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A Gas‐Steamed MOF Route to P‐Doped Open Carbon Cages with Enhanced Zn‐Ion Energy Storage Capability and Ultrastability
Author(s) -
Hou ChunChao,
Wang Yu,
Zou Lianli,
Wang Miao,
Liu Hongwen,
Liu Zheng,
Wang HaoFan,
Li Caixia,
Xu Qiang
Publication year - 2021
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202101698
Subject(s) - materials science , carbon fibers , dopant , nanocages , chemical engineering , supercapacitor , nanotechnology , energy storage , electrochemistry , power density , doping , electrode , composite material , optoelectronics , catalysis , organic chemistry , composite number , chemistry , engineering , power (physics) , physics , quantum mechanics
Carbon micro/nanocages have received great attention, especially in electrochemical energy‐storage systems. Herein, as a proof‐of‐concept, a solid‐state gas‐steamed metal–organic‐framework approach is designed to fabricate carbon cages with controlled openings on walls, and N, P dopants. Taking advantage of the fabricated carbon cages with large openings on their walls for enhanced kinetics of mass transport and N, P dopants within the carbon matrix for favoring chemical adsorption of Zn ions, when used as carbon cathodes for advanced aqueous Zn‐ion hybrid supercapacitors (ZHSCs), such open carbon cages (OCCs) display a wide operation voltage of 2.0 V and an enhanced capacity of 225 mAh g −1 at 0.1 A g −1 . Also, they exhibit an ultralong cycling lifespan of up to 300 000 cycles with 96.5% capacity retention. Particularly, such OCCs as electrode materials lead to a soft‐pack ZHSC device, delivering a high energy density of 97 Wh kg −1 and a superb power density of 6.5 kW kg −1 . Further, the device can operate in a wide temperature range from −25 to + 40 °C, covering the temperatures for practical applications in daily life.