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A new way for synthesizing porous composite with cobalt species and N-doped carbon nanotubes (NDCNTs) was reported here by using cobalt salts and melamine mixtures as precursor. The Co(O) x /NDCNTs exhibited good activity of electrocatalytic O 2 production. Furthermore, after reduced by H 2 , the Co-NDCNTs showed strong absorption of visible light and high catalytic activity of H 2 production, which is 598.5 μmol g -1 h -1 under the visible light (λ &gt; 420 nm). The results suggested that supramolecular preorganization of melamine monomers may be a promising method of synthesizing two-dimensional N-doped carbon nanotube with Co particles in it. The morphologies should be beneficial for the charge transport and separation. This work can encourage further synthesize new efficient noble-metal-free photocatalysts or electrocatalysts.

Co(O)x Particles in Polymeric N-Doped Carbon Nanotube Applied for Photocatalytic H2 or Electrocatalytic O2 Evolution