Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 30, Issue 9, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201908367
Keywords
core-shell nanotubes; density functional theory; noble-metal-free electrocatalysts; oxygen evolution reaction; rare earth oxides
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Funding
- National Key R&D Program of China [2017YFA0208000]
- Natural Science Foundation of China [21771156]
- Early Career Scheme (ECS) fund from the Research Grant Council (RGC) in Hong Kong [PolyU 253026/16P]
- China National Funds for Excellent Young Scientists [21522106]
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Owing to the unique electronic properties, rare-earth modulations in noble-metal electrocatalysts emerge as a critical strategy for a broad range of renewable energy solutions such as water-splitting and metal-air batteries. Beyond the typical doping strategy that suffers from synthesis difficulties and concentration limitations, the innovative introduction of rare-earth is highly desired. Herein, a novel synthesis strategy is presented by introducing CeO2 support for the nickel-iron-chromium hydroxide (NFC) to boost the oxygen evolution reaction (OER) performance, which achieves an ultralow overpotential at 10 mA cm(-2) of 230.8 mV, the Tafel slope of 32.7 mV dec(-1), as well as the excellent durability in alkaline solution. Density functional theory calculations prove the established d-f electronic ladders, by the interaction between NFC and CeO2, evidently boosts the high-speed electron transfer. Meanwhile, the stable valence state in CeO2 preserves the high electronic reactivity for OER. This work demonstrates a promising approach in fabricating a nonprecious OER electrocatalyst with the facilitation of rare-earth oxides to reach both excellent activity and high stability.
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