Recent advances in the synthesis of non-carbon two-dimensional electrode materials for the aqueous e

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Supercapacitors (SCs) with high power density and long cycling span life are demanding energy storage devices that will be an attractive power solution to modern electronic and electrical applications. Numer-ous theoretical and experimental works have been devoted to exploring various possibilities to increase the functionality and the specific capacitance of electrodes for SCs. Non-carbon two-dimensional (2D) materials have been considered as encouraging electrode candidates for their chemical and physical ad-vantages such as tunable surface chemistry, high electronic conductivity, large mechanical strength, more active sites, and dual non-faradaic and faradaic electrochemical performances. Besides, these 2D mate-rials also play particular roles in constructing highway channels for fast ion diffusion. This concise re-view summarizes cutting-edge progress of some representative 2D non-carbon materials for the aqueous electrolyte-based SCs, including transition metal oxides (TMOs), transition metal hydroxides (TMHs), tran-sition metal chalcogenides (TMCs), MXenes, metal-organic frameworks (MOFs) and some emerging ma-terials. Different synthetic methods, effective structural designs and corresponding electrochemical per-formances are reviewed in detail. And we finally present a detailed discussion of the current intractable challenges and technical bottlenecks, and highlight future directions and opportunities for the develop-ment of next-generation high-performance energy storage devices.
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