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<p>A metal–organic framework (MOF)-derived strategy was adopted to fabricate a medium-entropy material (MEM), FeCoMnZnCu@NC, realizing atomic-level dispersion of multiple metal species and the in-situ formation of N-doped carbon matrix, which collectively provided abundant and stable active sites. The FeCoMnZnCu@NC peroxymonosulfate (PMS) system achieved a 99.7% degradation rate of ciprofloxacin (CIP) (ξ) in water within 200&#xa0;s, which maintained no less than 90.0% even in various water environments. Experimental results combined with density functional theory (DFT) calculations revealed that the increased electron delocalization not only improved catalyst stability, but also created a multi-site cooperative effect under the synergistic effect of providing a rapid electron transfer hub at Co site. Moreover, selective singlet oxygen (<sup>1</sup>O<sub>2</sub>) was the dominant active species. This work not only proposed a synthesis strategy for constructing MEM but also shed new light on the internal mechanism from both micro and macro perspectives.</p>

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Cobalt Sites as Electron Transfer Hubs in Medium-entropy FeCoMnZnCu@NC: Driving Multi-site Cooperation for Efficient Singlet Oxygen Generation

  • 期刊论文

  • 发表日期：

    2026年5月8日

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  • Jia Ma,
  • Mingyao Yuan,
  • Rui Cao,
  • Na Huang,
  • Zhenxing Zeng,
  • Yanzong Zhang,
  • Shihuai Deng,
  • Xiaojing Wang

摘要

A metal–organic framework (MOF)-derived strategy was adopted to fabricate a medium-entropy material (MEM), FeCoMnZnCu@NC, realizing atomic-level dispersion of multiple metal species and the in-situ formation of N-doped carbon matrix, which collectively provided abundant and stable active sites. The FeCoMnZnCu@NC peroxymonosulfate (PMS) system achieved a 99.7% degradation rate of ciprofloxacin (CIP) (ξ) in water within 200 s, which maintained no less than 90.0% even in various water environments. Experimental results combined with density functional theory (DFT) calculations revealed that the increased electron delocalization not only improved catalyst stability, but also created a multi-site cooperative effect under the synergistic effect of providing a rapid electron transfer hub at Co site. Moreover, selective singlet oxygen (1O2) was the dominant active species. This work not only proposed a synthesis strategy for constructing MEM but also shed new light on the internal mechanism from both micro and macro perspectives.