Facial Grinding Method for Synthesis of High-Purity CuS Nanosheets

Qin, Yang; Kong, Xianggui; Lei, Deqiang; Lei, Xiaodong

doi:10.1021/acs.iecr.7b04616

Cited by 28 publications

(16 citation statements)

References 43 publications

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“…Figure e presents the Raman spectrum of Cu 9 S 5 nanoflakes, which has a strong peak at 470 cm −1 . This characteristic peak matches well with published works of Cu‐S compounds . While theoretical calculations have predicted that it was attributed to the stretching mode ( A 1 g ) of S‐S bond, the corresponding experimental proof has not been provided yet.…”

Section: Resultssupporting

confidence: 88%

Salt‐Assisted Growth of P‐type Cu₉S₅ Nanoflakes for P‐N Heterojunction Photodetectors with High Responsivity

Yang

Liu

Han

et al. 2019

Adv Funct Materials

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P‐n junctions based on two dimensional (2D) van der Waals (vdW) heterostructure are one of the most promising alternatives in next‐generation electronics and optoelectronics. By choosing different 2D transition metal dichalcogenides (TMDCs), the p‐n junctions have tailored energy band alignments and exhibit superior performance as photodetectors. The p‐n diodes working at reverse bias commonly have high detectivity due to suppressed dark current but suffer from low responsivity resulting from small quantum efficiency. Greater build‐in electric field in the depletion layer can improve the quantum efficiency by reducing recombination of charge carriers. Herein, Cu9S5, a novel p‐type semiconductor with direct bandgap and high optical absorption coefficient, is synthesized by salt‐assisted chemical vapor deposition (CVD) method. The high density of holes in Cu9S5 endows the constructed p‐n junction, Cu9S5/MoS2, with strong build‐in electric field according to Anderson heterojunction model. Consequently, the Cu9S5/MoS2 p‐n heterojunction has low dark current at reverse bias and high photoresponse under illumination due to the efficient charge separation. The Cu9S5/MoS2 photodetector exhibits good photodetectivity of 1.6 × 1012 Jones and photoresponsivity of 76 A W−1 under illumination. This study demonstrates Cu9S5 as a promising p‐type semiconductor for high‐performance p‐n heterojunction diodes.

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Section: Resultssupporting

confidence: 88%

Salt‐Assisted Growth of P‐type Cu₉S₅ Nanoflakes for P‐N Heterojunction Photodetectors with High Responsivity

Yang

Liu

Han

et al. 2019

Adv Funct Materials

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“…The lower electron transfer resistance can be ascribed to the high electron collection efficiency and elevated electron transfer rate provided by the double-shelled structure. Notably, the slope in the low frequency region along the imaginary axis for 2-CuS NCs/GCE was subvertical, demonstrating a low ion diffusion resistance issued from enhanced porosity of the shells and interior cavities [18,26].…”

Section: Electrochemical Performance Of 2-cus Ncs/gcementioning

confidence: 99%

Design of Double-Shelled CuS Nanocages to Optimize Electrocatalytic Dynamic for Sensitive Detection of Ascorbic Acid

et al. 2020

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Although transition metal sulfides have presented prospect in electrochemical sensing, their electrocatalytic performance still cannot meet the demands for practical applications due to the difficulties in mass transport and electron transfer. In this work, double-shelled CuS nanocages (2-CuS NCs) were prepared for enzyme-free ascorbic (AA) sensor through a Cu 2 O-templated method. The unique double-shelled hollow structure displayed large specific surface areas, ordered diffusion channels, increased volume occupying rate, and accelerated electron transfer rate, resulting in enhanced electrochemical dynamic. As a sensing electrode for AA, 2-CuS NCs modified glassy carbon electrode (2-CuS NCs/GCE) exhibited eminent electrocatalytic activity in terms of satisfying sensitivity (523.7 μA mM −1 cm −2 ), short response time (0.31 s), and low limit of detection (LOD, 0.15 μM). 2-CuS NCs look promising for analytical sensing of AA in electrochemical sensors thanks to its prominent electrocatalytic kinetics issued from double-shelled hollow porous structure.

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“…Applications of CuS in solar cells, lithium ion battery cathode materials, aluminum ion batteries, and photocatalysts have been studied widely. 20,21 However, there is limited research of copper sulfides in CO 2 electroreduction. It has been reported that CuS nanosheet arrays grown on nickel foam (CuS@NF) exhibited a high selectivity for CH 4 with a long-term stability, but it was only elucidated experimentally.…”

Section: ■ Introductionmentioning

confidence: 99%

CuS Nanosheet Arrays for Electrochemical CO₂ Reduction with Surface Reconstruction and the Effect on Selective Formation of Formate

Dou

Qin

Zhang

et al. 2021

ACS Appl. Energy Mater.

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Copper-based catalysts have shown excellent performance in electrochemical CO 2 reduction, but there has not been much study on copper sulfides. In our work, a simple and low-temperature chemical bath deposition method was used to fabricate CuS nanosheet arrays on brass, on which a Faradaic efficiency over 70% and a production rate over 50 mA•cm −2 for formate were obtained at a low potential of −0.7 V vs RHE when used as a catalytic electrode for CO 2 reduction. During the CO 2 reduction process, CuS nanosheets were partially reduced to Cu 0 and reconstructed to a nanowire network. It was found that residual S beneath the Cu 0 layer lowered the binding energies of intermediates HCOO* and *COOH, promoting their desorption and the successive formation of HCOOH or HCOO − , thus regulating the high selectivity of the product. This work provides a convenient and economical method for developing a highly active electrocatalyst for producing HCOOH in CO 2 electroreduction, and it is beneficial to understand the mechanism of enhanced selectivity to HCOO − for CuS electrode materials.

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Facial Grinding Method for Synthesis of High-Purity CuS Nanosheets

Cited by 28 publications

References 43 publications

Salt‐Assisted Growth of P‐type Cu₉S₅ Nanoflakes for P‐N Heterojunction Photodetectors with High Responsivity

Salt‐Assisted Growth of P‐type Cu₉S₅ Nanoflakes for P‐N Heterojunction Photodetectors with High Responsivity

Design of Double-Shelled CuS Nanocages to Optimize Electrocatalytic Dynamic for Sensitive Detection of Ascorbic Acid

CuS Nanosheet Arrays for Electrochemical CO₂ Reduction with Surface Reconstruction and the Effect on Selective Formation of Formate

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Facial Grinding Method for Synthesis of High-Purity CuS Nanosheets

Cited by 28 publications

References 43 publications

Salt‐Assisted Growth of P‐type Cu9S5 Nanoflakes for P‐N Heterojunction Photodetectors with High Responsivity

Salt‐Assisted Growth of P‐type Cu9S5 Nanoflakes for P‐N Heterojunction Photodetectors with High Responsivity

Design of Double-Shelled CuS Nanocages to Optimize Electrocatalytic Dynamic for Sensitive Detection of Ascorbic Acid

CuS Nanosheet Arrays for Electrochemical CO2 Reduction with Surface Reconstruction and the Effect on Selective Formation of Formate

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Product

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Salt‐Assisted Growth of P‐type Cu₉S₅ Nanoflakes for P‐N Heterojunction Photodetectors with High Responsivity

Salt‐Assisted Growth of P‐type Cu₉S₅ Nanoflakes for P‐N Heterojunction Photodetectors with High Responsivity

CuS Nanosheet Arrays for Electrochemical CO₂ Reduction with Surface Reconstruction and the Effect on Selective Formation of Formate