Figure 6.

Electrochemical performance of VOSO₄/CB2|SIPO–PTFE|RuO₂ fuel cells. a) Galvanostatic charge–discharge curves for cells with untreated, heat‐treated, and acid‐treated CB2 at a current density of 10 mA cm⁻². b) CV curves for cells with untreated, heat‐treated, and acid‐treated CB2 at a scan rate of 10 mV s⁻¹. c) Galvanostatic charge–discharge curves for various current densities. d) Electrical capacity and coulombic efficiency as a function of cycle number, where the current density was set to 10 mA cm⁻².