Optimized Fabrication of Supercapacitor Using MOF-Derived NiCo₂O₄ with Porous Carbon as Cathode: Electrochemical Characterization and Stability Analysis using Time Series Analysis Technique

ACS Applied Electronic Materials, Год журнала: 2024, Номер 6(6), С. 4369 - 4380

Опубликована: Июнь 5, 2024

This study utilizes metal–organic framework (MOF)-derived NiCo2O4 with porous carbon (PC) as the cathode to fabricate both symmetric and asymmetric supercapacitor devices an optimized anode (NiCo2O4/PC, activated (AC), polyaniline (PANI)) aqueous electrolytes. Initially, NiCo2O4/PC material was synthesized from a bimetallic–organic (NiCo-BTC MOF) using carefully thermal conditions. Following comprehensive characterizations, employed in fabrication of solid-state by meticulously selecting electrode–electrolyte pair maximize performance. To achieve this, electrochemical characterizations NiCo2O4/PC/NF (NF: Ni foam) were carried out various The 1.0 M potassium hydroxide (KOH) electrolyte demonstrated most promising performance for composite. Subsequently, KOH-based gel evaluate three devices. These included two devices, NiCo2O4/PC/NF–AC/NF NiCo2O4/PC/NF–PANI/NF, well one device, NiCo2O4/PC/NF–NiCo2O4/PC/NF. Notably, NiCo2O4/PC/NF–PANI/NF device exhibited energy density almost 3.23 3.78 times higher than those NiCo2O4/PC/NF-NiCo2O4/PC/NF respectively. long-term stability system, analyzed over 2000 charge–discharge cycles time series analysis, reveals insights into its behavior extended duration. illustrated efficacy PANI (instead AC) MOF-derived material. Furthermore, aforementioned high-performing integrated power LED, demonstrating practical applicability.

Язык: Английский

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High‐Performance AgSbTe₂ Thermoelectrics: Advances, Challenges, and Perspectives

Advanced Materials, Год журнала: 2024, Номер unknown

Опубликована: Сен. 2, 2024

Abstract Environmental‐friendless and high‐performance thermoelectrics play a significant role in exploring sustainable clean energy. Among them, AgSbTe 2 thermoelectrics, benefiting from the disorder cation sublattice interface scattering secondary phases of Ag Te Sb 3 , exhibit low thermal conductivity maximum figure‐of‐merit ZT 2.6 at 573 K via optimizing electrical properties addressing phase transition issues. Therefore, shows considerable potential as promising medium‐temperature thermoelectric material. Additionally, with increasing demands for device integration portability information age, research on flexible wearable aligns contemporary development needs, leading to growing number findings. This work provides detailed timely review ‐based materials devices. Principles performance optimization strategies are highlighted enhancement . The current challenges future directions pointed out. will guide practical applications.

Язык: Английский

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Advances and Challenges in SnTe‐Based Thermoelectrics

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 31, 2025

Abstract SnTe‐based thermoelectric materials have attracted significant attention for their exceptional performance in mid‐to‐high temperature ranges, positioning them as promising candidates power generation. However, efficiency is constrained by challenges related to electronic structure, defect chemistry, and phonon behavior. This review comprehensively summarizes advancements SnTe devices over the past five years, focusing on strategies address these limitations. Key approaches include regulation, carrier transport optimization, engineering enhance electrical conductivity, reduce thermal improve overall conversion efficiency. The highlights breakthroughs fabrication methods, doping alloying, composite designs, development of novel nanostructures, with particular emphasis 2D such monolayers, bilayers, thin films, which offer new opportunities enhancement. Additionally, it provides an overview devices, covering techniques, stability, flexible device development. Despite progress, remain developing n‐type materials, optimizing interfaces, ensuring long‐term maximizing fills gaps existing literature offers valuable insights guidance future research aimed at improving properties, advancing integration, driving commercial viability practical applications.

Язык: Английский

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Advances and Outlooks for Carbon Nanotube‐Based Thermoelectric Materials and Devices

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 16, 2025

Abstract The unique structure of carbon nanotubes (CNTs) endows them with exceptional electrical and mechanical properties, along a high surface area, making highly beneficial for use as flexible, high‐performing thermoelectric materials. As result, the application CNTs in field has become increasingly widespread. Considering rapid advancements this field, review offers timely overview most recent progress on CNT‐based materials devices over past five years. This begins by introducing fundamental concepts mechanisms Then new strategies are explored to enhance their performance, focusing doping composites, while emphasizing importance CNT stability key research area. Additionally, latest design expanded scenarios flexible wearable CNTs‐based summarized. Finally, current challenges addressed future directions development discussed.

Язык: Английский

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CdSe Quantum Dots Enable High Thermoelectric Performance in Solution‐Processed Polycrystalline SnSe

Small, Год журнала: 2024, Номер 20(28)

Опубликована: Фев. 2, 2024

Abstract Here, a high peak ZT of ≈2.0 is reported in solution‐processed polycrystalline Ge and Cd codoped SnSe. Microstructural characterization reveals that CdSe quantum dots are successfully introduced by solution process method. Ultraviolet photoelectron spectroscopy evinces enhance the density states electronic structure SnSe, which leads to large Seebeck coefficient. It found codoping simultaneously optimizes carrier concentration improves electrical conductivity. The enhanced coefficient optimization lead marked increase power factor. combined with strong lattice strain give rise phonon scattering, leading an ultralow thermal Consequently, thermoelectric performance realized SnSe designing dot structures introducing strain. This work provides new route for prospective materials microstructural manipulation chemistry.

Язык: Английский

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Argon Plasma Bombardment Induces Surface‐Rich Sn Vacancy Defects to Enhance the Thermoelectric Performance of Polycrystalline SnSe

Advanced Functional Materials, Год журнала: 2024, Номер 34(37)

Опубликована: Март 10, 2024

Abstract Nanoscale defects can induce the effective modulation of carrier concentration, mobility, and phonon scattering to secure high thermoelectric performance in semiconductors. However, it is still limited effectively controlling nanoscale materials. Here, argon plasma bombardment employed introduce a large number point dislocations microcrystalline SnSe powders, synthesized by solvothermal method. After sintering these powders into polycrystalline bulk materials, shows ZT increasing up 66.7% (from 0.36 0.6 at 773 K). Through detailed micro/nanostructure characterizations first‐principles calculations, underlying mechanism elucidated for evaluation performance. This work provides deep understanding modulating presents experimental evidence experience design synthesis efficient making significant contributions future green energy technologies.

Язык: Английский

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Hydrogel‐Based Functional Materials for Thermoelectric Applications: Progress and Perspectives

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Сен. 2, 2024

Abstract Hydrogels are renowned for their complex structures and unique physicochemical properties, establishing them as key materials in bioenergy harvesting applications. They used various applications, including triboelectric nanogenerators, piezoelectric, hydraulic, thermoelectric, biofuel cells. Among these, hydrogels thermoelectric applications represent a technology capable of continuously converting biological energy (thermal energy) into electrical energy. This shows great potential commercial value body monitoring, storage, human‐machine interaction Given its rapid development, timely review focusing on the research progress composites is presented. discusses types power generation refrigeration, strategies enhancing performance, field. Finally, remaining challenges feasible identified improving efficiency, stability, application range, system‐level integration next‐generation

Язык: Английский

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Flower-Like CuS/MoS₂Nanoflake Composites as Heterojunctions for Microwave Absorption

ACS Applied Nano Materials, Год журнала: 2024, Номер 7(7), С. 7237 - 7247

Опубликована: Март 22, 2024

Molybdenum disulfide (MoS2), a two-dimensional transition metal (TMD), is of great concern in microwave absorption (MA). Nevertheless, pure MoS2 has limitations realizing outstanding MA performance owing to its lower conductivity and smaller dielectric constant. To address this, compounding it with highly conductive CuS not only improves impedance-matching properties but also increases the interfacial polarization within material enhances material. In this study, flower-like heterostructured CuS/MoS2 nanoflake composites were prepared using hydrothermal method. The characterization morphology reveals existence considerable number heterogeneous interfaces composites, resulting increased loss capability. By adjusting ratio MoS2, CuS/MoS2-30 composite achieved an effective bandwidth (EAB) 6.4 GHz (from 11.6 18 GHz) minimum reflection (RLmin) −57.89 dB. Meanwhile, CuS/MoS2-50 matched thickness 2.17 mm EAB 6 RLmin value −63.09 These are based on sulfide heterojunction formation absorbents; without coupling magnetic materials, shows excellent synergistic through dielectric–dielectric interaction. It demonstrated that potentially ideal materials.

Язык: Английский

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In-situ electropolymerized polyaniline nanoparticles grown on longan shell-derived porous carbon for high-performance supercapacitor electrode

Journal of Electroanalytical Chemistry, Год журнала: 2024, Номер 963, С. 118293 - 118293

Опубликована: Апрель 23, 2024

Язык: Английский

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Performance analysis of a refrigeration system integrated with a thermoelectric cooler and microchannels in terms of heat transfer using a hybrid nanofluid

Applied Thermal Engineering, Год журнала: 2024, Номер 250, С. 123465 - 123465

Опубликована: Май 24, 2024

Язык: Английский

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