TY - JOUR
T1 - Ultraporous nitrogen-doped zeolite-templated carbon for high power density aqueous-based supercapacitors
AU - Mostazo-López, María José
AU - Ruiz-Rosas, Ramiro
AU - Castro-Muñiz, Alberto
AU - Nishihara, Hirotomo
AU - Kyotani, Takashi
AU - Morallón, Emilia
AU - Cazorla-Amorós, Diego
N1 - Funding Information:
The authors would like to thank GV and FEDER ( PROMETEOII/2014/010 ), projects CTQ2015-66080-R ( MINECO/FEDER ) and MAT2016-76595-R ( MINECO/FEDER ) for financial support. MJML acknowledges Generalitat Valenciana for the financial support through a VALi+d contract ( ACIF/2015/374 ).
Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2018/4
Y1 - 2018/4
N2 - Two zeolite templated carbons (ZTC) with comparable structure and different surface chemistry have been synthesized by chemical vapor deposition of different precursors, producing a non-doped and a N-doped carbon material (4 at. % XPS) in which most of the functionalities are quaternary N. A larger specific capacitance (farads per surface area) has been measured in acid electrolyte for the N-doped ZTC, that can be related to an improved wettability due to the presence of nitrogen and oxygen. The capacitance of N-doped ZTC is lower in alkaline electrolyte, probably due to the loss of electrochemical activity of certain oxygen functionalities. Interestingly, the electro-oxidation process of N-ZTC implies lower irreversible currents (providing higher electrochemical stability) than for ZTC. The presence of quaternary nitrogen greatly improves the electric conductivity of N-ZTC, which shows a superior rate performance. ZTC and N-ZTC capacitors were constructed using 1 M H2SO4. Under the same conditions, N-doped ZTC based capacitor has higher energy density, 6.7 vs 5.9 W h/kg. The power density of N-ZTC is four times higher, producing an outstanding maximum power of 98 kW/kg. These results provide clear evidences of the advantages of doping advanced porous carbon materials with nitrogen functionalities.
AB - Two zeolite templated carbons (ZTC) with comparable structure and different surface chemistry have been synthesized by chemical vapor deposition of different precursors, producing a non-doped and a N-doped carbon material (4 at. % XPS) in which most of the functionalities are quaternary N. A larger specific capacitance (farads per surface area) has been measured in acid electrolyte for the N-doped ZTC, that can be related to an improved wettability due to the presence of nitrogen and oxygen. The capacitance of N-doped ZTC is lower in alkaline electrolyte, probably due to the loss of electrochemical activity of certain oxygen functionalities. Interestingly, the electro-oxidation process of N-ZTC implies lower irreversible currents (providing higher electrochemical stability) than for ZTC. The presence of quaternary nitrogen greatly improves the electric conductivity of N-ZTC, which shows a superior rate performance. ZTC and N-ZTC capacitors were constructed using 1 M H2SO4. Under the same conditions, N-doped ZTC based capacitor has higher energy density, 6.7 vs 5.9 W h/kg. The power density of N-ZTC is four times higher, producing an outstanding maximum power of 98 kW/kg. These results provide clear evidences of the advantages of doping advanced porous carbon materials with nitrogen functionalities.
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U2 - 10.1016/j.carbon.2017.12.050
DO - 10.1016/j.carbon.2017.12.050
M3 - Article
AN - SCOPUS:85038872975
VL - 129
SP - 510
EP - 519
JO - Carbon
JF - Carbon
SN - 0008-6223
ER -