Ternary metal sulfides with first-row transition metals have attracted considerable research interest as inexpensive electrode materials for energy applications, owing to their remarkable electrochemical activity. These complex metal sulfides surpass conventional metal oxides in terms of higher conductivity, enhanced compositional tunability, and easier synthesis requirements. However, the absence of a scalable and low-cost production method for ternary metal sulfide nanoparticles hampers their widespread implementation in electrode structures. In this study, we aim to explore scalable synthesis methods for two popular ternary metal sulfide systems, nickel cobalt sulfide (NiCo2S4) and copper iron sulfide (CuFeS2), and evaluate their suitability for energy storage and electrochromic energy applications. By devising cost-effective and reproducible synthesis techniques for these materials, we aim to overcome the current synthetic challenges and support advanced research in energy devices. Ultimately, this research holds great promise for advancing the development of high-performance, cost-effective electrode materials, thus driving the progress of sustainable energy technologies.