-Ir yebhethri yinye ye-PEMWE ibe ngu-0.3 mg cm-2,” kuchaza Solwati Park. . Kubalulekile kucaphela kutsi umklamo lomusha we-Ir/Ta2O5 catalyst awugcini nje ngekutfutfukisa kusetjentiswa kwe-Ir, kepha futsi unekucondzisa lokusetulu kanye nendzawo lenkhulu lesebentako ye-electrochemical.
Ngetulu kwaloko, i-X-ray photoelectron kanye ne-X-ray yekutsatsa spectroscopy kuveta kusebentisana lokucinile kwensimbi-yekusekela emkhatsini we-Ir ne-Ta, kantsi tibalo te-theory lesebentako ye-density tikhombisa kudluliselwa kwekushaja kusuka ku-Ta kuya ku-Ir, lokubangela kubopha lokucinile kwe-adsorbates njenge-O ne-OH, futsi kugcina inchubo ye-O-oxidation. Loku kuphindze kuphumela ekukhuleni kwemsebenti we Ir/Ta2O5, lenemandla laphansi e-0.385 V uma kucatsaniswa ne-0.48 V ye-IrO2.
Lelicembu laphindze lakhombisa ngekulinga umsebenti we-OER lophakeme we-catalyst, labuka i-overvoltage lengetulu kwa-288 ± 3.9 mV ku-10 mA cm-2 kanye nemsebenti we-Ir mass lophakeme kakhulu we-876.1 ± 125.1 A g-1 ku-1.55 V kuya enanini lelihambisanako. kuMnumzane Black. Empeleni, Ir / Ta2O5 ukhombisa umsebenti lomuhle kakhulu we-OER kanye nekusimama, lokuphindze kwacinisekiswa ngemahora langetulu kwa-120 ekusebenta kweseli linye lemhlangano we-membrane-electrode.
Indlela lephakanyisiwe inetinzuzo letimbili tekunciphisa lizinga lemtfwalo Ir kanye nekwandzisa kusebenta kahle kwe-OER. "Kusebenta kahle lokunyenti kwe-OER kuphelelisa kusebenta kahle kwetindleko tenchubo ye-PEMWE, ngaleyo ndlela kwenta ncono kusebenta kwayo jikelele. Lokufezeka kungagucula kutsengisa kwe-PEMWE futsi kusheshise kwemukelwa kwayo njengendlela levamile yekukhicita i-hydrogen," kusikisela Solwati Park lonelitsemba. .

Sekukonkhe, lentfutfuko isisondzeta ekuzuzeni tisombululo tekutfutsa emandla e-hydrogen letisimeme futsi ngaleyo ndlela sizuze simo sekungatsatsi luhlangotsi ku-carbon.
Mayelana neGwangju Sikhungo Sesayensi Netebucwepheshe (GIST) Gwangju Sikhungo Sesayensi Netebucwepheshe (GIST) yinyuvesi yelucwaningo leseGwangju, eNingizimu Korea. I-GIST yasungulwa nga-1993 futsi seyibe ngulesinye setikolwa letihlonishwa kakhulu eNingizimu Korea. Lenyuvesi itimisele kwenta simo selucwaningo lesicinile lesikhutsata kutfutfukiswa kwesayensi netebucwepheshe futsi sikhutsate kubambisana emkhatsini wemaphrojekthi elucwaningo emave emhlaba nalasekhaya. Ngekunamatsela esicubulweni lesitsi “Umbumba Lotigcabhako Wesayensi Netebucwepheshe Belikusasa”, i-GIST ihlala ibekwa emkhatsini wemanyuvesi lasetulu eNingizimu Korea.
Mayelana neBabhali Dokotela Changho Park bekanguprofesa eSikhungweni Sesayensi Netebucwepheshe saseGwangju (i-GIST) kusukela nga-Agasti 2016. Ngaphambi kwekutsi ajoyine i-GIST, bekasebenta njengeSekela Mengameli we-Samsung SDI futsi watfola sicu se-Master ku-Samsung Electronics SAIT. Watfola ticu takhe tekucala, te-master, kanye netebudokotela eLitiko Lemakhemikhali, eSikhungweni Sesayensi Netebucwepheshe saseKorea, nga-1990, 1992, na-1995, ngekulandzelana. Lucwaningo lwakhe lwanyalo lugcile ekutfutfukiseni tintfo letikhutsatako tekuhlanganiswa kwe-electrode yelucwencwe kumaseli ephethiloli kanye ne-electrolysis kusetjentiswa i-carbon lenesakhiwo se-nano kanye netisekelo te-oxide yensimbi lehlanganisiwe. Ushicilele emaphepha esayensi langu-126 futsi utfole emalungelo ekwakha langu-227 emkhakheni wakhe webungcweti.
Dokotela Chaekyong Baik ungumcwaningi eSikhungweni Sesayensi Netebucwepheshe saseKorea (i-KIST). Uyabandzakanyeka ekwakhiweni kwetintfo letikhutsatako te-PEMWE OER kanye ne-MEA, ngekugcila kwanyalo kuma-catalysts kanye netintfo tekusebenta kwe-ammonia oxidation. Ngaphambi kwekutsi ajoyine i-KIST nga-2023, Chaekyung Baik utfole i-PhD yakhe ekuhlanganisweni kwemandla eSikhungweni Sesayensi Netebucwepheshe saseGwangju.
Lesakhiwo se-iride se-mesoporous lesisekelwa yi-Ta2O5 lecebile nge-electron singakhulisa umsebenti kanye nekusimama kwekuphendvula kwekutigucukela kwemvelo kwemoya-mpilo.
Lababhali bamemetela kutsi abanato tintfo letatiwako letincintisanako tetimali noma budlelwane bebantfu lebebungabonakala bunemtselela emsebentini lowetfulwe kulesihloko.
Kukhuluma: AAAS kanye ne-EurekAlert! ababophekile ngekunemba kwetindzaba letishicilelwe ku-EurekAlert! Noma ngukuphi kusetjentiswa kwelwatiso yinhlangano lehlanganyelako noma ngeluhlelo lwe-EurekAlert.

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