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Abstract Iron‐substituted CoOOH porous nanosheet arrays grown on carbon fiber cloth (denoted as Fe x Co 1−x OOH PNSAs/CFC, 0≤x≤0.33) with 3D hierarchical structures are synthesized by in situ anodic oxidation of α‐Co(OH) 2 NSAs/CFC in solution of 0.01 m (NH 4 ) 2 Fe(SO 4 ) 2 . X‐ray absorption fine spectra (XAFS) demonstrate that CoO 6 octahedral structure in CoOOH can be partially substituted by FeO 6 octahedrons during the transformation from α‐Co(OH) 2 to Fe x Co 1−x OOH, and this is confirmed for the first time in this study. The content of Fe in Fe x Co 1−x OOH, no more than 1/3 of Co, can be controlled by adjusting the in situ anodic oxidation time. Fe 0.33 Co 0.67 OOH PNSAs/CFC shows superior OER electrocatalytic performance, with a low overpotential of 266 mV at 10 mA cm −2 , small Tafel slope of 30 mV dec −1 , and high durability.
Ye et al. (Thu,) studied this question.