Localized Surface Plasmon Resonance Enhanced Photocatalytic Activity via MoO₂/BiOBr Nanohybrids under Visible and NIR light

Abstract

Direct efficient employing of solar energy for environmental treatment is obtaining considerable attention at present, where the efficient utilizing the visible (Vis) and near‐infrared (NIR) light is of utmost importance. Herein, the plasmonic MoO2 has been firstly employed to enhance photocatalytic activity in visible and near‐infrared light. By loading MoO2 on BiOBr nanosheets, the plasmonic MoO2/BiOBr photocatalysts have been designed and synthesized through simple hydrothermal method. Localized surface plasmon resonance (LSPR) of MoO2 makes the light absorption range of MoO2/BiOBr extend near‐infrared light. The MoO2/BiOBr nanohybrids display higher photocatalytic performance for rhodamine B (RhB) degradation than that of individual MoO2 and BiOBr under Vis‐ and NIR‐light illumination. About 98 % and 60 % of RhB is degraded in 40 min under >420 nm and >780 nm light illumination. On the one hand, LSPR of MoO2 is beneficial for light absorption and utilization. On the other hand, the synergetic effect between MoO2 and BiOBr facilitates carrier generation, transportation in the interfaces of MoO2 and BiOBr, and reduce carrier recombination. Moreover, the catalytic activity of MoO2/BiOBr nanohybrid almost shows no significant weaken even after five consecutive runs. Our study may open avenues to design the efficient noble metal‐free plasmonic photocatalysts for taking advantage of solar energy efficiently.

Plasmonic Hybrid Mo/MoO2 Nanospheres as Surface-Enhanced Raman Scattering Substrates for Molecular Detection

“…As shown in Figures a,b and S4, the Fermi level of MoO 2 enters the conduction band level, and no distinct gaps are observed between the conduction and valence bands. This is consistent with the results reported in previous literatures. , Moreover, the DOS crosses the Fermi energy, which indicates that both MoO 2 and Mo/MoO 2 present metallic behavior. The metallicity of MoO 2 mainly comes from Mo 3d orbitals with a high density of free d electrons.…”

“…This is consistent with the results reported in previous literatures. 30,38 Moreover, the DOS crosses the Fermi energy, which indicates that both MoO 5a).…”

Activation Strategy of WS2 as an Efficient Photocatalytic Hydrogen Evolution Cocatalyst through Co2+ Doping to Adjust the Highly Exposed Active (100) Facet

“…The tight contact between CZS and Co–WS 2 is significant to promote the separation and transfer of photogenerated electrons and holes. [ 33 ] The elemental mapping images of the 7% (Co–WS 2 )/CZS sample are shown in Figure 2d–i; Cd, Zn, S, W, and Co elements are homogeneous distribution over the entire area of the 7% (Co–WS 2 )/CZS sample, indicating the uniform loading of the CZS nanoparticles on the surface of Co–WS 2 and no other impurity substances existing in the composite. [ 34 ] The concentration of Co is 0.093 mg L −1 by inductively coupled plasma optical emission spectrometer (ICP–OES) measurement (Table S2, Supporting Information).…”

Tailored Plasmonic Ru/OV-MoO2 on TiO2 Catalysts via Solid-Phase Interface Engineering: Toward Highly Efficient Photoassisted Li–O2 Batteries with Enhanced Cycling Reliability

“…At the same time, MoO 2 nanomaterials have remarkable thermal and chemical stability . Notably, the high concentration of free electrons and low resistivity of MoO 2 make them have a strong LSPR effect . The doping of oxygen vacancies and loading of metal nanoparticles will promote charge transfer and improve the LSPR effect of MoO 2 . ,,− Controlled doping in semiconductors is of vital importance in developing novel materials. − Moreover, interface engineering is of crucial significance for functional devices. − Therefore, it is desirable to design a facile method to localize the defects and metal catalytic centers in MoO 2 .…”

“…23 Notably, the high concentration of free electrons and low resistivity of MoO 2 make them have a strong LSPR effect. 24 The doping of oxygen vacancies and loading of metal nanoparticles will promote charge transfer and improve the LSPR effect of MoO 2 . 15,16,24−26 Controlled doping in semiconductors is of vital importance in developing novel materials.…”