Design and Fabrication of AC&GO Carbon‐Fiber Structural Supercapacitor with Balanced Mechanical and Electrochemical Properties

Abstract With the rapid advancements in global electric aircraft and energy storage, the integration of carbon‐fiber composite structures with energy storage technology has become a prominent topic. An AC&GO carbon fiber structural supercapacitor is designed by integrating the high specific surface area of AC with the excellent mechanical properties of GO, achieving a balanced mechanical and electrochemical performance. This supercapacitor exhibits high stability in charge–discharge characteristics, showing a capacitance of 75.79 mF cm ⁻² at a current density of 0.05 mA cm ⁻² and an energy density of 236.85 mWh m ⁻² . In addition, the maximum power density is 22.59 W m ⁻² at a current density of 1 mA cm ⁻² . The capacitance retention and coulombic efficiency are 98.99% and 96.52%, respectively, after 10 000 charge–discharge cycles at a current density of 0.2 mA cm ⁻² . Furthermore, after 15 000 cycles under load‐bearing and tensile conditions at a current density of 0.2 mA cm ⁻² , the capacitance retention is 98.52% and 93.05%, respectively, with the tensile strength remaining above 90% compared with non‐energy storage components. The multifunctional efficiency reaches 1.28, indicating the mechanical load bearing and electrochemical energy storage of AC&GO, thereby demonstrating its application potential in aerospace.