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In Situ Derived Ni x Fe 1-x OOH/NiFe/Ni x Fe 1-x OOH Nanotube Arrays from NiFe Alloys as Efficient Electrocatalysts for Oxygen Evolution.
ACS Applied Materials & Interfaces 2017 October 12
Herein, Nix Fe1-x OOH/NiFe/Nix Fe1-x OOH sandwich-structured nanotube arrays (SNTAs) supported on carbon fiber cloth (CFC) (Nix Fe1-x OOH/NiFe/Nix Fe1-x OOH SNTAs-CFC) have been developed as flexible high-performance oxygen evolution reaction (OER) catalysts by a facile in situ electrochemical oxidation of NiFe metallic alloy nanotube arrays during oxygen evolution process. Benefiting from the advantages of high conductivity, hollow nanotube array, and porous structure, Nix Fe1-x OOH/NiFe/Nix Fe1-x OOH SNTAs-CFC exhibited a low overpotential of ∼220 mV at the current density of 10 mA cm-2 and a small Tafel slope of 57 mV dec-1 in alkaline solution, both of which are smaller than those of most OER electrocatalysts. Furthermore, Nix Fe1-x OOH/NiFe/Nix Fe1-x OOH SNTAs-CFC exhibits excellent stability at 100 mA cm-2 for more than 30 h. It is believed that the present work can provide a valuable route for the design and synthesis of inexpensive and efficient OER electrocatalysts.
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