Fig. 9. ORR 3D RC-SECM images of MnWO₄–BF synthesized at four TSC concentrations, namely 0, 5, 10 and 15 mM at different substrate potentials: (a) 0.80 V, (b) 0.55 V, (c) 0.25 V and (d) 0.15 V. The tip (Pt UME 10 μm in diameter) was held at 0.55 V at a 10 μm distance from the sample in a 0.1 M NaOH electrolyte, (e) RDE results for the studied TSC concentrations. Counter electrode: Pt coil and reference electrode: Ag/AgCl/3 M KCl (potentials converted to the RHE scale). Reproduced from ref. 132 with permission from the Royal Society of Chemistry © 2018.