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    A corrosion-etching strategy for fabricating RuO2 coupled with defective NiFeZn(OH)(x) for a highly efficient hydrogen evolution reaction

    Year: 2022

    Journal: J. Mater. Chem. A, Volume 10, OCT 4, page 20453–20463

    Authors: Li, Xiaofeng; Liu, Xupo; Zhang, Cuicui; Wang, Ran; Wei, Gangya; Yang, Tianfang; Zhang, Jing; Chen, Ye; Gao, Shuyan

    Organizations: National Natural Science Foundation of China [U1804255]; Scienti.c and Technological Research Project, Henan province [222102520038, 212102210651]

    Developing cost-effective and durable hydrogen evolution reaction (HER) catalysts is imperative for electrochemical water splitting. Herein, a facile corrosion-etching strategy has been applied to synthesize RuO2 coupled with defective NiFeZn(OH)(x) on NiFe foam (NFF) at room temperature, achieving a D/NFF-Ru-Zn electrocatalyst with abundant structural defects. Benefiting from the abundant exposed defective sites and the synergistic effect between defective NiFeZn(OH)(x) and RuO2, D/NFF-Ru-Zn efficiently improves the poor intrinsic conductivity of NiFe hydroxide and reduces the kinetic energy barrier of the Volmer step, thus accelerating the HER kinetics. The prepared D/NFF-Ru-Zn catalyst demonstrates excellent activity with an overpotential of 90 mV at 100 mA cm(-2), as well as prominent durability of operating at 100 mA cm(-2) for 100 h. Furthermore, integrated with a NiFe-OH electrode, the assembled water splitting device displays a low voltage of 1.67 V at 500 mA cm(-2). Remarkably, the corrosion-etching strategy employed in this work can be extended to other substrates (e.g., Ni foam and Fe foam), providing a potential perspective for designing efficient HER electrocatalysts.
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