In-situ growth of mesoporous Nb2O5 microspheres on g-C3N4 nanosheets for enhanced photocatalytic H2 evolution under visible light irradiation

Huang, Qunzeng; Wang, Jichao; Wang, Panpan; Yao, Hong-Chang; Li, Zhongjun

doi:10.1016/j.ijhydene.2017.02.052

Cited by 53 publications

(19 citation statements)

References 61 publications

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“…Huang and coauthors reported an in situ growth of mesoporous Nb 2 O 5 microspheres on the surface of g-C 3 N 4 [21]. In this case, assuming the photocatalytic activity of g-C 3 N 4 under visible light, the enhanced photoactivity was mainly achieved thanks to the effective interfacial charge transfer between g-C 3 N 4 and Nb 2 O 5 .…”

Section: Niobium Pentoxide (Nb 2 O 5 )mentioning

confidence: 98%

“…Nb 2 O 5 is a typical n-type semiconductor that, along with other oxides, has been widely studied as a photocatalyst thanks to its electronic properties such as excellent chemical and thermal stability, large abundance, rich morphologies, and several polymorphs [19][20][21][22]. It is a white solid powder, insoluble in water, and can be dissolved just by fusion with strong basic or acid fluxes.…”

Section: Niobium Pentoxide (Nb 2 O 5 )mentioning

confidence: 99%

“…Despite these properties, bulk Nb 2 O 5 is not able to achieve a considerable photoactivity owing to its low specific surface area and fast recombination rate of the photogenerated charge carriers [21]. In this sense, several approaches have been applied to increase its photocatalytic performance.…”

Section: Niobium Pentoxide (Nb 2 O 5 )mentioning

confidence: 99%

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Recent Advances in Niobium-Based Materials for Photocatalytic Solar Fuel Production

et al. 2020

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The search for renewable and clean energy sources is a key aspect for sustainable development as energy consumption has continuously increased over the years concomitantly with environmental concerns caused by the use of fossil fuels. Semiconductor materials have great potential for acting as photocatalysts for solar fuel production, a potential energy source able to solve both energy and environmental concerns. Among the studied semiconductor materials, those based on niobium pentacation are still shallowly explored, although the number of publications and patents on Nb(V)-based photocatalysts has increased in the last years. A large variety of Nb(V)-based materials exhibit suitable electronic/morphological properties for light-driving reactions. Not only the extensive group of Nb2O5 polymorphs is explored, but also many types of layered niobates, mixed oxides, and Nb(V)-doped semiconductors. Therefore, the aim of this manuscript is to provide a review of the latest developments of niobium based photocatalysts for energy conversion into fuels, more specifically, CO2 reduction to hydrocarbons or H2 evolution from water. Additionally, the main strategies for improving the photocatalytic performance of niobium-based materials are discussed.

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Section: Niobium Pentoxide (Nb 2 O 5 )mentioning

confidence: 98%

Section: Niobium Pentoxide (Nb 2 O 5 )mentioning

confidence: 99%

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Recent Advances in Niobium-Based Materials for Photocatalytic Solar Fuel Production

et al. 2020

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“…Z. Hong et al [19] and Q. Z. Huang et al [20] have prepared g-C3N4/Nb2O5 heterojunctions facing, however, considerable limitations concerning the control of the size and shape of Nb2O5, and resulting in a rather small specific surface area. Moreover, to the best of our knowledge, Nb2O5/g-C3N4 heterostructures have so far not been explored for molecular H2 evolution.…”

Section: Introductionmentioning

confidence: 99%

In-Situ Synthesis of Nb2O5/g-C3N4 Heterostructures as Highly Efficient Photocatalysts for Molecular H2 Evolution under Solar Illumination

et al. 2019

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This work focuses on the synthesis of heterostructures with compatible band positions and a favourable surface area for the efficient photocatalytic production of molecular hydrogen (H2). In particular, 3-dimensional Nb2O5/g-C3N4 heterostructures with suitable band positions and high surface area have been synthesized employing a hydrothermal method. The combination of a Nb2O5 with a low charge carrier recombination rate and a g-C3N4 exhibiting high visible light absorption resulted in remarkable photocatalytic activity under simulated solar irradiation in the presence of various hole scavengers (triethanolamine (TEOA) and methanol). The following aspects of the novel material have been studied systematically: the influence of different molar ratios of Nb2O5 to g-C3N4 on the heterostructure properties, the role of the employed hole scavengers, and the impact of the co-catalyst and the charge carrier densities affecting the band alignment. The separation/transfer efficiency of the photogenerated electron-hole pairs is found to increase significantly as compared to that of pure Nb2O5 and g-C3N4, respectively, with the highest molecular H2 production of 110 mmol/g·h being obtained for 10 wt % of g-C3N4 over Nb2O5 as compared with that of g-C3N4 (33.46 mmol/g·h) and Nb2O5 (41.20 mmol/g·h). This enhanced photocatalytic activity is attributed to a sufficient interfacial interaction thus favouring the fast photogeneration of electron-hole pairs at the Nb2O5/g-C3N4 interface through a direct Z-scheme.

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“…whereas the photo-induced holes can be easily trapped by organic pollutants, to further oxidize organic pollutants [35,36]. Furthermore, the two sides of the pore wall individually provide a place for the oxidation and reduction reaction, which facilitate separation of the electrons and holes.…”

Section: Photoactivity Evaluation Of As-prepared Materialsmentioning

confidence: 99%

Facile Synthesis of Uniform Mesoporous Nb2O5 Micro-Flowers for Enhancing Photodegradation of Methyl Orange

et al. 2021

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The removal of organic pollutants using green environmental photocatalytic degradation techniques urgently need high-performance catalysts. In this work, a facile one-step hydrothermal technique has been successfully applied to synthesize a Nb2O5 photocatalyst with uniform micro-flower structure for the degradation of methyl orange (MO) under UV irradiation. These nanocatalysts are characterized by transmission and scanning electron microscopies (TEM and SEM), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) method, and UV-Vis diffuse reflectance spectroscopy (DRS). It is found that the prepared Nb2O5 micro-flowers presents a good crystal phases and consist of 3D hierarchical nanosheets with 400–500 nm in diameter. The surface area is as large as 48.6 m2 g−1. Importantly, the Nb2O5 micro-flowers exhibit superior catalytic activity up to 99.9% for the photodegradation of MO within 20 mins, which is about 60-fold and 4-fold larger than that of without catalysts (W/O) and commercial TiO2 (P25) sample, respectively. This excellent performance may be attributed to 3D porous structure with abundant catalytic active sites.

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In-situ growth of mesoporous Nb2O5 microspheres on g-C3N4 nanosheets for enhanced photocatalytic H2 evolution under visible light irradiation

Cited by 53 publications

References 61 publications

Recent Advances in Niobium-Based Materials for Photocatalytic Solar Fuel Production

Recent Advances in Niobium-Based Materials for Photocatalytic Solar Fuel Production

In-Situ Synthesis of Nb2O5/g-C3N4 Heterostructures as Highly Efficient Photocatalysts for Molecular H2 Evolution under Solar Illumination

Facile Synthesis of Uniform Mesoporous Nb2O5 Micro-Flowers for Enhancing Photodegradation of Methyl Orange

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