S-doped AuPd aerogels as high efficiency catalysts for the oxygen reduction reaction by balancing the ratio between bridging S₂²⁻ and apical S²⁻ ligands

Abstract

In this work, AuPd-SB67A33 aerogels with an optimal ratio of bridging S22- and apical S2- ligands (abbreviated as SB and SA, respectively) are synthesized by conformal growth of Pd onto...

A new synthesis approach of hierarchical MoS2 nanoflakes toward hydrogen evolution in both acidic and alkaline media

“…However, the peak located at 163.5 eV corresponds to S 2p of bridging S 2 2− or apical S 2− , which should be the unsaturated S atoms acting as the active sites for the HER. 30 The high-resolution Mo 3d spectrum (Fig. 2b) can be deconvoluted into six individual peaks fitted with the Gaussian profile.…”

Ethanol Oxidation via 12‐Electron Pathway on Spiky Au@AuPd Nanoparticles Assisted by Near‐Infrared Light

“…Thus, the increase in the intensities of the Pd 3d 5/2 signals in spiky Au@AuPd NPs and spiky Au@Pd NPs results from the contribution of the Au 4d 5/2 signals. [ 47 ] In addition, the larger contribution of the Au 4d 5/2 signals of spiky Au cores to Pd 3d 5/2 signals of outermost Pd layer in the spiky Au@AuPd NPs further indicates the formation of ultrathin AuPd shells on the surfaces of spiky Au NPs. Accordingly, the strong interaction between Pd and Au would also impact absorption and desorption ability of Pd located at outermost surfaces.…”

Small Trimetallic Au-PdPt Nanoparticles as Multifunctional Catalysts by Simply Engineering Their Pd–Pt Ratios

“…This is possibly because the positive shift of BEs in the Pt 4f signals of Au 55.6 -Pd 33.5 Pt 10.9 -NP/C (+0.22 eV) in the three Au-PdPt-NP/C catalysts is the smallest, which is smaller than that of Au 52.4 -Pd 7.7 Pt 39.9 -NP/C (+1.27 eV) and Au 55.4 -Pd 14.5 Pt 30.1 -NP/C (+1.25 eV). As for the ORR in alkaline media, the large downshift of the d-band center of Pt can enhance the desorption ability of oxygen-containing species so much that it cannot meet the adsorption of enough O 2 . ,, Thus, the smaller downshift of the d-band center of Pt (+0.25 eV) can achieve a balance of the adsorption and desorption of oxygen-containing species at the same time, thus enhancing the ORR performance in alkaline media.…”

“…As for the ORR in alkaline media, the large downshift of the d-band center of Pt can enhance the desorption ability of oxygen-containing species so much that it cannot meet the adsorption of enough O 2 . 32,58,59 Thus, the smaller downshift of the d-band center of Pt (+0.25 eV) can achieve a balance of the adsorption and desorption of oxygencontaining species at the same time, thus enhancing the ORR performance in alkaline media.…”

“…Thus, the introduction of Pd into our reported USCS Au@AuPt NPs may further improve the electrocatalytic performance in acidic media because the tensile strain between Pt and Au can be weakened. In contrast, the excellent electrocatalytic performance of Pd-based catalysts in alkaline media is well-known for its faster kinetics and more corrosion resistance stability. − Therefore, in addition to the improvement in the performance of the HER and ORR in acidic media, the formation of alloyed Pd–Pt layers with a proper ratio of Pd and Pt on Au NPs may enhance the electrocatalytic performance and stability of Pt-based catalysts toward the alkaline ORR. − …”