Non-Isothermal Decomposition Kinetics of Various Carbon Allotropes under Air Atmosphere. (2017)

• Record Type: Journal Article
• Authors: Rani, Versha; Srivastava, R.C.; Agarwal, H.M; Zaidi, M.G.H.
• Is Part Of: Materials today. Volume 4:Number 9(2017)
• Page Start: 9471
• Page End: 9475
• Publication Date: 2017
• Subjects: Non-isothermal decomposition -- Coats–Redfern -- Horowitz-Metzger method; Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2017.06.206
• Languages: English
• ISSNs: 2214-7853

Abstract

Abstract: Kinetics analysis for non-isothermal decomposition of various carbon allotropes was studied in the temperature range (25°C-1000°C) in static air using thermo gravimetric techniques (TGA).In the present study the data was analyzed using various solid state reaction models. Integral method using Coats–Redfern and Horowitz-Metzger equations were applied in dynamic data analysis. The activation energy (E∗), frequency factor (A), change in Entropy (ΔS), change in Enthalpy (ΔH) and change in Gibbs free energy (ΔF) for carbon allotropes (graphite, graphene-oxide, nanotubes (SWCNTs, MWCNTs) and fullerene) were evaluated. All these allotropes have shown one step decomposition behaviour while graphene-oxide has shown two step decomposition. It was also observed that among all these allotropes, graphite is the most stable.