One-dimensional high-defect NiO nanowires prepared by electrostatic spinning and catalytic application thereof
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A technology of nanowires and defects, which is applied in the field of preparation of high-defect NiO nanowires, and can solve problems such as the reduction of crystal surface energy
Active Publication Date: 2014-08-20
UNIV OF SCI & TECH OF CHINA
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However, the existence of surface defects (steps and knots) can reduce the surface energy of th...
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[0019] The technical solution of the present invention will be described in further detail below. It should be noted that the various embodiments of the present invention can be combined in any way as desired.
[0020] The first aspect of the present invention provides a method for preparing one-dimensional NiO nanowires, which uses nickel acetate, N-N dimethylformamide and polyvinylpyrrolidone as precursors for the reaction.
[0021] In a preferred embodiment, the preparation method comprises the steps of:
[0022] (1) Weigh a certain amount of nickel acetate (Ni(CH 3 COO) 2 4H 2 O), dissolved in a certain amount of N-N dimethylformamide (DMF), stirred for a certain period of time.
[0023] (2) Then weigh a certain amount of polyvinylpyrrolidone (PVP) and dissolve it in the solution of nickel acetate, and stir for several hours.
[0024] (3) Take the precursor solution into the syringe, move it to the syringe pump, apply a certain flow rate and voltage, and obtain Ni(CH ...
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Abstract
The invention relates to a preparation method of high-defect nanowires NiO and photocatalytic application of the NiO nanowires. The method is mainly characterized in that nickel acetate, N,N-dimethylformamide and polyvinylpyrrolidone used as precursors are subjected to a simple electrostatic spinning process to synthesize lots of one-dimensional composite nanowires on an aluminum foil. After a non-equilibrium calcination process, abundant steps, knots and other surface defects are generated on the NiO nanowire surface due to the escape of gas phases, generation of pores and holes and the like, and the surface energy is lowered, so that the high-energy surface of the NiO can be preserved, thereby greatly enhancing the catalytic efficiency. The atomic density of the exposed high-energy surface is defined and quantitatively calculated to enhance the photocatalytic efficiency in a controllable way, thereby providing the direction for the subsequent catalysis research.
Description
technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a preparation method of one-dimensional high-defect NiO nanowire and its application in photocatalysis. Background technique [0002] In recent years, due to increasingly severe energy and environmental problems, photocatalytic water splitting to produce hydrogen has become a research hotspot in recent years due to its reproducibility and cleanliness (Khaselev et al., Science, 1998, 280, 425-427; Khan et al. al., Science, 2002, 297, 2243-2245; Park et al., NanoLett, 2006, 6, 24-28; Chen et al., Chem. Rev., 2010, 110, 6503-6570). Semiconductor-based catalysts are widely used in the hydrogen production industry, but their energy conversion efficiency is low due to their inefficient catalytic redox reactions. Therefore, subcatalysts are used to reduce the activation energy and improve the reactivity of semiconductor-based catalysts, such as noble metals Ag, ...
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