| 초록 |
Recently, pseudocapacitor has received much attention because it has high capacitance and fast charging-discharging from electrochemical reaction at the electrode surface. However, synthesizing and developing highly efficient, inexpensive and new pseudocapacitive electrode materials is still challenging. Mackinawite iron sulfide is easily synthesized, and has high conductivity and a wide range of valence states which is suitable as an electrode material candidate for energy-storage devices. Here, we report a simple method to synthesize alkylammonium-intercalated Mackinawite iron sulfide as pseudocapacitive electrode materials. The interlayer distance is successfully controlled from the 0.5 nm to 1.3 nm. The density functional theory calculations for the stable structure of the system agree well with experimental observations. The tetraethylammonium-intercalated iron sulfide based electrodes show 2,225 F/g at scan rate of 1 mV/s and retain 1,302 F/g at 20 mV/s |
