Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 30, Issue 51, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202006561
Keywords
anode; energy storage; metal-organic frameworks; porous carbon; potassium-ion capacitors
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Funding
- National Natural Science Foundation of China [51902188, 21603125]
- Natural Science Foundation of Jiangsu Province [BK20190207]
- CAS Key Laboratory of Carbon Materials [KLCMKFJJ2006]
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Potassium ion capacitors (PIC) have been extensively explored as an economically favorable substitute for their well-developed lithium ion counterparts. However, their commercialization suffers from their low energy density and relatively short cycling life. Here, a porous carbon microsheets anode is produced by morphology-preserved thermal transformation of sheet-like manganese-based metal-organic frameworks. The as-produced porous carbon microsheets anode has a disordered, interlayer-expanded, oxygen-doped structure, which is demonstrated to have excellent K(+)storage properties in terms of specific capacity, rate capability, and cycling stability. A PIC fabricated by employing Mn-MOF derived porous carbon (MDPC) as the anode and activated carbon as the cathode, yields an energy density of up to 120 Wh kg(-1)and a maximum power density of 26 kW kg(-1)as well as a long-term cycling life over 120 000 cycles, which is close to those of most Li-ion counterparts. These promising results demonstrate that exploring novel carbon anodes can promote the rapid development of PICs toward practical applications.
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