Vertically-aligned silicon carbide nanowires as visible-light-driven photocatalysts

Hong, Jian‐Hao; Meysami, Seyyed Shayan; Babenko, Vitaliy; Huang, Chun; Luanwuthi, Santamon; Acapulco, Jesus A. I.; Holdway, P.; Grant, Patrick S.; Grobert, Nicole

doi:10.1016/j.apcatb.2017.06.056

Cited by 26 publications

(9 citation statements)

References 55 publications

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“…The UK team of Hong and Grober argued on the superior electronic and mass transfer properties of uniformly aligned one-dimensional nanomaterials in energy 761,762 and environmental applications while preparing vertically aligned silicon carbide (VASiC) nanowire arrays to be employed as photocatalysts for the highly efficient Rhodamine B decomposition. 763 As shown in Figure 76, VASiC NWs were prepared from SiO 2 infiltrated vertically aligned multiwall carbon nanotubes (VACNTs) and Si powder by template synthesis at 1350 °C under inert atmosphere, followed by calcination at 900 °C in air. VASiC NWs possessed cubic crystal structure and showed strong light absorbance in the UV−vis range.…”

Section: Sic and Its Composites As Metal-free Catalystsmentioning

confidence: 99%

“…Besides presenting good stability and recyclability in photocatalysis, they also showed remarkable photocatalytic degradation activity of Rh-B under UV−vis or visible-light irradiation without the addition of any co-catalyst. 763 3C-SiC hierarchical nanowires with finned microstructure 764 and SiC hollow spheres 765 have been independently prepared by two Chinese teams and reported as photocatalysts with enhanced activity in the photodegradation of methylene blue (MB) as a pollutant in aqueous solutions under visible-light irradiation. In both cases, the presence of a surface SiO 2 layer was supposed to enhance the material catalytic performance by improving the light absorption and conversion efficiency, reducing electron−hole recombination and improving the nanowires hydrophilic character.…”

Section: Sic and Its Composites As Metal-free Catalystsmentioning

confidence: 99%

“…Graphene-coated SiC nanoparticles exhibited up to a 100% increase in the photodegradation of Rhodamine B (Rh-B) under UV illumination with respect to the pristine SiC powder. The UK team of Hong and Grober argued on the superior electronic and mass transfer properties of uniformly aligned one-dimensional nanomaterials in energy , and environmental applications while preparing vertically aligned silicon carbide (VASiC) nanowire arrays to be employed as photocatalysts for the highly efficient Rhodamine B decomposition . As shown in Figure , VASiC NWs were prepared from SiO 2 infiltrated vertically aligned multiwall carbon nanotubes (VACNTs) and Si powder by template synthesis at 1350 °C under inert atmosphere, followed by calcination at 900 °C in air.…”

Section: Sic and Its Composites As Metal-free Catalystsmentioning

confidence: 99%

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Porous Silicon Carbide (SiC): A Chance for Improving Catalysts or Just Another Active-Phase Carrier?

et al. 2021

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There is an obvious gap between efforts dedicated to the control of chemicophysical and morphological properties of catalyst active phases and the attention paid to the search of new materials to be employed as functional carriers in the upgrading of heterogeneous catalysts. Economic constraints and common habits in preparing heterogeneous catalysts have narrowed the selection of active-phase carriers to a handful of materials: oxide-based ceramics (e.g. Al2O3, SiO2, TiO2, and aluminosilicates–zeolites) and carbon. However, these carriers occasionally face chemicophysical constraints that limit their application in catalysis. For instance, oxides are easily corroded by acids or bases, and carbon is not resistant to oxidation. Therefore, these carriers cannot be recycled. Moreover, the poor thermal conductivity of metal oxide carriers often translates into permanent alterations of the catalyst active sites (i.e. metal active-phase sintering) that compromise the catalyst performance and its lifetime on run. Therefore, the development of new carriers for the design and synthesis of advanced functional catalytic materials and processes is an urgent priority for the heterogeneous catalysis of the future. Silicon carbide (SiC) is a non-oxide semiconductor with unique chemicophysical properties that make it highly attractive in several branches of catalysis. Accordingly, the past decade has witnessed a large increase of reports dedicated to the design of SiC-based catalysts, also in light of a steadily growing portfolio of porous SiC materials covering a wide range of well-controlled pore structure and surface properties. This review article provides a comprehensive overview on the synthesis and use of macro/mesoporous SiC materials in catalysis, stressing their unique features for the design of efficient, cost-effective, and easy to scale-up heterogeneous catalysts, outlining their success where other and more classical oxide-based supports failed. All applications of SiC in catalysis will be reviewed from the perspective of a given chemical reaction, highlighting all improvements rising from the use of SiC in terms of activity, selectivity, and process sustainability. We feel that the experienced viewpoint of SiC-based catalyst producers and end users (these authors) and their critical presentation of a comprehensive overview on the applications of SiC in catalysis will help the readership to create its own opinion on the central role of SiC for the future of heterogeneous catalysis.

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Section: Sic and Its Composites As Metal-free Catalystsmentioning

confidence: 99%

Section: Sic and Its Composites As Metal-free Catalystsmentioning

confidence: 99%

Section: Sic and Its Composites As Metal-free Catalystsmentioning

confidence: 99%

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Porous Silicon Carbide (SiC): A Chance for Improving Catalysts or Just Another Active-Phase Carrier?

et al. 2021

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“…These findings, together with the mentioned size-dependent photocatalytic activity, prove that the photocatalytic efficiency of SiC is extremely size-dependent. Despite the suitable band gap position for water splitting, even for cubic type of SiC with a band gap as small as 2.3 eV, SiC as a photocatalyst is far from being understood. − …”

Section: Introductionmentioning

confidence: 99%

Surface-Mediated Energy Transfer and Subsequent Photocatalytic Behavior in Silicon Carbide Colloid Solutions

2017

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“…Owing to the special status as one-dimensional semiconductors, Si NWs have exhibited seductive application potentials in many fields, such as field effect transistors, solar cells, lithium-ion batteries, and photocatalysts [9][10][11][12][13][14][15][16][17][18][19][20]. In particular, due to the superior photocatalytic activity, Si NWs present a promising potency for future visible-light photocatalysts [19,[21][22][23][24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Photodegradation Activity of Hydrogen-Terminated Si Nanowires Arrays with Different-Oriented Crystal Phases

et al. 2017

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Although Si nanowires (NWs) arrays are superior candidates for visible light photocatalysis, reports about the photodegradation activity of various crystal-orientated Si NWs are still insufficient. Here, light-doped hydrogen-terminated Si NWs arrays with different crystal orientations were prepared via a metal-assisted chemical etching method (MACE), which simply modulated the concentration of the oxidizer, H 2 O 2 . Their dye photodegradation activities were systematically and comprehensively investigated. When compared with Si NWs arrays with crystal orientations of (110) and (111), Si NWs arrays with (100) crystal orientation exhibit a superior photodegradation activity and stability due to the anisotropy of optical and physical properties. The n-type Si NWs arrays exhibit better photodegradation activity than the p-type Si NWs arrays of the same crystal orientation and similar length. The results provide a further understanding of the synthesis of Si NWs arrays with various orientations, and the relationships between photodegradation activity/stability and crystal orientations.

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Vertically-aligned silicon carbide nanowires as visible-light-driven photocatalysts

Cited by 26 publications

References 55 publications

Porous Silicon Carbide (SiC): A Chance for Improving Catalysts or Just Another Active-Phase Carrier?

Porous Silicon Carbide (SiC): A Chance for Improving Catalysts or Just Another Active-Phase Carrier?

Surface-Mediated Energy Transfer and Subsequent Photocatalytic Behavior in Silicon Carbide Colloid Solutions

Enhanced Photodegradation Activity of Hydrogen-Terminated Si Nanowires Arrays with Different-Oriented Crystal Phases

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