Abstract
Petroleum coke is a valuable and potential source for clean energy storage if it could be modified legitimately and facilely. In the present study, porous carbon with high surface area and abundant oxygen-containing groups was prepared from petroleum coke by chemical activation and modification processes. The as-prepared carbon exhibits a high surface area (1129 m2 · g−1) and stable micrographic structure. It presents a high specific capacitance and excellent rate performance in KOH electrolyte. Even at an ultrahigh current density of 50 A · g−1, the specific capacitance of the prepared carbon can still reach up to an unprecedented value of 261 F · g−1 with a superhigh retention rate of 81 %. In addition, the energy density of this material in aqueous electrolyte can be as high as 13.9 Wh · kg−1. The high energy density and excellent rate performance ensure its prosperous application in high-power energy storage system.
Highlights
Environment-friendly energy supply is seemed to be one of the biggest concerns which is closely associated with our lives [1]
The TEM image (Fig. 1b) of petroleum coke derived activated carbon (PCAC) clearly illustrates the amorphous, worm-like micropores formed during the activation process
The irregular particles with abundant micropores can provide a large adsorption interface for electrolyte ions, which is beneficial for its electrochemical double layer (EDL) capacitive performance
Summary
Environment-friendly energy supply is seemed to be one of the biggest concerns which is closely associated with our lives [1]. Portable electronic devices and hybrid electric vehicles, with power source of electric energy resource, are growing very fast in recent years In this regard, efficient electrical energy storage systems have gradually caused extensive concern [1, 3,4,5]. Supercapacitors are very attractive owing to their superior power density (>10 kW · kg−1), fast charge/discharge rates (within seconds), and long cycle lifetime (>105) compared to other chemical energy storage devices [6, 7]. They can play a vital role in some
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