Correlated Atomic Resolution Microscopy and Spectroscopy Studies of Sn(Sb)O2 Nanophase Catalysts

Sun, Kai; Liu, J.; Browning, Nigel D.

doi:10.1006/jcat.2001.3456

Cited by 41 publications

(28 citation statements)

References 40 publications

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“…Despite the character, this study can clearly indicate enrichment of Sb on the surface of powders. Studies on Sn(Sb)O 2 by STEM and EELS revealed that Sb segregation occurs as trivalent Sb 3+ at the surface of grain but Sb 5+ in the core of nanoparticles [18] .…”

Section: Discussionmentioning

confidence: 99%

XPS investigation of segregation of Sb in SnO2 powders

Wang

Peng

Guo

et al. 2008

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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Antimony doped tin-oxide powders were prepared by controlled precipitation. Surface compositions were determined by X-ray photoelectron spectroscopy (XPS). The results indicate that enrichment of dopant at the surface of nanoparticles depends on total doping concentration and annealing temperature. Doped antimony shows the tendency to diffuse to surface when annealing at high temperatures. But same amount of Sb atoms are retained on the surface for powders annealing at different temperatures. The higher enrichment at higher temperature is caused by the decreasing of surface areas. Variation of the conductivities of SnO 2 powders is also discussed.

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Section: Discussionmentioning

confidence: 99%

XPS investigation of segregation of Sb in SnO2 powders

Wang

Peng

Guo

et al. 2008

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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“…Spectroscopy techniques such as X‐ray energy‐dispersive spectroscopy (XEDS) and electron energy‐loss spectroscopy (EELS) available in the modern field‐emission gun (FEG) TEM/STEM instruments can provide unambiguous identification of the composition of the encapsulation layers. The atomic resolution EELS technique has been used to analyze practical supported metal catalysts, providing valuable information on the composition, electronic state and even charge transfer between metal nanoparticles and the support materials 170–173. Figure 8 shows a HAADF STEM image of a 5 wt %Pd/TiO 2 catalyst that had been reduced in hydrogen at 923 K for 2 h, clearly showing a Pd nanoparticle attached to the TiO 2 support.…”

Section: Metal–support Interactions: Encapsulation By the Support mentioning

confidence: 99%

Advanced Electron Microscopy of Metal–Support Interactions in Supported Metal Catalysts

2011

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Electron microscopy and its associated techniques have contributed significantly to the characterization of heterogeneous catalysts, especially supported metal catalysts, and can provide nano‐ or atomic‐scale information on the structure, morphology, composition, and electronic state of the area of interest. With the recent advancement in aberration corrections to achieve an image resolution below 0.1 nm and the rapid development of in situ techniques, advanced electron microscopy is poised to probe fundamental questions of heterogeneous catalysis and catalysts. Understanding the nature of metal–support interactions becomes critical if we want to achieve the goal of designing and fabricating nanoarchitectured catalysts with desired performances. To reliably probe the fundamental mechanisms of charge transfer, which is the core of catalysis, between individual nanoscale components and under a realistic gas environment and temperature is still a formidable challenge. This Review discusses the recent contribution of advanced electron microscopy to the study of metal–support interactions, as well as the challenges and opportunities of applying aberration‐corrected electron microscopy techniques to the investigation of atomic‐scale structures of complex heterogeneous catalysts.

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“…The synthesis and preparations of ATO are of great technological and scientific interest owing to the use of these materials as transparent electrodes, heat mirrors, displays, electrochromic windows, catalysts, rechargeable Li batteries, and energy storage devices and has potential uses in photovoltaic and optoelectronic devices [24][25][26][27][28][29][30][31][32]16,[33][34][35][36]. This communication describes a new method to prepare ATO microspheres formed by nanoparticles.…”

Section: Introductionmentioning

confidence: 99%