Morphosynthesis of Rhombododecahedral Silver Cages by Self‐Assembly Coupled with Precursor Crystal Templating

Yang, Jinhu; Qi, Limin; Lu, Conghua; Ma, Jianzhong; Cheng, Humin

doi:10.1002/ange.200461859

Cited by 11 publications

(9 citation statements)

References 34 publications

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“…3.17) indicate a full phase match to that of body-centred cubic crystalline Ag 3 PO 4 (6.004 Å, BCC, P-43n, JCPDS no.06-0505), and show no other trace peaks associated with the precursors used in fabrication, indicating that the synthesis methods lead to a [20]. The intensity ratio between (110) and (200) for rhombic dodecahedrons is 1.23, and 0.57 for the cubic crystals, confirming as previously reported that rhombic dodecahedrons and cubic structures are composed of {110} and {100} facets respectively [21]. It is noted that the (111) Bragg peak is not directly seen due to the reflection conditions of the space group, similarly, (100) cannot be seen either.…”

Section: Facet Control Of Ag 3 Po 4 (Methods 'D') [2]supporting

confidence: 89%

Oxygen Evolving Photocatalyst Development

Martin

2015

Springer Theses

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This chapter details the development and understanding of the extremely efficient photocatalyst, Ag 3 PO 4 . Due to the lack of literature which followed on from the initial investigation (by Yi et al.) exploring the photooxidation of water, it was envisaged that the preparation method was difficult to replicate [1]. This was indeed the case, as results show there was considerable differences in oxygen evolution from water between samples synthesised using different phosphate precursor sources (PO 4 − ), and different solvents. A method was established to fabricate a silver phosphate sample which had a similar roughly spherical morphology, and exhibited a photooxidative ability analogous to that published, using ethanol, AgNO 3 , and Na 2 HPO 4 . Most notably, when the phosphate precursor was changed to H 3 PO 4 , and using a large volume of ethanol was used, it was possible to slow the growth of Ag 3 PO 4 crystals, and retain low index facets, resulting in the production of novel {111} terminated tetrahedral Ag 3 PO 4 crystals. By changing the concentration of H 3 PO 4 , and thus changing the reaction kinetics, it is possible to monitor the growth mechanism of Ag 3 PO 4 crystals from tetrapods to tetrahedrons.Ag 3 PO 4 tetrahedrons demonstrate considerably higher oxygen evolution activity in comparison to roughly spherical particles, and other low index facets. DFT calculations were used to model the surface energy, and the hole mass of Ag 3 PO 4 in different directions. It is concluded that a combination of high surface energy and low hole mass on Ag 3 PO 4 {111} surfaces result in extremely high oxygen evolution from water, with an internal quantum yield of 98 % [2]. IntroductionWater photolysis for H 2 fuel synthesis has the potential to solve both increasing demand of renewable energy and climate change caused by CO 2 emissions. However the search for a solitary low cost semiconductor which has a band gap suitable for an efficient, neutral water splitting reaction under ambient conditions has been met with little success. Nature, however, demonstrates an

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Section: Facet Control Of Ag 3 Po 4 (Methods 'D') [2]supporting

confidence: 89%

Oxygen Evolving Photocatalyst Development

Martin

2015

Springer Theses

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“…To date, most reported hierarchical hollow structures are hollow spheres that are assembled from various nanobuilding units, such as nanowires, [4] nanorods, [5] nanobelts, [6] nanoribbons, [7] nanosheets, [8][9][10][11][12] nanocubes, [13,14] octahedron-like nanocrystals, [15] and hollow nanospheres. [16] In addition, hierarchical hollow cages, including rhombododecahedral silver cages, [17] cubic MoS 2 cages, [18] and octahedral and cubic Cu 2Àx Se cages, [19] have been obtained through different strategies. However, the synthesis of hierarchical hollow micro-and nanotubes has rarely been reported until now.…”

Section: Introductionmentioning

confidence: 99%

Complex–Surfactant‐Assisted Hydrothermal Synthesis and Properties of Hierarchical Worm‐Like Cobalt Sulfide Microtubes Assembled by Hexagonal Nanoplates

Liu

Wei

Xing

et al. 2010

Chemistry A European J

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The preparation of exquisite hierarchical worm-like Co(1-x)S (x = 0.75) microtubes by a one-pot complex-surfactant-assisted hydrothermal method is successfully achieved for the first time. The hierarchical structures of the microtube wall are assembled from numerous interleaving hexagonal nanoplates. X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, and high-resolution transmission electron microscopy were used to characterize the samples. The experimental results indicate that the "soft template" surfactant cetyltrimethylammonium bromide and the chelating ethylenediamine both play important roles for the formation of hierarchical Co(1-x)S microtubes. A possible formation mechanism for the growth processes is proposed. Additionally, the electrochemical and magnetic properties of Co(1-x)S microtubes were systematically studied.

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“…Inorganic hollow structures, which can be achieved by nozzle-reactor systems, sacrificial cores, or emulsion/water extraction techniques, have attracted great attention because of their wide variety of potential applications as catalysts and catalysts supports, adsorbents, sensors, drug-delivery carriers, artificial cells, photonic crystals, acoustic insulators, lightweight fillers, and microreactors (Bruinsma et al 1997;Kim et al 2002;Sun et al 2003;Lu et al 2005;Yang et al 2005;Titirici et al 2006). In particular, many efforts have been devoted to the controlled fabrication of hollow TiO 2 particles due to its vital application in photocatalysis.…”

Section: The Nonmetal Doping Methodsmentioning

confidence: 99%

Visible-Light-Responsive Titanium Dioxide Photocatalysts

Zhou¹,

Zhao

2010

Nanostructure Science and Technology

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Semiconductor photocatalysis has received increasing interest in water splitting and degradation of organic pollutants in water and air since the discovery of the photosensitization of TiO 2 electrode (Fujishima and Honda 1972). Among all photocatalysts, TiO 2 is the most studied one because of its chemical stability, nontoxicity, and high photocatalytic reactivity. However, TiO 2 mainly absorbs ultraviolet light, giving rise to a very low energy efficiency in utilizing solar light. Therefore, new photocatalysts that can be activated under visible light irradiation have been recently extensively exploited.Methods for preparing visible-light-responsive TiO 2 -based semiconductor photocatalysts include dye sensitization, doping of transition metals and nonmetal species, and surface modification. The absorption of TiO 2 sensitized by a proper dye molecule can be extended to visible region because the dye can absorb the visible light to reach an excited state (O'Regan and Gr€ atzel 1991). The dye in the excited state has, in general, a lower redox potential than the corresponding ground state. If the redox potential is lower than the conduction band (CB) of TiO 2 , an electron may be injected from the excited state into the CB, and consequently the cationic radicals and CB electron are formed (Fig. 1). While the dye-sensitized TiO 2 is efficient in the utilization of visible light, all of the known sensitizers are toxic and unstable in aqueous solution, thus making them unsuitable for applications in photocatalysis (Zhao et al. 2005).To design and develop TiO 2 -based photocatalysts that can operate under visible-light irradiation, modification of the electronic structure of the photocatalyst is indispensable. Two approaches are considered to control the electronic structure

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Morphosynthesis of Rhombododecahedral Silver Cages by Self‐Assembly Coupled with Precursor Crystal Templating

Cited by 11 publications

References 34 publications

Oxygen Evolving Photocatalyst Development

Oxygen Evolving Photocatalyst Development

Complex–Surfactant‐Assisted Hydrothermal Synthesis and Properties of Hierarchical Worm‐Like Cobalt Sulfide Microtubes Assembled by Hexagonal Nanoplates

Visible-Light-Responsive Titanium Dioxide Photocatalysts

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