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Boron and Nitrogen Co‐Doped Trimodal‐Porous Wood‐Derived Carbon for Boosting Capacitive Performance
Author(s) -
Liu Kun,
Xu Jijian,
Wang Yuan,
Qian Meng,
Zhao Wei,
Zeng Yi,
Huang Fuqiang
Publication year - 2020
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201900950
Subject(s) - supercapacitor , heteroatom , materials science , pseudocapacitance , carbon fibers , carbonization , capacitance , chemical engineering , doping , porosity , electrolyte , boron , nanotechnology , electrode , composite material , organic chemistry , chemistry , optoelectronics , composite number , scanning electron microscope , ring (chemistry) , engineering
Heteroatom doping and a porous structure are two significant factors that improve the capacitance performance of carbon‐based electrodes, but there are often one‐sided considerations between them. Herein, effective B, N co‐doping and trimodal‐porous structure from the carbonization of sustainable natural wood are obtained at the same time. The unique pore structure is coarsely tuned by a modified ZnAc 2 ‐assisted hypersaline route and further fine‐tuned by controlling the doping levels of boron and nitrogen. The high specific surface area of porous carbon up to 1201 m 2 g −1 is coordinated with the trimodal foam‐like nanopores. This carbon‐based material as a supercapacitor electrode can provide not only trimodal‐porous ion transfer highways but also doping‐induced pseudocapacitance. The resulting pore and heteroatom reengineered wood‐derived carbon harvests a remarkable capacitance of 479 F g −1 at 1 A g −1 , among the highest values in reported B, N co‐doped carbon electrodes. The aqueous symmetric supercapacitor exhibits energy density of 18.5 Wh kg −1 and power density of 6.4 kW kg −1 , along with >90% capacitance retention, both in H 2 SO 4 and Li 2 SO 4 electrolyte over 10 000 cycles.