Hybrid bimetallic sulfide (FeCoS)-doped conductive polymer as efficient oxygen evolution reaction electrocatalyst for direct seawater electrolysis
Anion exchange membrane water electrolyzer; Electrolysis; FeCoS; Oxygen evolution reaction; Polyaniline; Seawater electrolysis; Transition metal sulfide
Seawater electrolysis is critical for sustainable hydrogen production, especially in regions facing freshwater scarcity. However, chloride ions compete through parasitic reactions, such as the chlorine evolution reaction, creating a serious challenge that reduces catalytic activity and durability. Herein, a hybrid electrocatalyst composed of FeCoS embedded in a polyaniline matrix (FCS-PANI) is synthesized using a simple hydrothermal method. This fabricated composite combines the benefits of the high catalytic activity of FeCoS and the corrosion resistance of the conductive polymer (PANI). Structural analysis establishes the formation of a uniform nanocomposite with strong metalsulfur and metalnitrogen interactions. Advanced oxygen evolution reaction (OER) performance with a low overpotential of 327?mV at 30?mA?cm?2 and a Tafel slope of 38.67?mV dec?1 is achieved through electrochemical testing in alkaline seawater. High stability, low degradation (0.3?mV?h?1) over 500?h of operation, and 99.97% hydrogen purity are observed upon integration into an anion exchange membrane water electrolyzer (AEMWE), indicating its practical potential for seawater electrolysis. 2026 Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
Kyaw, Aye Myint Myat; Han, Youri; Yang, Juchan; Kim, Suyeon; Wang, Hao; Manh, Tu Le; Matthew, Sobin; Li, Oi Lun
Journal of Power Sources;Volume;684;Issue;;Article No.;240423;
Restricted Access; Hardcopy may be available in the library
https://doi.org/10.1016/j.jpowsour.2026.240423 https://www.scopus.com/pages/publications/105039704338?origin=resultslist
Kyaw A.M.M., Department of Materials Science and Engineering, Pusan National University, South Korea; Han Y., Department of Materials Science and Engineering, Pusan National University, South Korea; Yang J., Hydrogen Materials Research Center, Energy & Environmental Materials Research Division, Korea Institute of Materials Science (KIMS), Changwon, 51508, South Korea; Kim S., Department of Materials Science and Engineering, Pusan National University, South Korea; Wang H., Beijing Key Laboratory of Solid State Battery and Energy Storage Process, Institute of Process Engineering Chinese Academy of Sciences, Beijing, 100190, China; Manh T.L., Faculty of Material Science and Engineering, Phenikaa University, Hanoi, Viet Nam; Matthew S., Centre for Renewable Energy and Environmental Sustainability, Christ University, Bangalore, 560 029, India; Li O.L., Department of Materials Science and Engineering, Pusan National University, South Korea, Institute of Materials Technology, Pusan National University, South Korea