Electrocatalytic Activity of a Composite Based on η-Niobium Carbide in Hydrogen Evolution Reaction

The electrocatalytic activity of a new composite material based on η-carbide Nb 3 (Fe, Al) 3 C in the hydrogen evolution reaction from acidic and alkaline solutions is studied. The composite was obtained by spark plasma sintering of mechanically alloyed niobium, aluminum, and graphite powders in ste...

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Bibliographic Details
Published in:Inorganic materials : applied research 2024-04, Vol.15 (2), p.432-442
Main Authors: Eryomina, M. A., Lyalina, N. V., Lomayeva, S. F., Averkiev, I. K.
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Composite materials
General Purpose Materials
Graphite
Hydrofluoric acid
Hydrogen evolution reactions
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Iron
Materials Science
Mechanical alloying
Niobium carbide
Sintering (powder metallurgy)
Spark plasma sintering
Thickness
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Summary:The electrocatalytic activity of a new composite material based on η-carbide Nb 3 (Fe, Al) 3 C in the hydrogen evolution reaction from acidic and alkaline solutions is studied. The composite was obtained by spark plasma sintering of mechanically alloyed niobium, aluminum, and graphite powders in steel containers in petroleum ether, followed by etching in an alkaline solution or in a hydrofluoric acid solution. The composite consists of 78 wt % Nb 3 (Fe, Al) 3 C, 19 wt % Nb 5 Al 3 C x , and 3 wt % graphite; it has a layered structure with a layer thickness of the Nb 5 Al 3 C x phase of 50–70 nm. In terms of the magnitudes of overpotential in the hydrogen evolution reaction, the resulting composite is superior to undoped Nb 2 CT x and Nb 4 C 3 T x .
ISSN:2075-1133
2075-115X
DOI:10.1134/S2075113324020199