AI Article Synopsis
- - Developing efficient catalysts for oxygen reactions is crucial for renewable energy tech like fuel cells and metal-air batteries.
- - Researchers created a new ternary-atom catalyst combining iron (Fe) and nickel (Ni) in nitrogen-doped carbon microspheres, showing better performance than those with only one type of site.
- - The catalyst works well due to the Fe-N sites being the main active centers, with enhanced activity thanks to the Ni-N sites optimizing the d-band centers, presenting a sustainable alternative to traditional platinum and ruthenium catalysts.
Article Abstract
Developing highly efficient, cost-effective, and robust electrocatalysts for the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) is paramount for the large-scale commercialization of renewable fuel cells and rechargeable metal-air batteries. Herein, a new ternary-atom catalyst that is composed of paired Fe sites and single Ni sites (as Fe-N and Ni-N) coordinated onto hollow nitrogen-doped carbon microspheres is developed. The as-synthesized catalyst exhibits remarkable activities toward both the ORR and OER in alkaline media, with superior performances to those of the control materials that contain only Fe-N or Ni-N sites. Density functional theory calculations and in situ infrared (IR) spectroscopic studies clearly reveal that the Fe-N centers are the active sites for both ORR and OER, and their electrocatalytic activities are synergistically enhanced through optimization of their d-band centers by the Ni-N sites. This ternary-atom catalyst can potentially be a promising, alternative, sustainable catalyst to commercially used Pt- and Ru-based catalysts to drive both the ORR and the OER in rechargeable zinc-air batteries and other related applications.
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| http://dx.doi.org/10.1002/anie.202421168 | DOI Listing |
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