Successive ionic layer adsorption and reaction (SILAR)-based room-temperature (27 °C) chemical synthesis of bismuth oxide (Bi2O3) and its ionic conversion to bismuth sulphide (Bi2S3) has been performed and reported in the present study. A chemical conversion of the bismuth oxide to the bismuth sulphide has been confirmed using changes in the structure, phase, surface elementals , and surface area measurement studies. Both bismuth oxide and bismuth sulphide electrode materials are envisaged in electrochemical measurements wherein, the later has evidenced an enhanced electrochemical performance over the prior. The cycling stability of the Bi2S3 (91% after 2000 cycles) electrode material is also better than the Bi2O3 (87% over 2000 cycles). The as-assembled Bi2S3//Bi2S3 symmetric electrochemical supercapacitor device has adduced 75.3 Wh kg−1 and 749.8 W Kg−1energy and power densities, respectively with nearly 88.8% capacitance retention efficacy even over 2000 redox cycles measured at 10 A g−1. The commercial potential of the Bi2S3//Bi2S3 has been tested by powering the display panel “CNED” consisting nearly 42 LEDs with a full-light intensity.
Most
of the electrode materials used in energy-storage devices
are either framed or deposited onto a conductive substrate. In the
present work, the stretchable, foldable, and flexible commercial sponge,
envisaged for cleaning in daily life, has been converted to a conducting
material with the help of polypyrrole (PPy). The bismuth oxide (Bi2O3) electrode material of wool ball-like morphology
is synthesized over pre-deposited PPy as a hybrid Bi2O3@PPy electrode using successive ionic layer adsorption and
reaction method. Due to the special wool ball-like morphology of Bi2O3 and the porous structure of the PPy@sponge,
more active sites with the shortest diffusion pathways for easy and
fast electron-ion transportation are dominant. At a current density
of 2 A g–1, the hybrid Bi2O3@PPy electrochemical supercapacitor (SC) exhibits a specific capacitance
of 471.2 F g–1, and, even at a high current density
of 10 A g–1, nearly 88% of the original capacitance
has been retained over 5 K redox cycles. A pencil-type asymmetric
supercapacitor designed using Bi2O3@PPy//graphite
rod electrodes has delivered energy densities of 12 Wh kg–1 and 1363.6 W kg–1 of power density by consuming
a 1.2 V voltage window in 3.0 M KOH aqueous electrolyte solution,
and an excellent 70% cycling stability at a higher current density
of 10 A g–1 is maintained. Two asymmetric supercapacitor
devices connected in series can shine a red light-emitting diode with
full brightness for 2 min, suggesting the energy storage efficacy
of Bi2O3@PPy on the nonconductive substrate.
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.