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- Title
Lamella-heterostructured nanoporous bimetallic iron-cobalt alloy/oxyhydroxide and cerium oxynitride electrodes as stable catalysts for oxygen evolution.
- Authors
Zeng, Shu-Pei; Shi, Hang; Dai, Tian-Yi; Liu, Yang; Wen, Zi; Han, Gao-Feng; Wang, Tong-Hui; Zhang, Wei; Lang, Xing-You; Zheng, Wei-Tao; Jiang, Qing
- Abstract
Developing robust nonprecious-metal electrocatalysts with high activity towards sluggish oxygen-evolution reaction is paramount for large-scale hydrogen production via electrochemical water splitting. Here we report that self-supported laminate composite electrodes composed of alternating nanoporous bimetallic iron-cobalt alloy/oxyhydroxide and cerium oxynitride (FeCo/CeO2−xNx) heterolamellas hold great promise as highly efficient electrocatalysts for alkaline oxygen-evolution reaction. By virtue of three-dimensional nanoporous architecture to offer abundant and accessible electroactive CoFeOOH/CeO2−xNx heterostructure interfaces through facilitating electron transfer and mass transport, nanoporous FeCo/CeO2−xNx composite electrodes exhibit superior oxygen-evolution electrocatalysis in 1 M KOH, with ultralow Tafel slope of ~33 mV dec−1. At overpotential of as low as 360 mV, they reach >3900 mA cm−2 and retain exceptional stability at ~1900 mA cm−2 for >1000 h, outperforming commercial RuO2 and some representative oxygen-evolution-reaction catalysts recently reported. These electrochemical properties make them attractive candidates as oxygen-evolution-reaction electrocatalysts in electrolysis of water for large-scale hydrogen generation. Developing stable catalysts for industrial-scale current densities is challenging. Here, the authors report self-supported laminate electrodes composed of nanoporous bimetallic iron-cobalt alloy/oxyhydroxide and cerium oxynitride hybrid that can catalyze the oxygen evolution reaction at high current densities.
- Subjects
HYDROGEN evolution reactions; IRON-cobalt alloys; CERIUM; HETEROJUNCTIONS; CATALYSTS; OXYGEN evolution reactions; LAMINATED materials; IRON alloys
- Publication
Nature Communications, 2023, Vol 14, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-023-37597-4