Used in electroplating to deposit a smooth and adherent layer of nickel on metals, enhancing corrosion resistance and surface hardness. Commonly employed in the preparation of catalysts for hydrogenation and other organic synthesis reactions. Serves as a precursor in the production of nickel-based batteries and electronic components. Utilized in laboratories as a source of nickel ions in analytical chemistry and biochemical assays. Also applied in textile dyeing and as a mordant to fix dyes onto fabrics. Plays a role in metal surface treatment processes to improve adhesion of coatings.