Efficient trifunctional electrocatalysts with iron single atoms electronically coupled with adjacent ruthenium nanoclusters for zinc-air battery-powered water splitting

Applied Catalysis B Environment and Energy, Journal Year: 2025, Volume and Issue: 368, P. 125127 - 125127

Published: Feb. 4, 2025

Language: Английский

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Asymmetry Spin‐Orbit of Single Iron Active Site Enhance Oxygen Reduction Reaction

Small, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 25, 2025

Abstract Asymmetric electron distribution of single‐atom catalysts (SAC) is an important means regulating intrinsic catalytic activity. However, limited by synthetic preparation methods, understanding the mechanism asymmetrically coordinated catalysis restricted. In this study, leveraging micropore confinement effect, nitrogen and phosphorus‐doped microporous carbon used as a substrate to successfully anchor singly dispersed Fe atoms, constructing site with N P atoms (Fe‐SAs/NPC). The existence Fe‐N 3 1 structure breaks symmetry 4 in Fe‐SAs/NC, which would optimize adsorption strength intermediates. resulting Fe‐SAs/NPC exhibits excellent ORR activity half‐wave potential 0.91 V (0.1 m KOH), 40 mV higher than that Fe‐SAs/NC (0.87 V). Combined theoretical calculations, in‐depth asymmetric electronic configuration from perspective spin orbitals can enhance near Fermi level strengthen oxygen‐containing This work provides new perspectives ideas for spin‐electronic behavior processes. Furthermore, Zn‐air battery constructed using high power density 187.7 mW cm −2 specific capacity 819.6 mAh g Zn −1 at 10 mA .

Language: Английский

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Electron Donor–Acceptor Activated Anti-Fenton Property for the Ultradurable Oxygen Reduction Reaction

ACS Nano, Journal Year: 2025, Volume and Issue: unknown

Published: March 17, 2025

Iron–nitrogen–carbon (Fe–N–C) materials are recognized as an effective category of catalysts that do not contain platinum (Pt) for the oxygen reduction reaction (ORR). Nonetheless, long-term stability and effectiveness these significantly hindered by dissolution oxidation Fe atoms. Microstructural engineering Fe–N–C is a viable approach to enhancing ORR activity stability. Herein, CuN5-single-atom nanozymes (SAzyme)-assisted Fe–N5 (SA–Fe–N5) were developed introducing single-atom Cu enhance catalyst performance. Electrochemical assessments indicated SA–Fe–N5 exhibited excellent in alkaline solutions, with half-wave potential diffusion-limited current density similar commercial Pt/C. Calculations based on functional theory single copper atom can function electron donor, at iron sites. This modification improves adsorption desorption energies intermediates involved process, ultimately boosting performance catalyst. Moreover, introduction site be regarded catalase nanozyme (CAT-SAzyme), facilitating decomposition byproduct H2O2 H2O thereby anti-Fenton during process. Notably, cathode zinc-air battery, demonstrated impressive power 217.8 mW cm–2 alongside 257.3 mA cm–2.

Language: Английский

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NiN4/FeN4 dual sites engineered by Fe5 clusters on porous flexible carbon fibers for promoting oxygen reduction and evolution

Journal of Colloid and Interface Science, Journal Year: 2025, Volume and Issue: 693, P. 137620 - 137620

Published: April 16, 2025

Language: Английский

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