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Abstract
Electrochemical energy systems mark a pivotal advancement in the energy sector, delivering substantial improvements over conventional systems. Yet, a major challenge remains the deficiency in storage technology to effectively retain the energy produced. Amongst these are batteries and supercapacitors, renowned for their versatility and efficiency, which depend heavily on the quality of their electrode materials. Metal oxide composites, in particular, have emerged as highly promising due to the synergistic effects that significantly enhance their functionality and efficiency beyond individual components. This review explores the application of metal oxide composites in the electrodes of batteries and SCs, focusing on various material perspectives and synthesis methodologies, including exfoliation and hydrothermal/solvothermal processes. It also examines how these methods influence device performance. Furthermore, the review confronts the challenges and charts future directions for metal oxide composite-based energy storage systems, critically evaluating aspects such as scalability of synthesis, cost-effectiveness, environmental sustainability, and integration with advanced nanomaterials and electrolytes. These factors are crucial for advancing next-generation energy storage technologies, striving to enhance performance while upholding sustainability and economic viability.
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Details

1 Jeju National University, Nanomaterials & System Laboratory, Major of Mechatronics Engineering, Faculty of Applied Energy System, Jeju, South Korea (GRID:grid.411277.6) (ISNI:0000 0001 0725 5207); Research Institute of New Energy Industry (RINEI), Jeju National University, Jeju, South Korea (GRID:grid.411277.6) (ISNI:0000 0001 0725 5207)
2 Jeju National University, Nanomaterials & System Laboratory, Major of Mechatronics Engineering, Faculty of Applied Energy System, Jeju, South Korea (GRID:grid.411277.6) (ISNI:0000 0001 0725 5207)
3 Jeju National University, Nanomaterials & System Laboratory, Major of Mechatronics Engineering, Faculty of Applied Energy System, Jeju, South Korea (GRID:grid.411277.6) (ISNI:0000 0001 0725 5207); Research Institute of New Energy Industry (RINEI), Jeju National University, Jeju, South Korea (GRID:grid.411277.6) (ISNI:0000 0001 0725 5207); Jeju National University, Nanomaterials & System Lab, Major of Mechanical System Engineering, College of Engineering, Jeju, South Korea (GRID:grid.411277.6) (ISNI:0000 0001 0725 5207)
4 Jeju National University, Department of Physics, Jeju, South Korea (GRID:grid.411277.6) (ISNI:0000 0001 0725 5207)