Calcium-Mediated Fe─N Bond Reinforcement for Ultra-Stable Oxygen Reduction Reaction.
basic_science · Level V
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- Record sourced from PubMed, PMID 42272231.
- Also identified by DOI 10.1002/adma.73684.
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Abstract
The practical deployment of atomically dispersed Fe-N-C catalysts for the oxygen reduction reaction (ORR) is severely hampered by the electrochemical leaching of Fe active sites. Inspired by the stabilizing role of Ca<sup>2+</sup> in metalloenzyme active sites, a novel Fe-Ca dual-atom sites catalyst (Ca/Fe-N-C) is constructed on amorphous porous carbon nanosheets. The introduced Ca atom acts as an "electronic modulator" and "structural stabilizer," which effectively lowers the oxidation state of Fe and reinforces Fe-N coordination bond. This ingenious design results in an exceptional ORR catalyst with the half-wave potential of 0.912 V in alkaline media and unprecedented durability, exhibiting negligible decay after 80000 cycles. When integrated into Zn-air batteries (ZABs), the Ca/Fe-N-C-based cathode delivers a peak power density of 215 mW cm<sup>-2</sup> and sustains operation for exceeding 1110 h, markedly superior to benchmark Pt/C. This work not only unveils the pivotal role of alkaline-earth metals in stabilizing transition-metal sites but also establishes a general paradigm for designing durable atomically dispersed catalysts for advanced energy conversion devices.