Harnessing 4f Electron Itinerancy for Integrated Dual‐Band Redox Systems Boosts Lithium‐Oxygen Batteries Electrocatalysis

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 24, 2024

In-depth comprehension and manipulation of band occupation at metal centers are crucial for facilitating effective adsorption electron transfer in lithium-oxygen battery (LOB) reactions. Rare earth elements play a unique role hybridization due to their deep orbitals strong localization 4 f electrons. Herein, we anchor single Ce atoms onto CoO, constructing highly active stable catalyst with d-f dual-band redox center. It is discovered that the itinerant behavior electrons introduces an enhanced spin-orbit coupling effect, which facilitates ideal σ/π bonding flexible between Ce/Co sites *O. Simultaneously, injection localized strengthens orbital capacity Co-O, effectively inhibits dissolution Co improves structural stability cathode material. Bracingly,

Language: Английский

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Nanocubes Comprised of Co₃O₄/CoFe₂O₄/Nitrogen-Doped Carbon for Lithium–Oxygen Batteries

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

Published: Jan. 14, 2025

Designing bifunctional catalysts that improve the efficiency of both oxygen reduction (ORR) and evolution reactions (OER) is a strategy to enhance performance lithium–oxygen batteries (LOBs). Co3O4/CoFe2O4/nitrogen-doped carbon heterostructures were synthesized as electrocatalysts using coprecipitation calcination methods. The morphology composite was characterized by hollow nanocube shape, which facilitated exposure active sites provided space for Li2O2 storage. At heterogeneous interface, electronic interactions gave rise interfacial charge redistribution. This redistribution not only improved catalytic activity but also induced generation reversible decomposition mixed LiOH discharge products. On this basis, specific capacity when used cathode catalyst 8930 mAh g–1 could be stably cycled 118 cycles, an improvement over single Co3O4 cathode.

Language: Английский

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Leveraging electron distribution reconstruction of spinel MnCo2O4 hollow microflowers for the aerobic oxidation of limonene

Applied Catalysis A General, Journal Year: 2025, Volume and Issue: unknown, P. 120331 - 120331

Published: May 1, 2025

Language: Английский

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Construction of Surface Ru_oct─O─Co_oct Units With Optimized Co_oct Spin States for Enhanced Oxygen Reduction and Evolution

Small, Journal Year: 2024, Volume and Issue: 20(47)

Published: Aug. 24, 2024

The introduction of noble metal into spinel structure is an effective strategy to develop efficient oxygen evolution/reduction reaction (OER/ORR) catalysts. Herein, surface Co

Language: Английский

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Construction of an Oxygen-Vacancy-Rich CeO₂@CoO Heterojunction toward High-Performance Lithium–Oxygen Batteries

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: April 4, 2025

Lithium-oxygen (Li-O2) batteries theoretically possess an exceptional energy density comparable to gasoline (up 3500 W h kg-1), but in practical applications, the discharge products are difficult effectively decompose, which leads clogging of cathode, resulting severe polarization, limited actual capacity, and shortened battery life for Li-O2 batteries. Herein, we construct a highly active stable catalyst with d-f electronic orbit coupling as redox center by anchoring CeO2 onto CoO, simultaneously, oxygen vacancy (Ov) coactivated CoO. By leveraging effects interface engineering defect on structure catalyst, adsorption LiO2 can be adjusted ideal range. This not only avoids surface passivation caused excessively strong binding also overcomes issue sluggish Li2O2 decomposition efficiency due weak energy. Bracingly, CeO2/CoO-based exhibit ultralow charge-discharge was successfully induced nucleate uniformly nanoflower-like shapes, could promote reversible during charging process thereby enhance electrochemical performance Therefore, CeO2@CoO/CC cathode exhibited overpotential 0.57 V achieved high capacity 19,850 mA g-1. work provides important reference designing catalysts regulating growth paths morphologies products.

Language: Английский

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Research progress and perspectives on rechargeable batteries

Chinese Chemical Letters, Journal Year: 2025, Volume and Issue: unknown, P. 111185 - 111185

Published: April 1, 2025

Language: Английский

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Precisely Engineering of Ångström‐Scale Dual Single Atom Drive [Co‐O] Spin‐Orbit Coupling to Boost Lithium–Oxygen Batteries Electrocatalysis

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 26, 2024

Abstract Dual‐atom catalysts (DACs) have emerged as a novel area of investigation in lithium–oxygen (Li‐O 2 ) batteries due to their distinctive synergistic mechanisms. However, achieving precise control the active site structure and unraveling effects bimetallic species remains significant challenge. Here, study reports pre‐encapsulated pyrolysis strategy using Co‐based Robson‐type binuclear complex precursor mediate synthesis dual single‐atom Co (Co‐DAC) with angstrom‐scale inter‐site distance configuration, serving an efficient catalyst for Li‐O batteries. The tailored induces charge redistribution, reducing crystal field splitting energy ( Δ O ). high‐spin generate strong electronic driving force, forming flexible σ δ‐like bonds crucial oxygen intermediate * O). Simultaneously, enhanced Co‐O spin‐orbit coupling facilitates electron transport along bridging O‐channel, highly Co‐O‐O‐Co chains that synergistically adsorb O, establishing favorable reaction pathway. Significant optimization redox kinetics is achieved based on well‐defined local sites. This work enhances understanding dependence between rational design custom structures corresponding transfer dynamics, while providing new strategies theoretical guidance DACs help develop high‐performance

Language: Английский

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Conductive Metal–Organic Frameworks for Rechargeable LiOH-Based Li–O₂ Batteries

ACS Applied Energy Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 3, 2024

The discharge product Li2O2 in conventional Li–O2 batteries (LOBs) is highly reactive to trigger side reactions and deteriorate the battery performance; these can be circumvented a great extent LiOH-based lithium–oxygen battery, which, however, suffers from efficient catalysis of LiOH formation decomposition. Herein, we report first introduction conductive metal–organic frameworks [conductive MOFs (cMOFs)] catalyze chemistry LOBs. Specifically, synthesized three cMOF materials based on M–HHTP (monometallic Ni–HHTP, Co–HHTP, bimetallic NiCo–HHTP, with HHTP = 2,3,6,7,10,11-hexahydroxytriphenylene). Among them, benefiting synergistic effect two metal elements, exhibits best performance catalyzing It delivers high capacity (17,845.9 mA h g–1 at current density 100 g–1), excellent rate capability (6445.9 500 reduced overpotential reactions, as well cycle stability, demonstrating potential promote development high-performance

Language: Английский

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