Hanyang University · Engineering
Professor E. Zalnezhad's research lab specializes in the design and fabrication of advanced nanostructured materials for energy storage and conversion applications. The lab focuses on developing binder-free, three-dimensional hierarchical electrode architectures based on transition metal oxides, hydroxides, sulfides, and spinels—particularly nickel cobaltite (NiCo₂O₄)—grown directly on conductive substrates like nickel foam. Key research directions include optimizing electrode morphology for enhanced ion transport and electronic conductivity, improving cyclability and specific capacitance, and exploring novel synthesis techniques such as hydrothermal synthesis, electrodeposition, and in situ conversion methods. The lab also investigates fatigue life prediction in metallic materials, reflecting a dual focus on structural integrity and functional materials for sustainable engineering solutions.
Figures are computed from collected data and may differ slightly.
Metallic materials are extensively used in engineering structures and fatigue failure is one of the most common failure modes of metal structures. Fatigue phenomena occur when a material is subjected to fluctuating stresses and strains, which lead to failure due to damage accumulation. Different methods, including the Palmgren-Miner linear damage rule- (LDR-) based, multiaxial and variable amplitude loading, stochastic-based, energy-based, and continuum damage mechanics methods, forecast fatigue
In this study, we synthesized binder-free NiCo<sub>2</sub>O<sub>4</sub>@NiCo<sub>2</sub>O<sub>4</sub> nanostructured materials on nickel foam (NF) by combined hydrothermal and cyclic voltammetry deposition techniques followed by calcination at 350 °C to attain high-performance supercapacitors. The hierarchical porous NiCo<sub>2</sub>O<sub>4</sub>@NiCo<sub>2</sub>O<sub>4</sub> structure, facilitating faster mass transport, exhibited good cycling stability of 83.6% after 5000 cycles and outstandin
In this work, nickel cobaltite (NiCo<sub>2</sub>O<sub>4</sub>) nanosheets with a porous structure were fabricated on nickel foam as a working electrode for supercapacitor applications. The nanosheets were fabricated by electrochemical deposition of nickel-cobalt hydroxide on the nickel foam substrate at ambient temperature in a three-electrode cell followed by annealing at 300 °C to transform the coating into a porous NiCo<sub>2</sub>O<sub>4</sub> nanosheet. Field emission scanning electron micr
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