K4Ce2M10O30 (M = Ta, Nb) as visible light-driven photocatalysts for hydrogen evolution from water decomposition

Tian, Mengkui; Shangguan, Wenfeng; Yuan, Jian; Jiang, Li; Chen, Mingxia; Shi, Jianwei; Ouyang, Ziyuan; Wang, Shijie

doi:10.1016/j.apcata.2006.04.035

Cited by 61 publications

(37 citation statements)

References 36 publications

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“…2 ). From previous study, there is suggestion that the difference in the photocatalytic properties between isostructure tantalates and niobates is mainly due to the difference in their band structure rather than their difference in light absorption and surface properties [13]. It is well known that Ta5d level is higher than that of Nb4d, The higher the level of conduction band edge, the higher reduction ability it possesses, therefore, resulting in the driving force for H 2 evolution on K 4 Ce 2 Ta 10 O 30 is more powerful than that on K 4 Ce 2 Nb 10 O 30 , and so do those with loading of Pt, RuO 2 and NiO x .…”

Section: Measurement Of Photocatalytic Activitymentioning

confidence: 99%

“…Although the unoccupied Ce4f orbitals have overlap in the bottom of conduction band, they are less effective in transferring electrons and photocatalytic activities for their highly localized nature. The contribution of these orbitals to the energy bands affects the electronic structure of both the photocatalysts and gives rise to their differences in light absorption and photocatalytic activities [13]. 2 and NiO x are shown in Fig.…”

Section: Measurement Of Photocatalytic Activitymentioning

confidence: 99%

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Promotion effect of nanosized Pt, RuO₂and NiO_xloading on visible light-driven photocatalysts K₄Ce₂M₁₀O₃₀(M = Ta, Nb) for hydrogen evolution from water decomposition

Tian

Shangguan

Yuan

et al. 2007

Science and Technology of Advanced Materials

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from aqueous solutions containing a sacrificial electron donor (Na 2 SO 3 ) under visible light irradiation (l4420 nm) without any co-catalyst. When they were loading with Pt, RuO 2 and NiO x , the activities for evolving H 2 were prompted markedly. By SEM and TEM investigations, it can be seen that these loading metal and metal oxides are dispersed on the surface of photocatalysts K 4 Ce 2 M 10 O 30 (M ¼ Ta, Nb) in diameter of about 10-30 nm particles, especially the NiO x loading even formed double layered structure with metal nickel (Ni) and metal oxide (NiO). The reasons for the increasing activities after these loading may be attributable to facilitate electron migrating from the conduction band of K 4 Ce 2 M 10 O 30 (M ¼ Ta, Nb) to the Pt, RuO 2 and NiO x nanoparticles, which function as H 2 production sites on the surface of catalysts. The same phenomenon appears on the solid solution K 4 Ce 2 Ta 10Àx Nb x O 30 (x ¼ 0210) with loading RuO 2 .

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Section: Measurement Of Photocatalytic Activitymentioning

confidence: 99%

Section: Measurement Of Photocatalytic Activitymentioning

confidence: 99%

Promotion effect of nanosized Pt, RuO₂and NiO_xloading on visible light-driven photocatalysts K₄Ce₂M₁₀O₃₀(M = Ta, Nb) for hydrogen evolution from water decomposition

Tian

Shangguan

Yuan

et al. 2007

Science and Technology of Advanced Materials

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“…The reduction in electron density due to substitution of Nb for partial Ti facilitated quick transfer of the electrons and suppressed charge recombination. Tian et al [62] also prepared K 4 Ce 2 M 10 O 30 (M = Ta, Nb), which is a metal oxide with a band gap of 1.8-2.3 eV. Figure 14 shows the crystal structure of this complex oxide in which three different types of tunnels, namely, triangular, square, and pentagonal, were created [62].…”

Section: Tio 2 and Its Nanostructures For Photoelectrochemical Applicmentioning

confidence: 99%

“…Tian et al [62] also prepared K 4 Ce 2 M 10 O 30 (M = Ta, Nb), which is a metal oxide with a band gap of 1.8-2.3 eV. Figure 14 shows the crystal structure of this complex oxide in which three different types of tunnels, namely, triangular, square, and pentagonal, were created [62]. This structure was beneficial for the formation of ''nests,'' which act as active sites for impregnation with nanoparticles.…”

Section: Tio 2 and Its Nanostructures For Photoelectrochemical Applicmentioning

confidence: 99%

“…Shangguan and colleagues [14,61,62] proposed nanostructural modification on the surface and in the interlayer of catalysts to enhance the activity for photocatalytic hydrogen production. Layered metal oxides such as KTiNbO 5 , K 2 Ti 4 O 9 , and K 2 Ti 3.9 Nb 0.1 O 9 were prepared, which were then intercalated with CdS.…”

Section: Tio 2 and Its Nanostructures For Photoelectrochemical Applicmentioning

confidence: 99%

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Advances in the application of nanotechnology in enabling a ‘hydrogen economy’

2008

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Hydrogen is gaining a great deal of attention as an energy carrier as well as an alternative fuel. However, in order to fully implement the so called 'hydrogen economy' significant technical challenges need to be overcome in the fields of production and storage of hydrogen and its point of use especially in fuel cells for the automotive industry. The purpose of this review is to present and discuss recent advances in the use of nanomaterials for solar hydrogen production and on-board solid state storage of hydrogen. The role of nanotechnology in enhancing the efficiency of fuel cells and reducing their cost is also discussed.

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Hydrogen Production from Renewables

Navarro¹,

Sánchez-Sánchez²,

Álvarez-Galván³

et al. 2005

Encyclopedia of Inorganic Chemistry

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Hydrogen is considered to be critical for energy and environmental sustainability. However, as hydrogen is currently produced from fossil fuels, it emits large amounts of carbon dioxide along the reforming steps. The technical challenges to achieve a stable hydrogen economy include improving process efficiencies, lowering the cost of production, and harnessing renewable sources for hydrogen production. Lignocellulosic biomass is one of the most abundant forms of renewable resources. When this precursor is used, virtually no net greenhouse gas emissions result because a natural cycle is maintained, in which carbon is extracted from the atmosphere during plant growth and is released during hydrogen production. This article focuses on recent developments in biomass and biomass‐derived product conversion to H 2 . The second option explored here is the conversion of solar energy into hydrogen via water‐splitting processes assisted by two‐step metal‐oxide thermochemical cycles or by photosemiconductor catalysts. The conversion of solar energy into a clean fuel (H 2 ) is the most promising technology for the future because large quantities of hydrogen can potentially be generated in a clean and sustainable manner. Undoubtedly, the conversion of solar energy into H 2 is one of the greatest challenges scientists are facing in the twenty first century. A survey is presented of the advances made in the development of metal oxide redox pairs since the pioneering work by Nakamura in 1977 and in the development of photocatalysts for water splitting under visible light since the first work of Fujishima and Honda in 1972. The very high thermal reduction temperature used for the metal oxide redox pairs developed until now leads to severe sintering, melting, and vaporization of materials, decreasing the efficiency and durability in the cyclic operation. Consequently, the application of material science and engineering to the development of materials with lower reduction temperature and high water‐splitting ability is still a challenge in this scientific area and an overview of the progress is provided in this article. On the other hand, there are still major challenges in the development of photocatalysts with improved efficiencies for hydrogen production from water using solar energy. An overview is provided in this article of research strategies and approaches adopted in the search for photocatalysts for water splitting under visible light (new photocatalyst materials and the control of the synthesis of materials for customizing the crystallinity, electronic structure, and morphology of catalysts at nanometric scale).

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K4Ce2M10O30 (M = Ta, Nb) as visible light-driven photocatalysts for hydrogen evolution from water decomposition

Cited by 61 publications

References 36 publications

Promotion effect of nanosized Pt, RuO₂and NiO_xloading on visible light-driven photocatalysts K₄Ce₂M₁₀O₃₀(M = Ta, Nb) for hydrogen evolution from water decomposition

Promotion effect of nanosized Pt, RuO₂and NiO_xloading on visible light-driven photocatalysts K₄Ce₂M₁₀O₃₀(M = Ta, Nb) for hydrogen evolution from water decomposition

Advances in the application of nanotechnology in enabling a ‘hydrogen economy’

Hydrogen Production from Renewables

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K4Ce2M10O30 (M = Ta, Nb) as visible light-driven photocatalysts for hydrogen evolution from water decomposition

Cited by 61 publications

References 36 publications

Promotion effect of nanosized Pt, RuO2and NiOxloading on visible light-driven photocatalysts K4Ce2M10O30(M = Ta, Nb) for hydrogen evolution from water decomposition

Promotion effect of nanosized Pt, RuO2and NiOxloading on visible light-driven photocatalysts K4Ce2M10O30(M = Ta, Nb) for hydrogen evolution from water decomposition

Advances in the application of nanotechnology in enabling a ‘hydrogen economy’

Hydrogen Production from Renewables

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Product

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Promotion effect of nanosized Pt, RuO₂and NiO_xloading on visible light-driven photocatalysts K₄Ce₂M₁₀O₃₀(M = Ta, Nb) for hydrogen evolution from water decomposition

Promotion effect of nanosized Pt, RuO₂and NiO_xloading on visible light-driven photocatalysts K₄Ce₂M₁₀O₃₀(M = Ta, Nb) for hydrogen evolution from water decomposition