Lamellar K2Co3(P2O7)2·2H2O nanocrystal whiskers: High-performance flexible all-solid-state asymmetric micro-supercapacitors via inkjet printing

Abstract A flexible all-solid-state asymmetric micro-supercapacitor based on lamellar (K 2 Co 3 (P 2 O 7 ) 2 ·2H 2 O) nanocrystal whiskers and graphene nanosheets was successfully fabricated by inkjet printing in a simple and cost-effective way. A facile method to synthesize lamellar K 2 Co 3 (P 2 O 7 ) 2 ·2H 2 O nanocrystal whiskers under a mild hydrothermal condition was also established. The assembled micro-device exhibited a high specific capacitance (6.0 F cm −3 ), good rate/mechanical stability and a long cycling stability (5000 cycles) with a maximun energy density of 0.96 mW h cm −3 , demonstrating great promise for applications in flexible all-solid-state micro-supercapacitors.

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