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Activating CoOOH Porous Nanosheet Arrays by Partial Iron Substitution for Efficient Oxygen Evolution Reaction
558
Citations
50
References
2018
Year
Iron-substituted CoOOH porous nanosheet arrays grown on carbon fiber cloth (denoted as Fe<sub>x</sub> Co<sub>1-x</sub> OOH PNSAs/CFC, 0≤x≤0.33) with 3D hierarchical structures are synthesized by in situ anodic oxidation of α-Co(OH)<sub>2</sub> NSAs/CFC in solution of 0.01 m (NH<sub>4</sub> )<sub>2</sub> Fe(SO<sub>4</sub> )<sub>2</sub> . X-ray absorption fine spectra (XAFS) demonstrate that CoO<sub>6</sub> octahedral structure in CoOOH can be partially substituted by FeO<sub>6</sub> octahedrons during the transformation from α-Co(OH)<sub>2</sub> to Fe<sub>x</sub> Co<sub>1-x</sub> OOH, and this is confirmed for the first time in this study. The content of Fe in Fe<sub>x</sub> Co<sub>1-x</sub> OOH, no more than 1/3 of Co, can be controlled by adjusting the in situ anodic oxidation time. Fe<sub>0.33</sub> Co<sub>0.67</sub> OOH PNSAs/CFC shows superior OER electrocatalytic performance, with a low overpotential of 266 mV at 10 mA cm<sup>-2</sup> , small Tafel slope of 30 mV dec<sup>-1</sup> , and high durability.
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