Flexible optical limiters based on Cu<sub>3</sub>VSe<sub>4</sub> nanocrystals

Wang, Qiang; Zhai, Xin-Ping; Ma, Bo; Xiao, Mingjun; Shang, Wen; Zeng, Zhi-Cong; Zhang, Hao‐Li

doi:10.1039/d3nr00498h

Cited by 9 publications

(1 citation statement)

References 46 publications

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“…Recently, a class of ternary copper chalcogenides, known as sulvanites (due to the parent compound, the sulvanite mineral Cu 3 VS 4 ), has emerged and gained attention in the field of optoelectronics and energy storage due to its unique crystal structure, optical, and electronic properties. , The compounds in this class, with the general formula Cu 3 MX 4 (MV, Nb, or Ta; XS, Se, or Te), possess band gaps ranging from 1.3 to 2.8 eV (depending on the chemical composition) within the range of interest for optoelectronics; in addition, several sulvanite compounds exhibit p -type conductivity, with high carrier mobility. , As a result, the sulvanite compounds have been used in various fields such as photovoltaics, hydrogen evolution catalysis, laser protection, and various battery technologies (sodium-ion, potassium-ion, and lithium-ion). − In addition to their electronic properties, sulvanites containing Cu and V benefit from the Earth abundance of these elements, making them sustainable.…”

Section: Introductionmentioning

confidence: 99%

Size-Controlled Cu₃VSe₄ Nanocrystals as Cathode Material in Platinum-Free Dye-Sensitized Solar Cells

Chang,

Kaur,

Prado-Rivera

et al. 2024

ACS Appl. Mater. Interfaces

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In this work, we report the first single-step, size-controlled synthesis of Cu 3 VSe 4 cuboidal nanocrystals, with the longest dimension ranging from 9 to 36 nm, and their use in replacing the platinum counter electrode in dye-sensitized solar cells. Cu 3 VSe 4 , a ternary semiconductor from the class of sulvanites, is theoretically predicted to have good hole mobility, making it a promising candidate for charge transport in solar photovoltaic devices. The identity and crystalline purity of the Cu 3 VSe 4 nanocrystals were validated by X-ray powder diffraction (XRD) and Raman spectroscopy. The particle size was determined from the XRD data using the Williamson−Hall equation and was found in agreement with the transmission electron microscopy imaging. Based on the electrochemical activity of the Cu 3 VSe 4 nanocrystals, studied by cyclic voltammetry, the nanomaterials were further employed for fabricating counter electrodes (CEs) in Pt-free dye-sensitized solar cells. The counter electrodes were prepared from Cu 3 VSe 4 nanocrystals as thin films, and the charge transfer kinetics were studied by electrochemical impedance spectroscopy. The work demonstrates that Cu 3 VSe 4 counter electrodes successfully replace platinum in DSSCs. CEs fabricated with the Cu 3 VSe 4 nanocrystals having an average particle size of 31.6 nm outperformed Pt, leading to DSSCs with the highest power conversion efficiency (5.93%) when compared with those fabricated with the Pt CE (5.85%).

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Section: Introductionmentioning

confidence: 99%

Size-Controlled Cu₃VSe₄ Nanocrystals as Cathode Material in Platinum-Free Dye-Sensitized Solar Cells

Chang,

Kaur,

Prado-Rivera

et al. 2024

ACS Appl. Mater. Interfaces

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Fractal Growth of 2D NbSe₂ for Broadband Nonlinear Optical Limiting

Wang,

Ma,

Wang

et al. 2024

Adv Funct Materials

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The compelling demand for laser protection both for civil and defense use calls for new‐generation nonlinear optical materials. Chemical vapor deposition (CVD) techniques provide extra tricks to modulate crystal optical nonlinearity through fractal growth. The synthesized 2D NbSe2 and its fractal structures exhibit giant, broadband laser attenuation behaviors extending into the near Infrared (NIR) range. Particularly, the optical limiting performance generally correlates with the fractal dimension, where Fractal NbSe2 demonstrates enhanced third‐order optical nonlinearity at a huge nonlinear absorption coefficient of 9.7 × 10−4 m W−1 and an ultralow starting threshold of 5 mJ cm−2 at 532 nm. Various techniques include femtosecond spectroscopy, Density functional theory (DFT) calculation and Kelvin probe force microscopy disclose the origin of the strong nonlinearity of the 2D NbSe2 crystals, and suggest the formation of edge states and overall faster carrier dynamics, larger surface contact potential difference NbSe2 fractals contribute to their even augmented nonlinear responses. Fractal engineering thus opens new avenues to fabricate highly efficient laser protection materials, and the blocking of intense beam (a large attenuation factor over 13.3 dB at 532 nm) while allowing transmission of weak one (a high linear optical transmittance over 80%) fulfills the much desired “smart” defense.

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Cu₃VSe₄ Cathode for Rechargeable Magnesium Batteries: Favorable Chemical and Electronic Structures Inducing Intercalation and Displacement Reactions

Tao,

Li,

Tang

et al. 2024

Adv Funct Materials

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Rechargeable Mg batteries are an advantageous energy‐storage technology with low cost and high safety, but the design of high‐performance cathode materials is currently the major difficulty. Herein, a new cathode material of Cu3VSe4 is fabricated with a comprehensive consideration of the chemical and electronic structures. The intermediate band semiconductor Cu3VSe4 has a cubic crystal structure containing interlaced 3D tunnels. The V and Se atoms form chemical bonds with high covalent proportions and facilitate the charge delocalization via the V‒Se bonds. Because of these features, Cu3VSe4 provides a high capacity of 251 mAh g‒1 with co‐redox of Cu, V, and Se elements and an outstanding rate performance of 44 mAh g‒1 at 15 A g‒1. Prominently, a high mass load of 3.0 mg cm‒2 is achieved without obvious rate capability decay, which is quite favorable to pair with the high‐capacity Mg metal anode in practical application. The mechanism investigation and theoretical computation demonstrate that Cu3VSe4 undergoes first a Mg‐intercalation and then a displacement reaction, during which the crystal structure is maintained, assisting the reaction reversibility and cycling stability. These findings reveal a rational design principle of rechargeable Mg battery cathodes based on a comprehensive consideration of chemical and electronic structures.

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Flexible optical limiters based on Cu₃VSe₄ nanocrystals

Abstract: Optical limiters are in great need to protect eyes, sensitive optoelectronic devices like photodetectors and sensors from laser damage but currently plagued by low efficiency. In this work, we utilized...

Cited by 9 publications

References 46 publications

Size-Controlled Cu₃VSe₄ Nanocrystals as Cathode Material in Platinum-Free Dye-Sensitized Solar Cells

Size-Controlled Cu₃VSe₄ Nanocrystals as Cathode Material in Platinum-Free Dye-Sensitized Solar Cells

Fractal Growth of 2D NbSe₂ for Broadband Nonlinear Optical Limiting

Cu₃VSe₄ Cathode for Rechargeable Magnesium Batteries: Favorable Chemical and Electronic Structures Inducing Intercalation and Displacement Reactions

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Flexible optical limiters based on Cu3VSe4 nanocrystals

Abstract: Optical limiters are in great need to protect eyes, sensitive optoelectronic devices like photodetectors and sensors from laser damage but currently plagued by low efficiency. In this work, we utilized...

Cited by 9 publications

References 46 publications

Size-Controlled Cu3VSe4 Nanocrystals as Cathode Material in Platinum-Free Dye-Sensitized Solar Cells

Size-Controlled Cu3VSe4 Nanocrystals as Cathode Material in Platinum-Free Dye-Sensitized Solar Cells

Fractal Growth of 2D NbSe2 for Broadband Nonlinear Optical Limiting

Cu3VSe4 Cathode for Rechargeable Magnesium Batteries: Favorable Chemical and Electronic Structures Inducing Intercalation and Displacement Reactions

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Product

Resources

About

Flexible optical limiters based on Cu₃VSe₄ nanocrystals

Size-Controlled Cu₃VSe₄ Nanocrystals as Cathode Material in Platinum-Free Dye-Sensitized Solar Cells

Size-Controlled Cu₃VSe₄ Nanocrystals as Cathode Material in Platinum-Free Dye-Sensitized Solar Cells

Fractal Growth of 2D NbSe₂ for Broadband Nonlinear Optical Limiting

Cu₃VSe₄ Cathode for Rechargeable Magnesium Batteries: Favorable Chemical and Electronic Structures Inducing Intercalation and Displacement Reactions