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초록

The development of efficient, stable, and non-precious bifunctional electrocatalysts for overall water splitting is crucial for sustainable hydrogen production. Herein, we report the synthesis of a metal organic framework (MOF)-derived trimetallic CoFeCu catalyst anchored on a nickel-coated carbon nanotube scaffold (CoFeCu@Ni-CNT) via a facile solvothermal method. The outcome of an integrated electrocatalyst of CoFeCu@Ni-CNT exhibits exceptional activity for both the hydrogen and oxygen evolution reactions (HER and OER) in alkaline media. For the OER, it achieves a low overpotential of 220 mV at 10 mA cm-2, surpassing the performance of commercial RuO2(230 mV). For the HER, it requires an overpotential of only 49 mV, demonstrating performance approaching that of noble-metal benchmarks. Tafel analysis and electrochemical impedance spectroscopy confirm superior reaction kinetics and rapid charge transfer, attributed to the synergistic electronic modulation between Co, Fe, and Cu and the highly conductive Ni-CNT matrix. When employed in a two-electrode alkaline electrolyzer, the CoFeCu@Ni-CNT||CoFeCu@Ni-CNT configuration delivers a current density of 10 mA cm-2 at a low cell voltage of 1.51 V. Furthermore, the catalyst demonstrates outstanding long-term stability, maintaining its activity for over 24 h of continuous operation without degradation. This work provides a promising strategy for designing high-performance, durable electrocatalysts by engineering multi-metallic synergies on conductive hierarchical supports.

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