Abstract Click to copy section linkSection link copied! Designing hydrogel electrolytes that simultaneously enhance Zn2+ transport and mitigate parasitic reactions remains an important challenge for durable aqueous zinc-ion batteries (ZIBs). Here, a semi-interpenetrating polymer network (SIPN) hydrogel electrolyte composed of polyacrylamide (PAM), sodium alginate (SA), and polyethylene glycol diacid (PEGDA) is developed to regulate interfacial Zn deposition and ion transport.