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Sulfonated Hollow Silica Spheres as Electrolyte Store/Release Agents: High‐Performance Supercapacitor Applications
Author(s) -
Cevik Emre,
Gunday Seyda Tugba,
Akhtar Sultan,
Yamani Zain H.,
Bozkurt Ayhan
Publication year - 2019
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201900511
Subject(s) - supercapacitor , materials science , electrolyte , vinyl alcohol , chemical engineering , capacitance , polymer , nanocomposite , nanoparticle , energy storage , electrode , nanotechnology , composite material , chemistry , power (physics) , physics , quantum mechanics , engineering
Sulfonated hollow silica spheres (HSS‐S) are synthesized and applied in supercapacitors as acid‐filling and acid‐releasing agents in a polymer matrix, thanks to their unique architecture wherein the hollow spheres can be filled with acid (HSS‐S‐F) and can be dispersed in poly(vinyl alcohol) (PVA) with various weight fractions to produce nanocomposite gel polymer electrolytes (GPEs), HSS‐S/PVA, and HSS‐S‐F/PVA. The symmetrical supercapacitor device is assembled using an active carbon(AC) electrode and the GPE HSS‐S‐F/PVA shows a specific capacitance value of 147 F g −1 at 0.5 A g −1 . Alternatively, the GPE HSS‐S/PVA shows a specific capacitance of 52 F g −1 at the same current density. The symmetrical supercapacitor based on HSS‐S‐F/PVA has a high‐energy density of 20.40 W·h kg −1 at a power density of 545 W kg −1 with a remarkable cyclic stability with a loss of only 15% after 2250 charge–discharge cycles. This excellent property demonstrates that HSS‐S is a promising additive and has the potential to produce more efficient energy storage devices by changing the hollow particle size, pore size, and using different host polymer electrolytes.