Nanosheet-assembled NiO microstructures have been synthesized via a hydrothermal method. The presence of anionic surfactant in the fabrication process initiates the formation of lamellar micelles and a self-assembling process. This leads to the formation of NiO nanosheets and organizes it into microstructures. The effect of preparation temperature on the morphological, structural, and electrochemical properties and stability upon continuous charge/discharge cycles has been examined for supercapacitor applications. Electrochemical analysis demonstrated that NiO nanosheets prepared at 160 °C are capable of delivering a specific capacitance of 989 F g(-1) at a scan rate of 3 mV s(-1) for the potential window of 0-0.6 V. The nanosheets exhibit excellent capacity retention, 97% retention after 1000 continuous charge/discharge cycles, and an energy density of 49.45 W h kg(-1).

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A facile and template free greener route is used to fabricate natural polysaccharide based biocompatible mesh-like Fe 2 O 3 /C nanocomposites for supercapacitor application. Thermal, structural and morphological properties of iron oxide-carbon composites prepared at different annealing temperature have been analyzed and the electrochemical properties of composites are evaluated. The nanocomposite prepared at 500 C with mesh-like structure reveals maximum specific capacitance of 315 F g À1 in 2 M KOH solution at a scan rate of 2 mV s À1 and good capacity retention (88.9%) after 1500 continues charge-discharge cycles with energy density of 37 W h kg À1 , indicating that the Fe 2 O 3 /C composite can be a promising electroactive material for a supercapacitor.

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