The periodic layered structure due to the well-arranged
sheets
and the presence of surface terminations (-OH, -O, and -F) on those
sheets makes MXene an attractive aspirant for supercapacitor devices.
Though MXene exhibits interesting redox behavior, the collapse of
its layered structure and irreversible stacking of sheets retard its
redox reaction and restrict the ion transport process. To enhance
its electrochemical performance, we have developed a nanocomposite
where the α-Ni(OH)2 petals are slid within the MXene
structure as well as anchored on its surface. The multivalent character
of Ni in Ni(OH)2 enhances the redox performance of the
nanocomposite. Fabrication of a high-performance flexible all-solid-state
asymmetric supercapacitor (ASC) device has been carried out using
this 50MXene-50Ni(OH)2 nanocomposite as the cathode and
the biomass-derived porous carbon as the anode. This ASC device manifested
a high energy density of 29.3 W h kg–1 at a power
density of 800 W kg–1 and 90% retention of specific
capacitance (C
S) even after ∼5000
GCD cycles. This supercapacitor device also demonstrated its mechanically
flexible feature by showing its consistent electrochemical performance
in diverse physical deformations. This flexible device illustrated
its competence in real-world applications by illuminating an assembly
of LED lights.
The rising demand for portable and wearable electronics, biomedical implants, healthcare gadgets, etc., in the global market is triggering the augmentation of flexible supercapacitor devices that can supply sustainable but...
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