Kinetic Analysis of Oxidation of Carbon Nanotubes, C60 and Graphite Using Mechanism-Function Method

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Kinetic Analysis of Oxidation of Carbon Nanotubes, C60 and Graphite Using Mechanism-Function Method

Lü Deyi^a; XU Ke^a; XU Zhude^b; GE Zhonghua^a; LI Xiaonian^a

a State Key Laboratory Breeding Base of Green-chemistry Synthesis Technology, Resources ＆ Environment Catalysis Institute, Zhejiang University of Technology, Hangzhou 310032, China b Department of Chemistry, Zhejiang University, Hangzhou 3100271, China

Received:1900-01-01 Revised:1900-01-01 Online:2005-06-28 Published:2005-06-28
Contact: LU Deyi

碳纳米管及C₆₀和石墨氧化动力学机理函数的分析

吕德义^a; 许可^a; 徐铸德^b; 葛忠华^a; 李小华^a

^a State Key Laboratory Breeding Base of Green-chemistry Synthesis Technology, Resources ＆ Environment Catalysis Institute, Zhejiang University of Technology, Hangzhou 310032, China ^b Department of Chemistry, Zhejiang University, Hangzhou 3100271, China

通讯作者: 吕德义

Abstract

Abstract: The oxidation of carbon nanotubes, C60 and graphite was studied by thermogravimetric (TG) analysis and differential thermal analysis (DTA) technique, and the oxidation kinetic models of three carbon materials studied were analyzed by mechanism-function method. The results indicate that three carbon species adopt different oxidation mechanisms due to their different structures. The oxidation of carbon nanotubes with cylindrical structure follows contracting volume reaction mechanism [R3 mechanism, 1- (1- α)^1/3 = kt], indicating that the oxidation of carbon nanotubes takes place from the ends to the center. For graphite with planar sandwich structure, the oxidation starts at the edges initially and gradually moves toward the center, which corresponds to contracting area phase boundary reaction mechanism [R2 mechanism, 1 - (1 - α)^1/2 = kt]. The oxidation of C60 with spherical structure, however, is complex and apparently cannot be illustrated with a single kinetic model. The values of apparent activation energy obtained by the mechanism-function method are (145 ± 5) kJ·mol^-1 for carbon nanotubes and (193 ± 7) kJ·mol^-1 for graphite, respectively, while the value of apparent activation energy for C60 determined using Kissinger method is 91 kJ·mol^-1。

Key words: oxidation mechanism, carbon nanotubes, kinetic analysis, activation energy

摘要： The oxidation of carbon nanotubes, C60 and graphite was studied by thermogravimetric (TG) analysis and differential thermal analysis (DTA) technique, and the oxidation kinetic models of three carbon materials studied were analyzed by mechanism-function method. The results indicate that three carbon species adopt different oxidation mechanisms due to their different structures. The oxidation of carbon nanotubes with cylindrical structure follows contracting volume reaction mechanism [R3 mechanism, 1- (1- α)^1/3 = kt], indicating that the oxidation of carbon nanotubes takes place from the ends to the center. For graphite with planar sandwich structure, the oxidation starts at the edges initially and gradually moves toward the center, which corresponds to contracting area phase boundary reaction mechanism [R2 mechanism, 1 - (1 - α)^1/2 = kt]. The oxidation of C60 with spherical structure, however, is complex and apparently cannot be illustrated with a single kinetic model. The values of apparent activation energy obtained by the mechanism-function method are (145 ± 5) kJ·mol^-1 for carbon nanotubes and (193 ± 7) kJ·mol^-1 for graphite, respectively, while the value of apparent activation energy for C60 determined using Kissinger method is 91 kJ·mol^-1。

关键词: C60;碳纳米管;氧化作用;动力学分析;石墨

Lü Deyi, XU Ke, XU Zhude, GE Zhonghua, LI Xiaonian. Kinetic Analysis of Oxidation of Carbon Nanotubes, C60 and Graphite Using Mechanism-Function Method[J]. .

吕德义,许可,徐铸德,葛忠华,李小华. 碳纳米管及C₆₀和石墨氧化动力学机理函数的分析[J]. CIESC Journal.

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