Formic acid electro-oxidation on carbon supported PdxPt1−x (0≥x≥1) nanoparticles synthesized via modified polyol method

Recent Development of Pd-Based Electrocatalysts for Proton Exchange Membrane Fuel Cells

“…The high performance of the Pd0.9Pt0.1 nanoalloy can be ascribed to the effectively inhibited CO poisoning at largely separated Pt sites and appropriately lowered d-band centre of Pd sites. The addition of Pt to Pd considerably improved the steady-state activity of Pd [74][75][76]. Chronoamperometric measurements showed that the most active catalyst was Pd0.5Pt0.5 with the particle size of 4 nm.…”

Single-step polyol synthesis of alloy Pt7Sn3 versus bi-phase Pt/SnOx nano-catalysts of controlled size for ethanol electro-oxidation

“…As we pointed out recently [26], carbon Vulcan XC-72 has reflections near 25 and 45°2h, which correspond respectively to graphite reflections 002 and 101. As these two peaks overlap with the main fcc (111) and (200) diffraction peaks, the present analysis of XRD patterns was therefore carried out at the fcc (220) peak around 68°2h (Fig.…”

“…This peak does not overlap with any diffraction peaks from carbon Vulcan XC-72. Accordingly, the (220) reflection was thus used to calculate the average crystallite size according to Debye formula for scattering by randomly oriented molecules [21] as we demonstrated in [22] for colloidal Pt and Pt x Ru 1-x , as well as in [26] for carbon-supported Pd x Pt 1-x catalysts. The average crystallite size was estimated using the full width at half maximum (FWHM) and full width at 3/4 maximum (FW3/4M) of the fcc (220) as described in [22].…”

Electrochemical preparation and characterization of PdPt nanocages with improved electrocatalytic activity toward oxygen reduction reaction

“…6 that for PdPt NCs, the Pd peaks are decreased significantly in comparison with Pd@Pt NDs, while the peak intensity of Pt reduces more slightly, suggesting remarkable Pd dissolution and little Pt loss after potential cycling [34]. Moreover, the surface composition of catalysts can be evaluated by XPS [35][36][37]. As shown in Table 1, the surface Pd/Pt molar ratio of Pd@Pt NDs/C and PdPt NCs/C was 48:52 and 32:68, respectively, both of which were smaller than that of the bulk molar ratio determined by ICP, indicating that both Pd@Pt NDs and PdPt NCs had Pt rich surfaces.…”