A Novel Non-Metallic Photocatalyst: Phosphorus-Doped Sulfur Quantum Dots

Liu, Ziyi; Shan, Chuanfu; Ru-liang, Zhou; Wen, Jianfeng; Jiang, Li; Hu, Guanghui; Fang, Zhijie; Tang, Tao; Li, Ming

doi:10.3390/molecules28083637

“…SQDs were synthesized using a hydrothermal method [ 40 ]. First, 1.6 g of S, 3 g of PEG, 4 g of NaOH, and 100 mL of deionized water were stirred at 90 °C for 10 h. After cooling to room temperature, impurities were removed using a 0.22 µm pore size membrane.…”

Section: Methodsmentioning

confidence: 99%

“…Cyclic voltammetry (CV) was executed over 200 cycles using a scan rate of 50 mV s −1 within the non-Faraday reaction voltage range, resulting in the acquisition of consistent CV curves. The scanning range of electrochemical double layer capacitance (C dl ) was 0.15 to 0.25 V at various scanning rates (20,40,60,80, and 100 mV s −1 ). Linear scanning voltammetry (LSV) was conducted with a scan rate of 1 mV s −1 over a voltage window from −0.6 to 0.1 V. Electrochemical impedance spectroscopy (EIS) measurements were conducted over a frequency interval from 0.01 Hz to 100 kHz with an amplitude of 5 mV.…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

Synthesis and Electrocatalytic Performance Study of Sulfur Quantum Dots Modified MoS2

Wei,

Tang,

Xu

et al. 2024

Molecules

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The electrolysis of water for hydrogen production is currently receiving significant attention due to its advantageous features such as non-toxicity, safety, and environmental friendliness. This is especially crucial considering the urgent need for clean energy. However, the current method of electrolyzing water to produce hydrogen largely relies on expensive metal catalysts, significantly increasing the costs associated with its development. Molybdenum disulfide (MoS2) is considered the most promising alternative to platinum for electrocatalyzing the hydrogen evolution reaction (HER) due to its outstanding catalytic efficiency and robust stability. However, the practical application of this material is hindered by its low conductivity and limited exposure of active sites. MoS2/SQDs composite materials were synthesized using a hydrothermal technique to deposit SQDs onto MoS2. These composite materials were subsequently employed as catalysts for the HER. Research findings indicate that incorporating SQDs can enhance electron transfer rates and increase the active surface area of MoS2, which is crucial for achieving outstanding catalytic performance in the HER. The MoS2/SQDs electrocatalyst exhibits outstanding performance in the HER when tested in a 0.5 M H2SO4 solution. It achieves a remarkably low overpotential of 204 mV and a Tafel slope of 65.82 mV dec−1 at a current density of 10 mA cm−2. Moreover, during continuous operation for 24 h, the initial current density experiences only a 17% reduction, indicating high stability. This study aims to develop an efficient and cost-effective electrocatalyst for water electrolysis. Additionally, it proposes a novel design strategy that uses SQDs as co-catalysts to enhance charge transfer in nanocomposites.

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Towards Efficient White‐light Emission in Sulfur Dots through Surface Charge Engineering

Wang,

Jin

et al. 2024

Angewandte Chemie

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Sulfur dots (SDs) have emerged as promising photoluminescence (PL) materials owing to their intrinsic merits such as abundant electronic effects, outstanding biocompatibility and available photocatalytic activity. Typically based on quantum confinement effects, SDs are reported usually confined emission in blue‐to‐green region. However, it is challenging to achieve their broad emission tunability in the visible region, restricted by inherent band gap of bulk sulfur (ca. 2.79 eV). Herein, we present white‐light‐emitting SDs achieved by surface charge engineering that hybridizes the surface of SDs with oleylamine. The resulting SDs exhibit broadband emissions (full width at half maximum of 187 nm) with PL quantum yields of up to 12.1% and Commission International de I’Eclairage color coordinates of (0.27, 0.32). Detailed experimental and calculation results reveal that the strong orbital coupling between oleylamine and sulfur on the hybrid surfaces of the SDs causes electron delocalization, leading to the generation of low‐energy charge transfer (CT) states. These CT states are highly sensitive to sulfur‐oleylamine hybrid structures, which complicate the transition dynamics and promote multi‐energy emission, accounting for efficient white‐light emission. The demonstration of white‐light SDs based on surface charge engineering is an important step towards the development of sulfur‐based PL materials.

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Towards Efficient White‐light Emission in Sulfur Dots through Surface Charge Engineering

Wang,

Jin

et al. 2024

Angew Chem Int Ed

0

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Sulfur dots (SDs) have emerged as promising photoluminescence (PL) materials owing to their intrinsic merits such as abundant electronic effects, outstanding biocompatibility and available photocatalytic activity. Typically based on quantum confinement effects, SDs are reported usually confined emission in blue‐to‐green region. However, it is challenging to achieve their broad emission tunability in the visible region, restricted by inherent band gap of bulk sulfur (ca. 2.79 eV). Herein, we present white‐light‐emitting SDs achieved by surface charge engineering that hybridizes the surface of SDs with oleylamine. The resulting SDs exhibit broadband emissions (full width at half maximum of 187 nm) with PL quantum yields of up to 12.1% and Commission International de I’Eclairage color coordinates of (0.27, 0.32). Detailed experimental and calculation results reveal that the strong orbital coupling between oleylamine and sulfur on the hybrid surfaces of the SDs causes electron delocalization, leading to the generation of low‐energy charge transfer (CT) states. These CT states are highly sensitive to sulfur‐oleylamine hybrid structures, which complicate the transition dynamics and promote multi‐energy emission, accounting for efficient white‐light emission. The demonstration of white‐light SDs based on surface charge engineering is an important step towards the development of sulfur‐based PL materials.

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A Novel Non-Metallic Photocatalyst: Phosphorus-Doped Sulfur Quantum Dots

Cited by 5 publications

References 44 publications

Synthesis and Electrocatalytic Performance Study of Sulfur Quantum Dots Modified MoS2

Synthesis and Electrocatalytic Performance Study of Sulfur Quantum Dots Modified MoS2

Towards Efficient White‐light Emission in Sulfur Dots through Surface Charge Engineering

Towards Efficient White‐light Emission in Sulfur Dots through Surface Charge Engineering

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