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Necklace‐like Nitrogen‐Doped Tubular Carbon 3D Frameworks for Electrochemical Energy Storage
Author(s) -
Yuksel Recep,
Buyukcakir Onur,
Panda Pritam Kumar,
Lee Sun Hwa,
Jiang Yi,
Singh Deobrat,
Hansen Sandra,
Adelung Rainer,
Mishra Yogendra Kumar,
Ahuja Rajeev,
Ruoff Rodney S.
Publication year - 2020
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201909725
Subject(s) - materials science , supercapacitor , microporous material , electrochemistry , carbon fibers , capacitance , specific surface area , porosity , nanotechnology , chemical engineering , nitrogen , doping , electrode , optoelectronics , composite material , composite number , biochemistry , chemistry , physics , quantum mechanics , engineering , catalysis
The design and synthesis of a necklace‐like nitrogen‐doped tubular carbon (NTC) are presented by growing microporous polyhedral ZIF‐8 particles and a uniform layer of ZIF‐8 on sacrificial ZnO tetrapods (ZTPs). Oxygen vacancies together with defect regions on the surface of the ZTPs result in the formation of ZIF‐8 polyhedra in conjunction with a very thin shell. This necklace‐like NTC structure has a high N content, very large surface area, ultrahigh microporosity, and quite high electrical conductivity. NTC‐based symmetrical supercapacitor and zinc‐ion capacitor (ZIC) devices are fabricated and their electrochemical performance is measured. The NTC supercapacitor shows an ultrahigh rate capability (up to 2000 mV s −1 ) and promising cycle life, retaining 91.5% of its initial performance after 50 000 galvanostatic charge–discharge cycles. An aqueous ZIC, constructed using the NTC, has a specific capacitance of 341.2 F g −1 at a current density of 0.1 A g −1 and an energy density of 189.6 Wh kg −1 with a 2.0‐V voltage window, respectively. The outstanding performance is attributed to the NTC high N‐doping content, a continuous “polyhedral 3D hollow” architecture and the highly porous microtubular arms exhibiting very high surface area.