Porous platelike hematite mesocrystals: synthesis, catalytic and gas-sensing applications

Ma, Jianmin; Teo, Jaclyn; Mei, Lin; Zhong, Ziyi; Li, Qiuhong; Wang, Taihong; Duan, Xiaochuan; Lian, Jiabiao; Zheng, Weitao

doi:10.1039/c2jm30216k

Cited by 114 publications

(82 citation statements)

References 68 publications

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“…[6][7][8][9] However, several intrinsic properties of hematite hinder its applications in these electrochemical devices. For example, hematite has extremely short diffusion length of minority carrier (~5 nm), which leads to a significant electron-hole recombination loss in bulk hematite electrode for photoelectrochemical reactions.…”

Section: Introductionmentioning

confidence: 99%

Investigation of hematite nanorod–nanoflake morphological transformation and the application of ultrathin nanoflakes for electrochemical devices

et al. 2015

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Section: Introductionmentioning

confidence: 99%

Investigation of hematite nanorod–nanoflake morphological transformation and the application of ultrathin nanoflakes for electrochemical devices

et al. 2015

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“…This definition has been developed in recent years, where MCs are defined entirely according to their structures rather than their formation mechanism. 12 In this decade, a variety of MCs of metal oxides (for example, TiO 2 , [13][14][15][16][17][18][19][20][21][22][23] ZnO, [24][25][26][27][28][29][30][31][32][33][34] hematite (a-Fe 2 O 3 ), [35][36][37][38][39][40] maghemite (g-Fe 2 O 3 ), 41 Co 3 O 4 , 42 SnO, [43][44][45] Ag 2 O, 46 CuO [47][48][49] ), metal chalcogenides (for example, ZnS, 50,51 PbS, 52 PbSe 53,54 ), metals (for example, Au, 55 Ag, 56,57 Cu, 58 Pt, 59,60 Pd 61 ), organic compounds (for example, DL-alanine, 62,63…”

Section: Introductionmentioning

confidence: 99%

Metal oxide mesocrystals with tailored structures and properties for energy conversion and storage applications

Tachikawa

Majima

2014

NPG Asia Mater

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Mesocrystals (MCs) are superstructures with a crystallographically ordered alignment of nanoparticles. Owing to their organized structures, MCs posses some unique characteristics such as a high surface area, pore accessibility, and good electronic conductivity and thermal stability; thus, MCs could be beneficial for many areas of research and application. This review begins with a description of the common synthesis strategies for, and characterization and fundamental properties of metal oxide MCs. Newly developed analytical methods (that is, photoconductive atomic force microscopy and single-molecule, single-particle fluorescence microscopy) for unraveling the charge transport and photocatalytic properties of individual MCs are then introduced. Further, recent developments in the applications of various metal oxide MCs, especially in the fields of energy conversion and storage, are also reviewed. Finally, several perspectives in terms of future research on MCs are highlighted. NPG Asia Materials (2014) 6, e100; doi:10.1038/am.2014.21; published online 16 May 2014 Keywords: energy storage; mesocrystal; metal oxide; photocatalysis; solar energy conversion; superstructure INTRODUCTIONThe self-assembly of nanoparticle building blocks into highly ordered superstructures is one of the actively pursued research topics in materials science and technology. 1-4 Such hierarchical architectures have potentially tunable electronic, optical and magnetic properties, which promise various applications ranging from catalysis to optoelectronics. A mesocrystal (MC), which was first introduced by Cölfen in the early years of 2000s, is defined as a superstructure consisting of nanoparticles on the scale of several hundred nanometers to micrometers. [5][6][7][8][9][10][11] In contrast to the classical mechanism of atom/ ion-mediated growth of a single crystal, the particle-mediated growth mechanisms of MCs are termed as non-classical crystallization (Figure 1). This definition has been developed in recent years, where MCs are defined entirely according to their structures rather than their formation mechanism. 12 In this decade, a variety of MCs of metal oxides (for example, TiO 2 , 13-23 ZnO, [24][25][26][27][28][29][30][31][32][33][34] Among metal oxides, TiO 2 is used in many applications that deal with environmental and energy problems (for example, photodegradation of pollutants, 67 water splitting for H 2 evolution, 68 dyesensitized solar cells 68 and lithium-ion batteries 69 ) owing to its

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“…This definition has developed in the years, where mesocrystals are defined entirely according to their structures and not according to their formation mechanism 5 . So far, a variety of mesocrystals of metal oxides (for example, TiO 2 , ZnO, Fe 2 O 3 and CuO) have been synthesized [6][7][8][9][10] . The method most commonly used to synthesize mesocrystal materials is based on hydrothermal/solvothermal treatments [11][12][13][14] , in which the solution should be maintained at a specific temperature and aged for a specific period of time.…”

mentioning

confidence: 99%

A nanocomposite superstructure of metal oxides with effective charge transfer interfaces

et al. 2014

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The alignment of nanoparticle building blocks into ordered superstructures is one of the key topics in modern colloid and material chemistry. Metal oxide mesocrystals are superstructures of assembled nanoparticles of metal oxides and have potentially tunable electronic, optical and magnetic properties, which would be useful for applications ranging from catalysis to optoelectronics. Here we report a facile and general approach for synthesizing metal oxide mesocrystals and developing them into new nanocomposite materials containing two different metals. The surface and internal structures of the mesocrystals were fully characterized by electron microscopy techniques. Single-particle confocal fluorescence spectroscopy, electron paramagnetic resonance spectroscopy and time-resolved diffuse reflectance spectroscopy measurements revealed that efficient charge transfer occurred between n-type and p-type semiconductor nanoparticles in the composite mesocrystals. This behaviour is desirable for their applications ranging from catalysis, optoelectronics and sensing, to energy storage and conversion.

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Porous platelike hematite mesocrystals: synthesis, catalytic and gas-sensing applications

Cited by 114 publications

References 68 publications

Investigation of hematite nanorod–nanoflake morphological transformation and the application of ultrathin nanoflakes for electrochemical devices

Investigation of hematite nanorod–nanoflake morphological transformation and the application of ultrathin nanoflakes for electrochemical devices

Metal oxide mesocrystals with tailored structures and properties for energy conversion and storage applications

A nanocomposite superstructure of metal oxides with effective charge transfer interfaces

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