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MgO-templated nitrogen-containing carbons derived from different organic compounds for capacitor electrodes

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Title: MgO-templated nitrogen-containing carbons derived from different organic compounds for capacitor electrodes
Authors: Konno, Hidetaka Browse this author →KAKEN DB
Onishi, Hiroaki Browse this author
Yoshizawa, Noriko Browse this author
Azumi, Kazuhisa Browse this author →KAKEN DB
Keywords: Electrochemical capacitor
Carbon containing nitrogen
MgO template method
Issue Date: 15-Jan-2010
Publisher: Elsevier B.V.
Journal Title: Journal of Power Sources
Volume: 195
Issue: 2
Start Page: 667
End Page: 673
Publisher DOI: 10.1016/j.jpowsour.2009.07.039
Abstract: Carbons containing nitrogen (C-N composites) were derived from three commercial organic compounds, poly(vinylpyrrolidone) (PVP), polyacrylamide (PAA), and trimethylolmelamine (TMM) using the MgO template method. The C-N composites formed in nitrogen at 700-1000℃ had nitrogen content, W_[N], of 3-23 mass% and the specific surface area by N2 adsorption, S_[BET], of 60-2000 m2 g^[-1] without activation. Generally high nitrogen content of the starting compound led to larger W_[N], but W_[N] was not proportional to the N/C mole ratio in the compounds. The value of S_[BET] strongly depended on the compound: S_[BET] (PVP) > S_[BET] (PAA) >> S_[BET] (TMM). There was a tendency for W_[N] to decrease with increasing S_[BET]. The capacitance measured in 1 mol dm^[-3] H2SO4 by cyclic voltammetry, C_[M] in F g^[-1], suggested that both W_[N] and S_[BET] are influential in gaining large C_[M]. For the composites with W_[N] > 5 mass%, the capacitance normalized by S_[BET], C_[A] = C_[M]/S_[BET], was 0.17-0.65 F m^[-2], which was larger than the electric double layer capacitance (0.05-0.15 F m^[-2]), indicating that the pseudo-capacitance contributes significantly to C_[M]. The value of C_[A] increased with increasing W_[N], but a correlation between C_[A] and particular nitrogen species on the surface measured by XPS was obscure. It was suggested that the large C_[A] is not simply explained by redox reactions of the surface functional groups. The composite derived from PAA at 900℃ showed 234 F g^[-1] at 2 mV s^[-1] and 181 F g^[-1] at 100 mV s^[-1] with acceptable yield of the composite.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 金野 英隆

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