The synergistic effect of a well-defined Au@Pt core–shell nanostructure toward photocatalytic hydrogen generation: interface engineering to improve the Schottky barrier and hydrogen-evolved kinetics

Abstract

A well-defined co-catalyst system TiO2 nanotube-Au (core)-Pt (shell) was demonstrated to be the combination of the localized surface plasmon effect of gold and excellent proton reduction nature of platinum. Furthermore, surface engineering by the descending Fermi energies of gold and platinum was beneficial to electron transfer.

Atomic-Level Understanding of the Effect of Heteroatom Doping of the Cocatalyst on Water-Splitting Activity in AuPd or AuPt Alloy Cluster-Loaded BaLa4Ti4O15

“…These results indicate that Pd doping decreases the water-splitting activity while Pt doping has an enhancing effect. Improvement of the water-splitting activity by Pt doping has also been reported in the studies using larger Au–Pt alloy nanoparticles as the cocatalyst. − Figure shows that, for the photocatalysts loaded with small cocatalysts, a similar effect occurs in the same manner even if only one atom of the Au cocatalyst is replaced by Pt.…”

“…The electronic structure of metal clusters can change when they are doped with heteroelements. − Thus, it is possible to further improve the activity of the cocatalyst when appropriate heteroatom doping is applied to the cocatalyst. With respect to heteroatom doping of cocatalysts, previous studies have used the photocatalysts loaded with a cocatalyst with a variety of particle sizes and doping ratios (chemical compositions). − However, to obtain a detailed understanding of the effect of heteroatom doping of the cocatalyst on the photocatalytic activity and to establish clear design guidelines for achieving high activity, it is crucial to investigate photocatalysts loaded with a cocatalyst having a precisely controlled chemical composition.…”

The Synergism of Platinum-Gold Bimetallic Nanoconjugates Enhances 5-Fluorouracil Delivery In Vitro

“…Spherical AuNps dispersed in water display a strong SPR absorbance band in the visible region (520 nm), and PtNps in the near-infrared region (220 nm), which is attributed to in-plane dipole resonance [36]. The formation of Au core–Pt shell nanostructures is accompanied by a blue shift and quenching of AuNps’ SPR, as Pt shell atoms epitaxially nucleate and grow on the surface of the Au core, until there is complete disappearance of the AuNps SPR [37].…”

In Situ Creation of Surface-Enhanced Raman Scattering Active Au–AuOx Nanostructures through Electrochemical Process for Pigment Detection

“…To reveal this unexpected substance that was generated during the whole electrochemical process, its chemical information was investigated by Raman spectroscopy due to its rapid and sensitive nature in comparison with other measuring techniques (Figure ). − In the condition that reverse rate was higher than forward rate, it could be clarified that the Au halide, which was produced from the dissolved Au in a KCl electrolyte, was unable to be completely reduced. This incomplete Au halide deposition/reduction could be revealed by observing a characteristic peak at 310 cm –1 , which was assigned to the stretching vibration of Au–Cl (ν Au–Cl ) on the surface of both SPE-Au200 and SPE-Au100 samples .…”