Efficient Proton-exchange Membrane Fuel Cell Performance of Atomic Fe Sites via p–d Hybridization with Al Dopants

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(18), P. 12636 - 12644

Published: April 27, 2024

Orbital hybridization to regulate the electronic structures and surface chemisorption properties of transition metals is great importance for boosting oxygen reduction reaction (ORR) in proton-exchange membrane fuel cells (PEMFCs). Herein, we developed a core–shell rambutan-like nanocarbon catalyst (FeAl-RNC) with atomically dispersed Fe–Al atom pairs from metal–organic framework (MOF) material. Experimental theoretical results demonstrate that strong p–d orbital between Al Fe an asymmetric electron distribution moderate adsorption strength intermediates, rendering enhanced intrinsic ORR activity. Additionally, structure FeAl-RNC abundant micropores macropores can enhance density active sites, stability, transport pathways PEMFC. The FeAl-RNC-based PEMFC achieves excellent activity (68.4 mA cm–2 at 0.9 V), high peak power (1.05 W cm–2), good stability only 7% current loss after 100 h 0.7 V under H2–O2 condition.

Language: Английский

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p-d Orbital Hybridization Induced by Asymmetrical FeSn Dual Atom Sites Promotes the Oxygen Reduction Reaction

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(31), P. 21357 - 21366

Published: July 25, 2024

With more flexible active sites and intermetal interaction, dual-atom catalysts (DACs) have emerged as a new frontier in various electrocatalytic reactions. Constructing typical p-d orbital hybridization between p-block d-block metal atoms may bring avenues for manipulating the electronic properties thus boosting activities. Herein, we report distinctive heteronuclear dual-metal atom catalyst with asymmetrical FeSn dual embedded on two-dimensional C2N nanosheet (FeSn–C2N), which displays excellent oxygen reduction reaction (ORR) performance half-wave potential of 0.914 V an alkaline electrolyte. Theoretical calculations further unveil powerful stannum ferrum sites, triggers electron delocalization lowers energy barrier *OH protonation, consequently enhancing ORR activity. In addition, FeSn–C2N-based Zn–air battery provides high maximum power density (265.5 mW cm–2) specific capacity (754.6 mA h g–1). Consequently, this work validates immense along perception into logical design DACs.

Language: Английский

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Introducing 3 s/p-3p orbital hybridization to stabilize and activate Ni3S4 for efficient hydroxyl ion storage

Nano Energy, Journal Year: 2025, Volume and Issue: unknown, P. 110976 - 110976

Published: April 1, 2025

Language: Английский

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Enhanced electrochromic performance of K WO3 by tailoring crystal structure and valence state

Solid State Ionics, Journal Year: 2024, Volume and Issue: 414, P. 116632 - 116632

Published: June 27, 2024

Language: Английский

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Boosted Aluminum Storage Performance by d-p Orbital Modulation in Zinc Selenide with Manganese Element Dopants

Inorganic Chemistry Frontiers, Journal Year: 2024, Volume and Issue: 11(23), P. 8535 - 8546

Published: Jan. 1, 2024

By modulating the band center, Mn-ion doping strategy enhances electronic conductivity and improves interaction with solvent groups, thereby achieving high capacity, enhanced kinetics, long-term cycling in rechargeable aluminum batteries.

Language: Английский

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