writer：Haitao Zhang, Lei Zhang, Jun Chen, Hai Su, Fangyan Liu, Weiqing Yang
keywords：Supercapacitors, Hierarchically porous carbons, Neutral aqueous electrolytes, High performance
source：期刊
Issue time：2016年

With plenty of unique porous structure at micro-/nano scale, hierarchically porous carbons (HPCs) are

promising for usage in advanced electric double layer supercapacitors (EDLCs) as the electrode materials.

However, wide-range adoption of HPC for practical application is largely shadowed by its extremely

complex synthesis process with considerably low production efficiency. Herein we reported a simple

template-free, one-step sintering method, to massively produce the HPCs for high-performance EDLCs.

Resorting to the 3D structure modification of the wide pore size distribution, high surface area of HPCs

(up to 3000 m2 g1) was achieved. By using 1 M Na2SO4 as electrolyte, the as-fabricated HPCs based

EDLCs can be operated reversibly over a wide voltage window of 1.6 V with superior specific capacitance

of 240 F g1 under a current density of 0.5 A g1. In the meanwhile, the EDLCs exhibit excellent rate

capability (high power density of 16 kW kg1 at 10.2 Wh kg1) and long-term cycling stability with 9%

loss of its initial capacitance after 2000 cycles. This output performance distinguished itself among most

of the carbon-based EDLCs with neutral aqueous electrolyte. Thus, the template-free one-step sintering

method produced HPCs for EDLCs represents a new approach for high-performance energy storage.