posted on 2023-11-28, 09:04authored byPinky Saharan, Mandeep Singh, Chandan Kumar, Shashank Sundriyal, S. R. Dhakate
The
commercialization of pure carbon-based supercapacitors has
faced challenges due to their limited energy density. In order to
overcome this challenge, the construction of carbon materials with
a hierarchical pore structure has been proposed. Herein, we describe
a straightforward template-free method to develop highly nanoporous
activated carbon (ACs), via a one-step process where polyaniline (PANI)–polypyrrole
(PPy) copolymer is carbonized/activated with KOH in a single step
at temperatures ranging from 800 to 1000 °C in N2 environment
to get a highly nanoporous ACs. The AC-900 material comprises a network
of linked pores and a higher specific surface area of 3899.88 m2/g along with a high electrochemical surface area of 722.05
m2/g, allowing for large amounts of ion storage and quick
ion transit. AC-900 has exhibited a very favorable electrochemical
performance, in a 1 M H2SO4 electrolyte, a specific
capacitance of 1073.9 F/g was achieved when the current density was
set to 0.5 A/g. Symmetrical devices were fabricated out of two AC-900
electrodes of equivalent weight, and the results demonstrate that
the AC-900//AC-900 device at a power density of approximately 868
W/kg. The device reaches a noteworthy energy density of ∼72
W h/kg, while also demonstrating very high cyclic stability with an
efficiency of approximately 100% even after undergoing 6,000 charge–discharge
cycles. The impressive electrochemical performance displayed by AC-900
underscores its significant potential as a polymer-derived carbon
nanomaterial for electrodes in supercapacitor applications.