Conductive coating, cation‐intercalation, and oxygen vacancies co‐modified vanadium oxides as high‐rate and stable cathodes for aqueous zinc‐ion batteries

EcoMat, Год журнала: 2023, Номер 5(4)

Опубликована: Янв. 27, 2023

Abstract Layered vanadium oxides are promising cathode materials for zinc‐ion batteries (ZIBs) owing to their high capacity, but the sluggish electron/ion migration kinetics and structural collapse/dissolution severely limit Zn 2+ ‐storage performance. Herein, poly(3,4‐ethylenedioxythiophene) coated Mn ‐intercalated with rich oxygen vacancies (MnVOH@PEDOT) prepared as cathodes ZIBs. The PEDOT coating, synergistic vacancies, tailors electron conductivity, ‐intercalation enlarges interlayer spacing rapid ‐ions diffusion. In addition, pre‐intercalated act “pillars” stabilize structure, coating prevents direct contact of electrolyte inhibit its dissolution during cycling. Thus, MnVOH@PEDOT exhibits superior discharge favorable rate capability (336.0 mAh g −1 at 8 A ), satisfying cyclic durability (84.8% capacity retention over 2000 cycles). This work offers a facile design strategy achieving image

Язык: Английский

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Bimetallic Sulfides with Vacancy Modulation Exhibit Enhanced Electrochemical Performance

Advanced Functional Materials, Год журнала: 2024, Номер 34(28)

Опубликована: Март 10, 2024

Abstract Transition bimetallic sulfides show significant promise for energy‐related applications because of their plentiful active sites and synergistic redox activity. However, limited pore size low‐conductivity issues hinder application. The structure NiCo–S with rich sulfur vacancies is first predicted by density functional theory (DFT) calculations. Different vacancy concentrations are modeled DFT calculations, the results confirm that enhance conductivity electrode material more beneficial adsorption OH * species. It verified differential charge electric field formed on surface can lead to strong interfacial interactions electron aggregation, which promotes electron/ion transfer kinetics. Furthermore, nanosheets prepared carbon cloth enriched different (denoted as NiCo‐Sv‐x, x representing concentration vacancies) sulfide etching NiCo‐MOF annealing under H 2 /Ar atmosphere. NiCo‐Sv‐x electrodes obtained applied cathode supercapacitors anode oxygen evolution reaction. Through combining experimental theoretical analysis, effect defect engineering electrochemical performance materials further confirmed.

Язык: Английский

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Ternary Metal Sulfides as Electrode Materials for Na/K‐Ion Batteries and Electrochemical Supercapacitor: Advances/Challenges and Prospects

Advanced Energy Materials, Год журнала: 2024, Номер unknown

Опубликована: Июнь 14, 2024

Abstract Ternary metal sulfides (TMSs) have garnered significant attention as alternative electrode materials for rechargeable metal‐ion battery anodes and electrodes electrochemical supercapacitors (SCs). With the escalating costs of lithium, research has shifted toward sources like sodium‐ion batteries (NIBs) potassium‐ion (KIBs), offering cost‐effectiveness greater natural abundance globally. However, pursuing suitable beyond lithium‐ion (LIBs), such NIBs, KIBs, SCs with enhanced energy power density, remains a formidable challenge. In this context, TMSs demonstrate remarkable reversibility NIB, KIB, SC materials, showcasing multi‐electron redox reactions, improved electronic conductivity, higher theoretical capacities. Numerous articles highlighted promising future conversion storage (EECS). Nonetheless, practical applications are hindered by limitations, including structural stability during long‐standing cyclability, scalability. This review systematically demonstrates how varying synthesis routes can tailor nanostructures their influence on activity. Additionally, an in‐depth literature survey is provided performances in summarize recent advancements best available literature. Moreover, prospects challenges highlighted, expressing optimism that will emerge pivotal EECS.

Язык: Английский

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Recent advances and latest technologies in energy storage applications based on 2D MXene

Journal of Energy Storage, Год журнала: 2024, Номер 80, С. 110335 - 110335

Опубликована: Янв. 5, 2024

Язык: Английский

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Defect-Engineered NiCo-S Composite as a Bifunctional Electrode for High-Performance Supercapacitor and Electrocatalysis

ACS Applied Materials & Interfaces, Год журнала: 2021, Номер 13(40), С. 47717 - 47727

Опубликована: Окт. 3, 2021

Defect engineering is a reasonable solution to improve the surface properties and electronic structure of nanomaterials. However, how introduce dual defects into nanomaterials by simple way still facing challenge. Herein, we propose facile two-step solvothermal method Fe dopants S vacancies metal–organic framework-derived bimetallic nickel cobalt sulfide composites (NiCo-S). The as-prepared Fe-doped NiCo-S (Fe-NiCo-S) possesses improved charge storage kinetics activities as electrode material for supercapacitors oxygen evolution reaction (OER). obtained Fe-NiCo-S nanosheet has high specific capacitance (2779.6 F g–1 at 1 A g–1) excellent rate performance (1627.2 10 g–1). hybrid supercapacitor device made positive reduced graphene oxide (rGO) negative presents energy density 56.0 Wh kg–1 power 847.1 W cycling stability (capacity retention 96.5% after 10,000 cycles Additionally, composite modified doping vacancy an ultralow overpotential 247 mV mA cm–2. Based on functional theory (DFT) calculation, cause more electrons appear near Fermi level, which conducive electron transfer in electrochemical processes. Our work provides rational strategy facilely introducing metal sulfides may provide novel idea prepare materials conversion application.

Язык: Английский

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Oxygen-Defect Enhanced Anion Adsorption Energy Toward Super-Rate and Durable Cathode for Ni–Zn Batteries

Nano-Micro Letters, Год журнала: 2021, Номер 13(1)

Опубликована: Авг. 5, 2021

Abstract The alkaline zinc-based batteries with high energy density are becoming a research hotspot. However, the poor cycle stability and low-rate performance limit their wide application. Herein, ultra-thin CoNiO 2 nanosheet rich oxygen defects anchored on vertically arranged Ni nanotube arrays (O d -CNO@Ni NTs) is used as positive material for rechargeable Ni–Zn batteries. As highly uniform provide fast electron/ion transport path abundant active sites, O NTs electrode delivers excellent capacity (432.7 mAh g −1 ) rate capability (218.3 at 60 A ). Moreover, our NTs//Zn battery capable of an ultra-long lifespan (93.0% initial after 5000 cycles), extremely 547.5 Wh kg power 92.9 kW (based mass cathode substance). Meanwhile, theoretical calculations reveal that can enhance interaction between surface electrolyte ions, contributing to higher capacity. This work opens reasonable idea development ultra-durable, ultra-fast, high-energy battery."Image missing"

Язык: Английский

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A Ni–Co sulfide nanosheet/carbon nanotube hybrid film for high-energy and high-power flexible supercapacitors

Carbon, Год журнала: 2021, Номер 178, С. 355 - 362

Опубликована: Март 17, 2021

Язык: Английский

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Wire spherical-shaped Co-MOF electrode materials for high-performance all-solid-state flexible asymmetric supercapacitor device

Journal of Alloys and Compounds, Год журнала: 2021, Номер 879, С. 160423 - 160423

Опубликована: Май 19, 2021

Язык: Английский

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High-performance supercapacitor based on highly active P-doped one-dimension/two-dimension hierarchical NiCo2O4/NiMoO4 for efficient energy storage

Journal of Colloid and Interface Science, Год журнала: 2021, Номер 601, С. 793 - 802

Опубликована: Май 18, 2021

Язык: Английский

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Advances in materials and structures of supercapacitors

Ionics, Год журнала: 2021, Номер 28(2), С. 515 - 531

Опубликована: Ноя. 3, 2021

Язык: Английский

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