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Your search keyword '"Miao, Xiaopei"' showing total 24 results
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24 results on '"Miao, Xiaopei"'

20. Isomeric and Structural Impacts on Electron Acceptability of Carbon Cages in Atom-Bridged Fullerene Dimers

Author

Sun, Baoyun, primary, Ren, Tongxiang, additional, Miao, Xiaopei, additional, Dai, Fucai, additional, Jin, Long, additional, Yuan, Hui, additional, Xing, Gengmei, additional, Li, Meixian, additional, Dong, Jinquan, additional, Chang, Fei, additional, Hu, Jingbo, additional, Chen, Hao, additional, Zhao, Feng, additional, Gao, Xueyun, additional, and Zhao, Yuliang, additional

Published
2007
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21. Electrochemical synthesis of a ferrocenecarboxylic acid–C60 composite and its electrocatalysis to hydrogen peroxide

Author

Miao, Xiaopei, Liu, Lu, Wang, Shukuan, Lin, Hong, Sun, Baoyun, Hu, Jingbo, and Li, Meixian

Subjects
*CARBOXYLIC acids, *ORGANIC synthesis, *ELECTROCATALYSIS, *HYDROGEN peroxide, *FERROCENE, *CARBON electrodes, *ELECTROLYTE solutions, *COMPOSITE materials
Abstract

Abstract: A new ferrocenecarboxylic acid–C60 composite (Fc–C60) has been synthesized by controlled potential electrolysis. A composite modified glassy carbon electrode has been prepared based on its good electrochemical activity. The modified electrode in 0.1M NaClO4 solution shows a reversible oxidation wave at E 1/2 =0.32V (vs. SCE) attributed to the oxidation of the ferrocene entity and a quasi-reversible reduction wave of C60 entity at E 1/2 =−0.54V (vs. SCE). Electrocatalytic studies show that Fc–C60 at the modified electrode can mediate the reduction of hydrogen peroxide (H2O2), and a broad linear range from 1.2μM to 21.9mM for H2O2 were obtained with a determination limit of 2.5×10−7 M by amperometry. [Copyright &y& Elsevier]

Published
2010
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23. Electrochemistry of symmetrical fullerene dimer C121 film modified electrodes

Author

Miao, Xiaopei, Ren, Tongxiang, Sun, Nijuan, Hu, Jingbo, Zhu, Zhiwei, Shao, Yuanhua, Sun, Baoyun, Zhao, Yuliang, and Li, Meixian

Subjects
*FULLERENE thin films, *ELECTROCHEMISTRY, *DIMERS, *ELECTRODES, *ACETONITRILE, *OXIDATION-reduction reaction, *BROMIDES, *ELECTROLYTE solutions
Abstract

Abstract: C121 and C121/didodecyldimethylammonium bromide (DDAB) film modified electrodes have been constructed and their electrochemistry has been studied. In the acetonitrile solution containing 0.1M tetrabutylammonium perchlorate, the C121 films show three couples of relatively stable redox peaks corresponding to three two-electron transfer processes involving reduction of two fullerene units in the dimers. In an aqueous solution containing 0.1M tetrabutylammonium bromide, the C121 films display an irreversible reduction peak, whereas the C121/DDAB films display two couples of quasi-reversible redox peaks with the splitting first peak, and the C121/DDAB films have good reversibility and stability in the aqueous solution due to existence of DDAB. All of these experimental results indicate that voltammetric behaviors of the C121 films are different from those of C60 films due to different structures though C121 is carbon-bridged C60 dimer, and the common characteristics are that their electrochemical behaviors are dependent on the nature of solvent and cation of supporting electrolyte. Furthermore, electrocatalysis of H2O2 at the C121/DDAB films was explored in the aqueous solution, which indicates that C121 is a good electron-transfer mediator. [Copyright &y& Elsevier]

Published
2009
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24. Isomeric and Structural Impacts on Electron Acceptability of Carbon Cages in Atom-Bridged Fullerene Dimers

Author

Sun, Baoyun, Ren, Tongxiang, Miao, Xiaopei, Dai, Fucai, Jin, Long, Yuan, Hui, Xing, Gengmei, Li, Meixian, Dong, Jinquan, Chang, Fei, Hu, Jingbo, Chen, Hao, Zhao, Feng, Gao, Xueyun, and Zhao, Yuliang

Abstract

The electrochemical properties of the carbon-bridged fullerene dimers C121(I), C121(II), C121(III), C131, and C141were characterized systematically for the first time in this study. Cyclic voltammogram and differential pulse voltammogram analyses revealed that they first underwent three reversible fullerene-unit-based reduction processes where each of the two carbon cages accepted one electron in each step and then possessed a different deep reduction sequence from the fourth to sixth reduction potentials of the fullerene cages. The electronic interactions between cages in the atom-bridged dimers (e.g., C60−C−C60) were found to be different from those of dimers in which two cages were connected directly. Comparison studies of the redox properties of the five dimers revealed that the C60dimerization via 5.6−6.6 connection influenced the cage electron acceptability much more than that of 5.6−5.6 or 6.6−6.6 connections and the dimerization with C70cages influenced the reduction potentials of dimerized products more potently than that with C60cages. Further results from controlled potential electrolysis, high-performance liquid chromatography, matrix-assisted laser desorption and ionization time-of-flight mass spectrometry, ultraviolet absorption spectral analyses demonstrated the reduction processes and a dissociation of the dimers based on reductions. The theoretical understanding of the experiments was investigated by using time-dependent density functional calculations for the ionic states of C121(I, II, III)n-with n0, 1, 2, 3, or 4.

Published
2008
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