Ni-NiO/C core-shell structure nano material electrocatalyst and preparation method thereof

Abstract

The invention relates to the technical field of catalysts, and discloses a Ni-NiO/C core-shell structure nanomaterial electrocatalyst and a preparation method thereof so as to solve the problem that an existing electrocatalyst is low in catalytic efficiency of catalytic hydrogen evolution; the preparation method comprises the following steps: (1) dissolving nickel chloride hexahydrate in distilled water to form a first solution; (2) adding aminoacetic acid and isopropanol into the first solution to form a second solution; (3) stirring the second solution to form turbid liquid, transferring the turbid liquid into a container, carrying out gradient heating reaction, and cooling to room temperature to obtain light green precipitate; (4) washing the collected light green precipitate cleanly, and performing vacuum drying to obtain a precursor; (5) preliminarily calcining the precursor in inert gas to obtain a Ni/C compound; and (6) carrying out secondary calcination on the Ni/C compound in air. The synthesis method provided by the invention has the characteristics of simple process, low energy consumption, mild conditions, good product morphology and the like, and is suitable for large-scale production and application.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a Ni-NiO / C core-shell structure nano material electrocatalyst and a preparation method thereof. Background technique [0002] Hydrogen has been extensively studied as a clean, renewable energy source as an alternative to dwindling fossil fuels. An efficient way to produce high-purity hydrogen is to electrochemically split water into hydrogen and oxygen in an electrolyzer. Water electrolysis is a sustainable and environmentally friendly method for hydrogen fuel production. Since the proton-rich environment is favorable for the adsorption of hydrogen on the catalyst surface, the acidic medium is favorable for the hydrogen evolution reaction. However, acidic conditions prohibit the use of non-platinum group metals as catalysts. In addition, the corrosive acid mist generated by the acidic electrolyte not only pollutes the produced hydrogen, but also causes severe chemical corros...

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Problems solved by technology

[0006] The present invention aims to overcome the problem of low catalytic efficiency of the existing electrocatalysts for catalyzing hydrogen evolution, and provides a Ni-NiO / C core-shell structure nanomaterial electrocatalyst and its preparation method. The product of the present invention will generate Ni-NiO when calcined in air Heterojunction, the Ni-NiO / C core-shell structure nanomaterial electrocatalyst prepared by the present invention, due to the Ni-NiO / C heterostructure composed of core / shell structure nanoparticles, is an efficient hydrogen evolution electrocatalyst, and its activity Similar to platinum; the synthesis method provided by the invention has the characteristics of simple process, less energy consumption, mild conditions and good product appearance, and is suitable for large-scale production applications

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