Sinteza, karakterizacija i elektrohemijske osobine kobaltom dopirane fosfat volframove heteropoli kiseline i njene bronze Naučni rad
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Heteropoli kiseline i njihova jedinjenja su fascinantna klasa multifunkcionalnih materijala koji se koriste u različitim naučnim oblastima: medicini, magnetizmu, katalizi, nelinearnoj optici kao i u elektrohemiji gde se primenjuju kao materijali za baterije. U ovoj studiji je polazna tačka volfram-fosfatna heteropoli kiselina iz koje je sintetisana i karakterisana njena kobaltova so (Co-PWA) i kobaltom dopirana volfram-fosfatna bronza (Co-PWB). Termička analiza je korišćena za određivanje faznog prelaza Co-PWA soli u Co-PWB bronzu koji se odvija na 588 °C. Ova temperatura je korišćena za žarenje Co-PWA da bi se sintetisala Co-PWB. Oba uzorka su dalje karakterisana korišćenjem infracrvene spektroskopije sa Furijeovom transformacijom (engl. Fourier transform infrared spectroscopy), difrakcije rendgenskih zraka na prahu (engl. X-ray powder diffraction) i skenirajuće elektronske mikroskopije koja sadrži energetsku disperzivnu rendgensku spektroskopiju (engl. scanning electron microscopy using an energy dispersive X-ray spectroscopy), kao i korišćenjem elektrohemijskih ispitivanja. Prisustvo kobalta je nedvosmisleno pokazano i u Co-PWA i Co-PWB, pri cemu je potvrdjeno uspešno dopiranje. Za elektrohemijska ispitivanja korišćene su ciklična voltametrija kao “brza” tehnika i metoda hronopotenciometrije radi simuliranja punjenja i pražnjenja baterije. Ciklična voltametrija je izmerila nestabilan i mali kapacitet za Co-PWA i stabilan za Co-PWB u vodenom rastvoru LiNO3. Razlog pada kapaciteta kod Co-PWA je nestabilnost ove soli u navedenom elektrolitu. Zbog stabilnog kapaciteta Co-PWB dobijenim merenjem cikličnom voltametrijom, ovaj material je podvrgnut hronopotenciometrijskom punjenju i pražnjenju pri strujama 1000, 2000 i 3000 mA g-1. Ovom metodom je pokazan stabilan kapacitet pri svakoj od primenjenih struja, što ga čini atraktivnim elektrodnim materijalom za vodene Li-jonske baterije. Dobijeni rezultati dopunjuju naučnu literaturu koja se bavi ispitivanjem sličnih materijala i doprinose boljem razumevanju karakteristika dopiranih kiselina i njihovih bronzi različitim metalima.
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Ministarstvo Prosvete, Nauke i Tehnološkog Razvoja
Grant numbers 451-03-66/2024-03/200026;451-03-66/2024-03/200051;451-03-66/2024-03/200146;451-03-65/2024-03/200126 -
HORIZON EUROPE European Innovation Council
Grant numbers 101115149 -
Office of Naval Research Global
Grant numbers N62902-22-1-2024
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