Synergistic Effect of Bimetallic MOF Modified Separator for Long Cycle Life Lithium‐Sulfur Batteries

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 14(3)

Published: Nov. 21, 2023

Abstract Severe polysulfide dissolution and shuttling are the main challenges that plague long cycle life capacity retention of lithium‐sulfur (Li‐S) batteries. To address these challenges, efficient separators designed modified with a dual functional bimetallic metal‐organic framework (MOF). Flower‐shaped MOFs (i.e., Fe‐ZIF‐8) nanostructured pores synthesized at 35 °C in water by introducing dopant metal sites (Fe), which then coated on polypropylene (PP) separator to provide selective channels, thereby effectively inhibiting migration lithium polysulfides while allowing homogeneous transport Li‐ions. The active Fe‐ZIF‐8 enable electrocatalytic conversion, facilitating conversion polysulfides. Moreover, developed can prevent dendrite formation due uniform pore size hence even Li‐ion deposition. A coin cell using Fe‐ZIF‐8/PP S‐loaded carbon cathode displayed high 1000 cycles initial discharge 863 mAh g −1 0.5 C 746 rate 3 C. Promising specific has been documented under sulfur loading 5.0 mg cm −2 electrolyte ratio (E/S) 5 µL .

Language: Английский

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The Origin of Strain Effects on Sulfur Redox Electrocatalyst for Lithium Sulfur Batteries

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 14(5)

Published: Dec. 8, 2023

Abstract Introducing strain is considered an effective strategy to enhance the catalytic activity of host material in lithium‐sulfur batteries (LSB). However, introduction through chemical methods often inevitably leads changes composition and phase structure, making it difficult truly reveal essence root cause enhancement. In this paper, into MoS 2 introduced a simple heat treatment quenching. Experimental research theoretical analysis show that raises parts antibonding orbitals Mo─S bonds above Fermi level weakens Li─S S─S bonds, resulting tight anchoring accelerating conversion for lithium polysulfides (LiPSs). The cells based on with high delivers initial discharge specific capacity as 1265 mAh g −1 under 0.2 C low average fading 0.041% per cycle during 1500 cycles 1 C. This work deeply reveals origin effects reaction process LSB, providing important design principles references rational high‐performance materials future.

Language: Английский

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Enhanced Electron Delocalization within Coherent Nano‐Heterocrystal Ensembles for Optimizing Polysulfide Conversion in High‐Energy‐Density Li‐S Batteries

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(13)

Published: Dec. 25, 2023

Abstract Commercialization of high energy density Lithium‐Sulfur (Li‐S) batteries is impeded by challenges such as polysulfide shuttling, sluggish reaction kinetics, and limited Li + transport. Herein, a jigsaw‐inspired catalyst design strategy that involves in situ assembly coherent nano‐heterocrystal ensembles (CNEs) to stabilize high‐activity crystal facets, enhance electron delocalization, reduce associated barriers proposed. On the surface, stabilized facets induce aggregation. Simultaneously, surrounded surface with enhanced activity promote 2 S deposition diffusion, synergistically facilitating continuous efficient sulfur redox. Experimental DFT computations results reveal dual‐component hetero‐facet alters coordination Nb atoms, enabling redistribution 3D orbital electrons at center promoting d‐p hybridization sulfur. The CNE, based on level gradient lattice matching, endows maximum transfer catalysts establishes smooth pathways for ion diffusion. Encouragingly, NbN‐NbC‐based pouch battery delivers Weight 357 Wh kg −1 , thereby demonstrating practical application value CNEs. This work unveils novel paradigm designing high‐performance catalysts, which has potential shape future research electrocatalysts storage applications.

Language: Английский

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Regulate transportation of ions and polysulfides in all–solid-state Li-S batteries using ordered-MOF composite solid electrolyte

Science Advances, Journal Year: 2024, Volume and Issue: 10(11)

Published: March 13, 2024

A dilemma arises when striving to balance the maximum desired ion conductivity and minimize undesired lithium polysulfide shuttling effect for all-solid-state lithium-sulfur batteries (ASSLSBs). Here, we introduce a strategy of using ordered MIL-125-NH

Language: Английский

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Fast‐Charging Zinc‐Air Batteries with Stable Bifunctional Oxygen Electrocatalysis of Mo‐Induced Nanodefective Mo─Co/N─C Catalyst

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(23)

Published: Feb. 9, 2024

Abstract Fast‐charging technology plays a pivotal role in propelling the commercialization of zinc‐air batteries (ZABs). While lifetime ZABs under fast‐charging is severely shortened by abundant O 2 bubbles and deactivation cathode catalysts. Herein, defective Mo─Co / N─C electrocatalyst presented with Co nanoparticles molybdenum‐oxo subnano clusters pyrolyzing Lindqvist polyoxometalate incorporated ZIF‐67 precursor. The crystalline defects are exacerbated doping into pores ZIF‐67. Furthermore, accessibility pore increased Mo‐leaching during pre‐activation. These accessible effectively prevent exfoliation catalysts from support attack bubbles, improve electrolyte penetration. Besides, offer numerous active sites for electrocatalytic reactions, resulting an stable catalyst. Hence, such achieves long 1538 h at 5 mA cm −2 , 641 fast charge 50 homemade ZAB. unique components operational mechanisms propel scientists to portray splendid blueprints durable potential industrial applications.

Language: Английский

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Superstructured Carbon with Enhanced Kinetics for Zinc‐Air Battery and Self‐Powered Overall Water Splitting

Small, Journal Year: 2024, Volume and Issue: 20(24)

Published: Jan. 6, 2024

Abstract The present study proposes a novel engineering concept for the customization of functionality and construction superstructure to fabricate 2D monolayered N‐doped carbon electrocatalysts decorated with Co single atoms or 2 P nanoparticles derived from bimetallic ZnCo‐ZIF precursors. hierarchically porous maximizes exposure accessible active sites, enhances electron/mass transport efficiency, accelerates reaction kinetics simultaneously. Consequently, embedded (Co‐NCS) exhibits remarkable catalytic activity toward oxygen reduction reaction, achieving half‐wave potential 0.886 V versus RHE. Additionally, (Co P‐NCS) demonstrates high both evolution hydrogen delivering low overpotentials 292 mV at 10 mA cm −2 193 respectively. Impressively, when employed in an assembled rechargeable Zn‐air battery, as‐prepared exhibit exceptional performance peak power density 219 mW minimal charge/discharge voltage gap only 1.16 100 . Moreover, cell required drive overall water‐splitting electrolyzer current is merely 1.69 using these catalysts as electrodes.

Language: Английский

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Activation of MOF Catalysts with Low Steric Hindrance via Undercoordination Chemistry for Efficient Polysulfide Conversion in Lithium–Sulfur Battery

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

Published: July 3, 2024

Abstract Lithium–sulfur (Li–S) batteries promise high theoretical energy density and cost‐effectiveness but grapple with challenges like the polysulfide shuttle effect sluggish kinetics. Metal–organic framework (MOF) catalysts emerge as a leading solution, despite limited conductivity steric hindrance. This study employs undercoordination chemistry to modify Zn–Co bimetallic MOFs (D‐ZIF L), removing organic ligands from active centers. process mitigates spatial hindrance, thereby promoting comprehensive contact between sulfur species metal centers, consequently enhancing catalytic efficiency of MOFs. Moreover, treatment centers induces electron redistribution, augmenting at Fermi level elements, ameliorating intrinsic conductivity. Leveraging these advantages, fabricated Li–S employing D‐ZIF L exhibited markedly mitigated shuttling effects accelerated conversion Notably, substantial reverse areal capacity 5.0 mAh cm⁻ 2 is achieved after 100 cycles an evaluated loading 5.5 mg . Furthermore, practical pouch cell demonstrated initial 1.8 Ah 85.8 mA stable cycling for 50 cycles. underscores potential in development highly conductive MOF minimized advancing prospects battery technology.

Language: Английский

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Co single-atom catalyst on ordered macro–microporous structure as separator for Li-S battery

Journal of Colloid and Interface Science, Journal Year: 2025, Volume and Issue: 684, P. 189 - 196

Published: Jan. 11, 2025

Language: Английский

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MoC_x/CoP Janus Structure Embedded Carbon Frame for Boosting Hydrazine Oxidation and Hydrogen Evolution Reactions

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

Published: Feb. 3, 2025

Abstract The integration of hydrazine electrooxidation (HzOR) and hydrogen evolution reaction (HER) presents an efficient pathway for high‐purity production. However, developing bifunctional catalysts remains challenging the demands multiple active‐centers tailored electronic properties. Here, a unique Janus nano‐catalysts MoC x /CoP embedded on carbon frameworks (MoC /CoP@C) is introduced, featuring dual states (depletion accumulation)driven by charge redistribution within /CoP, acting as active‐sites (DAS) both HER HzOR. Theoretical analysis reveals these independent DAS in significantly enhance catalytic activity Specifically, accumulated electrons at interfaces weaken bonding strength N‐H N 2 H 4 , thereby decreasing dehydrogenation energy barrier while electronic‐deficient Mo sites accelerate * desorption, thus promoting kinetics. This catalyst exhibits ultra‐low potential −73 mV 10 mA cm −2 anodic HzOR, comparable to noble low overpotential 95 cathodic HER. When employed overall splitting (OHzS) system, /CoP@C shows promising commercial potential, with consumption (0.16 V), high Faradaic efficiency (95.4%) long‐term stability. study underscores feasibility designing elucidates mechanistic origins activities.

Language: Английский

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V‐Doping Strategy Induces the Construction of the Functionally Complementary Ru₂P/V‐RuP₄ Heterostructures to Achieve Amperometric Current Density for HER

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(28)

Published: March 13, 2024

Abstract It is a great challenge to induce the formation of RuP 4 phase and realize construction metal‐rich phase/phosphorus‐rich phase‐ruthenium phosphide heterostructure by directional regulation proportion P metal atoms. The ultra‐high conductivity Ru 2 excellent ability V‐doped absorb/desorb H* are confirmed density functional theory (DFT) calculations, which laid theoretical foundation for unique P/V‐RuP structure accelerate HER reaction kinetics. This work innovatively uses V‐doping strategy with high intrinsic activity, finally construct V‐Ru x y nanosheets rich Ru/Ru heterostructures. Thanks optimization V dopants, catalyst only needs 180 mV obtain an industrial‐grade current 1 A cm −2 . In summary, this provides new idea design performance ruthenium‐based catalysts.

Language: Английский

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