Preparation of a Stable Cr2O3/Cu/TiO2 Plasmonic Photocatalyst for Selective Alcohol Oxidation under Visible Light Irradiation (λ>600 nm)

ChemistryEurope Pub Date : 2024-03-26 DOI:10.1002/ceur.202400008

Dr. Atsuhiro Tanaka, Kohki Okabayashi, Ryosuke Yagi, Prof. Dr. Hiroshi Kominami

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Abstract

Copper (Cu) nanoparticles (NPs) loaded on titanium(IV) oxide (TiO₂) exhibit an extinction at about λ=580 nm because of surface plasmon resonance (SPR); however, they rapidly lose their its SPR when exposed to air. In order to stabilize the Cu NPs, a multi-step photodeposition method was used to introduce chromium, which resulted in successful synthesis of a Cr₂O₃/Cu/TiO₂ sample that exhibited extinction even when exposed to air. Transmission electron microscopy, scanning transmission electron microscopy, X-ray photoelectron spectroscopy and UV-vis spectroscopy were utilized to analyze the Cu/TiO₂ and Cr₂O₃/Cu/TiO₂ samples with a focus on SPR of the nanoparticles and state of the Cu species. The prepared Cr₂O₃/Cu/TiO₂ samples acted as plasmonic photocatalysts in oxidation of 2-propanol under aerated conditions and visible light irradiation. Expandability of the Cr₂O₃/Cu/TiO₂ plasmonic photocatalyst was also investigated, and the results suggested the potential of a Cu-based plasmonic photocatalyst working under irradiation of visible light.

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制备稳定的 Cr2O3/Cu/TiO2 等离子体光催化剂，用于在可见光照射下（λ>600 纳米）选择性氧化酒精

负载在氧化钛（TiO2）上的铜（Cu）纳米粒子（NPs）因表面等离子体共振（SPR）而在约 λ=580 纳米处显示出消光；然而，当它们暴露在空气中时，会迅速失去其 SPR。为了稳定 Cu NPs，采用了多步光沉积法引入铬，从而成功合成了 Cr2O3/Cu/TiO2 样品，该样品即使暴露在空气中也具有消光性能。利用透射电子显微镜、扫描透射电子显微镜、X 射线光电子能谱和紫外-可见光谱分析了 Cu/TiO2 和 Cr2O3/Cu/TiO2 样品，重点是纳米颗粒的 SPR 和 Cu 物种的状态。制备的 Cr2O3/Cu/TiO2 样品在通气条件和可见光照射下作为质子光催化剂氧化 2-丙醇。此外，还研究了 Cr2O3/Cu/TiO2 等离子光催化剂的可扩展性，结果表明铜基等离子光催化剂具有在可见光照射下工作的潜力。

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