Manganese oxide electrochemical capacitor with potassium poly(acrylate) hydrogel electrolyte

A facile prestrain-stick-release assembly of stretchable supercapacitors based on highly stretchable and sticky hydrogel electrolyte

“…However, traditional polymer hydrogels are mechanically weak, such as poly(acrylamide) (PAAM) [40], poly(ether ether ketone) (PEEK) [41], potassium polyacrylate (PAAK) [42] and so on. In this manuscript, to enhance the mechanical performance of PAAM, HEMA end-capped aPUA was introduced as a multifunctional crosslinking agent for the polymerization of AAM.…”

High-performance all-solid-state flexible supercapacitors based on manganese dioxide/carbon fibers

“…A single MnO 2 /CFs fiber electrode exhibits a specific volumetric capacitance of 58.7 F cm -3 at 0.1 A g -1 with a specific gravimetric capacitance of 428 F g -1 based on the MnO 2 mass. Two hybrid carbon fiber electrodes were assembled together in parallel with polyvinyl pyrrolidone (PVP)/Na 2 SO 4 gel, which is used as both an electrolyte and a separator [27][28][29][30][31][32][33][34][35][36]. The all-solid-state device displays a high volumetric energy density of 3.8 mWh cm -3 at power density of 89 mW cm -3 with a good flexibility (CV curves almost unchanged after 1000 bending times) and a superior long cycle stability (an 85.8% capacitance retention after 10000 cycles).…”

Long-term electrochemical behaviors of manganese oxide aqueous electrochemical capacitor under reducing potentials

“…Amorphous MnO 2 has been intensively studied as a supercapacitors electrode material. It possesses the advantages of, for instance, low cost, sufficiently high specific capacitance, and environmentally friendly nature [2][3][4][5][6][7][8][9][10][11][12].…”