Abstract
Electrochemical oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)are two impor-tant half-cell reactions for overall water splitting.The rational design and fabrication of efficient electro-catalysts involving nonprecious-metals and carbon matrix is highly attractive.Herein,a series of N-doped carbon nanotubes encapsulated FeNi alloy nanoparticles(FeNi@NCNTs)are synthesized via a simple py-rolysis treatment of Fe-doped Ni(OH)2 precursors under the assistance of dicyandiamine source.The re-sults reveal that the Fe/Ni ratio has an obvious influence on the morphology and phase composition of FeNi@NCNTs series,thus affecting the electrocatalytic performance.The highest electrocatalytic activity is achieved for the Fe1Ni4@NCNTs product with a Fe/Ni molar ratio of 1:4,which delivers low overpoten-tials of 278 and 279 mV for OER and HER at 10 mA cm-2 in 1.0 mol/L KOH,respectively.The intriguing electrocatalytic performance is mainly ascribed to the advantageous integration of rambutan-like hier-archically porous structure and composition optimization,significantly facilitating the fast mass/charge transfer as well as promoting the adsorption ability for intermediates.The present method may open a facile avenue for developing cost-effective,high-activity,and stable electrocatalysts for the application of overall water splitting.
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