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In Situ Antisolvent Approach to Hydrangea-like HCo 3 O 4 -NC@CoNi-LDH Core@Shell Superstructures for Highly Efficient Water Electrolysis.

Highly active, durable, and cost-effective electrocatalysts for water oxidation are at the center of renewable energy technologies. However, the development of water oxidation catalysts with high activity at low cost remains a great challenge. Herein, an in situ antisolvent approach is reported for synthesizing ultrathin Co-Ni layered double hydroxide (CoNi-LDH) nanosheets wrapped on hollow Co3 O4 nanoparticle-embedded nitrogen-doped carbon (HCo3 O4 -NC) as a high-performance catalyst for the oxygen evolution reaction (OER). Although HCo3 O4 -NC or NiCo-LDH alone has little OER activity, their hybrid exhibits low overpotential and Tafel slope as well as high stability, due to the synergistic effect of Co3 O4 and LDH. Furthermore, the hydrangea-like HCo3 O4 -NC@NiCo-LDH core@shell composite exhibits higher catalytic activity and stability than commercial IrO2 , which makes it a high-performance nonprecious-metal-based catalyst for OER.

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