| 초록 |
Pseudocapacitors have recently attracted attention as a promising new energy storage system, which can potentially bridge the performance gap between lithium ion batteries and conventional capacitors. To further improve the performance of these pseudocapacitors, tailoring the transition metal sulfides along with developing new methods for controlling resultant nanostructures in a predictive way is an essential requirement for achieving more favorable electrochemical kinetics. Herein, utilizing a solution-based sulfur precursor, one-dimensional single-crystalline Cu2S nanostructures have been successfully prepared via a solution-based direct synthesis process at room temperature without the need for thermal treatment steps. We have managed to obtain one-dimensional (1-D) and two-dimensional Cu2S nanostructured electrodes on a copper substrate. The morphology of the Cu2S electrode can be tuned by altering the driving force for crystal growth during the synthesis. The fabricated electrode exhibits a capacitance of 750 mF cm-2 at a current density of 2 mA cm-2. Moreover, the rate capacitance is maintained at about 82.3% as the current density is increased to 40 mA cm−2, and the capacity retains 90.5% according to the 1-D morphology. The synthetic method ensures a facile and efficient approach to fabricating scalable multi-dimensional crystalline Cu2S nanostructures, highlighting the uniqueness of the solution-based sulfur activation method. |
