A niv-ldh/nf hydrogen-producing electrode with optimized electronic structure and its preparation method and application

Abstract

The invention discloses an NiV-LDH-NF hydrogen production electrode with an optimized electronic structure, and a preparation method and application of the NiV-LDH-NF hydrogen production electrode. The preparation method comprises the specific steps of (1) pretreating foamed nickel; (2) taking and mixing a vanadium source and an alkali source uniformly, then after adding polyvinyl alcohol, pouringthe mixture into 30-35 mL of ultra-pure water, and stirring uniformly to obtain a solution A; and (3) soaking the foamed nickel processed in the step (1) in the solution A, then pouring the mixture into an inner kettle to conduct a hydrothermal reaction, taking out the product foamed nickel after the reaction, and washing and drying to obtain the in-situ synthesized NiV-LDH hydrogen generation electrode. According to the NiV-LDH-NF hydrogen production electrode with the optimized electronic structure, and the preparation method and application of the NiV-LDH-NF hydrogen production electrode,a one-step hydrothermal method is adopted, the advantages of the simple reaction process, the low synthesis temperature, and no need of large equipment and harsh conditions are achieved, the foamed nickel acts as a template, also provides the nickel source and creates a reductive environment, NiV-LDH / NF containing only V<3+> and V<4+> is prepared, a synthesis path is simple, a pure phase materialis easy to obtain, and an integrated structure facilitates electronic transmission between a substrate and catalytic active substances, and can further enhance the mechanical stability of the electrode.

Description

Technical field [0001] The invention belongs to the field of electrocatalytic materials, and relates to a NiV-LDH / NF hydrogen-producing electrode with optimized electronic structure, and a preparation method and application thereof. Background technique [0002] The energy crisis has promoted the development of clean, renewable and high energy density fuels such as hydrogen. Among various hydrogen production strategies, electrochemical water splitting is currently recognized as a low-cost and high-efficiency method for converting electrical energy into clean hydrogen energy. People are also urgently seeking efficient catalysts to accelerate electrochemical hydrogen evolution. Reaction (HER). So far, the main hydrogen production catalyst is Pt / C, but its high cost and scarcity of resources have severely hindered its practical application. [0003] For this reason, the development of efficient non-noble metal hydrogen production electrocatalysts has become increasingly urgent. Lay...

AI Technical Summary

Problems solved by technology

Although most LDH electrocatalysts have high OER catalytic activity in alkaline solution, they react very slowly in HER, not to mention the hydrogen production performance under alkaline and neutral conditions.

For general NiV-LDH, the valence state of vanadium often has +3, +4, +5 at the same time, it is difficult to synthesize NiV-LDH with perfect electronic structure

For this reason, it is very necessary to develop highly active and stable NiV-LDH electrocatalysts for hydrogen production, and it is also a big challenge.

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