The Role of Solvent in Carbon Quantum Dot Synthesis on the Performance of MoS₂ Nanosheet/Carbon Quantum Dot Heterostructures as Electrocatalysts for the Hydrogen Evolution Reaction

ACS Applied Nano Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 10, 2025

This study investigates the effect of different solvents used in synthesis carbon quantum dots (CQDs) on electrocatalytic performance MoS2/CQD heterostructures for hydrogen evolution reaction (HER). While previous research focused CQDs synthesized with deionized water, little attention has been given to influence other CQD behavior. To address this, we MoS2 3D cloths via a hydrothermal method and subsequently incorporated using glycerol, dimethylformamide (DMF). The choice solvent significantly impacts their morphology, crystallinity, surface, electrochemical properties. In particular, nanosheets became smaller increased disordered structures defect sites, particularly sulfur vacancies. Among heterostructures, MoS2/CQDs-Glycerol showed superior performance, an onset overpotential 130 mV Tafel slope 53 mV/dec at 10 mA/cm2, outperforming MoS2/CQDs-DI (149 mV, 68 mV/dec) MoS2/CQDs-DMF (185 106 mV/dec). enhanced is attributed its larger active surface area (Cdl 228.7 mF/cm2) lower charge transfer resistance (Rct 2.25 Ω), which may be due formation more Mo–S edges vertical plane, serving as sites. demonstrates that glycerol most effective enhancing HER by improving properties, transfer.

Language: Английский

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Deep Eutectic Solvent-Assisted Hydrothermal Synthesis of Cu/Cl-Doped TiO₂ Photocatalyst for Hydrogen Production

Journal of Alloys and Compounds, Journal Year: 2024, Volume and Issue: unknown, P. 178009 - 178009

Published: Dec. 1, 2024

Language: Английский

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The Construction of Face-to-Face Combination between NiFe-layered Double Hydroxide Nanosheets and Monolayer rGO for Efficient Water Splitting and Oxygen Reduction

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(42), P. 57017 - 57031

Published: Oct. 9, 2024

Developing cost-effective and efficient electrocatalysts is essential for advancing a green energy future. Herein, NiFe-layered double hydroxide loaded on reduced graphene oxide (NiFe-LDHs@rGO) hybrid was synthesized using straightforward three-step process involving exfoliation tearing, electrostatic self-assembly, chemical reduction. The face-to-face packing ultrathin enable strong heterogeneous interactions, fully harnessing the potential of these complementary two-dimensional counterparts. Consequently, resultant catalyst displays outstanding oxygen evolution reaction (OER) catalytic activity stability, whose overpotential as low 241 mV at 30 mA cm–2 255 50 with Tafel slope 62.1 dec–1. Both experimental results density functional theory (DFT) calculations reveal that assembly strengthens electronic interactions between NiFe-LDHs rGO, which effectively modulates d-band center Ni Fesites improves kinetics OER. Moreover, NiFe-LDHs@rGO hybrids exhibit excellent multifunctional performance. Its hydrogen (HER) endowed by Fe-site defect states rGO achieves voltage 1.68 V to drive current 10 overall water splitting. heteroassembly also imparts superior reduction (ORR) activity, half-wave 0.70 limiting 4.2 cm–2. ORR primarily follows four-electron transfer pathway minor contribution from two-electron process. This study establishes groundwork optimizing interfaces in LDH@carbon-based materials advanced conversion.

Language: Английский

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Emphasis on the transition metal sulfides and their polymer composites as potential electrodes for supercapacitor applications

Journal of Energy Storage, Journal Year: 2024, Volume and Issue: 103, P. 114312 - 114312

Published: Nov. 12, 2024

Language: Английский

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