Controllable synthesis of Cu2O decorated WO3 nanosheets with dominant (0 0 1) facets for photocatalytic CO2 reduction under visible-light irradiation

Shi, Weina; Guo, Xiaowei; Cui, Cheng‐Xing; Jiang, Kai; Li, Zhongjun; Qu, Lingbo; Wang, Jichao

doi:10.1016/j.apcatb.2018.09.076

Cited by 154 publications

(67 citation statements)

References 38 publications

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“…Two evident peaks observed for m−WO3 at the binding energies of 37.9 and 35.8 eV were assigned to W 4f5/2 and W 4f7/2, respectively, which were in accordance with the reported results of monoclinic WO3 [31]. The peaks at 38.0 and 36.0 eV corresponded to the characteristic peaks of W(VI) in hexagonal phase WO3 [32,33]. In h/m−WO3 and 1.25Fe−h/m−WO3 samples, the characteristic peaks of W(VI) for monoclinic and hexagonal phase were discovered in the m−WO3 and h−WO3, respectively [32,34].…”

Section: Morphology and Composition Of Materialssupporting

confidence: 89%

Enhanced Photo-Assisted Acetone Gas Sensor and Efficient Photocatalytic Degradation Using Fe-Doped Hexagonal and Monoclinic WO3 Phase−Junction

et al. 2020

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The development of WO3-based gas sensors for analysis of acetone in exhaled breath is significant for noninvasive diagnosis of diabetes. A series of Fe-doped hexagonal and monoclinic WO3 phase−junction (Fe−h/m−WO3) sensors were synthesized by the hydrothermal calcination method, and the influences of operating temperature and light irradiation on the response were studied. Under light emitting diode (LED) illumination, Fe−h/m−WO3 exhibited higher responses to acetone than those of the undoped WO3-based sensors at an operating temperature of 260 °C with 90% relative humidity, and good linearity between response and acetone concentration (0.5 to 2.5 ppm) was achieved under the 90% relative humidity condition. Meanwhile, the optimal Fe−h/m−WO3 sensor exhibited high selectivity and stability for a duration of three months. The excellent sensing performance of Fe−h/m−WO3 was attributed to the formation of phase−junction and Fe doping, and these were beneficial for the separation of photon−generated carriers and oxygen adsorption on the WO3 surface, promoting the generation of superoxide radicals, which was demonstrated by electron paramagnetic resonance and photocurrent tests. Additionally, the Fe−doped WO3 phase−junction sample also showed good photocatalytic performance for rhodamine B degradation. This study may provide some insights into rational design of new types of gas sensors and offer an alternative for noninvasive diagnosis of diabetes.

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Section: Morphology and Composition Of Materialssupporting

confidence: 89%

Enhanced Photo-Assisted Acetone Gas Sensor and Efficient Photocatalytic Degradation Using Fe-Doped Hexagonal and Monoclinic WO3 Phase−Junction

et al. 2020

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“…Furthermore, the CB positions of the two samples were higher than that of the CO 2 /CH 3 OH redox potential but lower than that of the CO 2 /CO redox potential, indicating that under suitable light irradiation, these two samples can reduce CO 2 into CH 3 OH, but not into CO, at least in theory. However, under some special circumstances, such as the presence of reduced W 5+ and other defects in the particle surface, CO 2 can be reduced to CO below the potential of −0.53 V as the activation energy of CO 2 reduction to CO decreases in the presence of specific ions and defects [23,24,26,31]. In this study, the samples' photocatalytic activities were evaluated through CO 2 reduction under the full spectrum of 300 W Xe lamp.…”

Section: Crystalsmentioning

confidence: 99%

“…To improve the photocatalytic performance of materials, scientists have started to use heterojunction [20][21][22][23]. Shi et al [24] reported that the photocatalytic CO 2 reduction ability of WO 3 nanosheets was significantly increased after coupling with Cu 2 O to form a Zscheme heterojuction, due to the promoted charge separation and increased redox ability. Furthermore, researchers have found that the introduction of oxygen vacancies and reduced W 5+ in WO 3 can also significantly improve its photocatalytic CO 2 reduction activity.…”

Section: Introductionmentioning

confidence: 99%

Tungsten bronze Cs0.33WO3 nanorods modified by molybdenum for improved photocatalytic CO2 reduction directly from air

Zhao

Huang

et al. 2020

Sci. China Mater.

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Photocatalytic CO 2 reduction is thought to be a promising strategy in mitigating the energy crisis and several other environmental problems. Hence, modifying or developing suitable semiconductors with high efficiency of photocatalytic CO 2 reduction property has become a topic of interest to scientists. In this study, a series of Mo-modified Cs 0.33 WO 3 tungsten bronze were prepared using a "watercontrollable releasing" solvothermal method to produce effective photocatalytic CO 2 reduction performance. Interestingly, Mo atoms replaced W partially within the hexagonal crystal structure, leading to a significant increase in photocatalytic CO 2 reduction activity of Cs 0.33 WO 3 . The 5% Modoped compound displayed the best performance, with the production yield rates of 7.3 OH). More importantly, the as-prepared Mo-doped Cs 0.33 WO 3 series could also induce the photocatalytic reduction of CO 2 directly from the air in the presence of oxygen, which is beneficial for practical applications. The superior photocatalytic performance of Mo-doped Cs 0.33 WO 3 series over the popular reduced WO 3 may be due to the increase in light absorption induced by the localized surface plasmon resonance (LSPR) effect of Mo 5+ , large improved charge separation ability, and the co-effect of Mo and Cs in crystal. This study provides a simple strategy for designing highly efficient photocatalysts in low concentration of CO 2 reduction.

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“…This suggests that the surface of Cu 2 O is partially oxidized to CuO, which can also be veried by the shake-up satellite in the range of 940-945 eV in the Cu 2p spectra of the used catalysts. 52,53 To study the effect of CuO, the Cu 2 O-1 : 2.5 catalyst was calcined in an air atmosphere at 600 C for 2 h to obtain CuO, which, however, exhibited a poor ozone conversion efficiency of less than 10% during the 8 h test. Therefore, the active sites of ozone catalytic degradation might be the surface Cu(I) sites or some other crystal defects such as Cu vacancies, which made Cu 2 O p-type.…”

Section: Tpr and Tpd Analysesmentioning

confidence: 99%

Gram-scale synthesis of ultra-fine Cu₂O for highly efficient ozone decomposition

et al. 2020

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Controllable synthesis of Cu2O decorated WO3 nanosheets with dominant (0 0 1) facets for photocatalytic CO2 reduction under visible-light irradiation

Cited by 154 publications

References 38 publications

Enhanced Photo-Assisted Acetone Gas Sensor and Efficient Photocatalytic Degradation Using Fe-Doped Hexagonal and Monoclinic WO3 Phase−Junction

Enhanced Photo-Assisted Acetone Gas Sensor and Efficient Photocatalytic Degradation Using Fe-Doped Hexagonal and Monoclinic WO3 Phase−Junction

Tungsten bronze Cs0.33WO3 nanorods modified by molybdenum for improved photocatalytic CO2 reduction directly from air

Gram-scale synthesis of ultra-fine Cu₂O for highly efficient ozone decomposition

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Controllable synthesis of Cu2O decorated WO3 nanosheets with dominant (0 0 1) facets for photocatalytic CO2 reduction under visible-light irradiation

Cited by 154 publications

References 38 publications

Enhanced Photo-Assisted Acetone Gas Sensor and Efficient Photocatalytic Degradation Using Fe-Doped Hexagonal and Monoclinic WO3 Phase−Junction

Enhanced Photo-Assisted Acetone Gas Sensor and Efficient Photocatalytic Degradation Using Fe-Doped Hexagonal and Monoclinic WO3 Phase−Junction

Tungsten bronze Cs0.33WO3 nanorods modified by molybdenum for improved photocatalytic CO2 reduction directly from air

Gram-scale synthesis of ultra-fine Cu2O for highly efficient ozone decomposition

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Gram-scale synthesis of ultra-fine Cu₂O for highly efficient ozone decomposition