The accumulation of solid polymer wastes stifles society's sustainable growth. Herein, N-, S-codoped polystyrene (thermocol) waste-derived carbon is synthesized using a simple approach and utilized as an electrode for a lithiumsulfur battery and supercapacitor applications. The aqueous symmetric supercapacitor delivers a high specific energy of 60 and 27 Wh kg À1 at a specific power of 75 and 3780 W kg À1 , respectively and 150 Wh kg À1 at a specific power of 520 W kg À1 in nonaqueous sodium-ion capacitors with high cycling stability. Deconvolution by Dunn's and Trasatti's approaches reveals an enhanced capacitive-charge storage rather than diffusive-charge storage due to heteroatom doping and mesopores of the generated carbon. The lithium-sulfur battery delivers a stable capacity of 1079 mAh g À1 at 0.1C rate with excellent cycling stability over 500 cycles, suggesting improved mitigation of polysulfide dissolution imparted by the mesoporous carbon with thiophene moiety which effectively traps Li 2 S n .

Nanostructured perovskite oxide, LaMnO3 was successfully synthesized by a one-step surfactant-assisted hydrothermal method. The as-prepared perovskite has been characterized by various material characterization techniques. The characterizations revealed that the LaMnO3...

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