Sindhu, Sarita2026-06-192026-06-192025Sindhu, S., Kumar, V., Bulla, M., Kumar, S., Sheokand, A., Dahiya, R., Sisodia, A.K. and Mishra, A.K., 2025. Development of an efficient supercapacitor using hydrothermally synthesized nickel sulfide. Journal of Materials Science: Materials in Electronics, 36(19), pp.1-12.https://doi.org/10.1007/s10854-025-15248-2https://hdl.handle.net/10566/24616The current research explores the hydrothermal synthesis of nickel sulfide over a temperature range of 120–180°C, with advanced characterization used to assess features influencing its electrochemical behavior in supercapacitor applications. The temperature variation in the synthesis process results in a pure β-NiS phase at lower temperatures, while at higher temperatures, up to 180°C, mixed phases were confirmed by XRD, with FTIR revealing the characteristic vibrational modes of nickel sulfide. FE-SEM micrographs show a morphological transition from nanoflakes to microflowers to agglomerated flakes, influencing the specific surface area (10.45 m2g⁻1), for the sample synthesized at 140 °C, as determined by BET analysis. The electrochemical analysis of the fabricated electrodes was conducted in different electrolytes, revealing that NiS synthesized at 140°C achieves the highest capacitance of 294 Fg⁻1 at 1 A g⁻1 in KOH, establishing it as a promising candidate for supercapacitor applications.enelectrochemical eletrodeselectrolytic capacitorshydrothermal synthesisiron compoundsArticle