Cocoon Silk-Derived, Hierarchically Porous Carbon as Anode for Highly Robust Potassium-Ion Hybrid Capacitors  

作　　者：Haiyan Luo Maoxin Chen Jinhui Cao Meng Zhang Shan Tan Lei Wang Jiang Zhong Hongli Deng Jian Zhu Bingan Lu 

机构地区：[1] State Key Laboratory for Chemo/Biosensing and Chemometrics,Hunan University,Changsha 410082,People’s Republic of China [2] College of Chemistry and Chemical Engineering,Hunan Key Laboratory of Two‑Dimensional Materials,Hunan University,Changsha 410082,People’s Republic of China

出　　处：《Nano-Micro Letters》2020年第9期83-95,共13页纳微快报（英文版）

基　　金：financially supported by the Fundamental Research Funds of the Central Universities(No.531118010112);the Double FirstClass University Initiative of Hunan University(No.531109100004);the Fundamental Research Funds of the Central Universities(No.531107051048);support from the Hunan Key Laboratory of TwoDimensional Materials(No.801200005)。

摘　　要：Potassium-ion hybrid capacitors(KIHCs) have attracted increasing research interest because of the virtues of potassium-ion batteries and supercapacitors.The development of KIHCs is subject to the investigation of applicable K+storage materials which are able to accommodate the relatively large size and high activity of potassium.Here,we report a cocoon silk chemistry strategy to synthesize a hierarchically porous nitrogen-doped carbon(SHPNC).The as-prepared SHPNC with high surface area and rich N-doping not only offers highly efficient channels for the fast transport of electrons and K ions during cycling,but also provides sufficient void space to relieve volume expansion of electrode and improves its stability.Therefore,KIHCs with SHPNC anode and activated carbon cathode afford high energy of 135 Wh kg-1(calculated based on the total mass of anode and cathode),long lifespan,and ultrafast charge/slow discharge performance.This study defines that the KIHCs show great application prospect in the field of high-performance energy storage devices.

关 键 词：Potassium-ion hybrid capacitors Biomimetic materials engineering N-doped carbon Hierarchically porous structure High energy density 

分 类 号：TM912[电气工程—电力电子与电力传动] TM53