Nitrogen Doped Superactivated Carbons Prepared at Mild Conditions as Electrodes for Supercapacitors in Organic Electrolyte

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Emilia Morallón¹  María José Mostazo-López²  Ramiro Ruiz-Rosas²  Diego Cazorla-Amorós²  Tomomi Tagaya³  Yoshikiyo Hatakeyama³  Soshi Shiraishi³ 

[1] Departamento de Química Física and Instituto Universitario de Materiales, Universidad de Alicante, Apartado 99, 03080-Alicante, Spain;Departamento de Química Inorgánica and Instituto Universitario de Materiales, Universidad de Alicante, Apartado 99, 03080-Alicante, Spain;Division of Molecular Science, Graduate School of Science and Technology, Gunma University, 376–8515 Gunma, Japan;

关键词: electric double layer capacitor;    porous carbon;    nitrogen doping;    surface chemistry;   

DOI  :  10.3390/c6030056

来源: DOAJ

【 摘 要 】

Nitrogen functionalization of a highly microporous activated carbon (S_BET > 3000 m²/g), to be used as electrode of electric double layer capacitor (EDLC), was carried out by different methods based on organic chemistry protocols at low temperature and selective thermal post-treatments under inert atmosphere. The combination of both methods allowed the production of carbon materials with very similar surface area (2400–3000 m²/g) and different surface chemistry. The nitrogen functionalization by chemical methods produce the attachment of 4 at. % N (XPS) by consumption of oxygen functional groups. The thermal treatments rearrange the surface chemistry by decreasing and converting both nitrogen and oxygen moieties. The effect of surface chemistry on the performance of these materials as electrodes for symmetric supercapacitors was analyzed in organic electrolyte (1M TEMABF₄/propylene carbonate). The devices showed high gravimetric capacitance (37–40 F/g) and gravimetric energy density (31–37 Wh/kg). The electrochemical stability of the EDLC was evaluated by a floating test under severe conditions of voltage and temperature. The results evidence an improvement of the durability of nitrogen-doped activated carbons modified by chemical treatments due to the decrease of detrimental oxygen functionalities and the generation of nitrogen groups with higher electrochemical stability.

【 授权许可】

Unknown