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Summary: In this study, we report a novel biomass‐derived porous carbon nanostructures (BD‐PCNSs) obtained from Lantana camara stem (LAC) using a simple and low‐cost preparation method. LAC biomass was processed with a temperature‐controlled hydrothermal precarbonization cum pyrolysis technique and followed by alkaline surface activation to achieve BD‐PCNSs. The physicochemical properties for the obtained BD‐PCNSs material were confirmed using X‐ray diffraction, scanning electron microscopy, nitrogen sorption isotherms, and X‐ray photoelectron spectroscopy. As‐prepared BD‐PCNSs exhibited excellent performances toward supercapacitance and wastewater treatment. BD‐PCNSs showed high‐specific capacitance ~146 Fg−1 in the aqueous electrolyte with excellent coulombic efficiency, and cyclic retention affirms its green energy storage device fabrication. Also, maximum adsorption capacity (106.4 mg g−1) was achieved for the efficient removal of ibuprofen from wastewater and proven as a promising eco‐friendly, and low‐cost absorbent material claim its practical applications. [ABSTRACT FROM AUTHOR]

Summary: In this study, we report a new phosphotungstic acid‐Titania embedded polyaniline (PANI/PTA/TiO2) nanocomposite modified hybrid electrode for efficient methanol electro‐oxidation reaction. The PANI/PTA/TiO2 nanocomposite was prepared via a simple in‐situ polymerization method. The fabricated modified electrode's surface morphology and elemental analysis were characterized using field‐emission scanning electron microscopy with energy‐dispersive X‐ray spectroscopy and mapping technique. The phase structure and molecular vibrational studies were identified using an X‐ray diffraction and Fourier‐transform infrared spectroscopic techniques. The electrochemical performance of the modified electrodes was studied using cyclic voltammetry, chronoamperometry, and electrochemical impedance spectroscopic techniques. The PANI/PTA/TiO2 nanohybrid modified electrode displayed the superior electro‐catalytic activity towards methanol oxidation reaction at 0.2 V potential with the charge transfer resistance of 218 Ω, and showed excellent stability up to 1200s in an alkaline medium. The developed nanocomposite material can be used as a potential nanohybrid anode catalyst for the application of direct methanol fuel cells. [ABSTRACT FROM AUTHOR]

Summary: In this study, a simple and facile electrochemical deposition technique was employed to fabricate fluorine‐doped tin oxide‐based polydiphenylamine‐polyaniline/phosphotungstic acid copolymer nanocomposite modified electrode (FTO/PDPA‐PANI/PTA) for high‐performance supercapacitors application. Crystalline and morphological structure and coating thickness of PDPA‐PANI/PTA nanocomposite on FTO were characterized using X‐ray diffraction, scanning electron microscope, and atomic force microscope. The fabricated nanohybrid electrode exhibits superior specific capacitance of 360 Fg−1 at 1 mA current density. The higher capacitive behavior and cyclic steadiness of FTO/PDPA‐PANI/PTA modified electrode were achieved because of the presence of tungsten in the PDPA/PANI co‐polymer nanonetworks provide efficient interaction which enhances the fast electron transfer progressions. Electrochemical impedance spectroscopic (EIS) studies ensure the capacitive behavior of the electrodeposited nanohybrid modified electrode with a characteristic EIS semicircle in the lower frequency region. Further, a superior specific capacitance with 82% excellent capacitance retention after 1000 cycles, recommends a practical application in supercapacitor device electrodes. [ABSTRACT FROM AUTHOR]