Oxidic structures on copper-gold alloy nanofacets

Kumar, Nandha; Lee, Yonghyuk; Lee, Giyeok; Lee, Sangseob; Lee, Taehun; Yoo, Su-Hyun; Stampfl, Catherine; Soon, Aloysius; Jang, Woosun

doi:10.1016/j.apsusc.2022.155913

Cited by 2 publications

(1 citation statement)

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“…It is well-known that the electronic structure of a supported nanocatalyst can be modulated by varying and engineering the substrate support. [42,43] The PDOS plots reveal that the d-bands of Ru in RTN are left-shifted compared to that in RTN-D. Their relative reactivity for HER could be evaluated using the d-band center, which is a widely used chemical descriptor. [31] Hcp Ru surfaces are reported to exhibit a strong affinity for H (i.e., they have excessively high H adsorption energies).…”

Section: Relative Efficiency Of Exsolution and Deposition Methods In ...mentioning

confidence: 99%

Ammonolysis‐Driven Exsolution of Ru Nanoparticle Embedded in Conductive Metal Nitride Matrix to Boost Electrocatalyst Activity

Yun,

Lee,

Jin

et al. 2024

Advanced Science

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Exsolution is an effective method for synthesizing robust nanostructured metal‐based functional materials. However, no studies have investigated the exsolution of metal nanoparticles into metal nitride substrates. In this study, a versatile nitridation‐driven exsolution method is developed for embedding catalytically active metal nanoparticles in conductive metal nitride substrates via the ammonolysis of multimetallic oxides. Using this approach, Ti1−xRuxO2 nanowires are phase‐transformed into holey TiN nanotubes embedded with exsolved Ru nanoparticles. These Ru‐exsolved holey TiN nanotubes exhibit outstanding electrocatalytic activity for the hydrogen evolution reaction with excellent durability, which is significantly higher than that of Ru‐deposited TiN nanotubes. The enhanced stability of the Ru‐exsolved TiN nanotubes can be attributed to the Ru nanoparticles embedded in the robust metal nitride matrix and the formation of interfacial Ti3+─N─Ru4+ bonds. Density functional theory calculations reveal that the exsolved Ru nanoparticles have a lower d‐band center position and optimized hydrogen affinity than deposited Ru nanoparticles, indicating the superior electrocatalyst performance of the former. In situ Raman spectroscopic analysis reveals that the electron transfer from TiN to Ru nanoparticles is enhanced during the electrocatalytic process. The proposed approach opens a new avenue for stabilizing diverse metal nanostructures in many conductive matrices like metal phosphides and chalcogenides.

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Section: Relative Efficiency Of Exsolution and Deposition Methods In ...mentioning

confidence: 99%