Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 7, Issue 15, Pages 9247-9252Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta01653h
Keywords
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Funding
- National Natural Science Foundation of China [21573265, 21673263, 21805291, 51501208]
- One-Three-Five Strategic Planning of Chinese Academy of Sciences
- DNL Cooperation Fund, CAS [DNL180307]
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Although potassium-ion storage technology has started to receive significant attention, its development is still in its infancy; thus, exploration of suitable electrode materials is critical at this stage. Herein, onion-like carbon (OLC) was obtained from the combustion soot as the candle burnt and used as a promising anode material for potassium-ion storage. This OLC delivered high reversible capacity and exhibited good rate performance and cycling stability. Taking advantage of these features, a potassium-ion hybrid capacitor (PIHC) with OLC as the battery-type anode and activated carbon as the capacitor-type cathode was constructed. The constructed device displayed the high energy density of 142W h kg(-1), the ultrahigh power output of 21 kW kg(-1), and a long cycling life (83% capacity retention after 6000 cycles). Thus, this device may simultaneously cater to the requirements of high power and high energy densities in a wide range of applications.
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