02026naa a2200301 a 450000100080000000500110000800800410001902200140006002400560007410000150013024501490014526000090029452011170030365000240142065300320144465300220147665300140149865300170151265300100152965300290153970000200156870000120158870000140160070000160161470000230163070000190165377300520167221825962025-12-10       2025    bl uuuu     u00u1 u    #d  a0378-77537 ahttps://doi.org/10.1016/j.jpowsour.2025.2381282DOI1 aMEDINA, M.  aTailoring NiFeS microstructure through electrodeposition for high-performance anion exchange membrane water electrolysis.h[electronic resource]  c2025  aAbstract: Sustainable hydrogen production from anion exchange membrane (AEM) water electrolysis is an economically efficient alternative to proton exchange membrane (PEM) technology. However, conventional ionomer-based spray-coated electrodes suffer from poor conductivity and low utilization of active sites. These are primarily due to the agglomeration of ionomers with the catalyst, leading to uneven dispersion and significant catalyst active surface area blockage. A self-supported, ionomer-free NiFeS OER catalyst, synthesized via direct electrodeposition on a nickel fiber porous transport layer, is introduced here to address these limitations. The optimized NiFeS catalyst required only 300 mV as overpotential to accomplish 100 mA cm− 2 , exhibiting superior charge transfer kinetics, as evidenced by a low Tafel slope of 84 mV dec− 1 . The catalyst also had a significantly larger electrochemically active surface area (ECSA) than its monometallic counterparts. NiFeS-based electrolyzer in a practical AEMWE setup achieved an outstanding current density of 2.6 A cm− 2 at 2.0 V, showing minimal.  aHydrogen production  aAlkaline water electrolysis  aElectrodeposition  aFe-effect  aIonomer-free  aNiFeS  aSelf-supported electrode1 aSILVA, A. B. DA1 aXIA, L.1 aJIANG, W.1 aGLÜSEN, A.1 aOLIVEIRA, C. R. de1 aMASCARO, L. H.  tJournal of Power Sourcesgv. 657, 238128, 2025.