TY - JOUR
T1 - Porous, one-dimensional and high aspect ratio nanofibric network of cobalt manganese oxide as a high performance material for aqueous and solid-state supercapacitor (2 V)
AU - Bhagwan, Jai
AU - Sivasankaran, V.
AU - Yadav, K. L.
AU - Sharma, Yogesh
N1 - Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2016/9/30
Y1 - 2016/9/30
N2 - Porous nanofibric network of spinel CoMn2O4 (CMO) are fabricated by facile electrospinning process and characterized by XRD, BET, TGA, FTIR, FESEM, TEM, XPS techniques. CMO nanofibers are employed as supercapacitor electrode for first time which exhibits high specific capacitance (Cs) of 320(±5) F g−1 and 270(±5) F g−1 at 1 A g−1 and 5 A g−1, respectively in 1 M H2SO4. CMO nanofibers exhibit excellent cyclability (till 10,000 cycles @ 5 A g−1). To examine practical performance, solid-state symmetric supercapacitor (SSSC) is also fabricated using PVA-H2SO4 as gel electrolyte. The SSSC evinces high energy density of 75 W h kg−1 (comparable to Pb-acid and Ni-MH battery) along with high power density of 2 kW kg−1. Furthermore, a red colored LED (1.8 V @ current 20 mA) was lit for 5 min using single SSSC device supporting its output voltage of 2 V. This high performance of CMO in both aqueous and SSSC is attributed to one dimensional nanofibers consisting of voids/gaps with minimum inter-particle resistance that facilitates smoother transportation of electrons/ions. These voids/gaps in CMO (structural as well as morphological) act as intercalation/de-intercalation sites for extra storage performance, and also works as buffering space to accommodate stress/strain produced while long term cyclings.
AB - Porous nanofibric network of spinel CoMn2O4 (CMO) are fabricated by facile electrospinning process and characterized by XRD, BET, TGA, FTIR, FESEM, TEM, XPS techniques. CMO nanofibers are employed as supercapacitor electrode for first time which exhibits high specific capacitance (Cs) of 320(±5) F g−1 and 270(±5) F g−1 at 1 A g−1 and 5 A g−1, respectively in 1 M H2SO4. CMO nanofibers exhibit excellent cyclability (till 10,000 cycles @ 5 A g−1). To examine practical performance, solid-state symmetric supercapacitor (SSSC) is also fabricated using PVA-H2SO4 as gel electrolyte. The SSSC evinces high energy density of 75 W h kg−1 (comparable to Pb-acid and Ni-MH battery) along with high power density of 2 kW kg−1. Furthermore, a red colored LED (1.8 V @ current 20 mA) was lit for 5 min using single SSSC device supporting its output voltage of 2 V. This high performance of CMO in both aqueous and SSSC is attributed to one dimensional nanofibers consisting of voids/gaps with minimum inter-particle resistance that facilitates smoother transportation of electrons/ions. These voids/gaps in CMO (structural as well as morphological) act as intercalation/de-intercalation sites for extra storage performance, and also works as buffering space to accommodate stress/strain produced while long term cyclings.
KW - CoMnO
KW - Electrospinning
KW - High energy/ power density
KW - Nanofibers
KW - Solid-state symmetric supercapacitor
UR - http://www.scopus.com/inward/record.url?scp=84978386159&partnerID=8YFLogxK
U2 - 10.1016/j.jpowsour.2016.07.040
DO - 10.1016/j.jpowsour.2016.07.040
M3 - Article
AN - SCOPUS:84978386159
SN - 0378-7753
VL - 327
SP - 29
EP - 37
JO - Journal of Power Sources
JF - Journal of Power Sources
ER -