ChemElectroChem 2018-03-25

Asphalt‐Derived Hierarchically Porous Carbon with Superior Electrode Property in the Capacitive Storage Devices

Xinyu Song; Xinlong Ma; Zhiqing Yu; Guoqing Ning; Yun Li; Yuzhen Sun

Index: 10.1002/celc.201800208

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Abstract

Active carbon with hierarchical pore structure (HPC) is massively prepared using asphalt as carbon precursor, by a template directed method. The as‐prepared HPC exhibits excellent capacitive energy‐storage capacities on symmetric supercapacitor (140 F g‐1 at 0.5 A g‐1) and Li ion capacitor (LIC) using HPC as both cathode and anode (340 F g‐1 at 0.5 A g‐1), as well as ultralong cyclability for supercapacitor (no capacity loss after 15000 cycles) and LIC (91.3% capacitance retention after 10000 cycles). The superior energy density and power density are 202 W kg‐1 and 15398 Wh kg‐1 respectively. The hierarchical pore structure coordinate with the existence of heteroatoms that originated from carbon precursor are conducive to the delivery of the electrolyte ions and electrons, greatly contributing to the high capacitance and the excellent cycle performance. The work provides a very promising opportunity for high capacitive energy storage devices by means of the high value‐added utilization of the asphalt.