Solid-Solution Alloying of Immiscible Pt and Au Boosts Catalytic Performance for H2O2 Direct Synthesis

Title
Solid-Solution Alloying of Immiscible Pt and Au Boosts Catalytic Performance for H2O2 Direct Synthesis
Authors
이승용한상수김동훈여병철김민철이홍우남효빈한근호조영훈이관영
Keywords
Bimetallic catalyst; Nanoparticle; Immiscible elements; Solid-solution alloy; H2O2 direct synthesis
Issue Date
2021-02
Publisher
Acta materialia
Citation
VOL 205, 116563
Abstract
Here, we propose the solid-solution alloy nanoparticles (NPs) composed of Pt and Au supported on TiO2 as an efficient catalyst for direct H2O2 synthesis, although Pt and Au are entirely immiscible in the bulk phases. Pt and Au atoms were homogeneously distributed in a wide composition range of PtxAu100-x NPs (10 ≤ x ≤ 80) supported on TiO2. The most Au-rich Pt10Au90 NPs/TiO2 exhibits the best catalytic performances, H2O2 selectivity (94.5 ± 0.6%) and productivity (959 ± 12 mmolH2O2?gmetal?1?h?1), even under mild conditions (10 °C, 1 atm) and without halide-ion additives. Density functional theory calculations reveal that the introduction of inactive Au atoms strongly suppresses both O-O bond scission and OH hydrogenation, thereby enabling near unity selectivity. The Pt-Au catalyst is Pd-absent, which is noteworthy given previous efforts in direct H2O2 synthesis are mostly limited to prototypical Pd or Pd-based modifications. This work will stimulate active utilization of immiscible elemental combinations for the direct H2O2 synthesis catalyst development.
URI
http://pubs.kist.re.kr/handle/201004/72643
ISSN
1359-6454
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KIST Publication > Article
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