AI Article Synopsis
- The study introduces a fluorinated 2D/2D FeNi layered double hydroxide/MXene structure (F-LDH/MX) that enhances oxygen evolution reaction (OER) by utilizing lattice oxygen, which is crucial for improving efficiency.
- Fluorine enhances the self-evolution of the catalyst in alkaline conditions without needing external current, promoting the formation of active metal oxyhydroxides and increasing active oxygen vacancies that activate lattice oxygen.
- F-LDH/MX demonstrates exceptional performance with a low overpotential of 251 mV and Tafel slope of 40.28 mV dec, making it suitable for applications like water electrolyzers and Zn-air batteries, showing potential for efficient energy conversion and
Article Abstract
In oxygen evolution reaction (OER), the participation of lattice oxygen can break the limitation of adsorption evolution mechanism, but the activation of lattice oxygen remains a critical challenge. Herein, a surface fluorinated highly active 2D/2D FeNi layered double hydroxide/MXene (F-LDH/MX) is demonstrated, boosting OER with the enhanced lattice-oxygen-mediated path. The introduction of fluorine promotes the self-evolution of catalyst in an alkaline environment, even without an external current. It further accelerates the formation of active metal oxyhydroxides with abundant oxygen vacancies under the operating potential. The introduced oxygen vacancy activates the lattice oxygen, increasing the proportion of lattice oxygen mechanism in OER. Owing to the synergistic effects of the 2D/2D hierarchical structure and the modulated active surface, F-LDH/MX possesses excellent electrochemical performances, including a low overpotential of 251 mV at 10 mA cm, a low Tafel slope of 40.28 mV dec, and robust stability. The water electrolyzer system with F-LDH/MX as the anode offers the benchmark current density at a low cell voltage of 1.53 V, while the Zn-air battery with F-LDH/MX as the air electrode exhibits a higher power density of 75.43 mW cm. This study presents a promising strategy to design highly active electrocatalysts for energy conversion and storage.
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|---|---|
| http://dx.doi.org/10.1002/advs.202410812 | DOI Listing |
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11714146 | PMC |
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