Carbon quantum dots implanted sulfonated 2D-MoS2 for hydrogen evolution

Sarkar, Akash and Ganesh, Gayathry and Qamar, Ummiya and Singh, Vivek Kumar and Sharma, Ruchi and Srivastava, Ankur and Venugopal, Gunasekaran and Rajan, Jose and Das, Santanu (2025) Carbon quantum dots implanted sulfonated 2D-MoS2 for hydrogen evolution. Applied Surface Science, 702 (163315). pp. 1-7. ISSN 0169-4332. (Published)

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Abstract

We report the enhancement of electrocatalytic activity in sulfonate (− SO3H) group functionalized two-dimensional molybdenum disulfide (2D-s-MoS2) nanosheets for their use in hydrogen evolution reaction (HER). These as-developed nanosheets have been decorated with sustainable biomass-derived carbon quantum dots (CQDs) via a sonochemical method, creating a s-MoS2-CQD composite material. This innovative composite demonstrates significantly improved electrocatalytic performance for the hydrogen evolution reaction (HER) via water splitting. In particular, incorporating CQDs on 2D-s-MoS2 overcomes many limitations, as observed in pristine 2D-MoS2 and 2D-s-MoS2, especially regarding low electrical conductivity and restricted electrocatalytic activity on the basal plane. Incorporating CQDs enhances electron transfer efficiency, increases the availability of active sites, and enhances overall conductivity. As a result, the s-MoS2-CQD achieves remarkable HER performance, featuring a lower overpotential of ~ 273 mV and a reduced Tafel slope of 67 mV/dec compared to s-MoS2. These enhancements signify faster reaction kinetics, accelerated H* adsorption–desorption, and greater catalytic efficiency. Furthermore, using sustainably synthesized CQDs positions this approach as a cost-effective, scalable, and environmentally friendly alternative to traditional noble-metal catalysts. This research highlights the potential of functionalized twodimensional materials, such as s-MoS2, implanted with zero-dimensional materials, such as CQDs, to advance sustainable hydrogen production technologies, thereby contributing to the global shift towards clean energy solutions.

Item Type:	Article
Additional Information:	Indexed by Scopus
Uncontrolled Keywords:	Carbon Quantum Dots; Layered semiconductors; Nanoclay; Nanocrystals; Nanosheets
Subjects:	Q Science > QD Chemistry T Technology > TA Engineering (General). Civil engineering (General) T Technology > TP Chemical technology
Faculty/Division:	Faculty of Industrial Sciences And Technology Institute of Postgraduate Studies
Depositing User:	Mrs. Nurul Hamira Abd Razak
Date Deposited:	16 Jun 2025 04:02
Last Modified:	16 Jun 2025 04:02
URI:	http://umpir.ump.edu.my/id/eprint/44820
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