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From basil seed to flexible supercapacitors: Green synthesis of heteroatom‐enriched porous carbon by self‐gelation strategy
Author(s) -
Yang Hanwen,
Zhou Jie,
Wang Mengqi,
Wu Shengji,
Yang Wei,
Wang Hui
Publication year - 2020
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.5222
Subject(s) - supercapacitor , heteroatom , capacitance , materials science , electrochemistry , chemical engineering , porosity , carbon fibers , power density , electrode , specific surface area , nanotechnology , composite material , chemistry , organic chemistry , catalysis , power (physics) , ring (chemistry) , composite number , engineering , physics , quantum mechanics
Summary Basil seed‐derived multi‐heteroatom–doped porous carbons (BHPCs) are successfully synthesized by a facile gelation, followed by a moderate gel water/KOH coactivation process. The BHPC‐700 prepared at a relatively low KOH loading and activation temperature possesses large specific surface area (1178.3 m 2 g −1 ), well‐defined hierarchical micro/meso porosity, and rich self‐doping heteroatom functionalities (13.08 at% of oxygen, nitrogen, phosphorous, and sulfur). Electrochemical tests demonstrate that the BHPC‐700–based electrode achieves an ultrahigh specific capacitance (464 F g −1 at 0.5 A g −1 ), outstanding rate performance (retaining 73.3% capacitance at 50 A g −1 ), and superior cyclic stability (96.8% capacitance retention over 5000 cycles). Furthermore, the BHPC‐700 electrodes are assembled into all‐solid‐state symmetrical supercapacitors. The as‐assembled device gives a high energy density of 15.0 Wh kg −1 at a power density of 500 W kg −1 and remarkable flexibility, demonstrating great application prospects in the area of sustainable portable electronics.