Charge self-regulation in 1T'''-MoS2 structure with rich S vacancies for enhanced hydrogen evolution activity

Nature Communications, Год журнала: 2022, Номер 13(1)

Опубликована: Окт. 10, 2022

Active electronic states in transition metal dichalcogenides are able to prompt hydrogen evolution by improving absorption. However, the development of thermodynamically stable hexagonal 2H-MoS2 as catalyst is likely be shadowed its limited active state. Herein, charge self-regulation effect mediated tuning Mo-Mo bonds and S vacancies revealed metastable trigonal MoS2 (1T'''-MoS2) structure, which favarable for generation boost reaction activity. The optimal 1T'''-MoS2 sample exhibits a low overpotential 158 mV at 10 mA cm-2 Tafel slope 74.5 dec-1 acidic conditions, far exceeding counterpart (369 137 dec-1). Theoretical modeling indicates that boosted performance attributed formation massive induced defective with rich vacancies.

Язык: Английский

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Hierarchical Spatial Confinement Unlocking the Storage Limit of MoS₂ for Flexible High-Energy Supercapacitors

ACS Nano, Год журнала: 2024, Номер 18(3), С. 2149 - 2161

Опубликована: Янв. 8, 2024

Molybdenum sulfide (MoS2) is a promising electrode material for supercapacitors; however, its limited Mo/S edge sites and intrinsic inert basal plane give rise to sluggish active electronic states, thus constraining electrochemical performance. Here we propose hierarchical confinement strategy develop ethylene molecule (EG)-intercalated Co-doped sulfur-deficient MoS2 (Co-EG/SV-MoS2) efficient durable K-ion storage. Theoretical analyses suggest that the intercalation-confined EG lattice-confined Co can enhance interfacial storage capacity while reducing diffusion barrier. Experimentally, intercalated molecules with mildly properties induced creation of sulfur vacancies, expanded interlayer spacing, regulated 2H–1T phase transition, strengthened structural grafting between layers, thereby facilitating ion ensuring durability. Moreover, dopants occupying initial Mo initiated charge transfer, activating plane. Consequently, optimized Co-EG/SV-MoS2 exhibited substantially improved Flexible supercapacitors assembled delivered notable areal energy density 0.51 mW h cm–2 at 0.84 good flexibility. Furthermore, supercapacitor devices were integrated strain sensor create self-powered system capable real-time detection human joint motion.

Язык: Английский

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Self-supported electrocatalysts for the hydrogen evolution reaction

Materials Chemistry Frontiers, Год журнала: 2022, Номер 7(4), С. 567 - 606

Опубликована: Дек. 15, 2022

The high-performance self-supported electrocatalysts for the hydrogen evolution reaction are systematically summarized.

Язык: Английский

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Recent Progress on Phase Engineering of Nanomaterials

Chemical Reviews, Год журнала: 2023, Номер 123(23), С. 13489 - 13692

Опубликована: Ноя. 14, 2023

As a key structural parameter, phase depicts the arrangement of atoms in materials. Normally, nanomaterial exists its thermodynamically stable crystal phase. With development nanotechnology, nanomaterials with unconventional phases, which rarely exist their bulk counterparts, or amorphous have been prepared using carefully controlled reaction conditions. Together these methods are beginning to enable engineering (PEN), i.e., synthesis phases and transformation between different obtain desired properties functions. This Review summarizes research progress field PEN. First, we present representative strategies for direct modulation diverse kinds nanomaterials. We cover ranging from metal nanostructures such as Au, Ag, Cu, Pd, Ru, alloys; oxides, borides, carbides; transition dichalcogenides (TMDs) 2D layered review growth wet-chemical reduction seed-mediated epitaxial chemical vapor deposition (CVD), high pressure transformation, electron ion-beam irradiation. After that, summarize significant influence on various unconventional-phase also discuss potential applications developed areas including catalysis, electrochemical energy storage (batteries supercapacitors), solar cells, optoelectronics, sensing. Finally, existing challenges future directions

Язык: Английский

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Crystal-Phase Engineering in Heterogeneous Catalysis

Chemical Reviews, Год журнала: 2023, Номер 124(1), С. 164 - 209

Опубликована: Дек. 4, 2023

The performance of a chemical reaction is critically dependent on the electronic and/or geometric structures material in heterogeneous catalysis. Over past century, Sabatier principle has already provided conceptual framework for optimal catalyst design by adjusting structure catalytic via change composition. Beyond composition, it essential to recognize that atomic catalyst, encompassing terraces, edges, steps, kinks, and corners, have substantial impact activity selectivity reaction. Crystal-phase engineering capacity bring about alterations configurations enabling control over coordination numbers, morphological features, arrangement surface atoms. Modulating crystallographic phase therefore an important strategy improving stability, activity, materials. Nonetheless, complete understanding how depends crystal remains elusive, primarily due absence molecular-level view active sites across various phases. In this review, we focus assessing dependence phases elucidate challenges complexities inherent catalysis, ultimately aiming improved design.

Язык: Английский

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Phase Engineering of Nanomaterials: Transition Metal Dichalcogenides

Chemical Reviews, Год журнала: 2024, Номер 124(7), С. 4479 - 4539

Опубликована: Март 29, 2024

Crystal phase, a critical structural characteristic beyond the morphology, size, dimension, facet, etc., determines physicochemical properties of nanomaterials. As group layered nanomaterials with polymorphs, transition metal dichalcogenides (TMDs) have attracted intensive research attention due to their phase-dependent properties. Therefore, great efforts been devoted phase engineering TMDs synthesize controlled phases, especially unconventional/metastable for various applications in electronics, optoelectronics, catalysis, biomedicine, energy storage and conversion, ferroelectrics. Considering significant progress synthesis TMDs, we believe that comprehensive review on is promote fundamental studies practical applications. This Review aims provide introduction discussion crystal structures, synthetic strategies, TMDs. Finally, our perspectives challenges opportunities will also be discussed.

Язык: Английский

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Engineered Two-Dimensional Transition Metal Dichalcogenides for Energy Conversion and Storage

Chemical Reviews, Год журнала: 2024, Номер 124(16), С. 9376 - 9456

Опубликована: Июль 23, 2024

Designing efficient and cost-effective materials is pivotal to solving the key scientific technological challenges at interface of energy, environment, sustainability for achieving NetZero. Two-dimensional transition metal dichalcogenides (2D TMDs) represent a unique class that have catered myriad energy conversion storage (ECS) applications. Their uniqueness arises from their ultra-thin nature, high fractions atoms residing on surfaces, rich chemical compositions featuring diverse metals chalcogens, remarkable tunability across multiple length scales. Specifically, electronic/electrical, optical, thermal properties 2D TMDs been widely exploited electrochemical (e.g., electrocatalytic water splitting), anodes in alkali ion batteries supercapacitors), photocatalysis, photovoltaic devices, thermoelectric Furthermore, performances can be greatly boosted by judicious structural tuning through phase, size, composition, defect, dopant, topological, heterostructure engineering. The challenge, however, design control such engineering levers, optimally specifically, maximize performance outcomes targeted In this review we discuss, highlight, provide insights significant advancements ongoing research directions approaches improving potential ECS

Язык: Английский

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1T′-transition metal dichalcogenide monolayers stabilized on 4H-Au nanowires for ultrasensitive SERS detection

Nature Materials, Год журнала: 2024, Номер 23(10), С. 1355 - 1362

Опубликована: Апрель 8, 2024

Язык: Английский

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Solution-Processable and Printable Two-Dimensional Transition Metal Dichalcogenide Inks

Chemical Reviews, Год журнала: 2024, Номер 124(9), С. 5795 - 5845

Опубликована: Апрель 19, 2024

Two-dimensional (2D) transition metal dichalcogenides (TMDs) with layered crystal structures have been attracting enormous research interest for their atomic thickness, mechanical flexibility, and excellent electronic/optoelectronic properties applications in diverse technological areas. Solution-processable 2D TMD inks are promising large-scale production of functional thin films at an affordable cost, using high-throughput solution-based processing techniques such as printing roll-to-roll fabrications. This paper provides a comprehensive review the chemical synthesis solution-processable printable ink materials subsequent assembly into applications. We start principles protocols various methods nanosheet crystals solution phase. The depositing solid-state discussed. Then, we these areas including electronics, optoelectronics, others. To conclude, summary key scientific/technical challenges future opportunities is provided.

Язык: Английский

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Solution-processed wafer-scale indium selenide semiconductor thin films with high mobilities

Nature Electronics, Год журнала: 2025, Номер unknown

Опубликована: Фев. 3, 2025

Язык: Английский

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