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Co nanoparticles were loaded on the TiO2 nanotube arrays (TNAs) using a three-step process.First,TNAs was prepared by an electrochemical anodization method.Afterward,Co3O4 nanoparticles were coated on the TNAs (Co3O4/TNAs) using a photochemical method.At last,The Co/H-TNAs was prepared via the hydrogenation process of the Co3O4/TNAs in hydrogen and argon atmosphere at 350 °C in a tubular furnace under ambient pressure.The content of Co nanoparticles loaded on the arrays was controlled by different repeated photochemical coating time.