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Article Abstract
The advancement of a bifunctional electrocatalyst consisting of Earth's rich elements and exhibiting high efficiency is the key to obtain hydrogen fuel by overall water splitting (OWS). Here, a facile and extensible hydrothermal synthesis of an electrocatalyst on iron foam (MoO/FeS/IF) as a robust bifunctional catalyst with excellent catalytic activity is designed for the hydrogen evolution reaction (HER) with an overpotential of 142 mV at 100 mA cm, and for the OER with lower overpotentials of 300 and 500 mV at 100 and 1000 mA cm. The good activity is ascribed to the controllable morphology, stronger bonding of the catalyst to a substrate and optimized electronic configuration. When used as bifunctional electrocatalysts toward alkaline overall water splitting, MoO/FeS/IF delivers a current density of 10 mA cm at a low cell voltage of 1.56 V for 110 h. Such high performance coupled with low-cost iron-based materials suggests that the present strategy may open new avenues for the rational design of electrocatalysts and for use in practical water splitting.
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