Fig. 4

TG-DSC curves of FeS samples C2 (6%-2 h) and C8 (6%-8 h) under dry air (50 mL/min, 10 °C/min). (a) FeS treated with 6% passivator for 2 h (C2). (b) FeS treated with 6% passivator for 8 h (C8).

TG-DSC curves of FeS samples C2 (6%-2 h) and C8 (6%-8 h) under dry air (50 mL/min, 10 °C/min). (a) FeS treated with 6% passivator for 2 h (C2). (b) FeS treated with 6% passivator for 8 h (C8).