fig9

From: Recent advances in earth-abundant first-row transition metal (Fe, Co and Ni)-based electrocatalysts for the oxygen evolution reaction

Figure 9. (A) Schematic illustration of the binary soft-template-mediated synthesis of Fe-NiSe₂ UNWs. (B) TEM image, (C) HAADF-STEM image, and (D) HR-HAADF image of Fe-NiSe₂ UNWs. (E) STEM-EDS elemental mapping images of Fe-NiSe₂ UNWs, showing the distribution of Ni green, Fe yellow, and Se blue. (F) Polarization curves for OER on bare GC electrode and modified GC electrodes composed of the pure and Fe-doped NiSe₂ samples and commercial RuO₂. Catalyst loading: 0.2 mg cm^-2. Sweep rate: 5 mV s^-1. (G) Tafel plots for corresponding catalysts derived from (F). Reproduced with permission. Copyright 2018, Wiley^[107].