Issue

Vol. 12 (2020)

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

https://doi.org/10.1007/s40820-020-00454-w
Haiyan Luo
State Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, People’s Republic of China
Maoxin Chen
State Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, People’s Republic of China
Jinhui Cao
State Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, People’s Republic of China
Meng Zhang
State Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, People’s Republic of China
Shan Tan
State Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, People’s Republic of China
Lei Wang
State Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, People’s Republic of China
Jiang Zhong
State Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, People’s Republic of China
Hongli Deng
State Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, People’s Republic of China
Jian Zhu
State Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, People’s Republic of China
Bingan Lu
State Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, People’s Republic of China

Corresponding Author: Jian Zhu

jzhu@hnu.edu.cn

Nano-Micro Letters, Vol. 12 (2020), Article Number: 113

Abstract

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.


Highlights:


1 The hierarchically porous nitrogen-doped carbon (SHPNC) was fabricated by biorenewable carbon sources.
2 The SHPNC electrode exhibited a high specific capacity, excellent cyclic stability, and superior rate capability.
3 The asymmetric potassium-ion hybrid capacitors delivered a maximum energy density of 135 Wh kg−1, long lifespan with excellent capacity retention, and outstanding ultrafast charge/slow discharge performance.

Keywords

Potassium-ion hybrid capacitors Biomimetic materials engineering N-doped carbon Hierarchically porous structure High energy density Fundamental Research Funds of the Central Universities (No. 531107051048)
Luo, Haiyan, Maoxin Chen, Jinhui Cao, Meng Zhang, Shan Tan, Lei Wang, Jiang Zhong, Hongli Deng, Jian Zhu, and Bingan Lu. 2020. “Cocoon Silk-Derived, Hierarchically Porous Carbon As Anode for Highly Robust Potassium-Ion Hybrid Capacitors”. Nano-Micro Letters 12 (May):113. https://doi.org/10.1007/s40820-020-00454-w.
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