Abstract
Echinus-like nitrogen-doped carbon with a hierarchical porous structure was synthesized from green larch waste and urea via liquid in situ doping and high-temperature carbonization. Benefitting from a large specific surface area (649 m2 g−1) and hierarchical porous structure, the nitrogen-doped carbon exhibited excellent electrochemical performance for supercapacitors. Remarkably, the echinus-like nitrogen-doped carbon achieved a high specific capacitance of 340 F g−1 at a current density of 1 A g−1 in 6 M KOH electrolyte as well as a good performance rate and stability (with a capacitance retention of 98% after 5000 cycles). This capacitance was almost 1.5 times higher than that of undoped carbon due to the contribution of the pseudocapacitance from the nitrogen doping. Larch sawdust is a promising carbon source for fabricating inexpensive, sustainable and high-performance supercapacitor materials.
Funding source: National Natural Science Foundation of China
Award Identifier / Grant number: 31800499
Award Identifier / Grant number: 31600472
Award Identifier / Grant number: 31570566
Funding source: Natural Science Foundation of Shandong Province
Award Identifier / Grant number: ZR2017LEM009
Award Identifier / Grant number: ZR2016YL007
Funding source: Shandong Academy of Sciences
Award Identifier / Grant number: 2017BSH2010
Funding source: Key Research and Development Program of Shandong Province
Award Identifier / Grant number: 2017GSF17130
Award Identifier / Grant number: KF201813-4
Award Identifier / Grant number: KF201717
Funding source: Key Laboratory of Pulp and Paper Science and Technology of the Ministry of Education/Shandong Province of China
Award Identifier / Grant number: ZR201707
Award Identifier / Grant number: ZR201710
Funding statement: The present work was financially supported by the National Natural Science Foundation of China (grant nos. 31800499, 31600472, 31570566), the Natural Science Foundation of Shandong Province, Funder Id: http://dx.doi.org/10.13039/501100007129 (ZR2017LEM009, ZR2016YL007), the Joint Research Fund for young doctor of Qilu University of Technology (Shandong Academy of Sciences) (no. 2017BSH2010), the Key Research and Development Program of Shandong Province (no. 2017GSF17130), the Foundation of Guangxi Key Laboratory of Clean Pulp and Papermaking and Pollution Control of China (KF201813-4, KF201717), and the Foundation of Key Laboratory of Pulp and Paper Science and Technology of the Ministry of Education/Shandong Province of China (nos. ZR201707, ZR201710).
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: None declared.
Employment or leadership: None declared.
Honorarium: None declared.
Conflict of interest statement: The authors declare no conflict of interests.
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