Carbon layer-protected self-supporting CoSe2 nanowire arrays for durable hydrogen evolution reaction catalysts

Carbon layer-covered CoSe 2 nanowire arrays grown on carbon cloth (C@CoSe 2 /CC), which promote electrolyte penetration, accelerate the diffusion of H 2 bubbles and prevents CoSe 2 from acid etching, and give rise to improved HER activity and superior durability.