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Boosting Overall Water Splitting via FeOOH Nanoflakes Decorated PrBa0.5Sr0.5Co2O5+δ Nanorods.

The development of efficient, robust and low-cost catalyst for water electrolysis is critically important for renewable energy conversion. Herein, we fulfil a significant improvement on electrocatalytic activity for both oxygen-evolution reaction (OER) and hydrogen-evolution reaction (HER) by constructing a novel hierarchical PrBa0.5Sr0.5Co2O5+δ (PBSC)@FeOOH hybrid catalyst. The optimized PBSC@FeOOH-20 catalyst consisted of layered perovskite PBSC nanorods and 20 nm thick amorphous FeOOH nanoflakes exhibits an excellent electrocatalytic activity for OER and HER in 0.1 M KOH media, delivering a current density of 10 mA cm-2 at overpotentials of 390 mV for OER and 280 mV for HER, respectively. The substantially enhanced performance is probably attributed to the hierarchical nanostructure, the good charger transfer capability and the strong electronic interactions of FeOOH and PBSC. Importantly, an alkaline electrolyzer integrated PBSC@FeOOH-20 catalyst as both anode and cathode shows a highly active overall water splitting with a low voltage of 1.638 V at 10 mA cm-2 and high stability during continuous operation. This study provides new insights into exploring efficient bifunctional catalysts for overall water splitting, and it suggests that the rational design of oxyhydroxide/perovskite heterostructure shows great potential as a promising type of electrocatalysts.

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