Self‐Assembled 3D N/P/S‐Tridoped Carbon Nanoflower with Highly Branched Carbon Nanotubes as Efficient Bifunctional Oxygen Electrocatalyst Toward High‐Performance Rechargeable Zn‐Air Batteries

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 34(16)

Published: Dec. 28, 2023

Abstract Heteroatom doping and 3D nanostructures with large specific surface area hierarchical porous structure can synergically improve oxygen reduction reaction (ORR) evolution (OER). In this study, the N/P/S‐tridoped nanoflower highly branched carbon nanotubes bifunctional catalyst (Co/SP‐NC) is prepared by a simple self‐assembly pyrolysis method. The powerful driving force of coordination interaction ammonium ion promote 2D ZnCo‐ZIF nanosheets into ZnCo/S‐ZIF nanoflowers at room temperature stirring. driven sodium hypophosphite to form during process. Moreover, Density functional theory (DFT) calculations also confirm that simultaneous introduction N/P/S redistribution electron density interface. proper P‐doping not only enhances electronic conductivity substrate, but facilitates charge transfer in OER/ORR Therefore, Co/SP‐NC cathode assembled zinc‐air batteries (ZABs) have higher power (187 mW cm −2 ), larger capacity (801 mAh g Zn −1 ) excellent cycle stability compared Pt/C‐RuO 2 ZABs. This work will pave way regulate components interactions designing structures.

Language: Английский

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Application of metal-organic frameworks, covalent organic frameworks and their derivates for the metal-air batteries

Deleted Journal, Journal Year: 2023, Volume and Issue: 2, P. e9120052 - e9120052

Published: Feb. 1, 2023

Metal-organic frameworks (MOFs) and covalent organic (COFs) as the novel porous materials have merits of diverse, adjustable functionality, high porosity surface area, which great application prospects in gas storage, separation catalysis. In addition, their derivates make up for insufficient electronic conductivity chemical stability MOFs COFs, provide a new ideal accurate control material structure. Up to now, many efficient electrocatalysts been designed based on MOFs, COFs O₂ reduction/evolution reactions (ORR/OER) CO₂ (CO₂RR/CO₂ER) metal-air batteries. this review, latest development batteries is summarized, we discuss structural characteristics these corresponding mechanisms action. By comprehensively reviewing advantages, challenges hope that framework will shed more profound insights into electrocatalysis energy storage future.

Language: Английский

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3D Hierarchical MOF-Derived Defect-Rich NiFe Spinel Ferrite as a Highly Efficient Electrocatalyst for Oxygen Redox Reactions in Zinc–Air Batteries

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(9), P. 11537 - 11551

Published: Feb. 16, 2024

The strategy of defect engineering is increasingly recognized for its pivotal role in modulating the electronic structure, thereby significantly improving electrocatalytic performance materials. In this study, we present defect-enriched nickel and iron oxides as highly active cost-effective electrocatalysts, denoted Ni0.6Fe2.4O4@NC, derived from NiFe-based metal–organic frameworks (MOFs) oxygen reduction reactions (ORR) evolution (OER). XANES EXAFS confirm that crystals have a distorted structure metal vacancies. cation defect-rich Ni0.6Fe2.4O4@NC electrocatalyst exhibits exceptional ORR OER activities (ΔE = 0.68 V). Mechanistic pathways electrochemical are studied by DFT calculations. Furthermore, rechargeable zinc–air battery (RZAB) using catalyst demonstrates peak power density 187 mW cm–2 remarkable long-term cycling stability. flexible solid-state ZAB 66 cm–2. proposed structural design allows rational delocalization NiFe spinel ferrite attached to ultrathin N-doped graphitic carbon sheets order enhance site availability facilitate mass electron transport.

Language: Английский

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Research progress of Zn-air batteries suitable for extreme temperatures

Energy storage materials, Journal Year: 2024, Volume and Issue: 69, P. 103429 - 103429

Published: April 23, 2024

Language: Английский

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Earthworm‐Inspired Co/Co₃O₄/CoF₂@NSC Nanofibrous Electrocatalyst with Confined Channels for Enhanced ORR/OER Performance

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(26)

Published: Feb. 20, 2024

Abstract The rational construction of highly active and durable oxygen‐reactive electrocatalysts for oxygen reduction/evolution reaction (ORR/OER) plays a critical role in rechargeable metal‐air batteries. It is pivotal to achieve optimal utilization electrocatalytically sites valid control the high specific internal surface area. Inspiration designing can come from nature, as it full precisely manipulated efficient structures. Herein, inspired by earthworms fertilizing soil, 3D carbon nanofibrous electrocatalyst with multiple interconnected nanoconfined channels, cobalt‐based heterojunction particles enriched N, S heteroatoms (Co/Co 3 O 4 /CoF 2 @NSC confined channels) rationally designed, showing superior bifunctional electrocatalytic activity alkaline electrolyte, even outperforming that benchmark Pt/C‐RuO catalyst. This work demonstrates new method porous structural regulation, which channels within nanofibers are controllably formed spontaneous migration nanoparticles under CO atmosphere. Theoretical analysis reveals constructing Co/Co greatly adjust electron distribution, effectively lower barrier inter‐mediate reduce OER/ORR overpotential. introduces novel nature‐inspired strategy well‐designed architectures.

Language: Английский

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Structure–Activity Relationships in Oxygen Electrocatalysis

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

Published: Sept. 30, 2024

Abstract Oxygen electrocatalysis, as the pivotal circle of many green energy technologies, sets off a worldwide research boom in full swing, while its large kinetic obstacles require remarkable catalysts to break through. Here, based on summarizing reaction mechanisms and situ characterizations, structure–activity relationships oxygen electrocatalysts are emphatically overviewed, including influence geometric morphology chemical structures electrocatalytic performances. Subsequently, experimental/theoretical is combined with device applications comprehensively summarize cutting‐edge according various material categories. Finally, future challenges forecasted from perspective catalyst development applications, favoring researchers promote industrialization electrocatalysis at an early date.

Language: Английский

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Efficient Catalysis for Zinc–Air Batteries by Multiwalled Carbon Nanotubes‐Crosslinked Carbon Dodecahedra Embedded with Co–Fe Nanoparticles

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

Published: Jan. 10, 2025

Abstract The design and fabrication of nanocatalysts with high accessibility sintering resistance remain significant challenges in heterogeneous electrocatalysis. Herein, a novel catalyst is introduced that combines electronic pumping alloy crystal facet engineering. At the nanoscale, pump leverages chemical potential difference to drive electron migration from one region another, separating transferring electron‐hole pairs. This mechanism accelerates reaction kinetics improves rate. interface structure optimization enables CoFe/carbon nanotube (CNT) exhibit outstanding oxygen reduction (ORR) evolution (OER) performance. Specifically, this achieves an ORR half‐wave (E₁/₂) 0.895 V, outperforming standard Pt/C RuO₂ electrocatalysts terms both specific activity stability. It also demonstrates excellent electrochemical performance for OER, overpotential only 287 mV at current density 10 mA cm⁻ 2 . Theoretical calculations reveal carefully designed facets reduce energy barrier rate‐determining steps optimizing O₂ adsorption promoting capture process. study highlights developing cost‐effective bifunctional ORR–OER electrocatalysts, offering promising strategy advancing Zn–air battery technology.

Language: Английский

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Foam-like Porous Structured Trimetal Electrocatalysts Exhibiting Superior Performance for Overall Water Splitting and Solid–Liquid Zinc–Air Batteries

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

Published: Feb. 5, 2025

Electrocatalysts through an interconnected porous structure that are highly durable, active, and affordable for industrial scale production necessary electricity conversion storage devices with superior effectiveness. In the present study, we synthesized free-standing tri-metal oxide (FeNiCoO4) on top of incredibly foam-like (FNCO) via a simple method. The enhanced FNCO-600 showed remarkable electrocatalytic activity outstanding stability to related half-cell responses regard oxygen reduction reaction (ORR = 0.757 V), evolution (OER 230 mV), hydrogen (HER 211 mV). Additionally, looked into overall efficiency water splitting using catalyst, which exhibited exceptional longevity (70 h) impressive cell voltage (1.72 V). Furthermore, as cathode, created rechargeable solid-liquid electrolyte-based Zn-air batteries demonstrated power densities 21.8 mW cm-2 167.4 noteworthy durability. Finally, how synthesize produce free-standing, catalysts provide excellent energy conversion.

Language: Английский

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Spin‐Selective Coupling in Mott–Schottky Er₂O₃‐Co Boosts Electrocatalytic Oxygen Reduction

Small Methods, Journal Year: 2023, Volume and Issue: 7(7)

Published: April 8, 2023

Abstract Alkaline oxygen reduction reaction (ORR) is critical to electrochemical energy conversion technology, yet the rational breaking of thermodynamic inhibition for ORR through spin regulation remains a challenge. Herein, Mott–Schottky catalyst consisting Er 2 O 3 ‐Co particles uniformly implanted into carbon nanofibers (Er ‐Co/CNF) designed enhancing via spin‐selective coupling. The optimized ‐Co/CNF affords high half‐wave potential (0.835 V vs reversible hydrogen electrode, RHE) and onset (0.989 RHE ) surpassing individual Co/CNF /CNF. Theoretical calculations reveal introduction optimizes electronic structure Co Er(4f)‐O(2p)‐Co(3d) gradient orbital coupling, resulting in significantly enhanced performance. Through induced spin‐up hole 3d states endows Er‐O‐Co unit active site with coupling channel electron transition. This favors decrease gap potential‐limiting step, thus achieving theoretical limiting 0.77 ‐Co. Moreover, practicability as an air‐cathode also demonstrated Zn‐air batteries. work believed provide, new perspectives design efficient electrocatalysts by engineering rare‐earth oxides.

Language: Английский

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Dual template-induced construction of three-dimensional porous SiO2/NC/Co-CNTs heterostructure with highly dispersed active sites for efficient oxygen evolution reaction

Tungsten, Journal Year: 2023, Volume and Issue: 6(3), P. 585 - 595

Published: Dec. 6, 2023

Language: Английский

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