Facile Synthesis of Porous‐Carbon Nanoarchitectures as Advanced and Durable Electrodes for Supercapacitors

Abstract

Abstract Carbon nanomaterials with remarkable capacitance are highly notable. Although electronic double‐layer capacitors exhibit high power density, their low energy density blocks the practical utility of these carbon materials. Herein, a type of porous‐carbon nanoarchitecture with significant capacitive performance is successfully synthesized using a ZnO template and KOH activation. Benefiting from its excellent conductivity, ultrahigh surface area, and porous architecture, the as‐prepared porous carbon delivers a high capacitance of 245.4 mF cm −2 at a current density of 2 mA cm −2 with impressive rate performance. Moreover, it shows superior cycling durability with more than 99% capacitance retention after 10 000 cycles. A cost‐effective, eco‐friendly, and promising strategy is proposed for the large‐scale preparation of porous‐carbon nanomaterial electrodes.