fig4

Figure 4. (A) Schematic illustration of the synthesis of P-NSC/Ni₄Fe₅S₈-1000; (B) TEM images of P-NSC/Ni₄Fe₅S₈-1000: (B-1) 500 nm and (B-2) 100 nm; (C) Steady-state polarization curves and (D) the corresponding Tafel plots of NSC/Ni₄Fe₅S₈-1000 (without porous structure) and P-NSC/Ni₄Fe₅S₈-1000 (with porous structure) and commercial RuO₂ (Alfa Aesar). Reproduced with permission. Copyright 2019, Royal Society of Chemistry^[58].