Boosting the performance of nickel–cobalt LDH cathode with phosphorus and selenium co-doping for hybrid supercapacitor
Xinyu Shan, Zuoxing Guo, Zihan Qu, Yining Zou, Lijun Zhao, Peng Chen
Abstract
Through composition design and structural regulation, low electronegativity selenium and phosphorus were doped into NiCo LDH nanosheets to prepare phosphorus and selenium co-doped nickel–cobalt layered double hydroxide electrodes (P, Se-NiCo LDH), which can enhance the availability of active sites, significantly improve the conductivity and promote the reaction kinetics. Prepared it as a positive cathode of supercapacitor ultrahigh energy density (61.23 Wh kg−1) and power density (16496.5 W kg−1) can be obtained. Rate performance of the hybrid supercapacitor can be maintained 50.9% at 20 A g−1. Both excellent rate performance and energy density may promote the wider application of supercapacitors.