Izakhiwo ezincane ze-iridium eziklanywe ngokukhethekile ezifakwe ku-mesoporous tantalum oxide zithuthukisa ukuhanjiswa kwamandla, umsebenzi we-catalytic kanye nokuzinza kwesikhathi eside.
Isithombe: Abacwaningi eNingizimu Korea nase-US bathuthukise i-catalyst entsha ye-iridium enomsebenzi wokwanda kokusabela kokuvela komoya-mpilo ukuze kube lula ukuhlanza amanzi nge-electrolysis engabizi kakhulu nge-membrane yokushintshana kweproton ukukhiqiza i-hydrogen. Funda kabanzi
Izidingo zamandla emhlabeni ziyaqhubeka nokukhula. Amandla e-hydrogen athwalwayo anesithembiso esikhulu ekufuneni kwethu izixazululo zamandla ahlanzekile nazinzile. Kulokhu, ama-electrolysers amanzi e-proton exchange membrane (ama-PEMWE), aguqula amandla kagesi amaningi abe amandla e-hydrogen athwalwayo ngokusebenzisa i-electrolysis yamanzi, adonsele isithakazelo esikhulu. Kodwa-ke, ukusetshenziswa kwawo okukhulu ekukhiqizweni kwe-hydrogen kusalokhu kulinganiselwe ngenxa yesilinganiso esisheshayo sokusabela kokuvela komoya-mpilo (i-OER), okuyingxenye ebalulekile ye-electrolysis, kanye nokulayishwa okuphezulu kwama-catalyst e-metal oxide abizayo njenge-iridium (Ir) ne-ruthenium oxide kuma-electrode kulinganiselwe. Ngakho-ke, ukuthuthukiswa kwama-catalyst e-OER angabizi futhi asebenza kahle kuyadingeka ukuze kusetshenziswe kabanzi i-PEMWE.

Muva nje, ithimba locwaningo laseKorea-laseMelika eliholwa nguSolwazi Changho Park waseGwangju Institute of Science and Technology eNingizimu Korea lithuthukise i-catalyst entsha ye-iridium nanostructured esekelwe ku-mesoporous tantalum oxide (Ta2O5) ngendlela ethuthukisiwe yokunciphisa i-formic acid ukuze kufezwe i-electrolysis ephumelelayo yamanzi e-PEM. . Ucwaningo lwabo lushicilelwe ku-inthanethi ngoMeyi 20, 2023, futhi luzoshicilelwa kuMqulu 575 we-Journal of Power Sources ngo-Agasti 15, 2023. Lolu cwaningo lubhalwe ngokubambisana nguDkt. Chaekyong Baik, umcwaningi e-Korea Institute of Science and Technology (KIST).
“Isakhiwo se-Ir esicebile ngama-electron sihlakazeke ngokulinganayo ku-substrate ye-Ta2O5 ezinzile elungiselelwe ngendlela yethempulethi ethambile ehlanganiswe nenqubo ezungezile ye-ethylenediamine, enciphisa ngempumelelo okuqukethwe kwe-Ir kwebhethri elilodwa le-PEMWE kube ngu-0.3 mg cm-2,” kuchaza uSolwazi Park. Kubalulekile ukuqaphela ukuthi umklamo omusha we-catalyst ye-Ir/Ta2O5 awuthuthukisi nje kuphela ukusetshenziswa kwe-Ir, kodwa futhi unomoya ophakeme kanye nendawo enkulu esebenza ngogesi.
Ngaphezu kwalokho, i-X-ray photoelectron kanye ne-X-ray absorption spectroscopy zembula ukusebenzisana okuqinile kwensimbi phakathi kwe-Ir ne-Ta, kuyilapho ukubalwa kwethiyori yokusebenza kobuningi kubonisa ukudluliselwa kweshaja kusuka ku-Ta kuya ku-Ir, okubangela ukubopha okuqinile kwama-adsorbates njenge-O ne-OH, futhi kugcina isilinganiso se-Ir(III) ngesikhathi senqubo yokuxiliswa kwe-OOP. Lokhu kuphumela emsebenzini owandisiwe we-Ir/Ta2O5, ene-overvoltage ephansi engu-0.385 V uma kuqhathaniswa ne-0.48 V ye-IrO2.
Ithimba liphinde labonisa ngokuhlola umsebenzi we-OER ophezulu we-catalyst, libona i-overvoltage engu-288 ± 3.9 mV ku-10 mA cm-2 kanye nomsebenzi we-Ir mass ophakeme kakhulu ongu-876.1 ± 125.1 A g-1 ku-1.55 V enanini elihambisanayo. likaMnu. Black. Eqinisweni, i-Ir/Ta2O5 ibonisa umsebenzi we-OER omuhle kakhulu kanye nokuzinza, okwaqinisekiswa futhi ngamahora angaphezu kuka-120 okusebenza kweseli elilodwa kwe-membrane-electrode assembly.
Indlela ehlongozwayo inenzuzo ephindwe kabili yokunciphisa izinga lomthwalo i-Ir nokwandisa ukusebenza kahle kwe-OER. "Ukusebenza kahle okwandisiwe kwe-OER kugcwalisa ukusebenza kahle kwezindleko zenqubo ye-PEMWE, ngaleyo ndlela kuthuthukise ukusebenza kwayo iyonke. Le mpumelelo ingaguqula ukuthengiswa kwe-PEMWE futhi isheshise ukwamukelwa kwayo njengendlela yokukhiqiza i-hydrogen ejwayelekile," kusho uSolwazi Park onethemba.

Sekukonke, lokhu kuthuthuka kusisondeza ekufinyeleleni izixazululo zokuthuthwa kwamandla e-hydrogen eziqhubekayo futhi ngaleyo ndlela sifinyelele isimo sokungathathi hlangothi kwekhabhoni.
Mayelana neGwangju Institute of Science and Technology (GIST) IGwangju Institute of Science and Technology (GIST) iyunivesithi yocwaningo etholakala eGwangju, eNingizimu Korea. I-GIST yasungulwa ngo-1993 futhi isibe ngesinye sezikole ezihlonishwa kakhulu eNingizimu Korea. Le nyuvesi izibophezele ekudaleni indawo yocwaningo eqinile ekhuthaza intuthuko yesayensi nobuchwepheshe futhi ikhuthaze ukubambisana phakathi kwamaphrojekthi ocwaningo lwamazwe ngamazwe nolwasekhaya. Inamathela esiqubulweni esithi “Umklami Oziqhenyayo Wesayensi Nobuchwepheshe Besikhathi Esizayo”, i-GIST ihlala ibalwa phakathi kwamayunivesithi asezingeni eliphezulu eNingizimu Korea.
Mayelana Nababhali UDkt. Changho Park ube nguprofesa eGwangju Institute of Science and Technology (GIST) kusukela ngo-Agasti 2016. Ngaphambi kokujoyina i-GIST, wasebenza njengePhini likaMongameli we-Samsung SDI futhi wathola iziqu ze-Master's kwa-Samsung Electronics SAIT. Wathola iziqu zakhe ze-bachelor's, masters's, kanye ne-doctorate eMnyangweni Wekhemistri, i-Korea Institute of Science and Technology, ngo-1990, 1992, kanye no-1995, ngokulandelana. Ucwaningo lwakhe lwamanje lugxile ekuthuthukisweni kwezinto zokulungisa izinto zokuhlanganisa ama-electrode e-membrane kumaseli kaphethiloli kanye ne-electrolysis esebenzisa i-carbon enama-nanostructured kanye nezisekelo ze-oxide zensimbi exubile. Ushicilele amaphepha esayensi angu-126 futhi wathola amalungelo obunikazi angu-227 emkhakheni wakhe wobuchwepheshe.
UDkt. Chaekyong Baik ungumcwaningi e-Korea Institute of Science and Technology (KIST). Uhilelekile ekuthuthukisweni kwama-catalyst e-PEMWE OER kanye ne-MEA, ngokugxila kwamanje kuma-catalyst kanye namadivayisi okusabela kwe-ammonia oxidation. Ngaphambi kokujoyina i-KIST ngo-2023, uChaekyung Baik wathola i-PhD yakhe ku-Energy Integration evela e-Gwangju Institute of Science and Technology.
Isakhiwo se-nanosoporous iride esisekelwa yi-Ta2O5 ecebile ngama-electron singathuthukisa umsebenzi kanye nokuzinza kokusabela kokuvela komoya-mpilo.
Abalobi bathi abanazo izintshisekelo zezimali ezincintisanayo noma ubudlelwano bomuntu siqu obungase bubonakale buthonya umsebenzi owethulwe kulesi sihloko.
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