▎ 摘　　要

A supercapacitor is a device which can store electrical energy on conductive materials with a highly porous structure. Carbon-based electrochemical capacitors exhibit fast charge/discharge rate and high power density but limited by low energy density compared with lithium ion batteries. We used the self-assembly method to construct a three-dimensional graphene-based nanoporous carbon derived from graphene/carbonized metal-organic frameworks composite, which exhibits a high specific surface area (1849 m(2) g(-1)) and a remarkable capacitance of 472 F g(-1) at 1 mV s(-1) and 420 F g(-1) at 1 A g(-1) in aqueous electrolyte. The specific capacitance of 397 F g(-1) at 1 A g(-1) measured in the organic electrolyte with voltage window up to 3 V leads to a high energy density of 124.1 Wh kg(-1) achieved in a symmetrical capacitor device. The progress of this material is close to the theoretical capacitance of carbon-based material (550 F g(-1)) and readily scalable to practical applications. (C) 2019 Elsevier Ltd. All rights reserved.