fig3

From: Synergistic anionic and cationic co-doping in cobalt hydroxide for enhanced hydrogen production coupled with urea electrooxidation

Figure 3. Electrochemical HER and UOR activity. (A) LSV curves and corresponding (B) Tafel slopes for HER; (C) Comparisons of overpotentials; (D) Calculated electrochemical C_dl; (E) LSV curves of S,W-Co(OH)₂/NF before and after 5,000 and 10,000 CV cycles during HER testing; (F) LSV comparison of UOR and OER for S,W-Co(OH)₂/NF; (G) LSV curves for UOR of the as-prepared catalysts (S,W-Co(OH)₂/NF achieves 1.41 V at 200 mA cm^-2 and 1.45 V at 500 mA cm^-2); (H) EIS profiles of various samples recorded at 0.45 V during UOR testing; (I) UOR stability of S,W-Co(OH)₂/NF. RHE: Reversible hydrogen electrode: NF: nickel foam; HER: hydrogen evolution reaction; UOR: urea oxidation reaction; LSV: linear sweep voltammetry; C_dl: double-layer capacitance; CV: cyclic voltammetry; OER: cyclic voltammetry; EIS: electrochemical impedance spectroscopy.