Table 1 Fitting values of the electrochemical impedance profiles of the as-prepared and annealed Cu2SnS3
Sample | RS (Ω) | Rct (Ω) | Rsei (Ω) |
|---|---|---|---|
As-prepared (OCV) | 4 | 162.4 | |
Annealed at 540℃ (OCV) | 2.4 | 39.7 | |
As-prepared (after 2 cycles) | 3 | 206.6 | 61.2 |
Annealed at 540℃ (after 2 cycles) | 3.9 | 25.9 | 35.3 |