[en] Highlights: • The first synthesis of carnation flower-like SnS₂ (CF-SnS₂) by one-step solvothermal method and CF-SnS₂ growth mechanism studies were reported. • CF-SnS₂ morphology and the hexagonal crystallographic phase with peak (001) plane was verified by various peak analyses including XRD and Raman, enlightening that the novel surface chemistry enhance the performance of electrodes in super capacitors. • Pore accessibility of electrolyte ions in the CF-SnS₂ depending on frequency was systematically studied by using electrochemical impedance spectroscopy, substantiating that the good capacitive nature and excellent cyclic stability of the CF- SnS₂-based supercapacitor were strongly influenced by the ion accessibility in this system. - Abstract: We report the synthesis of carnation flower-like SnS₂ (CF-SnS₂) via a one-step solvothermal method for potential application as supercapacitor electrodes in energy storage devices. The structural and morphological properties of CF-SnS₂ were characterized by X-ray diffraction, Raman analysis, and field-emission scanning and transmission electron microscopies. X-ray photoelectron spectroscopy and scanning tunneling electron microscopy with color mapping verified the distribution of Sn and S, and depicted the successful formation of SnS₂. Electrochemical studies were performed to explore the supercapacitive nature of CF-SnS₂. Supercapacitors with CF-SnS₂ electrodes delivered excellent cyclic voltammetry performances, superior gravimetric specific capacitances, and high power densities. The evaluated specific capacitance and power density reached ∼524.5 F/g and 12.3 W/kg, respectively, at a current density of 0.08 A/g, and ∼215.9 F/g and 61.4 W/kg, respectively, at a current density of 0.38 A/g. These values are at least two times higher than those previously reported. The long-term cyclic stability was also tested to demonstrate the endurance of the CF-SnS₂-based supercapacitor, with a 66% rate retention and galvanostatic charge/discharge reversibility. These electrochemical findings indicate that CF-SnS₂ is a promising candidate for electrode materials in supercapacitor applications.