Bimetallic
metal–organic frameworks (MOFs) with an ultrathin
configuration are compelling materials for developing high-performance
energy storage devices on account of their unique structural merits.
Herein, a hydrangea-like NiCo-MOF is well prepared using controllable
solvothermal and cation-exchange processes, synchronously achieving
bimetallic nodes and hierarchical ultrathin architecture. The structural
superiority enables NiCo-MOF of expanded electrons’ transfer
pathways and multitudinous electrolytes’ diffusion channels,
resulting in a significant enhancement in pseudocapacitive performance.
Coupling with the bimetallic nature and constructional advantages,
NiCo-MOF shows superior gravimetric capacity (832.6 C g–1 at 1 A g–1) and electrochemical kinetics to those
of monometallic Ni-MOF and Co-MOF. Importantly, the quasi-solid-state
hybrid supercapacitor (HSC) based on the NiCo-MOF cathode and active
carbon (AC) anode delivers a desirable energy density (45.3 Wh kg–1 at 847.8 W kg–1), a favorable power
density (7160.0 W kg–1 at 23.3 Wh kg–1), a remarkable cyclability (82.4% capacity retention over 7000 cycles),
and a capability of driving miniature electronics, exhibiting its
potential in practical applications. This work presents an efficient
design strategy to develop kinetics-favorable MOF materials for energy
storage.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.