Enhancing the energy density of supercapacitors throughEnhancing the energy density of supercapacitors through advanced electrode materials is critical, yet doing so while preserving their outstanding cycling stability poses a formidable research challenge. Herein, 1,2-naphthoquinones (NQs) are anchored onto reduced graphene oxide (rGO) for assembling an organic molecular electrode (OME) via a facile one-step hydrothermal method. The as-prepared NQ-rGO demonstrates a Faradaic reaction at ∼0.34 V in a three-electrode system, alongside outstanding electrochemical properties: a high specific capacitance of 332 F g–1 at 5 mV s–1 and remarkable cycling stability (92% retention after 10,000 cycles). To pair with the prepared NQ-rGO, we constructed a negative electrode based on 1,2-Benzanthraquinone (BQ) functionalized rGO (BQ-rGO), which undergoes an electrochemical reaction near −0.07 V, thereby extending the operating voltage of the assembled asymmetric supercapacitor (ASC). The assembled ASC (NQ-rGO//BQ-rGO) achieves a high energy density of 32.09 Wh kg–1 at 570 W kg–1, with 90% capacitance retention after 10,000 cycles. The practical implementation was demonstrated by successfully illuminating 65 LEDs with two series-connected ASCs, confirming its application potential.
Zhou et al. (Mon,) studied this question.