Radially oriented mesoporous TiO
            <sub>2</sub>
            microspheres with single-crystal–like anatase walls for high-efficiency optoelectronic devices

Liu, Yong; Che, Renchao; Chen, Gang; Fan, Jianwei; Sun, Zhenkun; Wu, Zhangxiong; Wang, Minghong; Li, Bin; Wei, Jing; Wei, Yong; Wang, Geng; Guan, Guozhen; Elzatahry, Ahmed A.; Bagabas, Abdulaziz; Al-Enizi, Abdullah M.; Deng, Yonghui; Peng, Huisheng; Zhao, Dongyuan

doi:10.1126/sciadv.1500166

Cited by 157 publications

(155 citation statements)

References 34 publications

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“…As one of the most attractive candidates for anode materials of Li-ion batteries, TiO2 has drawn increasing interest [4,[7][8][9][10][11]. It has several remarkable characteristics, including its low cost, environmental non-toxicity, a high operation voltage (suppressing the formation of solid-electrolyte interphase layers and Li dendrites), a small volume change, and a robust structure.…”

Section: Introductionmentioning

confidence: 99%

Fast synthesis of uniform mesoporous titania submicrospheres with high tap densities for high-volumetric performance Li-ion batteries

et al. 2017

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High-tap density electrode materials are greatly desired for Li-ion batteries with high volumetric capacities to fulfill the growing demands of electric vehicles and portable smart devices. TiO2, which is one of the most attractive anode materials, is limited in their application for Li-ion batteries because of its low tap density (usually <1 g cm −3 ) and volumetric capacity. Herein, we report uniform mesoporous TiO2 submicrospheres with a tap density as high as 1.62 g cm −3 as a promising anode material. Even with a high mass loading of 24 mg cm −2 , the TiO2 submicrospheres have impressive volumetric capacities that are more than double those of their counterparts. Moreover, they can be synthesized with 100% yield and within a reaction time of~6 h by optimizing the experimental conditions and formation mechanism, exhibiting potential for large-scale production for industrial applications. Other mesoporous anode materials, i.e., hightap density mesoporous Li4Ti5O12 submicrospheres, are fabricated using the generalized method. We believe that our work provides a significant reference for the industrial production of mesoporous materials for Li-ion batteries with a high volumetric performance.

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Section: Introductionmentioning

confidence: 99%

Fast synthesis of uniform mesoporous titania submicrospheres with high tap densities for high-volumetric performance Li-ion batteries

et al. 2017

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“…[1][2][3][4][5][6][7][8] Organic-inorganic assembly processes,using surfactants [9] or block co-polymers as soft templates,a re one feasible pathway for the creation of ordered mesoporous metal oxides. [10][11][12][13][14][15][16] Nanocasting from ordered mesoporous silica or carbon as hard template [17] is an alternative,i fs oft templating fails or only yields ill-crystallized materials.H owever,e specially the conditions for removal of the template from the pore system are problematic,s ince many oxides are reducible and/or thermally not stable,w hich can lead to collapse of the mesostructure.I n addition, without special steps the atomic scale structure stays amorphous or is only ill crystallized.…”

mentioning

confidence: 99%

Surface‐Casting Synthesis of Mesoporous Zirconia with a CMK‐5‐Like Structure and High Surface Area

Schmidt

Pichler

et al. 2017

Angew Chem Int Ed

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About 15 years ago,t he Ryoo group described the synthesis of CMK-5, am aterial consisting of ah exagonal arrangement of carbon nanotubes.E xtension of the surface casting synthesis to oxide compositions,h owever,w as not possible so far,i ns pite of many attempts.H ere it is demonstrated, that crystalline mesoporous hollow zirconia materials with very high surface areas up to 400 m 2 g À1 ,and in selected cases in the form of CMK-5-like,are indeed accessible via such as urface casting process.T he key for the successful synthesis is an increased interaction between the silica hard template surface and the zirconia precursor species by using silanol group-richm esoporous silica as ah ard template.T he surface areas of the obtained zirconias exceed those of conventionally hard-templated ones by af actor of two to three.The surface casting process seems to be applicable also to other oxide materials.High surface area, nanostructured, crystalline metal oxides are av ery interesting class of materials,d ue to their great potential in various applications. [1][2][3][4][5][6][7][8] Organic-inorganic assembly processes,using surfactants [9] or block co-polymers as soft templates,a re one feasible pathway for the creation of ordered mesoporous metal oxides. [10][11][12][13][14][15][16] Nanocasting from ordered mesoporous silica or carbon as hard template [17] is an alternative,i fs oft templating fails or only yields ill-crystallized materials.H owever,e specially the conditions for removal of the template from the pore system are problematic,s ince many oxides are reducible and/or thermally not stable,w hich can lead to collapse of the mesostructure.I n addition, without special steps the atomic scale structure stays amorphous or is only ill crystallized. Numerous attempts have been reported to enhance the stability of the framework of mesoporous metal oxides,a nd many of them are successful for selected compositions. [18][19][20][21][22] In addition, often the surface areas of the nanocast metal oxides are rather low,d ue to structural shrinkage and sintering of primary particles during the thermal treatment. Moreover,s ince the complete pore system of the mold is filled, and thus the surface area of the cast oxide corresponds to the previously exposed surface of the mold, the achievable surface area is limited. Thel atter point also prevents the synthesis of some interesting structures,such as hollow tubular arrays as in CMK-5 carbon, with very high surface areas (up to 2500 m 2 g À1 )a nd large pore volumes (up to 2.0 cm 3 g À1).[23-27] While extension to other compositions has been attempted again and again over the last 15 years,t his has not been successful so far. In the following,w ed escribe as urface-casting method for the synthesis of crystalline zirconias with very high surface areas,a nd in selected cases in form of nanotube arrays (surface cast oxide,S CO), which can be extended also to other oxides.T he process relies on as ilanol group-rich mesoporous silica as hard template,w ith as urface fu...

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“…[13] Firstly, 1.6 g of F127, 0.2 g of H 2 O, 2.4 g of HCl (36 wt%), 2.4 g of HOAc and certain amount of NYF@SiO 2 UCNPs were dissolved in 30 mL of tetrahydrofuran (THF) under vigorously stirring for 60 min. Then, 3.5 g of TBOT was added dropwise into the above mixture.…”

Section: Methodsmentioning

confidence: 99%

“…5.7 nm pore size and single-crystal-like anatase channel walls with dominant (101) exposed facets, beneficial for conducting charges and anchoring small molecules. [13] However, such special structural TiO 2 mesoporous microspheres can only respond to UV light due to their wide band gap. It is still significant to rationally design these single-crystal-like TiO 2 mesoporous microspheres based composites with broadband response region to solar light, which are supposed to have enhanced photocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Plasmonic Au Decorated Single‐crystal‐like TiO₂‐NaYF₄ Mesoporous Microspheres for Enhanced Broadband Photocatalysis

et al. 2017

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Single-crystal-like TiO 2 mesoporous microspheres have been reported with high photocatalytic activity under ultraviolet light (UV light) because of their high specific surface areas and single-crystal-like channel walls. In this work, plasmonic gold nanoparticles (Au NPs) and β-NaYF 4 : Yb 3＋ , Er 3＋ upconversion nanoparticles (UCNPs) were composited with single-crystal-like TiO 2 mesoporous microspheres through a series of facile approaches, aiming at broadening response region of solar light from UV to visible and near infrared light and enhancing the photocatalytic activity further. The structure was rationally designed by modifying the pore size of TiO 2 mesoporous microspheres so as to anchor plasmonic Au NPs, and covering β-NaYF 4 : Yb 3＋ , Er 3＋ with SiO 2 in order to embed UCNPs into TiO 2 mesoporous microspheres via hydrophilic interaction. This work studied the attribution of Au NPs and UCNPs to photocatalysis and found out that combining Au NPs and certain amount of UCNPs with single-crystallike TiO 2 mesoporous microspheres in a monolithic architecture would bring enhanced broadband photocatalytic activity under simulated solar light. Consequently, the composite photocatalyts containing 150 mg UCNPs showed a significant enhancement in reaction rate, which was 36.02% higher than commercial P25 and 85.09% higher than pure TiO 2 mesoporous microspheres under simulated solar light.

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Radially oriented mesoporous TiO ₂ microspheres with single-crystal–like anatase walls for high-efficiency optoelectronic devices

Abstract: Uniform mesoporous single-crystal TiO2 spheres with radial channels from driving orientation assembly can be used for energy storage.

Cited by 157 publications

References 34 publications

Fast synthesis of uniform mesoporous titania submicrospheres with high tap densities for high-volumetric performance Li-ion batteries

Fast synthesis of uniform mesoporous titania submicrospheres with high tap densities for high-volumetric performance Li-ion batteries

Surface‐Casting Synthesis of Mesoporous Zirconia with a CMK‐5‐Like Structure and High Surface Area

Plasmonic Au Decorated Single‐crystal‐like TiO₂‐NaYF₄ Mesoporous Microspheres for Enhanced Broadband Photocatalysis

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Radially oriented mesoporous TiO 2 microspheres with single-crystal–like anatase walls for high-efficiency optoelectronic devices

Abstract: Uniform mesoporous single-crystal TiO2 spheres with radial channels from driving orientation assembly can be used for energy storage.

Cited by 157 publications

References 34 publications

Fast synthesis of uniform mesoporous titania submicrospheres with high tap densities for high-volumetric performance Li-ion batteries

Fast synthesis of uniform mesoporous titania submicrospheres with high tap densities for high-volumetric performance Li-ion batteries

Surface‐Casting Synthesis of Mesoporous Zirconia with a CMK‐5‐Like Structure and High Surface Area

Plasmonic Au Decorated Single‐crystal‐like TiO2‐NaYF4 Mesoporous Microspheres for Enhanced Broadband Photocatalysis

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Product

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Radially oriented mesoporous TiO ₂ microspheres with single-crystal–like anatase walls for high-efficiency optoelectronic devices

Plasmonic Au Decorated Single‐crystal‐like TiO₂‐NaYF₄ Mesoporous Microspheres for Enhanced Broadband Photocatalysis