Composition effect of oxygen reduction reaction on PtSn nanorods: An experimental and computational study

PtAuSn Nanorod Catalysts with a Beneficial Core/Shell Structure for Oxygen Reduction Electrocatalysis

“…Therefore, the catalysts have lower oxophilicity and less empty d bands of surface Pt, improving the performance. 28,35 Moreover, the promotional effect of the Pt−AuSnO x catalyst may be attributed to the surface Pt nudity and great crystallinity, favorably enhancing the ORR activity, which can be observed by XRD patterns. 36 The electrochemical stabilities of the Pt and Pt-based NRs catalysts are investigated by the ADT as displayed in Figures 4b,c and S4.…”

“…The Pt–Au@SnO x NRs have limited change in the aspect ratio during ADT, suggesting that the decoration of the Sn shell and the Au inner layer on Pt prepared by a sequential reduction not only can prevent the morphologies from shortening and corrosion but also may promote the durability during ADTs. It has been reported that the surface Sn-containing oxides or hydrides produce the repulsion force with OH and O on Pt so that the oxidation of Pt can be inhibited and the stability of catalysts can be promoted. , …”

“…It has been reported that when PtSn catalysts are under ORR operation, Sn has strong bonding with surface OCS, which can weaken the oxophilicity of surface Pt and improve the activity , because Sn addition can induce the lateral repulsion between surface OCS and oxides. Therefore, the catalysts have lower oxophilicity and less empty d bands of surface Pt, improving the performance. , Moreover, the promotional effect of the Pt–AuSnO x catalyst may be attributed to the surface Pt nudity and great crystallinity, favorably enhancing the ORR activity, which can be observed by XRD patterns . The electrochemical stabilities of the Pt and Pt-based NRs catalysts are investigated by the ADT as displayed in Figures b,c and S4.…”

“…It has been reported that the surface Sn-containing oxides or hydrides produce the repulsion force with OH and O on Pt so that the oxidation of Pt can be inhibited and the stability of catalysts can be promoted. 28,35 Moreover, AC-STEM combined with EDX was performed to reveal detailed structures of these Pt-based binary and ternary catalysts. Figure 1 shows typical HAADF−STEM images of PtAu, PtSn, Pt−AuSnO x , and Pt−Au@SnO x catalysts.…”

Optimization of Pt–Oxygen-Containing Species Anodes for Ethanol Oxidation Reaction: High Performance of Pt-AuSnOx Electrocatalyst

“…The EOR activity of various Pt-OCS electrodes (OCS = SnO, CoO, NiO, CuO, RhO, PdO, IrO, and AuO) can be justified from the DFT calculations of hydrogen adsorption energy, E ads (H), which is related to the stabilization of hydrogen from the dehydrogenation steps of ethanol in its partial oxidation processes, the main EOR pathway. More details of DFT calculation − are provided in the Supporting Information. As a result, the calculated E ads (H) of the Pt-OCS electrodes are presented in Figure a, in which the red dashed line represents the value of pure Pt as a reference.…”