TY - JOUR
T1 - Glucose-derived activated carbons for supercapacitors
T2 - comparison between single O doping and N/O co-doping
AU - Cai, Xinyu
AU - Xiao, Yan
AU - Sun, Wei
AU - Yang, Fuqian
N1 - Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/2/20
Y1 - 2022/2/20
N2 - Single O-doped and N/O co-doped activated carbons (ACs) are prepared via hydrothermal synthesis (HTS) and a subsequent KOH activation with glucose as precursor and egg solution as nitrogen source. Controlling the activation temperature and mass ratio of activation agent KOH to HTS product (biochar), we tailor the surface area, porous structure as well as the amounts of heteroatoms of the prepared ACs. Using 6 M KOH solution as electrolyte, the electrochemical properties of all the prepared ACs are analyzed. For the same activation parameters, the single O-doped ACs exhibit very similar porous structure and possess a higher heteroatom amount than the N/O co-doped ACs. The N/O co-doped ACs exhibit superior capacitive behavior to the corresponding single O-doped ACs and achieve a specific capacitance of 417 F/g at a current density of 0.5 A/g and 334 F/g at 20 A/g. This work demonstrates a cheap and green route to produce high-performance ACs and helps to have a deeper understanding of the effects of the heteroatoms on the electrochemical properties of ACs.
AB - Single O-doped and N/O co-doped activated carbons (ACs) are prepared via hydrothermal synthesis (HTS) and a subsequent KOH activation with glucose as precursor and egg solution as nitrogen source. Controlling the activation temperature and mass ratio of activation agent KOH to HTS product (biochar), we tailor the surface area, porous structure as well as the amounts of heteroatoms of the prepared ACs. Using 6 M KOH solution as electrolyte, the electrochemical properties of all the prepared ACs are analyzed. For the same activation parameters, the single O-doped ACs exhibit very similar porous structure and possess a higher heteroatom amount than the N/O co-doped ACs. The N/O co-doped ACs exhibit superior capacitive behavior to the corresponding single O-doped ACs and achieve a specific capacitance of 417 F/g at a current density of 0.5 A/g and 334 F/g at 20 A/g. This work demonstrates a cheap and green route to produce high-performance ACs and helps to have a deeper understanding of the effects of the heteroatoms on the electrochemical properties of ACs.
KW - Activated carbons
KW - Egg solution
KW - Heteroatom doping
KW - Hydrothermal process
KW - Supercapacitor
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U2 - 10.1016/j.electacta.2022.139861
DO - 10.1016/j.electacta.2022.139861
M3 - Article
AN - SCOPUS:85122534816
SN - 0013-4686
VL - 406
JO - Electrochimica Acta
JF - Electrochimica Acta
M1 - 139861
ER -