PAMPS/MMT composite hydrogel electrolyte for solid-state supercapacitors

Abstract

PAMPS/MMT composite electrolytes with high ionic conductivities were prepared by solution-casting method. The influences of Na-MMT contents on the ionic conductivities and mechanical properties of PAMPS hydrogel electrolyte were characterized and the electrochemical properties of supercapacitor with PAMPS/MMT composite electrolytes were investigated. The addition of Na-MMT can increase the ionic conductivities, tensile strength of PAMPS. PAMPS/MMT composite electrolyte has the superior integrated performance of ionic conductivities and tensile strength when the mass fraction of Na-MMT is about 5~7%, the ionic conductivity is 5.91×10 -2 S cm -1 and the tensile strength is 8.9 MPa. The capacitor exhibits ideal behavior for the electronic double-layer capacitance. The specific capacitance and the cycling stability of PAMPS/MMT composite electrolytes are enhanced in comparison with that of PAMPS. Thus it provides a promising composite polyelectrolyte for supercapacitor.

Hybrid Solid Polymer Electrolytes with Two‐Dimensional Inorganic Nanofillers

“…Electrospinning is an alternative route to prepare solid polymer electrolyte materials, wherein Solarajan and colleagues [77] designed electrospun PVDF-HFP/MMT mats as solid electrolytes in Li-ion capacitors (Figure 10 C). The breakdown voltage was extended from 2.4 to 3.1 Vupon addition of [78] explored the use of ah ydrogel electrolyte consistingo f acrylamido-2-methyl-1-propanesulfonic acid (AMPS) polymerised in the presence of Na-MMT.N op seudocapacitive characteristic was seen in the prepared nanocomposite signifying pure ion conduction,a nd owing to the synergistic effects of both clay and polymer towards ionm ovement, ac alculated specific capacitance of 22 Fg À1 and 90 %r etention after 1000 cycles wereachieved (Figure 10 D). The breakdown voltage was extended from 2.4 to 3.1 Vupon addition of [78] explored the use of ah ydrogel electrolyte consistingo f acrylamido-2-methyl-1-propanesulfonic acid (AMPS) polymerised in the presence of Na-MMT.N op seudocapacitive characteristic was seen in the prepared nanocomposite signifying pure ion conduction,a nd owing to the synergistic effects of both clay and polymer towards ionm ovement, ac alculated specific capacitance of 22 Fg À1 and 90 %r etention after 1000 cycles wereachieved (Figure 10 D).…”

“…The breakdown voltage was extended from 2.4 to 3.1 Vupon addition of MMT and the capacitor was able to retain 90 %o fi ts specific capacitance (134.9 Fg À1 )a fter 2000 cycles (Figure 10 C). Wang et al [78] explored the use of ah ydrogel electrolyte consistingo f acrylamido-2-methyl-1-propanesulfonic acid (AMPS) polymerised in the presence of Na-MMT.N op seudocapacitive characteristic was seen in the prepared nanocomposite signifying pure ion conduction,a nd owing to the synergistic effects of both clay and polymer towards ionm ovement, ac alculated specific capacitance of 22 Fg À1 and 90 %r etention after 1000 cycles wereachieved (Figure 10 D).…”

“…The breakdown voltage was extended from 2.4 to 3.1 V upon addition of MMT and the capacitor was able to retain 90 % of its specific capacitance (134.9 F g −1 ) after 2000 cycles (Figure C). Wang et al . explored the use of a hydrogel electrolyte consisting of acrylamido‐2‐methyl‐1‐propanesulfonic acid (AMPS) polymerised in the presence of Na‐MMT.…”

Redox‐Mediated Poly(2‐acrylamido‐2‐methyl‐1‐propanesulfonic acid)/Ammonium Molybdate Hydrogels for Highly Effective Flexible Supercapacitors

“…The mixture of the electrolyte including 0.1 M K 3 Fe (CN) 6 + 1 M KOH and 0.1 M K4Fe(CN) 6 + 1 M KOH increased the capacitance values to 712 and 317 F g À 1 respectively, which is better than using 1 M KOH solution (226 F g À 1 ). [16] Another cross-linked PAMPS / PVA / MMT hydrogel was prepared by Wang et al, where the inorganic additive was used for better ionic conductivity and the maximum specific capacitance in this case reached to 208 F g À 1 . The capacitance value was increased from 472 F g À 1 (in 1 M H 2 SO 4 ) to 912 F g À 1 (in KI added 1 M H 2 SO 4 ).…”

“…[15] Recently, cross-linked PAMPS/MMT hydrogels were synthesized and used for electrochemical measurements along with KOH as an inorganic additive. [16] Another cross-linked PAMPS / PVA / MMT hydrogel was prepared by Wang et al, where the inorganic additive was used for better ionic conductivity and the maximum specific capacitance in this case reached to 208 F g À 1 . [17] The application of redox mediated PAMPS polyelectrolyte systems for supercapacitors may have interesting results, and to the best of our knowledge, this system has not been previously reported.…”