Nitrogen-doped carbon monolith for alkaline supercapacitors and understanding nitrogen-induced redox transitions
Article
Article Title | Nitrogen-doped carbon monolith for alkaline supercapacitors and understanding nitrogen-induced redox transitions |
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ERA Journal ID | 1329 |
Article Category | Article |
Authors | Wang, Da-Wei (Author), Li, Feng (Author), Yin, Li-Chang (Author), Lu, Xu (Author), Chen, Zhi-Gang (Author), Gentle, Ian R. (Author), Lu, Gao Qing (Max) (Author) and Cheng, Hui-Ming (Author) |
Journal Title | Chemistry: A European Journal |
Journal Citation | 18 (17), pp. 5345-5351 |
Number of Pages | 7 |
Year | 2012 |
Place of Publication | Germany |
ISSN | 0947-6539 |
1521-3765 | |
Digital Object Identifier (DOI) | https://doi.org/10.1002/chem.201102806 |
Web Address (URL) | http://onlinelibrary.wiley.com/doi/10.1002/chem.201102806/epdf |
Abstract | A nitrogen-doped porous carbon monolith was synthesized as a pseudo-capacitive electrode for use in alkaline supercapacitors. Ammonia-assisted carbonization was used to dope the surface with nitrogen heteroatoms in a way that replaced carbon atoms but kept the oxygen content constant. Ammonia treatment expanded the micropore size-distributions and increased the specific surface area from 383 m 2 g -1 to 679 m 2 g -1. The nitrogen-containing porous carbon material showed a higher capacitance (246 F g -1) in comparison with the nitrogen-free one (186 F g -1). Ex situ electrochemical spectroscopy was used to investigate the evolution of the nitrogen-containing functional groups on the surface of the N-doped carbon electrodes in a three-electrode cell. In addition, first-principles calculations were explored regarding the electronic structures of different nitrogen groups to determine their relative redox potentials. We proposed possible redox reaction pathways based on the calculated redox affinity of different groups and surface analysis, which involved the reversible attachment/detachment of hydroxy groups between pyridone and pyridine. The oxidation of nitrogen atoms in pyridine was also suggested as a possible reaction pathway. |
Keywords | carbon; doping; microporous materials; redox chemistry; supercapacitors; ammonia treatment; carbon atoms; carbon electrode; carbon monoliths; ex situ; first-principles calculation; heteroatoms; hydroxy groups; micropores; N-doped; nitrogen atom; nitrogen group; nitrogen-doped; oxygen content; porous carbon materials; porous carbons; pyridones; reaction pathways; redox chemistry; redox potentials; redox transition; super capacitor; three electrode cells; applied mathematics; chemical products generally; chemical reactions; applied physics generally; chemical plants and equipment; computer software, data handling and applications; computer circuits and logic elements; chemistry |
ANZSRC Field of Research 2020 | 340399. Macromolecular and materials chemistry not elsewhere classified |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Chinese Academy of Sciences, China |
University of Queensland | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q4188/nitrogen-doped-carbon-monolith-for-alkaline-supercapacitors-and-understanding-nitrogen-induced-redox-transitions
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