The significant power density and rapid charge-discharge capabilities of supercapacitors render attractive renewable energy storage solutions. Over the years, binary metal sulfides (BMSs) have gained significant interest for use in electrochemical energy storage systems. Specifically, the electrochemical performance of Mn and Co sulfide materials is recognized to be superior compared to that of their oxide counterparts. Nonetheless, the cyclic stability and minimal retention capability of these sulfides restrict their effectiveness. In comparison to their separate sulfide equivalents, BMSs exhibit quicker redox reactions and improved electronic conductivity; however, their stability and capacity retention remain challenged. In this context, atomic layer deposition (ALD) has evolved into an advanced deposition method that allows for performance optimization via atomic level conformal deposition and aids in maintaining stable surface reactions over extended periods. Researchers now possess enhanced understanding of the interactions between the electrode and the electrolyte due to the influence of ALD thickness on performance. Consequently, this study forms a core-shell nanoarchitecture composed of bimetallic sulphide@oxide ALD: MnCo2S4@CoOx, with MnCo2S4 synthesized through a hydrothermal sulfurization method and CoOx produced via an ALD technique. The effectiveness of electrochemical reactions is greatly influenced by ALD thin films and nanostructured surfaces, which have been studied and evaluated.
