| Title |
Self-Supported Fe-Doped NiCo Oxyhydroxide Oxygen Evolution Electrode for High-Efficiency Anion Exchange Membrane Water Electrolysis |
| Authors |
박다경(Da Kyeong Park) ; 강지원(Ji-Won Kang) ; 박종혁(Jong-Hyeok Park) ; 김지현(Jihyeon Kim) ; 박다희(Dahee Park) ; 이주영(Jooyoung Lee) ; 진송(Song Jin) ; 김양도(Yangdo Kim) ; 김치호(Chiho Kim) ; 최승목(Sung Mook Choi) |
| DOI |
https://doi.org/10.3365/KJMM.2026.64.8.760 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Anion exchange membrane water electrolysis (AEMWE); Oxygen evolution reaction (OER); Fe-modulated oxyhydroxide layer; Electrodeposited NiCo electrode |
| Abstract |
Achieving highly efficient anion exchange membrane water electrolysis (AEMWE) requires not only intrinsically active oxygen evolution reaction (OER) catalysts but also electrode architectures that enable efficient charge transport and the full utilization of active sites. Herein, we report a NiCo electrode featuring an Fe-modulated oxyhydroxide layer, fabricated via electrodeposition on Ni foam followed by a simple post-treatment process. This binder-free integrated configuration ensures strong interfacial coupling and efficient electron transport without the need for polymeric binders. Structural analysis reveal a hierarchical architecture composed of a conductive electrodeposited NiCo electrode on Ni foam and a surface-reconstructed oxyhydroxide layer. Fe is predominantly localized at the surface, where it induces an electronic redistribution between the Ni and Co centers, thereby increasing their oxidation states and forming a hydroxyl-rich environment that facilitates the adsorption and transformation of OER intermediates. As a result, the electrode exhibits a low overpotential of 287 mV at 50 mA cm-2 and a Tafel slope of 44.28 mV dec-1, along with a reduced charge transfer resistance and an enhanced electrochemically active surface area. In an AEMWE single cell, it delivers a current density of 2.6 A cm-2 at 2.0 V and maintains stability with only ~1.8% degradation over 100 h at 1 A cm-2. This work demonstrates an effective strategy for coupling catalytic activity with interfacial charge transport in practical AEMWE systems. |