N-Doped hierarchical porous carbon prepared by simultaneous-activation of KOH and NH3 for high performance supercapacitorsElectronic supplementary information (ESI) available: Schematic illustration of preparation of AKPC-750; XPS spectra and electrochemical performance of the APC-750 and APC-750; detail information of control samples. See DOI: 10.1039/c6ra22426a
Hemp stem, a biomass waste, has been successfully explored as a green carbon source to prepare advanced N-doped hierarchical porous carbon by means of KOH pre-treatment and direct pyrolysis under NH 3 flow. The NH 3 flow can not only promote the activation of carbon but also bring nitrogen into the...
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description | Hemp stem, a biomass waste, has been successfully explored as a green carbon source to prepare advanced N-doped hierarchical porous carbon by means of KOH pre-treatment and direct pyrolysis under NH
3
flow. The NH
3
flow can not only promote the activation of carbon but also bring nitrogen into the carbon framework. The simultaneous-activation of KOH and NH
3
can enhance the specific surface area, nitrogen content and electrical conductivity, significantly affecting the electrochemical performance for supercapacitors. The as-prepared sample with a high specific surface area (1949 m
2
g
−1
), high nitrogen content (4.4 wt%), hierarchical porosity and high electrical conductivity (3.5 S cm
−1
), exhibits remarkable electrochemical performance as a supercapacitor electrode material, such as a high specific capacitance of 352 F g
−1
, outstanding rate capability and excellent cycling stability (96.3% retention after 10 000 cycles at 5 A g
−1
) in 6 M KOH electrolyte. In addition, the as-assembled symmetric supercapacitor delivers an ultrahigh energy density of 99.5 W h kg
−1
in an ionic liquid system. Moreover, a value of 27.7 W h kg
−1
is still maintained even at a high power density of 22 000 W kg
−1
. More interestingly, the supercapacitor can light up a red light-emitting-diode for more than 8 minutes after being charged for only 4.4 seconds.
Hemp stem simultaneously-activated by KOH and NH
3
for high performance supercapacitors. |
doi_str_mv | 10.1039/c6ra22426a |
format | Article |
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3
flow. The NH
3
flow can not only promote the activation of carbon but also bring nitrogen into the carbon framework. The simultaneous-activation of KOH and NH
3
can enhance the specific surface area, nitrogen content and electrical conductivity, significantly affecting the electrochemical performance for supercapacitors. The as-prepared sample with a high specific surface area (1949 m
2
g
−1
), high nitrogen content (4.4 wt%), hierarchical porosity and high electrical conductivity (3.5 S cm
−1
), exhibits remarkable electrochemical performance as a supercapacitor electrode material, such as a high specific capacitance of 352 F g
−1
, outstanding rate capability and excellent cycling stability (96.3% retention after 10 000 cycles at 5 A g
−1
) in 6 M KOH electrolyte. In addition, the as-assembled symmetric supercapacitor delivers an ultrahigh energy density of 99.5 W h kg
−1
in an ionic liquid system. Moreover, a value of 27.7 W h kg
−1
is still maintained even at a high power density of 22 000 W kg
−1
. More interestingly, the supercapacitor can light up a red light-emitting-diode for more than 8 minutes after being charged for only 4.4 seconds.
Hemp stem simultaneously-activated by KOH and NH
3
for high performance supercapacitors.</description><identifier>EISSN: 2046-2069</identifier><identifier>DOI: 10.1039/c6ra22426a</identifier><language>eng</language><creationdate>2016-10</creationdate><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27923,27924</link.rule.ids></links><search><creatorcontrib>Guo, Nannan</creatorcontrib><creatorcontrib>Li, Min</creatorcontrib><creatorcontrib>Wang, Yong</creatorcontrib><creatorcontrib>Sun, Xingkai</creatorcontrib><creatorcontrib>Wang, Feng</creatorcontrib><creatorcontrib>Yang, Ru</creatorcontrib><title>N-Doped hierarchical porous carbon prepared by simultaneous-activation of KOH and NH3 for high performance supercapacitorsElectronic supplementary information (ESI) available: Schematic illustration of preparation of AKPC-750; XPS spectra and electrochemical performance of the APC-750 and APC-750; detail information of control samples. See DOI: 10.1039/c6ra22426a</title><description>Hemp stem, a biomass waste, has been successfully explored as a green carbon source to prepare advanced N-doped hierarchical porous carbon by means of KOH pre-treatment and direct pyrolysis under NH
3
flow. The NH
3
flow can not only promote the activation of carbon but also bring nitrogen into the carbon framework. The simultaneous-activation of KOH and NH
3
can enhance the specific surface area, nitrogen content and electrical conductivity, significantly affecting the electrochemical performance for supercapacitors. The as-prepared sample with a high specific surface area (1949 m
2
g
−1
), high nitrogen content (4.4 wt%), hierarchical porosity and high electrical conductivity (3.5 S cm
−1
), exhibits remarkable electrochemical performance as a supercapacitor electrode material, such as a high specific capacitance of 352 F g
−1
, outstanding rate capability and excellent cycling stability (96.3% retention after 10 000 cycles at 5 A g
−1
) in 6 M KOH electrolyte. In addition, the as-assembled symmetric supercapacitor delivers an ultrahigh energy density of 99.5 W h kg
−1
in an ionic liquid system. Moreover, a value of 27.7 W h kg
−1
is still maintained even at a high power density of 22 000 W kg
−1
. More interestingly, the supercapacitor can light up a red light-emitting-diode for more than 8 minutes after being charged for only 4.4 seconds.
Hemp stem simultaneously-activated by KOH and NH
3
for high performance supercapacitors.</description><issn>2046-2069</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><sourceid/><recordid>eNqFUU1PAjEQXU1MJMrFu8l408PifsAa8EQAAyEBkvXgjQzdwa3ptk1bSPj3dkFRY6K9tJP35n2kQXAVR604Srv3LDOYJO0kw9OgkUTtLEyirHseNK19i_zJOnGSxY2TahYOlaYCSk4GDSs5QwFaGbWxwNCslARtSKPxnNUOLK82wqEkj4fIHN-i456j1jCdjwFlAbNxCmtlvOJrCZqMf1coGYHd-ImhRsadMnYkiDmjJGc1ogVVJB2aHXC5X9nr3o7yyR3gFrnAlaAe5KykGmPAhdhYZ47-h5jHsT9dDMKHTvQIL4scrK7NcB-QDsa10KHtt4x-0ZUE_cPunt7_1CnI-Rg_4nk6U9KLCbBY-Q62BTkRDOeTHvz-i8vgbI3CUvPjvgiun0bPg3FoLFtqwytff_lFT__Hb_7Cl7pYp-9iHq3R</recordid><startdate>20161025</startdate><enddate>20161025</enddate><creator>Guo, Nannan</creator><creator>Li, Min</creator><creator>Wang, Yong</creator><creator>Sun, Xingkai</creator><creator>Wang, Feng</creator><creator>Yang, Ru</creator><scope/></search><sort><creationdate>20161025</creationdate><title>N-Doped hierarchical porous carbon prepared by simultaneous-activation of KOH and NH3 for high performance supercapacitorsElectronic supplementary information (ESI) available: Schematic illustration of preparation of AKPC-750; XPS spectra and electrochemical performance of the APC-750 and APC-750; detail information of control samples. See DOI: 10.1039/c6ra22426a</title><author>Guo, Nannan ; Li, Min ; Wang, Yong ; Sun, Xingkai ; Wang, Feng ; Yang, Ru</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-rsc_primary_c6ra22426a3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Guo, Nannan</creatorcontrib><creatorcontrib>Li, Min</creatorcontrib><creatorcontrib>Wang, Yong</creatorcontrib><creatorcontrib>Sun, Xingkai</creatorcontrib><creatorcontrib>Wang, Feng</creatorcontrib><creatorcontrib>Yang, Ru</creatorcontrib></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Guo, Nannan</au><au>Li, Min</au><au>Wang, Yong</au><au>Sun, Xingkai</au><au>Wang, Feng</au><au>Yang, Ru</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>N-Doped hierarchical porous carbon prepared by simultaneous-activation of KOH and NH3 for high performance supercapacitorsElectronic supplementary information (ESI) available: Schematic illustration of preparation of AKPC-750; XPS spectra and electrochemical performance of the APC-750 and APC-750; detail information of control samples. See DOI: 10.1039/c6ra22426a</atitle><date>2016-10-25</date><risdate>2016</risdate><volume>6</volume><issue>13</issue><spage>11372</spage><epage>11379</epage><pages>11372-11379</pages><eissn>2046-2069</eissn><abstract>Hemp stem, a biomass waste, has been successfully explored as a green carbon source to prepare advanced N-doped hierarchical porous carbon by means of KOH pre-treatment and direct pyrolysis under NH
3
flow. The NH
3
flow can not only promote the activation of carbon but also bring nitrogen into the carbon framework. The simultaneous-activation of KOH and NH
3
can enhance the specific surface area, nitrogen content and electrical conductivity, significantly affecting the electrochemical performance for supercapacitors. The as-prepared sample with a high specific surface area (1949 m
2
g
−1
), high nitrogen content (4.4 wt%), hierarchical porosity and high electrical conductivity (3.5 S cm
−1
), exhibits remarkable electrochemical performance as a supercapacitor electrode material, such as a high specific capacitance of 352 F g
−1
, outstanding rate capability and excellent cycling stability (96.3% retention after 10 000 cycles at 5 A g
−1
) in 6 M KOH electrolyte. In addition, the as-assembled symmetric supercapacitor delivers an ultrahigh energy density of 99.5 W h kg
−1
in an ionic liquid system. Moreover, a value of 27.7 W h kg
−1
is still maintained even at a high power density of 22 000 W kg
−1
. More interestingly, the supercapacitor can light up a red light-emitting-diode for more than 8 minutes after being charged for only 4.4 seconds.
Hemp stem simultaneously-activated by KOH and NH
3
for high performance supercapacitors.</abstract><doi>10.1039/c6ra22426a</doi><tpages>8</tpages></addata></record> |
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source | Royal Society Of Chemistry Journals 2008- |
title | N-Doped hierarchical porous carbon prepared by simultaneous-activation of KOH and NH3 for high performance supercapacitorsElectronic supplementary information (ESI) available: Schematic illustration of preparation of AKPC-750; XPS spectra and electrochemical performance of the APC-750 and APC-750; detail information of control samples. See DOI: 10.1039/c6ra22426a |
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