Optimizing Electron Modulation Induced by the Interfacial Coupling in Cu₃P‐Cu₂O Heterostructures to Enhance Polysulfide Conversion

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 11, 2025

Abstract Electrocatalysts can inhibit the shuttling of lithium polysulfides (LiPSs) in Li–S batteries by enabling catalytic conversion LiPSs. In this research, heterogeneous Cu 3 P‐Cu 2 O nanoparticles anchored on porous carbon network (Cu O/PC) are investigated to stimulate reaction kinetics LiPSs conversion. At heterojunction interface, high electron density measured functional theory energizes transfer, anchoring The strong interfacial coupling effect generated heterostructure endows active sites with promoted adsorption capability. improved sulfur reduction and Li S activation suppress shuttling. Remarkably, cells equipped O/PC@S cathode marked capacity 1254.3 mAh g −1 at 0.2C ultrahigh cycling stability (0.021% decay rate per cycle after 1200 cycles 4C). Considering practical applications, cathode‐based pouch cell exhibited an initial specific 1069.5 a energy 378.8 Wh kg . This work established pathway for regulating through copper‐based catalysts, exhorting design highly efficient catalysts batteries.

Language: Английский

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Improvement of Redox Kinetics of Dendrite-Free Lithium–Sulfur Battery by Bidirectional Catalysis of Cationic Dual-Active Sites

ACS Sustainable Chemistry & Engineering, Journal Year: 2023, Volume and Issue: 11(23), P. 8544 - 8555

Published: May 30, 2023

The practical application of lithium–sulfur batteries (LSBs) is hampered by the slow lithium polysulfide (LIPS) conversion kinetics and uncontrollable anode-metal dendrites. Herein, a three-dimensional cation dual-active-site eggshell structure compound (3DCS-FMO@C) was synthesized soft template, ion exchange, pyrolysis to modify commercial separator. Experimental theoretical analysis results showed that Mn2+ Fe2+ sites in 3DCS-FMO@C can synergistically adsorb LIPSs, effectively regulate bidirectional dynamics intermediate liquid-phase LIPSs solid-phase sulfide, reduce energy barrier reaction. 3DCS-FMO@C-modified separator with high mechanical stability no reduction diffusion also had lithiophilic central core homogenize lithium-ion flow, thereby inhibiting dendrite growth lithium. Based on above advantages, LSBs better electrochemical performance, including an initial capacity 1530 mAh g–1 at 0.1C ultralow decay rate 0.029% for 1000 cycles 0.5C. A area 8.7 cm–2 achieved even sulfur loading poor electrolyte. This work provided basis understanding catalysis simultaneously solved problem

Language: Английский

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Bioresponsive Self‐Reinforcing Sericin/Silk Fibroin Hydrogel for Relieving the Immune‐Related Adverse Events in Tumor Immunotherapy

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(15)

Published: Feb. 3, 2023

Abstract Despite the immense potential of immune checkpoint blockade (ICB) therapy in tumor treatment, its widespread clinical application is currently limited by unsatisfactory curative effect and off‐target adverse effect. Herein, an injectable sericin (SS)/silk fibroin (SF) recombinant hydrogel, termed SF‐SS‐SMC developed to enable local delivery anti‐CD47 antibody (α CD47). The hydrogel displays self‐reinforcement high H 2 O concentration microenvironment (TME), as SS/Fe 2+ supramolecular nanocomplex (SS‐SMC) inside converts reactive oxygen species (ROS), further triggering additional crosslinking among SF polymers. Therefore, has vivo retention time longer than 21 days acts a reservoir for long‐term sustained release α CD47. More importantly, itself efficiently regulates remodeling protumor immunosuppressive TME antitumoral through switching tumor‐associated macrophages from anti‐inflammatory M2 phenotype proinflammatory M1 without drugs. Based on combined CD47 reprogramming, satisfactory immunotherapeutic effects treatment local, abscopal, remitting, metastatic tumors. Further advantages, including low cost production, simple fabrication, ease use, make it promising commercial mass production.

Language: Английский

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Crystal transformation engineering for effective polysulfides blocking layer for excellent energy density lithium–sulfur batteries

Energy storage materials, Journal Year: 2023, Volume and Issue: 61, P. 102877 - 102877

Published: July 3, 2023

Language: Английский

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Selective Reduction of Multivariate Metal–Organic Frameworks for Advanced Electrocatalytic Cathodes in High Areal Capacity and Long-Life Lithium–Sulfur Batteries

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(2), P. 2283 - 2295

Published: Jan. 2, 2024

Lithium–sulfur batteries hold great promise as next-generation high-energy-density batteries. However, their performance has been limited by the low cycling stability and sulfur utilization. Herein, we demonstrate that a selective reduction of multivariate metal–organic framework, MTV-MOF-74 (Co, Ni, Fe), transforms framework into porous carbon decorated with bimetallic CoNi alloy Fe3O4 nanoparticles capable entrapping soluble lithium polysulfides while synergistically facilitating rapid conversion Li2S. Electrochemical studies on coin cells containing 89 wt % loading revealed reversible capacity 1439.8 mA h g–1 at 0.05 C prolonged for 1000 cycles 1 C/1060.2 decay rate 0.018% per cycle. At high areal 6.9 mg cm–2 lean electrolyte/sulfur ratio (4.5 μL:1.0 mg), battery based 89S@CoNiFe3O4/PC cathode provides 6.7 cm–2. The exhibits an outstanding power density 849 W kg–1 5 delivers specific energy 216 2 C, corresponding to 433 kg–1. Density functional theory shows observed results are due strong interaction between Fe3O4, facilitated charge transfer substrate.

Language: Английский

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