Taming interfacial electronic properties of platinum nanoparticles on vacancy-abundant boron nitride nanosheets for enhanced catalysis

Abstract

Taming interfacial electronic effects on Pt nanoparticles modulated by their concomitants has emerged as an intriguing approach to optimize Pt catalytic performance. Here, we report Pt nanoparticles assembled on vacancy-abundant hexagonal boron nitride nanosheets and their use as a model catalyst to embrace an interfacial electronic effect on Pt induced by the nanosheets with N-vacancies and B-vacancies for superior CO oxidation catalysis. Experimental results indicate that strong interaction exists between Pt and the vacancies. Bader charge analysis shows that with Pt on B-vacancies, the nanosheets serve as a Lewis acid to accept electrons from Pt, and on the contrary, when Pt sits on N-vacancies, the nanosheets act as a Lewis base for donating electrons to Pt. The overall-electronic effect demonstrates an electron-rich feature of Pt after assembling on hexagonal boron nitride nanosheets. Such an interfacial electronic effect makes Pt favour the adsorption of O2, alleviating CO poisoning and promoting the catalysis.

Size-dependent activity and selectivity of carbon dioxide photocatalytic reduction over platinum nanoparticles

“…The calibrations made on Pt 4f XPS spectra were based on the standard binding energy of C (sp 2 ) at 284.6 eV. Generally, with the increase in binding energy, three sets of peaks located at Pt 4f 7/2 and Pt 4f 5/2 can be observed, which are attributed to metallic Pt 0 and partially oxidized Pt δ + (Pt 2+ and Pt 4+ ) species, respectively 36 . After carefully fitting of the obtained spectra, the peaks information (full width at half maximum (FWHM), peak area, peak center, peak type, and area fraction) of Pt 4f was summarized in Supplementary Table 3 .…”

Subsurface catalysis-mediated selectivity of dehydrogenation reaction

“…Figure S1A shows the x-ray diffraction (XRD) patterns of the Pt/SBA-15 and PtFe@Pt/SBA-15 catalysts. For Pt/SBA-15, the 2θ peak is found at 39.7°, corresponding to the (111) plane of pure Pt crystals ( 4 ). However, the 2θ peak of PtFe@Pt/SBA-15 shifts to 39.9°, which should be from the PtFe alloy phase ( 25 ).…”

“…For example, Pt-based bimetallic catalysts show superior performance in automobile catalytic converters, in fuel cells for oxygen reduction reaction (ORR), and in the petroleum industry to catalyze a number of separated processes including, on purpose C 3 H 6 production via propane dehydrogenation (PDH) ( 2 ). In general, the addition of another component can not only reduce noble metal consumption but also often tune the catalytic properties of catalysts ( 3 , 4 ).…”

Enhanced and stabilized hydrogen production from methanol by ultrasmall Ni nanoclusters immobilized on defect-rich h-BN nanosheets

“…only help to disperse and anchor the nanoclusters, they also tremendously facilitate catalytic action and heighten overall performance by means of interacting with the metal nanoclusters (20)(21)(22)(23)(24)(25)(26)(27).…”