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An advanced PdNPs@MoS2 nanocomposite for efficient oxygen evolution reaction in alkaline media†
Umair Aftab,Muhammad Yameen Solangi,Aneela Tahira,Abdul Hanan,Muhammad Ishaq Abro,Amal Karsy,Elmuez Dawi,Muhammad Ali Bhatti,Riyadh H. Alshammari,Ayman Nafady,Alessandro Gradone,Vittorio Morandi,Antonia Infantes-Molina,Zafar Hussain Ibupoto
RSC Advances Pub Date : 11/03/2023 00:00:00 , DOI:10.1039/D3RA04738E
Abstract

In response to the increasing availability of hydrogen energy and renewable energy sources, molybdenum disulfide (MoS2)-based electrocatalysts are becoming increasingly important for efficient electrochemical water splitting. This study involves the incorporation of palladium nanoparticles (PdNPs) into hydrothermally grown MoS2 via a UV light assisted process to afford PdNPs@MoS2 as an alternative electrocatalyst for efficient energy storage and conversion. Various analytical techniques, including scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and energy dispersive spectroscopy (EDS), were used to investigate the morphology, crystal quality, and chemical composition of the samples. Although PdNPs did not alter the MoS2 morphology, oxygen evolution reaction (OER) activity was driven at considerable overpotential. When electrochemical water splitting was performed in 1.0 M KOH aqueous solution with PdNPs@MoS2 (sample-2), an overpotential of 253 mV was observed. Furthermore, OER performance was highly favorable through rapid reaction kinetics and a low Tafel slope of 59 mV dec−1, as well as high durability and stability. In accordance with the electrochemical results, sample-2 showed also a lower charge transfer resistance, which again provided evidence of OER activity. The enhanced OER activity was attributed to a number of factors, including structural, surface chemical compositions, and synergistic effects between MoS2 and PdNPs.

Graphical abstract: An advanced PdNPs@MoS2 nanocomposite for efficient oxygen evolution reaction in alkaline media
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