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High capacitance B/C/N composites for capacitor electrodes synthesized by a simple method

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Title: High capacitance B/C/N composites for capacitor electrodes synthesized by a simple method
Authors: Konno, Hidetaka Browse this author →KAKEN DB
Ito, Teruhiko Browse this author
Ushiro, Mariko Browse this author
Fushimi, Koji Browse this author →KAKEN DB
Azumi, Kazuhisa Browse this author →KAKEN DB
Keywords: B/C/N composite
Boric acid
B-N bond
Issue Date: 15-Mar-2010
Publisher: Elsevier B.V.
Journal Title: Journal of Power Sources
Volume: 195
Issue: 6
Start Page: 1739
End Page: 1746
Publisher DOI: 10.1016/j.jpowsour.2009.09.072
Abstract: The B/C/N composites were synthesized by a very simple method, that is, carbonization at HTT = 800-1200℃ of the precursor prepared by drying a solution mixture of polyacrylamide and boric acid, followed by boiling in water to remove borate by-products. The amount of insoluble B species in the composite increased linearly from 4.8 to 18.6 mass% with raising HTT. The XRD and FT-IR revealed that turbostratic h-BN started to form at around 1000℃ as a by-product. By XPS, major B and N components in the composite were >B-N< bond, C-B-O type B, pyridinic N, pyrrolic N, and quaternary N. A fraction for >B-N< bond including h-BN in the total B or N components increased with raising HTT and it exceeded 50 at% between 900 and 1000℃. It was suggested that in the composites formed at HTT > 1000℃ the amounts of h-BN increased, leading to reduction in other B and N components. The S_[BET] was almost unchanged up to 1000℃, 410-420 m2 g^[-1]. Large and broad redox peaks arisen from plural reactions appeared in the cyclic voltammogram (CV) measured in 1 mol dm^[-3] H2SO4 for the composites formed at HTT ≤ 1000℃. These peaks disappeared in 1 mol dm^[-3] solutions of Na2SO4 and Li2SO4. By comparing CV with that for C/N composite formed from PAA by the MgO template method, the pseudocapacitance owing to reactions of >B-N< and C-B-O components with protons was found to be added to commonly observed pseudo-capacitance for nitrogen-doped carbons. The capacitances for the composites formed at 850-950℃ exceeded 300 Fg^[-1] at 2 mV s^[-1] in the acid electrolyte and the retention at 50 mV s^[-1] was 78-80%. The shape of CV in the neutral electrolytes was trapezoid and the current density increased with lowering potential, suggesting adsorption and desorption of Na+ and Li+ ions. This was considered to be due to doped nitrogen, indicating the development of pseudo-capacitance. The capacitance per S_[BET] was 0.33-0.74 F m^[-2] and 0.17-0.32 F m^[-2], larger for lower HTT, in the acid and neutral electrolytes, respectively.
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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