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• W4306404103 endingPage "139820" @default.
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• W4306404103 abstract "A nano-composite (Fe/Fe x C@Fe-N-Cs) decorated with atomically dispersed Fe-N 4 and fine Fe/Fe x C nanoparticles (NPs) was synthesized by a novel strategy via confinement conversion of the pre-designed Fe-MIL-101@ZIF-8 dual-MOF, which shows excellent oxygen reduction reaction (ORR) performance in both alkaline and acidic media resulting from the synergistic catalytic active centers between Fe/Fe x C NPs and Fe-N 4 sites. • A dual MOF strategy is proposed to synthesize the Fe/Fe x C@Fe-N-Cs nanocomposites. • Fe/Fe x C@Fe-N-Cs displays excellent ORR performance in both alkaline and acidic media. • Zn-air battery equipped with Fe/Fe x C@Fe-N-C-900 shows a high power density of 150 mW cm -2 . • The maximum power output of Fe/Fe x C@Fe-N-Cs-equipped fuel cell is up to 560 mW cm -2 . • The electronic migration from Fe/Fe x C NPs to neighboring Fe-N 4 sites optimizes the adsorption energy of *OH during ORR. Maximizing metal utilization and increasing their activity are the main challenges to improve the oxygen reduction reaction (ORR) performance of iron and nitrogen co-doped carbons (Fe-N-Cs) catalysts. However, the activity contribution of the iron-containing nanoparticles (i.e. Fe/Fe x C NPs) inevitably formed during the preparation of Fe-N-C catalysts is often overlooked. Herein, we develop a new composite electrocatalyst (Fe/Fe x C@Fe-N-Cs) via a surfactant-assisted “MOF-on-MOF” oriented assembly and confined conversion strategy to enhance Fe utilization. The resultant Fe/Fe x C@Fe-N-C-900, featuring the combination of fine Fe/Fe x C NPs and Fe-N 4 reactive sites, achieves excellent ORR activity with half-wave potentials ( E 1/2 ) of 0.91 V and 0.81 V in both alkaline and acidic electrolytes. When using as the cathode, Fe/Fe x C@Fe-N-C-900 exhibits promising performances in Zn-air battery and H 2 -O 2 fuel cell, featuring the maximum power density of 150 mW cm -2 and 560 mW cm -2 , respectively. The electronic migration from Fe/Fe x C NPs to neighboring Fe-N 4 sites leads to moderate adsorption for reactants/intermediates on Fe atomic centers, subsequently elevating optimal ORR performance, which is revealed by density functional theory (DFT) calculations, confirming the crucial effect of Fe/Fe x C NPs in improving the activity and stability of Fe-N-Cs." @default.
• W4306404103 created "2022-10-17" @default.
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• W4306404103 date "2023-02-01" @default.
• W4306404103 modified "2023-10-02" @default.
• W4306404103 title "Dual metal-organic frameworks-derived Fe-atomic sites bounded to fine Fe/Fe C nanoparticles for enhanced oxygen electroreduction" @default.
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• W4306404103 doi "https://doi.org/10.1016/j.cej.2022.139820" @default.
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