Vapor Phase Dealloying Derived Nanoporous Co@CoO/RuO2 Composites for Efficient and Durable Oxygen Evolution Reaction (Adv. Funct. Mater. 17/2023) |
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| Authors: | Yanying Li Qiwen Zhang Xiaoran Zhao Haofei Wu Xinyao Wang Yuqiao Zeng Qing Chen Mingwei Chen Pan Liu |
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| Affiliation: | 1. State Key Laboratory of Metal Matrix Composites, Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240 P. R. China;2. Jiangsu Key Laboratory of Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing, 211189 P. R. China;3. Department of Mechanical and Aerospace Engineering, Department of Chemistry, The Energy Institute, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, 999077 Hong Kong;4. Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD, 21218 USA |
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| Abstract: | The development of low-cost and effective oxygen evolution reaction (OER) electrocatalysts to expedite the slow kinetics of water splitting is crucial for increasing the efficiency of energy conversion from electricity to hydrogen fuel. Herein, 3D bicontinuous nanoporous Co@CoO/RuO2 composites with tunable sizes and chemical compositions are fabricated by introducing vapor phase dealloying of cobalt-based alloys. The influence of physical parameters on the formation of nanoporous Co substrates with various feature ligament sizes is systematically investigated. The CoO/RuO2 shell is constructed by integrating a thin layer of RuO2 on the inner surface of nanoporous Co, where the CoO interlayer is formed by annealing oxidization. The composite catalyst delivers an ultralow overpotential of 198 mV at 10 mA cm−2, Tafel slope of 57.1 mV dec−1, and long-term stability of 50 h. The superior OER activity and fast reaction kinetics are attributed to charge transfer through the coupling of Co O Ru bonds at the interface and the excellent nanopore connectivity, while the durability originates from the highly stable CoO/RuO2 interface. |
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| Keywords: | nanoporous Co@CoO/RuO2 oxygen evolution reaction tunable ligament sizes vapor phase dealloying |
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