掺杂Cs元素的微孔晶体材料C12A7的表征及负离子发射特性

doi:10.3866/PKU.WHXB20110410

Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (04): 983-989.doi: 10.3866/PKU.WHXB20110410

• PHYSICAL CHEMISTRY OF MATERIALS • Previous Articles Next Articles

Characterization and Anion Emission Characteristics of the Microporous Crystal Cs-C12A7

NING Shen, SHEN Jing, LI Xing-Long, XU Yong, LI Quan-Xin

Laboratory of Biomass Clean Energy, Department of Chemical Physics, University of Science & Technology of China, Hefei 230026, P. R. China

Received:2010-11-26 Revised:2011-01-17 Published:2011-03-29
Contact: LI Quan-Xin E-mail:liqx@ustc.edu.cn
Supported by:
The project was supported by the National Natural Science Foundation of China (50772107), National Key Basic Research Program of China (973) (2007CB210206) and National High-Tech Research and Development Program of China (863) (2009AA05Z435).

Abstract

Abstract:

Cesium-12CaO·7Al₂O₃ (Cs-C12A7) was fabricated by adding CsI to the C12A7 surface using incipient wetness impregnation. The X-ray diffraction (XRD) structure determined for the Cs-C12A7 material is the same as that of the 12CaO·7Al₂O₃ (C12A7) crystal, which belongs to the I43d] space group. The concentrations of O^- and O₂^- in Cs-C12A7 were about (1.3±0.3)×10²⁰ cm^-3 and (1.2±0.2)×10²⁰ cm^-3, respectively, according to a simulation of the measured electron paramagnetic resonance (EPR) spectrum. This is similar to the data obtained for fresh C12A7 ([O^-]=(1.4±0.3)×10²⁰ cm^-3 and [O₂^-]=(1.4±0.3)×10²⁰ cm^-3). The CsI particles from the C12A7 surface were observed using field emission scanning electron microscope (FESEM) and conventional transmission electron microscopy (TEM). The emission features of Cs-C12A7, including the emission distribution, field effect and apparent activation energy were investigated in detail and compared with those of C12A7. The advanced emission behavior was attributed to a reduction in the apparent activation energy.

Key words: Atomic oxygen anion, Cs-C12A7, Emission characteristics, Storage characteristics, Apparent activation energy

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NING Shen, SHEN Jing, LI Xing-Long, XU Yong, LI Quan-Xin. Characterization and Anion Emission Characteristics of the Microporous Crystal Cs-C12A7[J]. Acta Phys. -Chim. Sin. 2011, 27(04), 983-989. doi: 10.3866/PKU.WHXB20110410

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Characterization and Anion Emission Characteristics of the Microporous Crystal Cs-C12A7

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