Deciphering the energy storage and electro‐catalytic potential of the <scp>BaLa₂MnS₅</scp> ternary metallic sulfide prepared via single source precursor route

Abstract The present work elucidates the first report on the synthesis and energy applications of the novel BaLa 2 MnS 5 prepared from single source precursor route. This metal chalcogenide expressed a tuned band gap of 3.84 eV and an average crystallite size of 20.52 nm. Functional groups explored for BaLa 2 MnS 5 expressed strong signals for presence of the metal sulfide bonds. The thermal decomposition pattern of BaLa 2 MnS 5 followed a two‐phased mechanism. Synthesized metal sulfide possessed an irregular morphology with particles arranged in random manner. An assessment of the chalcogenide BaLa 2 MnS 5 for energy applications has been carried out. When employed as an electrode material in 1 M KOH, which acted as the background electrolyte, BaLa 2 MnS 5 chalcogenide showed a specific capacitance of 597 F g −1 . Furthermore, this BaLa 2 MnS 5 chalcogenide decorated electrode has a low resistance, as shown by the R s of 1.35 Ω, and a specific power density of 7366 W kg −1 , according to the impedance investigations. The electrochemical results for the OER activity are indicative of the OER overpotential and Tafel slope values as 388 mV and 108 mV/dec. This electrode achieved the HER overpotential value of 241 mV while the obtained Tafel slope was 194 mV/dec.

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