Reakcija redukcije kiseonika na elektrohemijski istaloženim tankim slojevima platine na (Nb-Ti)2AlC nosaču
DOI:
https://doi.org/10.5937/zasmat2202153PKljučne reči:
elekrohemijsko taloženje Pt, redukcija kiseonika, sumporna kiselinaApstrakt
Ispitivana je reakcija redukcije kiseonika na tankim slojevima platine u 0.5 mol dm-3 H2SO4. Tanki slojevi platine - čija količina naelektrisanja odgovara 10, 30 i 100 teorijskih monoslojeva Pt su istaloženi na nosaču od (Nb-Ti)2AlC. Za elektrohemijsko taloženje je korišćen rastvor 3 mM K2PtCl4 + 0.5 M NaCl pH = 4, u uslovima konvektivne difuzije (RPM = 400) primenom metode linearne skenirajuće voltametrije (LSV) pri brzini promene potencijala od 2 mV s-1 . Elektrohemijski dobijeni platinski katalizatori na pomenutom nosaču su okarakterisani metodom fotoelektronske spektroskopija X-zraka (XPS), kao i elektrohemijskim tehnikama. Za određivanje realne elektrohemijski aktivne površine elektrode je primenjena ciklična voltametrija, integracijom ispod anodnog dela voltamograma u oblasti adsorpcije vodonika na potpotencijalima. Za ispitivanje kinetike reakcije redukcije kiseonika je korišćena metoda linearne skenirajuće voltametrije na rotirajućoj disk elektrodi. Dobijene su dve vrednosti Tafelovog nagiba, jedna približno 60 mV dek-1 u oblasti malih prenapetosti, a druga ~ 120 mV dek-1 , u oblasti većih gustina struje. Katalitička aktivnost katalizatora je poređena sa vrednostima iz literature dobijenim na platini na ugljeničim nosačima na 0.85 V prema reverzibilnoj vodoničnoj elektrodi, izražena kao kinetička gustina struje po realnoj površini electrode, ili specifična aktivnost - izražena kao kinetička gustina struje po masi platine. Pokazano je da katalizator sa 10 monoslojeva platine poseduje veoma dobru katalitičku aktivnost, posebno izraženu po masi istaložene platine.Reference
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