Nickel or nickel alloy porous material with directional holes, preparation method thereof and application thereof in a hydrogen evolution electrode

Abstract

The invention discloses a nickel or nickel alloy porous material with directional holes, a preparation method thereof and application thereof in a hydrogen evolution electrode. The method comprises the steps that water-based nickel or mixed slurry containing nickel and alloy element powder is injected into a mold, the water-based slurry is directionally solidified and formed through a freezing temperature field, an obtained cold blank is frozen and dried to remove ice crystals, then a binder is removed in a hydrogen atmosphere, and the nickel or nickel alloy porous material is prepared throughhigh-temperature sintering. Preparation of nickel-based alloys with different components can be achieved by controlling the powder components in the slurry, and the porosity, the hole diameter and the microstructure of the alloys can be finely adjusted and controlled through the solid phase content and the freezing condition. The nickel or nickel alloy porous material has the advantages that theprocess is simple, the raw material source is wide, and the nickel-based alloy porous material with the different components and high porosity and high air permeability can be prepared. The prepared porous material is beneficial to release of hydrogen in the water electrolysis process, the hydrogen evolution overpotential can be reduced, the electrolysis efficiency can be improved, and the nickelor nickel alloy porous material has application potential in the field of water electrolysis hydrogen evolution.

Description

technical field

[0001] The invention belongs to the technical field of porous metal material preparation, and in particular relates to a nickel or nickel alloy porous material with oriented pores, a preparation method thereof and an application in a hydrogen evolution electrode. Background technique

[0002] At present, due to the excessive development and use of traditional fossil fuels such as coal, oil, and natural gas, global environmental pollution and energy crises have been triggered. In comparison, the energy density of hydrogen (140MJ / kg) is more than twice that of ordinary solid fuels (50MJ / kg), and the combustion product is water. It is considered to be an ideal energy source to replace fossil fuels and solve energy and environmental crises. one. At present, the world produces about 4 billion tons of hydrogen per year, of which 95% comes from the hydrocarbon steam reforming process. High cost and low purity. In recent years, the use of clean energy such as sunl...

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