It promises an environmentally friendly energy framework of water cycle by making use of molecular hydrogen (H 2) as a clean and high-density energy carrier to meet future global energy needs 4, 5, 6, 7. These electrochemical properties make them attractive candidates as oxygen-evolution-reaction electrocatalysts in electrolysis of water for large-scale hydrogen generation.Įlectrochemical water splitting powered by renewable electricity from plentiful solar and wind resources is an attractive energy conversion technology for clean and large-scale hydrogen production 1, 2, 3, 4. At overpotential of as low as 360 mV, they reach >3900 mA cm −2 and retain exceptional stability at ~1900 mA cm −2 for >1000 h, outperforming commercial RuO 2 and some representative oxygen-evolution-reaction catalysts recently reported.
By virtue of three-dimensional nanoporous architecture to offer abundant and accessible electroactive CoFeOOH/CeO 2− xN x heterostructure interfaces through facilitating electron transfer and mass transport, nanoporous FeCo/CeO 2− xN x composite electrodes exhibit superior oxygen-evolution electrocatalysis in 1 M KOH, with ultralow Tafel slope of ~33 mV dec −1. Here we report that self-supported laminate composite electrodes composed of alternating nanoporous bimetallic iron-cobalt alloy/oxyhydroxide and cerium oxynitride (FeCo/CeO 2− xN x) heterolamellas hold great promise as highly efficient electrocatalysts for alkaline oxygen-evolution reaction. Developing robust nonprecious-metal electrocatalysts with high activity towards sluggish oxygen-evolution reaction is paramount for large-scale hydrogen production via electrochemical water splitting.
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