Abstract: By using reduced graphene oxide (rGO) as the conductive substrate and selecting the reversible electrochemically active organic molecule 6,7-dihydroxycoumarin (DHC) to interact with rGO in a noncovalent π-π manner through a noncovalent functionalization strategy, DHC noncovalently functionalized graphene composite electrode materials (DHC-rGO) are designed and prepared, and their practical energy storage performance is investigated. It exhibits a high specific capacitance of 308 F·g⁻¹ at a scanning rate of 10 mV·s⁻¹, and the capacitance retention rate is still as high as 87% when the scanning rate is increased to 100 mV·s⁻¹, which shows its excellent multiplicative performance. The asymmetric supercapacitors (HAQ-rGO//DHC-rGO-2, ASC) assembled with 2-hydroxyanthraquinone-reduced graphene oxide (HAQ-rGO) as the negative electrode and DHC-rGO-2 as the positive electrode can achieve an energy density of up to 27.69 Wh·kg⁻¹ at a power density of 800 W·kg⁻¹ under an operating voltage of 1.6 V. In addition, two ASC connected in series successfully drove 55 LEDs, demonstrating their great potential for energy storage device applications in portable consumer electronics.