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MnO₂ is considered as one of the most promising electrode materials for flexible supercapacitors but it often suffer in poor conductivity, which limits practical applications according to industry needs. To enhance the performance, forming MnO₂-based hybrid structures with conductive materials is a promising implement approach. Ti₃C₂T_x MXene sheets, a new kind of 2D transition metal carbides with metallic conductivity and hydrophilic nature, are promising candidate to couple with MnO₂. According to the complementary principle, we design a novel structure MnO₂/Ti₃C₂T_x hybrid nanocomposite by synergistically coupling one-dimensional (1D) MnO₂ nanoneedles with two-dimensional (2D) Ti₃C₂T_x MXene sheet for flexible supercapacitor. XPS investigations suggest the obvious charge transfer from Ti₃C₂T_x sheets to MnO₂ nanoneedles, where Ti₃C₂T_x sheets serve as a remarkable 2D conductive substrate to …