Ithimba locwaningo laseJalimane lithuthukise ama-supercrystal amabili anezinhlangothi ezimbili anezakhiwo ezinhle kakhulu zokulungisa. Angasetshenziswa ukukhiqiza i-hydrogen ngokubolisa i-formic acid, ngemiphumela eqopha umlando.
Ososayensi abaholwa yiLudwig Maximilian University of Munich (LMU Munich) eJalimane bathuthukise ubuchwepheshe be-photocatalytic bokukhiqizwa kwe-hydrogen ngokusekelwe kuma-supercrystals e-plasma bimetallic amabili-dimensional.
Abacwaningi bahlanganise izakhiwo ze-plasmonic ngokuhlanganisa izinhlayiya zegolide ngazinye (ama-AuNP) kanye nezinhlayiya ze-platinum (ama-PtNP).
Umcwaningi u-Emiliano Cortes uthe: “Ukuhlelwa kwezinhlayiya ezincane zegolide kuphumelela kakhulu ekugxiliseni ukukhanya kwezehlakalo nasekukhiqizeni amasimu kagesi aqinile endawo, okuthiwa ama-hot spots, akha phakathi kwezinhlayiya zegolide.”
Ekucushweni kwesistimu okuhlongozwayo, ukukhanya okubonakalayo kuxhumana kakhulu nama-electron asensimbini futhi kubangele ukuthi adlidlize ngokuzwakalayo, okwenza ama-electron ahambe ngokushesha ndawonye esuka kolunye uhlangothi lwe-nanoparticle aye kolunye. Lokhu kudala i-magnet encane ochwepheshe abayibiza ngokuthi i-dipole moment.
Kungumkhiqizo wobukhulu beshaja kanye nebanga eliphakathi kwezikhungo zeshaja ezinhle nezimbi. Uma lokhu kwenzeka, ama-nanoparticles abamba ukukhanya kwelanga okwengeziwe bese ekuguqula kube ama-electron anamandla kakhulu. Asiza ekulawuleni ukusabela kwamakhemikhali.
Umphakathi wezemfundo uhlole ukusebenza kahle kwama-supercrystal e-plasmonic bimetallic 2D ekuboleni i-formic acid.
“Ukusabela kwe-probe kukhethwe ngoba igolide alisabela kahle kune-platinum futhi ngoba liyi-carrier ye-H2 engenawo ugesi,” kusho bona.
“Ukusebenza okuthuthukisiwe kokuhlolwa kweplatinum ngaphansi kokukhanya kusikisela ukuthi ukusebenzisana kokukhanya okubangelwa yizigameko ne-gold array kuphumela ekwakhekeni kweplatinum ngaphansi kogesi,” kusho bona. “Ngempela, lapho i-formic acid isetshenziswa njengesithwali se-H2, ama-AuPt supercrystals abonakala esebenza kahle kakhulu nge-plasma.”
Ikristalu ibonise izinga lokukhiqizwa kwe-H2 elingu-139 mmol ngegremu ngayinye ye-catalyst ngehora. Ithimba locwaningo lithe lokhu kusho ukuthi izinto ezisebenzisa i-photocatalytic manje ziphethe irekhodi lomhlaba lokukhiqiza i-hydrogen ngokususa i-formic acid ngaphansi kwethonya lokukhanya okubonakalayo kanye nemisebe yelanga.
Ososayensi baphakamisa ikhambi elisha ephepheni elithi “Plasmonic bimetallic 2D supercrystals for hydrogen generation,” elisanda kushicilelwa ephephabhukwini i-Nature Catalice. Ithimba lihlanganisa abacwaningi abavela eFree University of Berlin, eNyuvesi yaseHamburg kanye naseNyuvesi yasePotsdam.
“Ngokuhlanganisa ama-plasmon nezinsimbi ezibangela ukwakheka kwegesi, sithuthukisa ukuthuthukiswa kwama-photocatalyst anamandla okusetshenziswa kwezimboni. Lena indlela entsha yokusebenzisa ukukhanya kwelanga futhi inamandla okusabela kwezinye izindlela, njengokuguqula i-carbon dioxide ibe izinto eziwusizo,” kusho uCole Thes.
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