LAUSR

Three‐dimensional (3D) porous carbonaceous materials offer numerous merits such as light‐weight, high surface area, flexibility, and thus hold immense potential in energy storage applications. In this work, we report preparation of nitrogen‐rich free‐standing compressible porous neuron‐like carbon sponge using commercially available kitchen sponge by a facile, cost‐effective, and scalable synthetic strategy. The unique neuron‐like bubbled interconnected carbon structure with enhanced N/O functionalities improves the electrochemical performance by providing sufficient space for ion transport and large accessible surface‐active sites. This material also delivers high current response under compressive stress acting as a pressure sensor. This bubbled carbon material achieves an improved specific capacitance of 268.5 F g−1 at 0.5 A g−1. As a self‐supporting electrode in a symmetrical supercapacitor cell, it still delivers a good specific capacitance of 167 F g−1 at 0.35 A g−1, retaining 92.5% of capacitance over 7000 charge/discharge cycles. Furthermore, the device delivers a maximum energy density of 14.8 Wh Kg−1, demonstrating its immense potential for multi‐functional applications owing to its unique features.