期刊
ADVANCED FUNCTIONAL MATERIALS
卷 33, 期 17, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202214124
关键词
nanoporous Co@CoO; RuO2; oxygen evolution reaction; tunable ligament sizes; vapor phase dealloying
Low-cost and effective Co@CoO/RuO2 composites with tunable sizes and chemical compositions were fabricated by vapor phase dealloying. The composite catalyst exhibited superior OER activity, fast reaction kinetics, and long-term stability.
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据