Figure 3: Structure of double perovskites on oxygen evolution.
From: Double perovskites as a family of highly active catalysts for oxygen evolution in alkaline solution
High-resolution TEM images (scale bars, 5 nm) and fast Fourier transforms (FFTs) of (a) dry (Pr0.5Ba0.5)CoO3−δ powder, (b) (Pr0.5Ba0.5)CoO3−δ exposed to tetrahydrofuran (THF), (c) (Pr0.5Ba0.5)CoO3−δ cycled between 1.1 and 1.7 V versus reversible hydrogen electrode (RHE) at 10 mV s−1 for 25 times and (d) (Pr0.5Ba0.5)CoO3−δ galvanostatically tested at 5 mA cm−2disk for 2 h. (Pr0.5Ba0.5)CoO3−δ mixed with Nafion and acetylene black carbon supported on a glassy carbon electrode with a loading of 0.25 mgoxide cm−2 was tested in O2-saturated 0.1 M KOH electrolyte. FFTs images were indexed using Pmmm as space group and ap × ap × 2ap lattice parameters. Red circles indicate reflection that uniquely belongs to the double perovskite structure.
