Potassium selenocyanate, a white to light beige crystalline powder or needles, serves a multifaceted purpose in various chemical and industrial applications. It is instrumental in facilitating the conversion of alkyl halides to nitriles and plays a crucial role in the production of pharmaceutical intermediates. Additionally, it finds use in the field of energy storage devices by acting as a redox-active electrolyte to enhance the performance of carbon-based supercapacitors. It also serves as a starting material in the one-pot stereoselective synthesis of alkyl styryl selenides and as a precursor in synthesizing copper and nickel complexes with antioxidant and anti-inflammatory properties. Furthermore, potassium selenocyanate functions as a selenylating agent, essential for preparing stereoselective selenoglycosides and selenium-linked disaccharides.