Fe2O3/氮掺杂石墨烯复合材料的热分解动力学

对Fe₂O₃/氮掺杂石墨烯（NG）的热解行为进行热重研究，分析出物质的热分解特性和机理函数。通过水热法制备Fe₂O₃/NG样品，在氮气氛围的保护下分别以5、10、15、20 K/min的升温速率线性升温到1 473.15 K。使用Kissinger Akahira and Sunose（KAS）、Flynn-Wall-Ozawa（FWO）两种“model free”方法和Coats-Redfern模型拟合法进行热动力学拟合，结果表明：FWO和KAS两种拟合法估算的表观活化能变化范围分别为404.08~424.65 kJ/mol和405.52~427.10 kJ/mol，且表观活化能随着转化率的增大而增加；FWO和KAS两种拟合法估算的表观活化能平均值分别为410.92 kJ/mol和412.74 kJ/mol，相差0.4%；Mample Power（P3）是最能反映Fe₂O₃/NG分解机理的函数。

Kinetic study of the thermal decomposition of Fe2O3/nitrogen-doped graphene(NG) composites

The thermal decomposition behavior of Fe₂O₃/nitrogen-doped graphene (NG) composites, a potential anode material for supercapacitors, has been investigated by TG analysis. The Fe₂O₃/NG samples were prepared by a hydrothermal method, with the temperature increased to 1 473.15 K at different heating rates of 5, 10, 15 and 20 K/min under nitrogen. The thermal decomposition characteristics of the composites and the reaction mechanism were analyzed. “Model-free” methods including the Kissinger-Akahira-Sunose (KAS) method and the Flynn-Wall-Ozawa (FWO) method and the Coats-Redfern model fitting method were employed to estimate key parameters. For the FWO and KAS methods, the activation energies increase monotonically from 404.08 kJ/mol to 424.65 kJ/mol and 405.52 kJ/mol to 427.10 kJ/mol, respectively. The average activation energies values for the two cases are 410.92 kJ/mol and 412.74 kJ/mol, respectively, with a discrepancy of 0.4%. The Mample Power (P3) rule best reflects the dynamics of the true chemical process in the Fe₂O₃/NG decomposition reaction.