【摘 要】
：
Flower-like hierarchical three-dimensional NiFe layered double hydroxides hollow microspheres (3D NiFe-LDH HMS), as one kind of novel non-noble metal electrocatalysts, have been fabricated in a template-free route for water oxidation. Both of the concentr
【机 构】
：
State Key Laboratory of Chemical Resource Engineering, Beijing Engineering Center for Hierarchical C
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Flower-like hierarchical three-dimensional NiFe layered double hydroxides hollow microspheres (3D NiFe-LDH HMS), as one kind of novel non-noble metal electrocatalysts, have been fabricated in a template-free route for water oxidation. Both of the concentration of ammonium fluoride and the reaction time are adjusted to obtain a series of NiFe-LDH microspheres, with different internal structures from mas-sive to hollow generated during the hydrothermal treatment, which improve the electrocatalytic activ-ity of the NiFe-LDH catalysts towards the evolution reaction of oxygen. The optimized NiFe-LDH-0.4M HMS show the excellent OER performance in alkaline electrolyte with η = 290 mV@10 mA cm 2 , and a Tafel slope of 51 mV dec 1 , which outperforms the benchmark RuO2 catalyst. The possible reason is at-tributed to the more exposure of active sites, and fast ion transport resulting from the hierarchical hollow structure.
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