Effects of nano-SiO2 doped PbO2 as the positive electrode on the performance of lead-carbon hybrid capacitor

• Published in: Journal of colloid and interface science 2020-08, Vol.574, p.377-384
• Main Authors: Bao, Jinpeng, Lin, Nan, Guo, Jiaxiang, Gao, Weiqi, Liu, Zhiqiang, Lin, Haibo
• Format: Article
• Language: English
• Subjects: Effective utilization rate of active materials; Lead-carbon hybrid capacitor; Nano-SiO2; PbO2 electrode
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2020.03.082

[Display omitted] •The nano-SiO2/PbO2 electrode was prepared by the co-electrodeposition.•The nano-SiO2 can construct electrolyte diffusion channels in the electrode.•The energy density of the hybrid capacitor can reach 61 Wh kg−1 at 3 A g−1. The PbO2 electrodes of lead-acid batteries are normally applied as the positive electrodes in lead-carbon hybrid capacitors. However, the effective utilization rate of active materials in the electrodes is only about 12.5%, leading to a low energy density of lead-carbon hybrid capacitors. In this paper, a nano-SiO2 doped PbO2 electrode was prepared by the co-electrodeposition method. The energy density of the lead-carbon hybrid capacitor using a nano-SiO2/PbO2 electrode can reach 61 Wh kg−1 at 3 A g−1. The results show that the inert nano-SiO2 can establish electrolyte diffusion channels in the positive electrode, and thus improve the effective utilization rate of active materials. This work provides a new idea for the design and development of the positive materials for high-performance lead-carbon hybrid capacitors.