TY - JOUR
T1 - High-performance quasi-solid-state asymmetric supercapacitors based on BiMn2O5 nanoparticles and redox-additive electrolytes
AU - Bhagwan, Jai
AU - Ramulu, Bhimanaboina
AU - Yu, Jae Su
N1 - Publisher Copyright:
© 2019 the Partner Organisations.
PY - 2019/8
Y1 - 2019/8
N2 - The investigation of nanomaterials with improved energy storage performance is essential in the development of high energy density supercapacitors. Herein, bismuth manganese oxide (BiMn2O5, BMO) nanoparticles were facilely synthesized by a combustion method and used as an electrode material in aqueous and quasi-solid-state asymmetric supercapacitors (ASCs). In a three-electrode system, the BMO electrode exhibited a specific capacitance of 228 F g-1 at a current density of 2 A g-1 in 1 M H2SO4 electrolyte. Furthermore, to enhance the performance of the electrode material, the bare electrolyte was modified by redox-additive potassium iodide (KI), and then an improved specific capacitance of 405 F g-1 at 2 A g-1 was obtained. Moreover, the ASC device was fabricated using a gel electrolyte (PVA:H2SO4 = 1:1) with a small amount of redox-additive KI, which demonstrated the maximum specific capacitance of 206 F g-1 at 1 A g-1. The energy and power densities of the device were found to be 114 W h kg-1 and 0.99 kW kg-1, respectively, at 1 A g-1. The almost stable specific capacitance of the device was obtained until 2500 cycles, indicating the excellent durability of the ASC. To check the viability of the device, twelve parallel connected red color light-emitting diodes were successfully operated with two series connected ASCs, suggesting its good energy storage performance. Furthermore, an electric motor fan was also powered by ASCs. The BMO nanoparticles and redox-additive electrolytes are expected to be economically favorable strategies to enable the high energy storage performance of supercapacitor devices.
AB - The investigation of nanomaterials with improved energy storage performance is essential in the development of high energy density supercapacitors. Herein, bismuth manganese oxide (BiMn2O5, BMO) nanoparticles were facilely synthesized by a combustion method and used as an electrode material in aqueous and quasi-solid-state asymmetric supercapacitors (ASCs). In a three-electrode system, the BMO electrode exhibited a specific capacitance of 228 F g-1 at a current density of 2 A g-1 in 1 M H2SO4 electrolyte. Furthermore, to enhance the performance of the electrode material, the bare electrolyte was modified by redox-additive potassium iodide (KI), and then an improved specific capacitance of 405 F g-1 at 2 A g-1 was obtained. Moreover, the ASC device was fabricated using a gel electrolyte (PVA:H2SO4 = 1:1) with a small amount of redox-additive KI, which demonstrated the maximum specific capacitance of 206 F g-1 at 1 A g-1. The energy and power densities of the device were found to be 114 W h kg-1 and 0.99 kW kg-1, respectively, at 1 A g-1. The almost stable specific capacitance of the device was obtained until 2500 cycles, indicating the excellent durability of the ASC. To check the viability of the device, twelve parallel connected red color light-emitting diodes were successfully operated with two series connected ASCs, suggesting its good energy storage performance. Furthermore, an electric motor fan was also powered by ASCs. The BMO nanoparticles and redox-additive electrolytes are expected to be economically favorable strategies to enable the high energy storage performance of supercapacitor devices.
UR - http://www.scopus.com/inward/record.url?scp=85070468122&partnerID=8YFLogxK
U2 - 10.1039/c9qi00613c
DO - 10.1039/c9qi00613c
M3 - Article
AN - SCOPUS:85070468122
SN - 2052-1545
VL - 6
SP - 2061
EP - 2070
JO - Inorganic Chemistry Frontiers
JF - Inorganic Chemistry Frontiers
IS - 8
ER -