Enhanced Active Sites and Stability in Nano‐MOFs for Electrochemical Energy Storage through Dual Regulation by Tannic Acid

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(41)

Опубликована: Авг. 21, 2023

The limited active sites and poor acid-alkaline solution stability of metal-organic frameworks (MOFs), significantly limit their wider application. In this study, the acid property tannic (TA) was used as an etchant to etch surface-active sites. Subsequently, further chelation protonated TA with exposed metal site can effectively protect ions. Meanwhile, provided a large amount phenolic hydroxyl groups, which greatly improve imidazolate-coordinated MOFs. electrochemical test results indicated that MOFs composite materials synthesized using scheme had high specific capacitance stability. And mechanism its reaction process explored through in situ X-ray diffraction (XRD) theoretical calculations. addition, same treatment carried out series carboxyl-coordinated MOFs, confirmed principle obtain higher This paper explains functionalization nano-MOFs by polyphenolic compounds, providing new ideas for research nano-MOFs.

Язык: Английский

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Doped MXenes—A new paradigm in 2D systems: Synthesis, properties and applications

Progress in Materials Science, Год журнала: 2023, Номер 139, С. 101166 - 101166

Опубликована: Июль 22, 2023

Since 2011, 2D transition metal carbides, carbonitrides and nitrides known as MXenes have gained huge attention due to their attractive chemical electronic properties. The diverse functionalities of make them a promising candidate for multitude applications. Recently, doping MXene with metallic non-metallic elements has emerged an exciting new approach endow properties this systems, opening paradigm theoretical experimental studies. In review, we present comprehensive overview on the recent progress in emerging field doped MXenes. We compare different strategies; techniques used characterization discuss enhanced distinct advantages applications such electrocatalysis, energy storage, photovoltaics, electronics, photonics, environmental remediation, sensors, biomedical is elaborated. Additionally, developments photovoltaics electronics are explored provide prospect into specific along underlying mechanisms. Lastly, challenges take forward thriving field.

Язык: Английский

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Recent advances in metal-organic framework (MOF)-based agricultural sensors for metal ions: a review

Microchimica Acta, Год журнала: 2023, Номер 191(1)

Опубликована: Дек. 28, 2023

Язык: Английский

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Kinetic-Thermodynamic Promotion Engineering toward High-Density Hierarchical and Zn-Doping Activity-Enhancing ZnNiO@CF for High-Capacity Desalination

Nano-Micro Letters, Год журнала: 2024, Номер 16(1)

Опубликована: Март 4, 2024

Despite the promising potential of transition metal oxides (TMOs) as capacitive deionization (CDI) electrodes, actual capacity TMOs electrodes for sodium storage is significantly lower than theoretical capacity, posing a major obstacle. Herein, we prepared kinetically favorable Zn

Язык: Английский

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Dynamic Phase Transformations of Prussian Blue Analogue Crystals in Hydrotherms

Journal of the American Chemical Society, Год журнала: 2024, Номер 146(24), С. 16659 - 16669

Опубликована: Июнь 7, 2024

Prussian blue analogue (PBA)/metal–organic frameworks (MOFs) are multifunctional precursors for the synthesis of metal/metal compounds, carbon, and their derived composites (P/MDCs) in chemical, medical, energy, other applications. P/MDCs combine advantages both high specific surface area PBA/MOF electronic conductivity metal compound/carbon. Although calcination under different atmospheres has been extensively studied, transformation mechanism hydrothermal conditions remains unclear. The qualitative preparation a challenge. Here, we select PBA to construct machine-learning model measure its phase diagram. architecture–activity relationship substances among nine parameters was analyzed PBA. Excitingly, established universal accurately fabricate 31 derivates. Additionally, performed three-dimensional reconstructed transmission electron microscopy, X-ray absorption fine structure spectroscopy, ultraviolet photoelectron situ powder diffraction, theoretical calculation analyze derivatives oxygen evolution reaction clarify mechanisms. We uncover unified principles PBA, expect guide design wide range composites.

Язык: Английский

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Tuning the local coordination environment of single-atom catalysts for enhanced electrocatalytic activity

EnergyChem, Год журнала: 2024, Номер 6(2), С. 100119 - 100119

Опубликована: Фев. 17, 2024

Язык: Английский

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Bimetallic NiCo Metal–Organic Frameworks with High Stability and Performance Toward Electrocatalytic Oxidation of Urea in Seawater

Inorganic Chemistry, Год журнала: 2024, Номер 63(34), С. 15813 - 15820

Опубликована: Авг. 14, 2024

The urea oxidation reaction (UOR) is an alternative anodic for hydrogen generation via water splitting. significance of UOR lies in both H2 production and the decontamination urea-containing wastewater. Commercial electrocatalysts this field are generally based on noble metals show several limitations. Bimetal–organic frameworks (BMOFs) can be excellent candidates replacement noble-metal-based catalysts beacuse their promising features, such as a tunable structure, high surface area, abundant sites electrocatalysis. In study, series nickel–cobalt BMOFs (Nix-Coy-BMOFs: x y refer to molar fraction Ni Co) were synthesized applied UOR. particular, Ni0.15Co0.85-MOF material with structure similar that its parent Co-MOF, revealed exceptional electrocatalytic performance, evidenced by low values overpotential (1.33 V vs RHE at 10 mA cm–2), TOF (0.47 s–1), Tafel slope (125 mV dec–1). At 40 cm–2 current density, also showed stability during 72 h tests. This performance NiCo-BMOF assigned synergistic effect between Co Ni, active sites, porosity, all which result increased rate due acceleration charge mass transfers. Thus, present work introduces efficient noble-metal-free energy from urea-based

Язык: Английский

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Entropy Engineering Constrain Phase Transitions Enable Ultralong‐life Prussian Blue Analogs Cathodes

Advanced Science, Год журнала: 2024, Номер 11(28)

Опубликована: Апрель 26, 2024

Abstract Prussian blue analogs (PBAs) are considered as one of the most potential electrode materials in capacitive deionization (CDI) due to their unique 3D framework structure. However, practical applications suffer from low desalination capacity and poor cyclic stability. Here, an entropy engineering strategy is proposed that incorporates high‐entropy (HE) concept into PBAs address unfavorable multistage phase transitions during CDI desalination. By introducing five or more metals, which share N coordination site, hexacyanoferrate (HE‐HCF) constructed, thereby increasing configurational system above 1.5R placing it category. As a result, developed HE‐HCF demonstrates remarkable cycling performance, with retention rate over 97% after undergoing 350 ultralong‐life cycles adsorption/desorption. Additionally, exhibits high 77.24 mg g −1 at 1.2 V. Structural characterization theoretical calculation reveal not only helps restrain transition strengthen structural stability, but also optimizes Na + ions diffusion path energy barrier, accelerates reaction kinetics thus improves performance. This research introduces new approach for designing electrodes cost, long‐lasting durability applications.

Язык: Английский

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Construction of fully coated polypyrrole oxygen-barrier film based on MXene nanosheets for high reliability capacitive deionization

Separation and Purification Technology, Год журнала: 2024, Номер 337, С. 126362 - 126362

Опубликована: Янв. 9, 2024

Язык: Английский

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Titanium Carbon Oxide Flakes with Tunable Interlayer Spacing for Efficient Capacitive Deionization

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Март 26, 2024

Abstract The environmental toxicity caused by heavy metal ions is always taken seriously. Capacitive deionization (CDI), as an emerging and effective treatment method, widely studied. Among them, the rational design development of efficient electrodes based on high theoretical capacitance, conductivity, stability have great prospects for CDI applications. In this study, a series 2D titanium carbide oxide flakes (2D TCOs) are synthesized using cation‐giving modulation strategy, interlayer spacing materials successfully controlled confining cations (tetraalkylammonium hydroxides, TAAH) with different radii between layers. Interestingly, these TCOs exhibit varying electrochemical properties due to their spacings. flakes‐tetrapropylammonium hydroxide (TCOs‐TPAH) maximum exhibits best performance in sodium ion embedding de‐embedding, capacity 53.11 mg g −1 . addition, capacitive removal efficiency (Fe 3+ , Cr Cu 2+ Cd Co Ni Pb ) can reach over 97% within 2 h. This work presents simple creative strategy bottom‐up synthesis oversized nanomaterials, thus supporting further high‐performance fields energy

Язык: Английский

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