Ethanol oxidation on the ternary Pt–Rh–SnO2/C electrocatalysts with varied Pt:Rh:Sn ratios

Trimetallic catalyst based on PtRu modified by irreversible adsorption of Sb for direct ethanol fuel cells

“…However, with the trimetallic catalyst a power density 2 times higher than that with PtRu/C still achieved. The maximum power per mg of Pt is 13.44 mW and it is in the same range than reported for other trimetallic catalysts [17][18][19][20] obtained by more complicated and expensive synthesis methods (Table 3). In order to check the stability of this modified PtRu/C-Sb catalysts, chronoamperometric curves were obtained at the cell potential of 0.3 V during 1 h at 70º C. The results obtained for PtRu/C and PtRu/CSb are plotted in Figure 7.…”

“…Ternary alloys have also been widely studied recently [17][18][19][20][21][22]. The addition of the third component usually changes the electronic and structural properties of the alloy leading, generally to catalysts with higher activity than their mono and bimetallic precursors.…”

“…The addition of the third component usually changes the electronic and structural properties of the alloy leading, generally to catalysts with higher activity than their mono and bimetallic precursors. Alloys such as PtRuSn [17], PtRhSn [18], PtMoIr [19], PtRuMo [20,21] or PtSnMo [22] have been reported in the literature. In these catalysts, the presence of the oxophilic element in the alloy enhances the water oxidation, leading to the early formation of adsorbed hydroxides which act as oxidants for the strongly adsorbed intermediates.…”

Characterization of nanoparticle electrocatalysts using X-ray absorption spectroscopy

“…Zaista, EXAFS analiza pokazuje da je ukupan koordinacioni [12] Dalji rad sa Pt/Rh/SnO 2 /C usmerili smo ka optimizaciji katalizatora varirajući molski udeo komponenti. Infracrvenom spekroskopijom je pokazano da je najbolji katalizator, odnosno onaj koji daje najveću količinu proizvoda totalne oksidacije (CO 2 ), ima atomski odnos Pt:Rh:Sn = 3:1:4 [11], a XANES spektroskopijom je ustanovljeno da katalizator najbolje radi kada su Pt i Rh u metalnom (nula-valentnom) stanju u celokupnoj oblasti praktične primene gorivih spregova (< 0,6 V) [12]. Intenzitet prvog pika (tradicionalno zvanog "bela linija") je obrnuto srazmeran popunjenosti d-orbitala metala, pa se praćenjem intenziteta bele linije može da otkrije prividno oksidaciono stanje.…”

Activity Enhancement of Tetrahexahedral Pd Nanocrystals by Bi Decoration towards Ethanol Electrooxidation in Alkaline Media

“…Recently, Adzic et al [28][29][30] developed multifunctional ternary PtRhSnO 2 and PtIrRh electrocatalysts, which are highly effective in the splitting of C-C bond in ethanol at room temperature and able to oxidize ethanol to CO 2 at low overpotentials [28][29][30]. Teng and co-workers [31] also reported a series of carbon supported Pd-Sn nanocrystals for ethanol electrooxidation where an enhancement in the activity was attributed to the bifunctional effect of the alloy where Sn or SnO x has stronger interactions with hydroxyl group whilst Pd has excellent properties in the adsorption and dissociation of ethanol.…”