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Carbon nanotube encapsulated metal selenide nanostructures for efficient electrocatalytic oxygen evolution reaction.

Nickel selenide nanowires were grown inside carbon nanotubes through in situ encapsulation via one-step chemical vapor deposition. These NiSe2@CNT nanohybrids showed excellent electrocatalytic activity for water splitting with a low overpotential of 260 mV at 10 mA cm-2, high current density, and extended stability owing to the synergistic effect between NiSe2 and CNTs.