Deng espesyal a dinisenyung iridium nanostructures a makadepositu keng mesoporous tantalum oxide papaslag da ing conductivity, catalytic activity ampo ing long-term stability.
Larawan: Deng talapanaliksik keng South Korea ampo ing US ginawa lang bayung iridium catalyst a maki mas maragul a oxygen evolution reaction activity para asikasu ing cost-effective electrolysis ning danum gamit ing proton exchange membrane para makagawa hydrogen. dakal pang abalu
Ing pamangailangan ning enerhiya ning yatu patuloy yang daragul. Ing transportable hydrogen energy atin yang maragul a pangaku keng kekatamung pamanintun para keng malinis ampo sustainable a solusyun keng enerhiya. keng bage ayni, deng proton exchange membrane water electrolysers (PEMWEs), na mag convert keng sobrang electrical energy keng transportable hydrogen energy kapamilatan ning water electrolysis, mika maragul lang interes. Makanyan man, ing kayang maragul a aplikasyun keng pamaglalang hydrogen manatili yang limitadu pauli ning mabagal a rate ning oxygen evolution reaction (OER), metung a importanting sangkap ning electrolysis, ampo ing matas a pamagkarga kareng mamasang metal oxide catalysts antimo ing iridium (Ir) ampo ing ruthenium oxide kareng electrodes limitadu ya. . Uli na niti, ing pamaglalang kareng cost-effective ampo high-performance OER catalysts kailangan ya para keng malawak a aplikasyun ning PEMWE.

Bayu-bayu pa mu, ing metung a Korean-American research team a panimunan nang Professor Changho Park ibat king Gwangju Institute of Science and Technology king Mauling Korea ginawa yang bayung iridium nanostructured catalyst base king mesoporous tantalum oxide (Ta2O5) kapamilatan ning metung a mas masanting a paralan ning pamagbawas king formic acid bang akwa ing efficient a electrolysis ning PEM a danum. . Ing karelang pamanyaliksik mibulalag ya online inyang Mayu 20, 2023, at mibulalag ya king Volume 575 ning Journal of Power Sources inyang Agostu 15, 2023. Ing pamagaral metung yang co-author nang Dr. Chaekyong Baik, metung a talapanaliksik king Korea Institute of Science and Technology (KIST).
"Ing electron-rich Ir nanostructure pare-pareu yang mikalat keng metung a matatag a mesoporous Ta2O5 substrate a mesadya ning soft template method a kayabe ning ethylenediamine surrounding process, na epektibung makabawas keng Ir content ning metung a PEMWE battery keng 0.3 mg cm-2," paliwanag nang Professor Park. . Importanti ing papansinan na ing makabayung disenyu ning Ir/Ta2O5 catalyst e mu kabud magpasanting king pamangamit king Ir, nune atin yang mas matas a conductivity ampo mas maragul a electrochemically active surface area.
Dagdag pa, ing X-ray photoelectron ampo ing X-ray absorption spectroscopy papakit da ing masikan a metal-support interactions pilatan ning Ir ampo ing Ta, kabang deng kalkulasyun ning density functional theory papakit da ing pamaglipat ning charge ibat king Ta papunta king Ir, a magdalang masikan a pamagtali kareng adsorbates antimo ing O ampong OH, at magpanatili king Ir(III) ratio kabang ing prosesu ning OOP oxidation. Iti naman magresulta ya keng mas matas a aktibidad ning Ir/Ta2O5, na atin mas mababang overvoltage a 0.385 V kumpara keng 0.48 V para keng IrO2.
Ing grupu pepakit na ing matas a OER activity ning catalyst, a menakit king overvoltage a 288 ± 3.9 mV king 10 mA cm-2 ampo ing makabaldugan a matas a Ir mass activity a 876.1 ± 125.1 A g-1 king 1.55 V king katumbas a ulaga. para kang Mr. Black. Ing tutu na niti, ing Ir/Ta2O5 magpakit yang masanting a OER activity ampo katatagan, na lalu pang mekumpirma keng maigit 120 oras ning single-cell operation ning membrane-electrode assembly.
Ing mipanukalang paralan atin yang adwang bentahe keng pamagbawas keng load level Ir ampo pamagdake keng efficiency ning OER. "Ing mas maragul a kahusayan ning OER makadagdag ya keng kahusayan ning gastus ning prosesu ning PEMWE, inya sa't mas masanting ing kayang kabilugan a pamagganaka. Ing tagumpe ayni malyari yang magbayu king pamaglako ning PEMWE at magpabilis king kayang pamag-adoptar bilang metung a mainstream a paralan ning pamaglalang hydrogen," ing pamagsuggest ning metung a optimistic a Professor Park. .

Ing kabilugan, ining panyulung ayni lalapit na katamu keng pamag-achieve sustainable hydrogen energy transport solutions at makanyan ing pamag-achieve ning carbon neutral status.
tungkul keng Gwangju Institute of Science and Technology (GIST) Ing Gwangju Institute of Science and Technology (GIST) metung yang unibersidad a pamanyaliksik atiu keng Gwangju, Mauling Korea. Ing GIST mitatag ya inyang 1993 at meging metung ya kareng peka prestihiyosung pipagaralan king Mauling Korea. Ing unibersidad magkumpisal yang gawang masikan a kapaligiran ning pamanyaliksik a magpasikan king panyulung ning siyensya at teknolohiya at magpasikan king pamisanmetung da reng proyektung pamanyaliksik a internasyunal ampong domestic. Ing pamagsunod keng motto a "Proud Shaper of Science and Technology of the Future", ing GIST parati yang maka-ranggo kareng pekamatas a unibersidad keng South Korea.
tungkul kareng talasulat i Dr. Changho Park metung yang professor keng Gwangju Institute of Science and Technology (GIST) manibat inyang Agosto 2016. Bayu ya linub keng GIST, meging Vice President ne ning Samsung SDI ampo tinggap ne ing Master's degree ibat keng Samsung Electronics SAIT. Tinggap ne ing kayang bachelor's, master's, ampong doctorate degrees ibat king Department of Chemistry, Korea Institute of Science and Technology, kanitang 1990, 1992, ampong 1995, agpang kareti. Ing kayang kasalukuyan a pamanyaliksik tutukan ne ing pamaglalang kareng catalytic a materyales para kareng membrane electrode assemblies kareng fuel cells ampo electrolysis gamit ing nanostructured carbon ampo mixed metal oxide supports. Milimbag yang 126 scientific papers ampo 227 patents keng kayang field of expertise.
I Dr. Chaekyong Baik metung yang talapanaliksik keng Korea Institute of Science and Technology (KIST). Kayabe ya keng pamaglalang ning PEMWE OER ampo MEA catalysts, a maki focus ngeni kareng catalysts ampo devices para kareng ammonia oxidation reactions. Bayu ya linub keng KIST keng 2023, i Chaekyung Baik tinggap ne ing kayang PhD keng Energy Integration ibat keng Gwangju Institute of Science and Technology.
Ing mesoporous iride nanostructure a suportado ning electron-rich Ta2O5 malyari yang magpasanting king aktibidad at katatagan ning oxygen evolution reaction.
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