Journal of Nanomaterials & Molecular NanotechnologyISSN: 2324-8777

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Research Article, J Nanomater Mol Nanotechnol Vol: 6 Issue: 1

MoS2 Nanoplatelet Arrays as a Support for Decoration with Pt Nanoparticles and its Effect on Electrochemical Water Splitting

Arnas Naujokaitis1,2, Rokas Žalnėravičius1 Kęstutis Arlauskas2, Vidas Pakštas1 and Arunas Jagminas1*
1State Research Institute Centre for Physical Sciences and Technology, Sauletekio ave. 3, LT-10222 Vilnius, Lithuania
2Vilnius University, Faculty of Physics, Sauletekio ave. 9, LT-10222 Vilnius, Lithuania
Corresponding author : Arunas Jagminas
State Research Institute Centre for Physical Sciences and Technology, Sauletekio ave. 3, LT-10222 Vilnius, Lithuania
Tel:
+370 52648891
E-mail: [email protected] [email protected]
Received: October 31 2016 Accepted: January 02, 2017 Published: January 07, 2017
Citation: Naujokaitis A, Žalnėravičius R, Arlauskas K, Pakštas V, Jagminas A (2017) MoS2 Nanoplatelet Arrays as a Support for Decoration with Pt Nanoparticles and its Effect on Electrochemical Water Splitting. J Nanomater Mol Nanotechnol 6:1. doi: 10.4172/2324-8777.1000208

Abstract

MoS2 Nanoplatelet Arrays as a Support for Decoration with Pt Nanoparticles and its Effect on Electrochemical Water Splitting

Developing an active electro catalyst for water splitting remains one of the key tasks for further progress of this technology. In this study, the surprising enhancement of HER performance was obtained at Ti substrate covered by few-layered nanoplatelet molybdenum sulphides/oxides mixture array fabricated via hydrothermal synthesis and subsequent electrochemical decoration with ultra-small Pt nanoparticles. By this way, the enhancement of HER efficiency up to 10 times and more was observed, achieving the performance of HER characteristic to Pt surface. To disclose the transformations carried out during prolonged and intensive hydrogen evolution at the constructed electrodes, scanning electron microscopy (SEM) and high resolution SEM (HRSEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and cyclic voltammetry investigations were performed. The results obtained were attributed to the creation of numerous extremely active catalytic sites along the nanoplatelet edges and on their surface throughout the desulfurization by a stream of evolved hydrogen and deposition of Pt/PtO nanoparticles. Surprising ultra-high catalytic efficiency of HER with an overpotential of few mV and current density exceeding 190 mA cm-2 at -200 mV vs RHE bias voltage was obtained using just 6.0 mg m-2 Pt loading.

Keywords: Molybdenum disulfide; Hydrogen evolution reaction; Desulfurization; Heterostructured film; Platinum nanoparticles

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