Nickel fiber felt is produced from ≥99.5% high-purity nickel fiber by non-woven laying and high-temperature sintering, with adjustable porosity of 50-80%. Large specific surface area and uniform pore distribution make it an ideal diffusion-layer material for AEM electrolyzers: the 3D interconnected pores ensure sufficient electrolyte wetting and fast gas bubble release, while the continuous metallic network provides a low-resistance electron path for efficient electrochemical reaction. Also used for alkaline battery electrodes, catalyst carriers and magnetic-material filtration.