Abstract
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 O2 production. Furthermore, after reduced by H2, the Co–NDCNTs showed strong absorption of visible light and high catalytic activity of H2 production, which is 598.5 μmol g−1 h−1 under the visible light (λ > 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.
Highlights
With the development of economy, energy shortage and environmental pollution are becoming a serious problem
We report the synthesis of cobalt species and polymer N-doped carbon nanotube (Co(O)x /N-doped carbon nanotubes (NDCNTs)) composites with enhanced catalytic properties by using melamine and cobalt acetate as precursors
The external quantum efficiency (EQE) tests were performed with 300 W Xe arc lamp with a set of band-pass filters (=405 nm, 420 nm, 450 nm, 500 nm and 650 nm) under magnetic stirring, the irradiation intensities were determined by a NOVA II laser power meter (Ophir Photonics)
Summary
With the development of economy, energy shortage and environmental pollution are becoming a serious problem. One effective strategy to obtain good morphology control is the template assisted processes (for example, the porous anodic aluminum oxide was used as template), which has developed the synthetic carbon nanotubes [6,7,8]. The steps of this method are complicated and the template needs to be removed Another approach is to obtain preformed micron or nanostructures by using various types of organic supramolecular compounds as ordered precursors [9,10,11,12,13]. As far as we know, there are still very few reports of metal oxides/N-doped carbon nanocomposites with good control morphology through metal organic supramolecular framework. We develop a supramolecular arrangement method to synthesize metal (oxides) and N-doped carbon composite catalysts
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