Oxygen vacancies on TiO₂ promoted the activity and stability of supported Pd nanoparticles for the oxygen reduction reaction

Abstract

The electron transfer from TiO2-VO to Pd NPs plays a crucial role in promoting ORR performance of Pd-based electrocatalysts.

Biomass Valorization via Paired Electrosynthesis Over Vanadium Nitride‐Based Electrocatalysts

“…The doublet shown by Pd/VN was deconvoluted into two predominant peaks corresponding to the 3d 3/2 and 3d 5/2 states (Figure b). The Pd 3d 5/2 peak at 335.4 eV was ascribed to Pd 0 species, whereas the Pd 3d 5/2 peak at 337.3 eV was attributed to Pd 2+ . The V 2p band was also deconvoluted into V 2p 3/2 and V 2p 1/2 because of the spin–orbit splitting, and both peaks were separated by ≈7.5 eV (Figure c).…”

“…Pd nanoparticles with an average size of 3.5 nm were uniformly dispersed on VN. A 0.226 nm lattice fringe spacing was clearly observed and indexed to the (111) crystal plane of Pd (Figure g) . Inductively coupled plasma (ICP) spectroscopy was used to obtain the Pd mass content of Pd/VN (9.93%).…”

Enhanced Oxygen Reduction Activity on Carbon Supported Pd Nanoparticles Via SiO2

“…Further exploration of changes in the O value, The O 1s XPS spectra (Figure d) can be divided into two peaks for Pd/SiO 2 , as follows: surface oxygen and lattice oxygen of SiO 2 . Based on Figure d, the O 1s three peaks for Pd/SiO 2 @C should be assigned to surface oxygen, lattice oxygen of SiO 2 and may be conductive carbon surface oxygen or oxygen in Si‐O−C, which may be due to SiO 2 and C composite support.…”

“…showed that W 4 O 49 supported Pd nanoparticles exhibit excellent catalytic activity and well durability for ORR. In addition to W 4 O 49 , TiO 2 with oxygen vacancies, and black titania nanobelts with Ti 3+ are also used as supports with high catalytic activity for ORR. The authors suggested that it was the electron‐rich Pd surface caused by supported facilitated ORR catalytic activity, which was also demonstrated by experiments and DFT calculations ,.…”

“…In addition to W 4 O 49 , TiO 2 with oxygen vacancies, and black titania nanobelts with Ti 3+ are also used as supports with high catalytic activity for ORR. The authors suggested that it was the electron‐rich Pd surface caused by supported facilitated ORR catalytic activity, which was also demonstrated by experiments and DFT calculations ,. The above conclusions show that the electronic changes in Pd play a vital role in the ORR, and the electronegative Pd may facilitate the ORR reaction.…”