| 초록 |
Sodium ion capacitor is considered as very attractive an alternative to lithium-ion energy storage due to the abundance and low cost of sodium. However, during the charging and discharging processes, the metal-based electrode for Na-ion energy storage system often shows poor intrinsic electrical conductivity and large capacity decay. Here, we report a high-performance Na-ion energy storage device using novel phosphorous-doped porous carbon derived from renewable, sustainable and accessible biomass, empty fruit bunch (EFB) by a thermal process. The carbon nanomaterials have highly active sites and well-developed pores with the highest surface area of ~ 1154.2 m2 g-1 and high mass content of phosphorus of ~ 19.67 %. The biomass derived electrode for Na-ion capacitor exhibits a high capacity of ~233.81 F g-1, long cycle life of ~ 96 % after 1000 cycles and stable rate capability of ~ 70 % at scan rate 70 mV s-1. |
