Preparation and application of ruthenium dioxide nanorod material

Through microporous membrane-assisted heterophase deposition method, a mixed solution of ammonium metatungstate and hydrated ruthenium trichloride is used to generate ruthenium hydroxide precipitate under ultrasonic conditions, which solves the inadequate utilization of ruthenium precursors and the difficulty in amplifying the yield in the prior art. In the problem, ruthenium dioxide nanorods with small size and uniform particle size were prepared to improve the catalytic efficiency of hydroxide fuel cells.

CN115974181BActive Publication Date: 2025-01-14ZHEJIANG UNIV OF TECH
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Patent Information

Application Number
CN202211721782.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-12-30
Publication Date
2025-01-14
Estimated Expiration
2042-12-30

AI Technical Summary

Technical Problem

The prior art encounters the difficulty of the ruthenium dioxide precursor in the preparation of ruthenium dioxide nanorods that cannot be fully utilized and the yield is not easy to amplify, and there is a lack of a microporous membrane-assisted heterophasic deposition self-growth strategy.

Method used

Microporous membrane-assisted heterophase deposition method is adopted to sonicate the mixture of ammonium metatungstate and hydrated ruthenium trichloride in a microporous membrane syringe, and potassium hydroxide reacts with ethanol to generate ruthenium hydroxide precipitation to avoid agglomeration. And through a multi-step process including oxidation, carbonization and secondary oxidation, a ruthenium dioxide nanorod with fine size and uniform particle size is obtained.

Benefits of technology

It realizes efficient preparation of nanorods, avoids material agglomeration, improves dispersion effect and catalytic activity, and is suitable for electrocatalyst applications in hydroxide fuel cells.

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Abstract

The present invention discloses a preparation method and application of a ruthenium dioxide nanorod material. The preparation method comprises the following steps: (1) preparing a mixed solution of ammonium metatungstate and hydrated ruthenium trichloride; (2) injecting the mixed solution into an ethanol solution of potassium hydroxide in ultrasound using a microporous membrane syringe to obtain a solid precipitate; (3) rinsing the solid precipitate with ethanol to remove excess potassium hydroxide, separating and drying, and then performing high-temperature oxidation to obtain a tungsten oxide / ruthenium dioxide powder material; (4) adding the tungsten oxide / ruthenium dioxide powder material to deionized water for rinsing, separating and drying, and then performing high-temperature carbonization, and then performing secondary high-temperature oxidation to obtain a ruthenium dioxide nanorod material. The preparation method of the present invention has simple process operation and can effectively prevent nanoparticles from agglomerating. The present invention provides the application of the prepared ruthenium dioxide nanorod material as an electrocatalyst in a hydrogen-oxygen fuel cell, which can significantly improve the catalytic conversion efficiency.
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Citation Information

Patent Citations

  • Ruthenium dioxide-based composite nano-material and preparation method thereof

    CN104124071A

  • Preparation method and application of nitrogen-doped carbon nanotube-ruthenium dioxide composite material

    CN108654604A