ABSTRACT Affordable and efficient electrocatalysts are vital for sustainable water electrolysis, especially using seawater due to freshwater scarcity. This study presents a mixed‐morphology CuWO 4 /CuO heterostructure as a HER catalyst and its rGO‐blended counterpart for OER. The distinct morphologies, driven by tailored synthesis routes, enhance reaction kinetics. rGO incorporation significantly boosts OER performance through improved active site exposure and charge transfer. The catalysts exhibit low overpotentials (HER: 16 mV, OER: 179 mV at 10 mA cm −2 ) and small Tafel slopes of 34.99 mV dec −1 for HER and 60.65 mV dec −1 for OER, respectively. An assembled asymmetric electrolyzer (CuWO 4 /CuO‐rGO||CuWO 4 /CuO) achieves 10 mA cm −2 at just 1.31 V and shows excellent durability in both alkaline and natural seawater, demonstrating strong potential for cost‐effective and scalable hydrogen production.
Pal et al. (Fri,) studied this question.