Figure 11.

A) Schematic fabrication process for the nanometer‐sized Fe‐CoOOH nanoparticles assembled on graphene by treating the CoFeAl‐LDH/G hybrids in concentrated alkaline solution. B) TEM images of nanometer‐sized Fe‐CoOOH/G nanohybrids a,b). C) N₂ adsorption/desorption isotherms of the Fe‐CoOOH/G nanohybrids and the pore size distribution calculated from the DFT method. D) Electrochemical performance of all as‐synthesized samples for OER. a) LSV curves; b) the corresponding Tafel plots; c) the corresponding kinetics (Tafel slope) and activity (the overpotential required to achieve 10 mA cm⁻²) of all samples in contrast to other references; d) electrochemical impedance spectroscopy of the as‐synthesized CoOOH/G, Fe‐CoOOH, and Fe‐CoOOH/G electrocatalysts at the potential of 1.60 V; e) the estimation of C_dl for CoOOH/G, Fe‐CoOOH, and Fe‐CoOOH/G; f) chronopotentiometry curves of the Fe‐CoOOH/G, CoOOH/G, and RuO₂ at a constant current density of 10 mA cm⁻². Reproduced with permission.92 Copyright 2017, Wiley‐VCH.