Unknown

Dataset Information

0

Highly defective graphene quantum dots-doped 1T/2H-MoS2 as an efficient composite catalyst for the hydrogen evolution reaction.


ABSTRACT: We present a new composite catalyst system of highly defective graphene quantum dots (HDGQDs)-doped 1T/2H-MoS2 for efficient hydrogen evolution reactions (HER). The high electrocatalytic activity, represented by an overpotential of 136.9 mV and a Tafel slope of 57.1 mV/decade, is due to improved conductivity, a larger number of active sites in 1T-MoS2 compared to that in 2H-MoS2, and additional defects introduced by HDGQDs. High-resolution transmission electron microscopy (HRTEM), Raman spectroscopy, x-ray diffraction (XRD) and x-ray photoelectron spectroscopy (XPS) were used to characterize both the 1T/2H-MoS2 and GQDs components while Fourier-transform infrared spectroscopy (FTIR) was employed to identify the functional groups on the edge and defect sites in the HDGQDs. The morphology of the composite catalyst was also examined by field emission scanning electron microscopy (FESEM). All experimental data demonstrated that each component contributes unique advantages that synergistically lead to the significantly improved electrocatalytic activity for HER in the composite catalyst system.

SUBMITTER: Chen SF 

PROVIDER: S-EPMC10499812 | biostudies-literature | 2023 Sep

REPOSITORIES: biostudies-literature

altmetric image

Publications

Highly defective graphene quantum dots-doped 1T/2H-MoS<sub>2</sub> as an efficient composite catalyst for the hydrogen evolution reaction.

Chen Sheng-Fu SF   Wu Tai-Sing TS   Soo Yun-Liang YL  

Scientific reports 20230913 1


We present a new composite catalyst system of highly defective graphene quantum dots (HDGQDs)-doped 1T/2H-MoS<sub>2</sub> for efficient hydrogen evolution reactions (HER). The high electrocatalytic activity, represented by an overpotential of 136.9 mV and a Tafel slope of 57.1 mV/decade, is due to improved conductivity, a larger number of active sites in 1T-MoS<sub>2</sub> compared to that in 2H-MoS<sub>2</sub>, and additional defects introduced by HDGQDs. High-resolution transmission electron m  ...[more]

Similar Datasets

| S-EPMC10267775 | biostudies-literature
| S-EPMC9083085 | biostudies-literature
| S-EPMC11293367 | biostudies-literature
| S-EPMC5388844 | biostudies-literature
| S-EPMC11405757 | biostudies-literature
| S-EPMC10254472 | biostudies-literature
| S-EPMC5390276 | biostudies-literature
| S-EPMC8697336 | biostudies-literature
| S-EPMC10825931 | biostudies-literature
| S-EPMC10062033 | biostudies-literature