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Porous Co–Mo phosphide nanotubes: an efficient electrocatalyst for hydrogen evolution

Lin, Yan, Liu, Ming, Pan, Yuan, Zhang, Jun
Journal of materials science 2017 v.52 no.17 pp. 10406-10417
X-ray diffraction, X-ray photoelectron spectroscopy, catalysts, catalytic activity, durability, hydrogen production, nanorods, nanotubes, nitrogen, scanning electron microscopy, sulfuric acid, surface area, temperature, transmission electron microscopy
The construction of efficient and low-cost bimetallic phosphide catalysts for hydrogen evolution is still in challenge. In this work, a series of porous Co–Mo phosphide nanotubes which are synthesized via in situ phosphidation process of CoMoO₄ nanorods precursor at different phosphatization temperature have been used for hydrogen evolution reaction (HER). X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy, X-ray photoelectron spectroscopy and N₂ adsorption–desorption experiments were used to characterize the as-synthesized Co–Mo phosphide nanotubes. Results indicate that the phosphatization temperature is the key factor in the formation process of tube-like structure. The possible formation mechanism of Co–Mo phosphide nanotubes was further proposed. Additionally, the as-synthesized CoMoP-600 nanotubes displayed the highest HER catalytic performance and long-time durability in 0.5 M H₂SO₄ solution. The high catalytic performance of CoMoP-600 catalyst may be attributed to the favorable composition and the large surface area. This study shines a light in the application of bimetallic catalysts for the HER and provides us a new way to design and synthesize porous hollow tube-like structure materials.