作者：Haitao Zhang, Lei Zhang, Jun Chen, Hai Su, Fangyan Liu, Weiqing Yang
關鍵字：Supercapacitors, Hierarchically porous carbons, Neutral aqueous electrolytes, High performance
論文來源：期刊
發表時間：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.