Ii-nanostructures ze-iridium eziyilwe ngokukodwa ezifakwe kwi-mesoporous tantalum oxide zonyusa ukuhanjiswa kwamandla, umsebenzi we-catalytic kunye nokuzinza kwexesha elide.
Umfanekiso: Abaphandi eMzantsi Korea nase-US baphuhlise i-catalyst entsha ye-iridium enomsebenzi wokwanda kwe-oxygen evolution reaction ukuze kube lula ukucoca amanzi nge-electrolysis engabizi kakhulu nge-proton exchange membrane ukuvelisa i-hydrogen. Funda ngakumbi
Iimfuno zamandla zehlabathi ziyaqhubeka nokukhula. Amandla e-hydrogen athwalwayo anesithembiso esikhulu ekufuneni kwethu izisombululo zamandla ezicocekileyo nezizinzileyo. Kule meko, ii-electrolysers zamanzi ze-proton exchange membrane (ii-PEMWE), eziguqula amandla ombane agqithisileyo abe ngamandla e-hydrogen athwalwayo nge-electrolysis yamanzi, ziye zatsala umdla omkhulu. Nangona kunjalo, ukusetyenziswa kwayo okukhulu kwimveliso ye-hydrogen kuhlala kulinganiselwe ngenxa yesantya esicothayo se-oxygen evolution reaction (OER), into ebalulekileyo ye-electrolysis, kunye nokulayisha okuphezulu kwee-catalysts ze-metal oxide ezibizayo ezifana ne-iridium (Ir) kunye ne-ruthenium oxide kwii-electrodes kulinganiselwe. . Ke ngoko, uphuhliso lwee-catalysts ze-OER ezingabizi kakhulu nezisebenza kakuhle luyimfuneko ekusetyenzisweni ngokubanzi kwe-PEMWE.

Kutshanje, iqela lophando laseKorea-Amerika elikhokelwa nguNjingalwazi uChangho Park waseGwangju Institute of Science and Technology eMzantsi Korea liphuhlise i-catalyst entsha ye-iridium nanostructured esekelwe kwi-mesoporous tantalum oxide (Ta2O5) ngendlela ephuculweyo yokunciphisa i-formic acid ukuze kufezekiswe i-electrolysis esebenzayo yamanzi e-PEM. . Uphando lwabo lupapashwe kwi-intanethi ngoMeyi 20, 2023, kwaye luza kupapashwa kuMqulu 575 weJournal of Power Sources ngo-Agasti 15, 2023. Olu phononongo lubhalwe ngokubambisana nguGqr. Chaekyong Baik, umphandi kwiKorea Institute of Science and Technology (KIST).
“Isakhiwo se-Ir esityebileyo ngee-electron sisasazwa ngokulinganayo kwi-substrate ye-Ta2O5 ezinzileyo elungiselelwe yindlela ye-template ethambileyo edityaniswe nenkqubo ejikelezileyo ye-ethylenediamine, enciphisa ngempumelelo umxholo we-Ir webhetri enye ye-PEMWE ukuya kwi-0.3 mg cm-2,” ucacise uNjingalwazi uPark. Kubalulekile ukuqaphela ukuba uyilo olutsha lwe-Ir/Ta2O5 catalyst aluphuculi kuphela ukusetyenziswa kwe-Ir, kodwa lukwanokuqhuba okuphezulu kunye nendawo enkulu esebenza nge-electrochemically.
Ukongeza, i-X-ray photoelectron kunye ne-X-ray absorption spectroscopy zibonisa ukusebenzisana okunamandla kwe-metal-support phakathi kwe-Ir kunye ne-Ta, ngelixa ukubalwa kwe-density functional theory kubonisa ukudluliselwa kwetshaja ukusuka kwi-Ta ukuya kwi-Ir, okubangela ukubopha okunamandla kwe-adsorbates ezifana ne-O kunye ne-OH, kwaye kugcina umlinganiselo we-Ir(III) ngexesha lenkqubo ye-OOP oxidation. Oku kuphumela ekwandeni komsebenzi we-Ir/Ta2O5, ene-overvoltage ephantsi ye-0.385 V xa kuthelekiswa ne-0.48 V ye-IrO2.
Iqela likwabonise ngokuvavanya umsebenzi ophezulu we-OER we-catalyst, libona i-overvoltage ye-288 ± 3.9 mV kwi-10 mA cm-2 kunye nomsebenzi ophezulu kakhulu we-Ir mass we-876.1 ± 125.1 A g-1 kwi-1.55 V ukuya kwixabiso elihambelanayo. kuMnu. Black. Enyanisweni, i-Ir/Ta2O5 ibonisa umsebenzi ogqwesileyo we-OER kunye nokuzinza, okwaqinisekiswa ngakumbi ziiyure ezingaphezu kwe-120 zokusebenza kweseli enye ye-membrane-electrode assembly.
Le ndlela icetywayo ineenzuzo ezimbini zokunciphisa inqanaba lomthwalo i-Ir kunye nokwandisa ukusebenza kakuhle kwe-OER. "Ukusebenza kakuhle kwe-OER kuhambelana nokusebenza kakuhle kweendleko zenkqubo ye-PEMWE, ngaloo ndlela kuphucula ukusebenza kwayo iyonke. Le mpumelelo inokuguqula ukuthengiswa kwe-PEMWE kwaye ikhawulezise ukwamkelwa kwayo njengendlela ephambili yokuvelisa i-hydrogen," ucebisa uNjingalwazi Park onethemba.

Lilonke, olu phuhliso lusisondeza ekufezekiseni izisombululo zothutho lwamandla e-hydrogen oluzinzileyo kwaye ngaloo ndlela sifezekise imeko yokungathathi cala kwekhabhoni.
Malunga neGwangju Institute of Science and Technology (GIST) IGwangju Institute of Science and Technology (GIST) yiyunivesithi yophando eseGwangju, eMzantsi Korea. I-GIST yasekwa ngo-1993 kwaye iye yaba yenye yezona zikolo zidumileyo eMzantsi Korea. Le yunivesithi izimisele ekudaleni indawo yophando eqinileyo ekhuthaza uphuhliso lwesayensi netekhnoloji kwaye ikhuthaza intsebenziswano phakathi kweeprojekthi zophando zamazwe ngamazwe nezasekhaya. Ilandela isiqubulo esithi "Umzobi weSayensi neTekhnoloji yeXesha elizayo", i-GIST ihlala ibekwe phakathi kweeyunivesithi eziphambili eMzantsi Korea.
Malunga nababhali UGqr. Changho Park ube nguprofesa kwiGwangju Institute of Science and Technology (GIST) ukusukela ngo-Agasti 2016. Ngaphambi kokuba ajoyine iGIST, wayesebenza njengoSekela Mongameli weSamsung SDI waza wafumana isidanga seMasters kwiSamsung Electronics SAIT. Wafumana izidanga zakhe ze-bachelor's, master's, kunye ne-doctorate kwiSebe leKhemistri, iKorea Institute of Science and Technology, ngo-1990, 1992, nango-1995, ngokulandelelana. Uphando lwakhe lwangoku lugxile kuphuhliso lwezinto ezibangela ukuba kubekho i-membrane electrode assemblies kwiiseli zamafutha kunye ne-electrolysis esebenzisa i-nanostructured carbon kunye ne-mixed metal oxide supports. Upapashe amaphepha esayensi ali-126 kwaye wafumana amalungelo awodwa obunikazi angama-227 kwicandelo lakhe lobuchwephesha.
UDkt. Chaekyong Baik ngumphandi kwiKorea Institute of Science and Technology (KIST). Ubandakanyeka kuphuhliso lwePEMWE OER kunye neMEA catalysts, ngoku egxile kwi-catalysts kunye nezixhobo ze-ammonia oxidation reactions. Ngaphambi kokujoyina iKIST ngo-2023, uChaekyung Baik wafumana iPhD yakhe kwi-Energy Integration kwiGwangju Institute of Science and Technology.
Isakhiwo se-mesoporous iride esixhaswa yi-Ta2O5 etyebileyo kwii-electron sinokuphucula umsebenzi kunye nokuzinza kwempendulo yokuvela kweoksijini.
Ababhali bathi abanazo izilangazelelo zemali ezikhuphisanayo okanye ubudlelwane bomntu obunokubonakala ngathi bunempembelelo kumsebenzi ovezwe kweli nqaku.
Isikhanyeli: I-AAAS kunye ne-EurekAlert! azinaxanduva ngokuchaneka kweengxelo zeendaba ezipapashwe kwi-EurekAlert! Nakuphi na ukusetyenziswa kolwazi ngumbutho othatha inxaxheba okanye ngenkqubo ye-EurekAlert.

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