Graphene/Ni-Fe layered double-hydroxide composite as highly active electrocatalyst for water oxidation

Water oxidation to produce oxygen as a means of renewable energy applications has attracted intense interest. However, the oxygen evolution reaction (OER) is still a huge challenge due to its a kinetically slow process requiring high overpotential. Therefore, the design and fabrication of highly active, durable, and cost-effective electrocatalysts are crucial. Here, we demonstrate the graphene/Ni-Fe layered double-hydroxide (RGO-Ni-Fe LDH) composite as highly active and durable electrocatalyst for OER, which exhibits excellent OER activity with a small overpotential (similar to 250 mV in 0.1 M KOH) based on the onset of catalytic current and stability. Furthermore, the electrocatalytic activity of RGO-Ni-Fe LDH composite is much better than that of others similar structures of electrocatalysts. (C) 2015 Elsevier Ltd. All rights reserved.