Sulfur-Rich N-Doped Co₉S₈ Catalyst for Highly Efficient and Durable Overall Water Electrolysis Application

Figure 7

The overall electrolysis performance of the S,N-Co₉S₈ as a bifunctional catalyst in 1.0 M KOH electrolyte medium. (a) Polarization curves obtained at 5.0 mV s⁻¹ before and after long-term chronopotentiometric stability. (b) Comparative full-cell voltage of our S,N-Co₉S₈||S,N-Co₉S₈ bifunctional catalyst and previously reported cobalt-sulfide-based catalysts. (c) Voltage-step profile and (d) chronopotentiometric stabilities measured at 10, 50, and 100 mA cm⁻².

(a)

(b)

(c)

(d)