Nitrogen-rich green leaves of papaya and Coccinia grandis as precursors of activated carbon and their electrochemical properties
Activated carbon (AC) was synthesized from papaya and Coccinia grandis leaves (PL-AC and CL-AC, respectively) which are nitrogen-rich precursors and their electrochemical properties were investigated. The synthesis process included carbonization at 400 °C, impurity removal by H 2 SO 4 cleaning, and...
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Published in | RSC advances Vol. 7; no. 67; pp. 4264 - 4272 |
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Main Authors | , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
01.01.2017
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Abstract | Activated carbon (AC) was synthesized from papaya and
Coccinia grandis
leaves (PL-AC and CL-AC, respectively) which are nitrogen-rich precursors and their electrochemical properties were investigated. The synthesis process included carbonization at 400 °C, impurity removal by H
2
SO
4
cleaning, and post activation by NaOH at 720 °C. Surpassing the conventional bamboo-derived AC (B-AC), PL- and CL-ACs show relatively high surface areas of 2664 and 2576 m
2
g
−1
, respectively. Moreover, the nitrogen contents in the PL- and CL-ACs were approximately 2.3 and 1.8 at%, respectively. Furthermore, the electrochemical properties of the synthesized PL- and CL-ACs were investigated using both aqueous and organic electrolytes. The specific capacitances of the PL- and CL-ACs were 98.47 and 89.91 F g
−1
, respectively, in Na
2
SO
4
electrolyte. Especially, compared to the B-AC, the PL-AC shows a dramatic decrease in series resistances (
R
S
) from 1.33 to 0.53 Ω and charge transfer resistances (
R
CT
) from 25.83 to 9.00 Ω. The decrease of
R
S
and
R
CT
is attributed to the existence of nitrogen in the PL-AC, resulting in a higher conductivity of electrode material and an enhancement of the charge transfer between electrode material and electrolyte. The large surface area of the PL- and CL-ACs was successfully achieved without detriment to the electrical conductivity. These results suggest that nitrogen-rich PL and CL are potential precursors for the synthesis of nitrogen-doped AC in a one-step process, which can be used as an alternative electrode material for electrochemical capacitors and can potentially be applied for large-scale industrial production with low cost.
Activated nitrogen-rich green leaves of papaya and
Coccinia grandis
show high surface area without the detriment of the electric conductivity. |
---|---|
AbstractList | Activated carbon (AC) was synthesized from papaya and
Coccinia grandis
leaves (PL-AC and CL-AC, respectively) which are nitrogen-rich precursors and their electrochemical properties were investigated. The synthesis process included carbonization at 400 °C, impurity removal by H
2
SO
4
cleaning, and post activation by NaOH at 720 °C. Surpassing the conventional bamboo-derived AC (B-AC), PL- and CL-ACs show relatively high surface areas of 2664 and 2576 m
2
g
−1
, respectively. Moreover, the nitrogen contents in the PL- and CL-ACs were approximately 2.3 and 1.8 at%, respectively. Furthermore, the electrochemical properties of the synthesized PL- and CL-ACs were investigated using both aqueous and organic electrolytes. The specific capacitances of the PL- and CL-ACs were 98.47 and 89.91 F g
−1
, respectively, in Na
2
SO
4
electrolyte. Especially, compared to the B-AC, the PL-AC shows a dramatic decrease in series resistances (
R
S
) from 1.33 to 0.53 Ω and charge transfer resistances (
R
CT
) from 25.83 to 9.00 Ω. The decrease of
R
S
and
R
CT
is attributed to the existence of nitrogen in the PL-AC, resulting in a higher conductivity of electrode material and an enhancement of the charge transfer between electrode material and electrolyte. The large surface area of the PL- and CL-ACs was successfully achieved without detriment to the electrical conductivity. These results suggest that nitrogen-rich PL and CL are potential precursors for the synthesis of nitrogen-doped AC in a one-step process, which can be used as an alternative electrode material for electrochemical capacitors and can potentially be applied for large-scale industrial production with low cost. Activated carbon (AC) was synthesized from papaya and Coccinia grandis leaves (PL-AC and CL-AC, respectively) which are nitrogen-rich precursors and their electrochemical properties were investigated. The synthesis process included carbonization at 400 °C, impurity removal by H 2 SO 4 cleaning, and post activation by NaOH at 720 °C. Surpassing the conventional bamboo-derived AC (B-AC), PL- and CL-ACs show relatively high surface areas of 2664 and 2576 m 2 g −1 , respectively. Moreover, the nitrogen contents in the PL- and CL-ACs were approximately 2.3 and 1.8 at%, respectively. Furthermore, the electrochemical properties of the synthesized PL- and CL-ACs were investigated using both aqueous and organic electrolytes. The specific capacitances of the PL- and CL-ACs were 98.47 and 89.91 F g −1 , respectively, in Na 2 SO 4 electrolyte. Especially, compared to the B-AC, the PL-AC shows a dramatic decrease in series resistances ( R S ) from 1.33 to 0.53 Ω and charge transfer resistances ( R CT ) from 25.83 to 9.00 Ω. The decrease of R S and R CT is attributed to the existence of nitrogen in the PL-AC, resulting in a higher conductivity of electrode material and an enhancement of the charge transfer between electrode material and electrolyte. The large surface area of the PL- and CL-ACs was successfully achieved without detriment to the electrical conductivity. These results suggest that nitrogen-rich PL and CL are potential precursors for the synthesis of nitrogen-doped AC in a one-step process, which can be used as an alternative electrode material for electrochemical capacitors and can potentially be applied for large-scale industrial production with low cost. Activated nitrogen-rich green leaves of papaya and Coccinia grandis show high surface area without the detriment of the electric conductivity. |
Author | Yoshida, Ichiro Aoyama, Takaaki Endo, Morinobu Dulyaseree, Paweena Toya, Yumiko Fujishige, Masatsugu Tanaka, Yu-suke Banba, Yasuo Takeuchi, Kenji Wongwiriyapan, Winadda Phonyiem, Mayuree |
AuthorAffiliation | Shinshu University Institute of Carbon Science and Technology Interdisciplinary Graduate School of Science and Technology College of Nanotechnology King Mongkut's Institute of Technology Ladkrabang |
AuthorAffiliation_xml | – name: College of Nanotechnology – name: Interdisciplinary Graduate School of Science and Technology – name: King Mongkut's Institute of Technology Ladkrabang – name: Institute of Carbon Science and Technology – name: Shinshu University |
Author_xml | – sequence: 1 givenname: Paweena surname: Dulyaseree fullname: Dulyaseree, Paweena – sequence: 2 givenname: Masatsugu surname: Fujishige fullname: Fujishige, Masatsugu – sequence: 3 givenname: Ichiro surname: Yoshida fullname: Yoshida, Ichiro – sequence: 4 givenname: Yumiko surname: Toya fullname: Toya, Yumiko – sequence: 5 givenname: Yasuo surname: Banba fullname: Banba, Yasuo – sequence: 6 givenname: Yu-suke surname: Tanaka fullname: Tanaka, Yu-suke – sequence: 7 givenname: Takaaki surname: Aoyama fullname: Aoyama, Takaaki – sequence: 8 givenname: Mayuree surname: Phonyiem fullname: Phonyiem, Mayuree – sequence: 9 givenname: Winadda surname: Wongwiriyapan fullname: Wongwiriyapan, Winadda – sequence: 10 givenname: Kenji surname: Takeuchi fullname: Takeuchi, Kenji – sequence: 11 givenname: Morinobu surname: Endo fullname: Endo, Morinobu |
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Coccinia grandis
leaves (PL-AC and CL-AC, respectively) which are nitrogen-rich precursors and their... |
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