Poly(styrene sulfonic acid) is widely used as a proton-conducting material in fuel cells due to its high ionic conductivity and stability. It serves as a key component in proton exchange membranes (PEMs), facilitating the efficient transfer of protons while acting as an electrolyte. In water treatment, it is employed as a dispersant and anti-scaling agent, preventing the deposition of minerals and improving system efficiency. The chemical is also utilized in the production of ion-exchange resins, which are essential for purifying and separating ions in various industrial processes. Additionally, it finds applications in coatings and adhesives, where its strong acidic properties enhance bonding and durability. In biomedical fields, it is explored for drug delivery systems due to its ability to form stable complexes with therapeutic agents.