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Cobalt Single Atom Incorporated in Ruthenium Oxide Sphere: A Robust Bifunctional Electrocatalyst for HER and OER.

The development of highly active and stable bifunctional noble-metal-based electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is a crucial goal for clean and renewable energy, which still remains challenging. Herein, we report an efficient and stable catalyst comprising Co single atom incorporated in RuO2 sphere for HER and OER, in which Co single atom in the RuO2 sphere were confirmed by XAS, AC-STEM, and DFT. This tailoring strategy uses Co single atom to modify the electronic structures of the surrounding Ru atoms and thereby remarkably elevates the electrocatalytic activities. The catalyst requires ultralow overpotentials, 45 mV for HER and 200 mV for OER, to deliver 10 mA/cm2 current density. The theoretical calculations reveal that the energy barriers for HER and OER are lowered after incorporation of cobalt single atom.