TY - JOUR
T1 - Copper oxide stabilized oxy-functionalized boron nitride‑carbon nanotube nanohybrid
T2 - An ultra-stable electrode for flexible asymmetric supercapacitor device in ionic electrolyte
AU - Maity, Chandan Kumar
AU - De, Shrabani
AU - Acharya, Sourav
AU - Siddiki, Salim Hassan
AU - Sahoo, Sumanta
AU - Verma, Kartikey
AU - Thakur, Vijay Kumar
AU - Nayak, Ganesh Chandra
N1 - Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/12/1
Y1 - 2022/12/1
N2 - This work explores the smart combination of functionalized boron nitride (mK-BN) and carbon nanotube (CNT), stabilized with copper oxide (CuO), as a highly stable, flexible supercapacitor electrode in low-cost viable ionic electrolyte. Oxy-surface modified boron nitride (BN) was introduced to induce supplementary acceptor and donor energy levels for charge transport. Incorporation of CNT facilitated the charge storage through EDLC mechanism and also reduced internal resistance. In three-electrode analysis, CuO/mK-BN/CNT nanohybrid exhibited specific capacitance (Csp) of 425 F/g in aqueous KCl. An asymmetric supercapacitor (ASC) device using CuO/mK-BN/CNT as cathode achieved a Csp of 80 F/g and 36 Wh/kg energy density with ⁓88 % stability after 25,000 charging-discharging cycles in organic electrolyte. To further boost the capacitive performance, energy density, and rate capability of the ASC device, a low-cost, solvent free, and viable ionic electrolyte [(NEt3H)+(HSO4)−] was introduced. In ionic electrolyte, device showed a maximum Csp of 132 F/g with an enhanced energy density of 59.4 W h/kg. ASC devices in ionic electrolyte also exhibited superior volumetric energy density of 1.410 mW h/cm3 and excellent electrochemical performances after connecting two cells in parallel or in series combination implying the capability of the device to produce different required capacitance and potential for practical application. Finally, a flexible ASC device with the ionic electrolyte was also tested. This work established that with the smart combination of additional energy level induced functionalized BN, conducting nanotubes, and pseudocapacitive CuO, a highly stable, flexible asymmetric supercapacitor device can be fabricated with high energy density.
AB - This work explores the smart combination of functionalized boron nitride (mK-BN) and carbon nanotube (CNT), stabilized with copper oxide (CuO), as a highly stable, flexible supercapacitor electrode in low-cost viable ionic electrolyte. Oxy-surface modified boron nitride (BN) was introduced to induce supplementary acceptor and donor energy levels for charge transport. Incorporation of CNT facilitated the charge storage through EDLC mechanism and also reduced internal resistance. In three-electrode analysis, CuO/mK-BN/CNT nanohybrid exhibited specific capacitance (Csp) of 425 F/g in aqueous KCl. An asymmetric supercapacitor (ASC) device using CuO/mK-BN/CNT as cathode achieved a Csp of 80 F/g and 36 Wh/kg energy density with ⁓88 % stability after 25,000 charging-discharging cycles in organic electrolyte. To further boost the capacitive performance, energy density, and rate capability of the ASC device, a low-cost, solvent free, and viable ionic electrolyte [(NEt3H)+(HSO4)−] was introduced. In ionic electrolyte, device showed a maximum Csp of 132 F/g with an enhanced energy density of 59.4 W h/kg. ASC devices in ionic electrolyte also exhibited superior volumetric energy density of 1.410 mW h/cm3 and excellent electrochemical performances after connecting two cells in parallel or in series combination implying the capability of the device to produce different required capacitance and potential for practical application. Finally, a flexible ASC device with the ionic electrolyte was also tested. This work established that with the smart combination of additional energy level induced functionalized BN, conducting nanotubes, and pseudocapacitive CuO, a highly stable, flexible asymmetric supercapacitor device can be fabricated with high energy density.
KW - Asymmetric supercapacitor
KW - Flexible
KW - Functionalized boron nitride
KW - Ionic electrolyte
KW - Volumetric energy density
UR - http://www.scopus.com/inward/record.url?scp=85141282849&partnerID=8YFLogxK
U2 - 10.1016/j.est.2022.105928
DO - 10.1016/j.est.2022.105928
M3 - Article
AN - SCOPUS:85141282849
SN - 2352-152X
VL - 56
JO - Journal of Energy Storage
JF - Journal of Energy Storage
M1 - 105928
ER -