3D nitrogen-doped framework carbon for high-performance potassium ion hybrid capacitor

By Bingjun Yang, Jiangtao Chen, Lingyang Liu, P. Ma, Baoyong Liu, Junwei Lang, Yu Tang, Xingbin Yan. 2019

180 citations recorded by the source corpus.

Abstract Post-lithium ion hybrid capacitors have great potential to serve as mid-to large-scale energy storage applications because of their high energy/power densities, abundant resources and low cost. Here we report a high-performance dual-carbon potassium ion hybrid capacitor (PIHC) based on two carbon electrode materials derived from a single precursor–ethylene diamine tetraacetic acid tetrasodium (EDTA-4Na). By means of a simple calcination, the EDTA-4Na can be directly converted to a three-dimensional (3D) nitrogen-doped framework carbon (3DNFC) that exhibits high reversible capacity and good electrochemical kinetic property for potassium ion storage. Such 3DNFC can be further converted to a 3D nitrogen-doped framework activated carbon (3DNFAC) that shows ultrahigh specific surface area (3839 m2 g−1) and excellent capacitance performance. Using the 3DNFC as battery-type anode and the 3DNFAC as capacitor-type cathode, a dual-carbon PIHC is fabricated, and it is able to normally work at 0–4.2 V, delivers high energy and power densities (163.5 Wh kg−1 at 210 W kg−1, and 76.4 Wh kg−1 at 21 000 W kg−1), and exhibits outstanding cycling stability (91.7% capacity retention after 10 000 cycles at 2.0 A g−1), which are all the best values for the state-of-the-art PIHCs.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/d195adc66eb322a2fe4222e9b5a9994576a90eb7