Abstract
Abstract In this work, the electrochemical properties of rare earth lanthanum sulfide (La 2 S 3 ) films obtained by chemical bath deposition method are investigated as an electrode material for supercapacitor application. The effect of air annealing on structural, surface morphological and wettability properties of La 2 S 3 films is studied. The X-ray diffraction and FT-Raman analysis confirm the formation La 2 S 3 film. A porous spongy network of La 2 S 3 film reveals the hydrophilic nature. The supercapacitive properties of La 2 S 3 electrode are evaluated using cyclic voltammetry and galvanostatic charge–discharge mode. The maximum specific capacitance of 294 F g − 1 is achieved for air-annealed La 2 S 3 electrode at a scan rate of 5 mV s − 1 with 89 % electrochemical cyclic stability over 1000 cycles. The spongy network of air-annealed La 2 S 3 film enhances the supercapacitive performance. The auspicious properties of La 2 S 3 electrode are effective for the fabrication of flexible La 2 S 3 /LiClO 4 -PVA/La 2 S 3 solid-state supercapacitor device. The specific capacitance of supercapacitor device with diverse bending angles and cyclic stability is examined.
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